HomeMy WebLinkAboutApn I1 - Water QualityAPPENDIX I1
Water Quality Report
H.E. Job No. 08020
Preliminary Water Quality Technical Report
Otay Ranch
Village 8 West
Chula Vista Tract No. 09-XX
John A. Hayes, P.E.
R.C.E. # 58003
Expiration Date: June 30, 2014
Prepared By
Hale Engineering
7910 Convoy Court
San Diego, CA 92111
(858) 715-1420
Prepared For
Otay Land Company, LLC
1903 Wright Place, Suite 220
Carlsbad, CA 92008
(760) 602-3777
Date: December 8, 2011
i H.E. Job No. 08020
Table of Contents
1 Project Description ......................................................................................... 1
2 Priority Project Determination ......................................................................... 1
2.1 Storm Water Quality Information ........................................................... 2
2.1.1 Topography & Soils .................................................................. 2
2.1.2 Land Use .................................................................................. 2
2.1.3 Existing and Proposed Project Hydrology ................................. 3
2.1.4 Receiving Waters ...................................................................... 6
2.1.5 303(d) Impairments ................................................................... 7
3 Watershed ...................................................................................................... 7
3.1 Beneficial Uses of Receiving Waters .................................................... 7
4 Pollutants and Conditions of Concern.......................................................... 10
4.1 Backbone Infrastructure ...................................................................... 11
4.2 Town Center, Residential, Parks and Schools .................................... 13
5 Post Construction BMPs .............................................................................. 15
5.1 Backbone Infrastructure ...................................................................... 16
5.2 Town Center, Residential, Parks and Schools .................................... 18
5.3 LID and Site Design BMPs for Backbone Infrastructure ..................... 20
5.4 Source Control BMPs for Backbone Infrastructure ............................. 22
5.5 Treatment Control BMPs for Backbone Infrastructure ........................ 23
5.5.1 Structural BMP Selection........................................................ 23
5.5.2 Structural BMP Locations ....................................................... 24
5.5.3 Restrictions on the Use of Infiltration BMPs ............................ 24
5.5.4 Design Criteria and Numeric Sizing........................................ 24
6 Maintenance ................................................................................................. 25
6.1 Annual Maintenance Costs ................................................................. 25
6.2 Maintenance Mechanisms .................................................................. 26
6.3 Maintenance Requirements ................................................................ 26
6.4 Fiscal Resources ................................................................................ 27
7 Geotechnical/Soils Report ............................................................................ 28
8 Construction Activity BMPs .......................................................................... 29
9 Hydromodification ........................................................................................ 29
ii H.E. Job No. 08020
Tables
Table 2.1.3.1 Otay River Hydrologic Data……………………………………………………5
Table 2.1.3.2 Wolf Canyon Hydrologic Data…………………………………………………5
Table 2.1.3.3 Wolf Canyon Hydromodification Data………………………………………...6
Table 2.1.4.1 Project Receiving Waters………………………………………………………6
Table 3.0.1 Proportion of Watershed Area…………………………………………………7
Table 3.1.1 Beneficial Uses of Inland Receiving Waters…………………..…………….10
Table 3.1.2 Beneficial Uses of Ground Receiving Waters……………………………….10
Table 3.1.3 Beneficial Uses of Coastal Receiving Waters……………………………….10
Table 4.1.1 Anticipated and Potential Pollutants………………………………………….11
Table 4.2.1 Anticipated and Potential Pollutants………………………………………….13
Table 5.1.1 Site Design and Source Control Storm Water BMP Selection Matrix…….16
Table 5.1.2 Pollutants of Concern Response to Treatment…………………………….. 17
Table 5.1.3 Treatment Control BMP Selection Matrix……………………………………17
Table 5.2.1 Site Design and Source Control Storm Water BMP Selection Matrix…….17
Table 5.2.2 Pollutants of Concern Response to Treatment……………………………..19
Table 5.2.3 Treatment Control BMP Selection Matrix……………………………………19
Table 6.1.1 Estimated O&M Costs for Structural BMPs Within the Right-of-Way…….25
Table 6.1.2 Estimated O&M Costs for Public Facilities……………………………….....25
Table 6.1.3 Estimated O&M Costs for Private Structural Facilities……………………..25
Table 6.2.1 BMP Maintenance Mechanisms……………………………………………...26
Appendices
Appendix A Vicinity Map
Appendix B Project BMP Plan
Appendix C DMA Calculations
Appendix D Storm Water Management Facilities Maintenance Agreement With
Grant of Access and Covenants Template
Appendix E Geotechnical Investigation
Appendix F Inspection, Operation, and Maintenance Plan
1H.E. Job No. 08020
1 Project Description
The project site is a 320-acre (gross) parcel located within the City of Chula
Vista. The property has been assigned assessor’s parcel number 644-070-12
and 644-070-14 and can be found on page 1331 E4 of the 2007 edition of the
Thomas Guide to San Diego.
The project is referred to as Village 8 West of the Otay Ranch Land Use Plan. At
this time, the proposed site development includes the construction of backbone
roadways, infrastructure (including storm drain and utilities), the mass grading of
pads for future development, and the construction of an off-site utility access
roadway. This WQTR shall identify both the water quality concerns due to the
backbone infrastructure and roadways as currently proposed and those due to
future development. Where stub outs for future improvements are proposed,
temporary erosion control measures will be implemented. The measures taken to
preserve water quality shall meet all State and City agency standards for the
treatment of urban runoff.
The future development includes service and mixed retail within the proposed
Town Center, residential (attached and detached), schools and parks. Typical
anticipated pollutants from such developments are identified in Section 4.2 and
appropriate BMP measures are described in Section 5.2. As detailed site plans
are not available at this time, developers for each planning area associated with
the Village 8 SPA Plan will be required to submit for City review and approval
site-specific Water Quality Technical Reports prior to obtaining any land
development permits. Individual developers will also be responsible for
implementing and maintaining all BMPs until new owners take responsibility for
the maintenance of post-construction BMPs into perpetuity. The measures taken
to preserve water quality of the future development shall meet all State and City
agency standards for the treatment of urban runoff.
2 Priority Project Determination
The proposed project includes backbone infrastructure (roadways and utilities)
for Village 8 West. Per Section 3.I of the City of Chula Vista’s Development
Storm Water Manual (January 2011), the project meets the definition of the
following Priority Development Project classification: Streets, Highways, and
Freeways.
Future development of the project includes service and mixed retail within the
proposed Town Center, residential (attached and detached), schools and parks.
Per Section 3.I of the City of Chula Vista’s Development Storm Water Manual,
the future development meets the definition of the following Priority Development
Project classifications: Detached Residential Development, Attached Residential
Development; Restaurants, Hillside Development and Parking Lots.
2H.E. Job No. 08020
2.1 Storm Water Quality Information
2.1.1 Topography & Soils
The property consists of two topographic regimes. The northern and eastern
portions of the property are underlain by the Otay Formation and are
characterized by rolling hills punctuated by south draining "V" shaped drainages.
Locally, along incised flow-lines, gradients on the order of 1:5:1 (horizontal to
vertical) or steeper exist. However, most of the drainages are broad and
relatively shallow. This regime terminates to the south in low-relief river terraces
bordering the Otay River. The southwestern portion of the site (approximately
37.3 acres), comprising the second topographic regime, consists of boulders and
more rugged terrain underlain by the Santiago Peak Volcanics. Relief over the
volcanic area, referred to as Rock Mountain, is greater than 300 feet and slopes
are estimated at greater than 25%. The southerly extension of the 30-foot utility
access road extends through approximately 4,000 feet of relatively level Terrace
deposits before dropping into the alluviated Otay River drainage.
Per the site reconnaissance and subsurface investigation conducted by
Advanced Geotechnical Services, INC. (AGS) no indications of mass wasting
were observed nor mapped within the Santiago Peak Volcanics. Relatively
stable, steep slopes and the absence of mass wasting are common within this
unit. The pervasive Otay Formation is less resistant to erosion and slumping.
Surficial slumps and deeper landslides do occur regionally, and are often
associated with the La Nacion fault and/or bentonite beds are exposed by
erosion and baseline down cutting. However, no significant landslides were
identified during the site reconnaissance and subsurface investigation conducted
by Advanced Geotechnical Services, INC.
For further information, please see Appendix E Geotechnical Investigation.
2.1.2 Land Use
Currently, the site is used for light agrarian (dry farming) purposes. An existing
City of San Diego reservoir occupies a central portion of the property. Reservoir-
associated large diameter aqueducts forming the Coronado Wye traverse the
site. The MSCP Subarea Plan Preserve occupies approximately 16 acres in the
southwest corner of the project site. Under the proposed project, the site will be
developed per the Otay Ranch Land Use plan as Village 8 West. The site will
contain the existing reservoir, mass graded pads, infrastructure, major roadways,
and a utility access road that extends from southwest corner of the project into
the MSCP. The large diameter aqueducts will be relocated and the associated
City of San Diego waterline easement vacated.
Future development of the project site includes service and mixed retail within
the proposed Town Center, residential (attached and detached), schools and
parks.
3H.E. Job No. 08020
2.1.3 Existing and Proposed Project Hydrology
In the existing condition, the site is composed of 3 drainage areas with three
distinct discharge points. Drainage areas A and B drain southwesterly toward two
outlet points along the southern boundary of the project; drainage area C drains
westerly toward an outlet point along the western boundary of the project.
Pre-Project Drainage Area A is an 83.9-acre drainage area with a high point of
511.7 and a flow line elevation of 310.0 at the outlet point. Flow through the
drainage area consists of natural mountain channel flow. The flow path from the
highest point in the basin to the lowest is 4,340 feet. This flow exits the project
limits at the MSCP boundary and continues s’ly along the natural channel to Otay
River.
Pre-Project Drainage Area B is a 127.1-acre drainage area with a high point of
514.4 and a flow line elevation of 276.7 at the outlet point. This basin receives
offsite flow from Village 7 Vista Verde; quantities are determined in the drainage
study prepared by Rick Engineering. Flow through the drainage area consists of
natural mountain channel flow. The flow path from the highest point in the basin
to the lowest is 4,375 feet. This flow exits the project boundary and continues s’ly
along the natural channel to Otay River.
Pre-Project Drainage Area C is a 183.6-acre drainage area composed of 89.6
acres of offsite flow and 94.0 acres of onsite flow; with a high point of 430.0 and
a flow line elevation of 367.1 at the outlet point. This basin receives offsite flow
from Otay Ranch Village 7; quantities are determined in the hydrology study
prepared by Hunsaker Engineering. Flow through the drainage area consists of
natural mountain channel flow. The flow path from the highest point in the basin
to the lowest is 3,100 feet. This flow exits the project boundary and continues
sw’ly along the natural channel to Wolf Creek which is tributary to Otay River.
In the post-project condition, the site is comprised of 5 drainage areas. Drainage
areas 1, 2 and 3 drain southerly toward the Otay River; drainage areas 4 and 5
drain westerly to Wolf Canyon.
Post-Project Drainage Area 1 is a 36.7-acre drainage area; proposed
improvements within this drainage area include mass grading of pads and
portions of Streets 'D', ‘E’, ‘H’, ‘I’, & ‘K’ within Parcel P for future development.
Runoff is transported to the proposed storm drain system via proposed catch
basins and curb inlets located at intervals within the proposed roadways. This
storm drain system ultimately confluences with areas 2 & 3 and conveys s’ly
through storm drain to the Otay River.
Post-Project Drainage Area 2 is a 42.3-acre drainage area; proposed
improvements within this area include mass grading of pads and portions of
Streets ‘E’, ‘M’, & ‘L’ within Parcels T, U, & V for future development. Runoff is
transported to the proposed storm drain system via proposed curb inlet located at
intervals within the drainage area. This storm drain ultimately confluences with
4H.E. Job No. 08020
area 1 and conveys s’ly through storm drain to the outlet point and continuing to
the Otay River.
Post-Project Drainage Area 3 is a 100.3-acre drainage area composed of 20.1
acres of offsite flow and 82.7 acres of onsite flow. A south east segment of Otay
Valley Road discharges to the east .Proposed improvements within this area
include mass grading of pads and portions of Streets ‘A’, ‘B’, & La Media within
Parcels M, O, Q, R, S, & the reservoir for future development. This basin
receives offsite flow from Village 7 Vista Verde; quantities are determined in the
drainage study prepared by Rick Engineering. Runoff is transported to the
proposed storm drain system via proposed curb inlet located at intervals within
the proposed roadways. This storm drain ultimately confluences with area 1 and
conveys s’ly through storm drain to the outlet point and continuing to the Otay
River. Velocity for the 3 drainage areas is dissipated with a USBR type VI impact
basin and 20’ rip rap energy dissipator.
Otay Valley Road – The section of road east of Street A does not combine with
Drainage areas 1 – 3.
Post-Project Drainage Area 4 is a 143.6-acre drainage area composed of 89.6
acres of offsite flow and 54.0 acres of onsite flow; proposed improvements within
this drainage area include mass grading of pads & portions of La Media Road,
Street 'A', and Main Street within parcels B, C, D, E, F, G (portion), H (portion),
and W for future development. This basin receives offsite flow from Otay Ranch
Village 7; quantities are determined in the hydrology study prepared by Hunsaker
Engineering. Runoff is transported to the proposed storm drain system via
proposed catch basins and curb inlets located at intervals within the proposed
roadways. This storm drain system confluences with area 5 and ultimately outlets
to an existing natural drainage channel after discharging from a detention basin
designed to manage development hydromodification. This discharge confluences
drainage areas 4 & 5 with the City of Chula Vista property Basin P (a park to be
developed by the city and not included in the hydromodification design).
Discharge outlets through energy dissipaters (impact basin and rip rap) and flows
westerly from the outlet point to Wolf Canyon.
Post-Project Drainage Area 5 is a 59.0-acre drainage area; proposed
improvements within this drainage area include mass grading of pads & portions
of La Media Road, Main Street, and Streets 'A', ‘D’, ‘F’, & ‘G’, and within parcels
G (portion), H (portion), I, J, L, & N for future development. Runoff is transported
to the proposed storm drain system via proposed catch basins and curb inlets
located at intervals within the proposed roadways. This storm drain system
confluences with area 4 and Basin P and ultimately outlets to an existing natural
drainage channel running westerly from the outlet point to Wolf Canyon.
5H.E. Job No. 08020
The following table lists the Pre- and Post-Project Hydrology data for the Otay
River discharge as determined per the County of San Diego Hydrology Manual
Methodology.
Table 2.1.3.1 Otay River Hydrologic Data
Otay River
Pre Project
Qe
Post Project
Qp
Tributary Basins AB A+B 1-3
Area (acres) 83.9 127.1 211.0 179.3
2-Year
Storm
Q (cfs)47.8 70.8 118.6 155.5
Tc (min)18.1 30.6 22.2
10-Year
Storm
Q (cfs)78.7 112.5 191.2 243.9
Tc (min)16.4 28.6 21.5
25-Year
Storm
Q (cfs)84.0 119.5 203.5 258.7
Tc (min)16.2 28.4 21.4
50-Year
Storm
Q (cfs)105.7 147.7 253.4 317.9
Tc (min)15.5 27.6 21.2
100-Year
Storm
Q (cfs)122.3 169.1 291.4 362.5
Tc (min)15.0 27.1 21.0
The following table lists the Pre- and Post-Project Hydrology data for the Wolf
Canyon discharge point as determined per the County of San Diego Hydrology
Manual Methodology.
Table 2.1.3.2 Wolf Canyon Hydrologic Data
Wolf Canyon
Pre ProjectPost Project
Qe
Flow Into
Detention
Basin
Qp
Flow
Out of
Detention
Basin
Qm
Lot ‘A’
Qp
Total
Qt
Tributary Basins C 4,5 4,5 Lot ‘A’
Area (acres) 183.6 202.6 202.6 16.3
2-Year
Storm
Q (cfs)155.6 243.8 42.6 18.4 61.0
Tc (min)15.4 13.8
10-Year
Storm
Q (cfs)246.0 380.1 136.4 28.7 165.1
Tc (min)14.9 13.6
25-Year
Storm
Q (cfs)261.2 402.8 157.2 30.5 187.7
Tc (min)14.8 13.5
50-Year
Storm
Q (cfs)322.3 493.8 241.2 37.4 278.6
Tc (min)14.6 13.5
100-Year
Storm
Q (cfs)368.3 559.3 313.4 42.4 355.8
Tc (min)14.5 13.5
6H.E. Job No. 08020
Note, the detention basin design located within Lot ‘W’ is based upon the more
conservative values calculated via the HMP methodology.
The following table lists the Pre- and Post-Project Hydrology data for the Wolf
Canyon discharge point as determined by HSPF in accordance with the criteria
per the County of San Diego Final Hydromodification Management Plan (HMP).
Table 2.1.3.3 Wolf Canyon Hydromodification Data
Wolf Canyon
Pre Project
Qe
Post Project
(Mitigated)
Qm
Tributary Basins C4,5
Area (acres) 183.6202.6
2-Year Storm Q (cfs)28.6 17.1
5-Year Storm Q (cfs)39.0 31.8
10-Year Storm Q (cfs)55.6 40.1
25-Year Storm Q (cfs)93.0 63.9
As shown above, peak flows increase with urban development of the Village 8
West site. This is due to increased impervious surface areas. However, a
Hydromodification Management Plan (HMP) was prepared for the County of San
Diego, and approved on July 14, 20101. Per the Hydromodification Management
Plan Technical Advisory Committee (HMPTAC) recommendations, the HMP has
listed the Otay River Valley as a facility that is exempt from hydromodification.
Therefore, hydromodification measures are not required for those areas directly
tributary to the Otay River. Hydromodification shall be implemented for the areas
tributary to the Wolf Canyon discharge point to maintain the integrity of Wolf
Canyon.
2.1.4 Receiving Waters
The proposed project is part of the Otay Watershed, more specifically described
as the Otay Valley Hydrologic Area, basin number 910.20. The receiving waters
for the project are Wolf Canyon, the Otay River, and the San Diego Bay.
Table 2.1.4.1 Project Receiving Waters
Number Name Distance from Site
910 Wolf Canyon (Otay Valley HA) 0.4 miles
910.20 Otay River (Otay Valley HA) 0.6 miles
-NA- San Diego Bay 8.6 miles
Revised 12/8/2011
1 The Final HMP entered the implementation phase on January 14, 2011.
7H.E. Job No. 08020
2.1.5 303(d) Impairments
According to the California 2006 303(d) list, which identifies impaired and
threatened waters, published by the San Diego Regional Water Quality Control
Board (RWQCB Region 9) the San Diego Bay is impaired for PCBs (Organic
Compounds). Neither Wolf Canyon or Otay River are on the 303(d) list.
3 Watershed
The proposed project is part of the Otay River Watershed, more specifically
described as the Chula Vista Hydrologic Area, basin number 910.2. The
receiving waters for the project are the Otay River, and the San Diego Bay.
Table 3.0.1 Proportion of Watershed Area
Area
(acres)
Area as a Percentage of
Otay
Watershed
Otay Valley
Hydrologic
Area
Project
Site
Otay Watershed (910) 102,400 100 - -
Otay Valley Hydrologic Area (910.2) 29,569 28.9 100 -
Project Site 320 0.3 1.1 100
3.1 Beneficial Uses of Receiving Waters
The Porter-Cologne Act establishes a comprehensive program for the protection
of beneficial uses of the waters of the state. California Water Code Section
13050(f) describes the beneficial uses of surface and ground waters that may be
designated by the State or Regional Board for protection as follows:
“Beneficial uses of the waters of the state that may be protected against quality
degradation include, but are not necessarily limited to, domestic, municipal,
agricultural and industrial supply; power generation; recreation; aesthetic
enjoyment; navigation; and preservation and enhancement of fish, wildlife, and
other aquatic resources or preserves.”
Beneficial uses for surface waters are designated under the Clean Water Act
Section 303 in accordance with regulations contained in 40 CFR 131. The State
is required to specify appropriate water uses to be achieved and protected. The
beneficial use designation of surface waters of the state must take into
consideration the use and value of water for public water supplies, protection and
propagation of fish, shellfish and wildlife, recreation in and on the water,
agricultural, industrial and other purposes including navigation.
In 1972, the State Board adopted a uniform list and description of beneficial uses
to be applied throughout all basins of the State. During the 1994 Basin Plan
update, beneficial use definitions were revised and some new beneficial uses
were added. Overall, the following twenty-three beneficial uses are now defined
statewide and are designated within the San Diego Region:
8H.E. Job No. 08020
Municipal and Domestic Supply (MUN) - Includes uses of water for community,
military, or individual water supply systems including, but not limited to, drinking water
supply.
Agricultural Supply (AGR) -Includes uses of water for farming, horticulture, or
ranching including, but not limited to, irrigation, stock watering, or support of
vegetation for range grazing.
Industrial Process Supply (PROC) - Includes uses of water for industrial activities
that depend primarily on water quality.
Industrial Service Supply (IND) - Includes uses of water for industrial activities that
do not depend primarily on water quality including, but not limited to, mining, cooling
water supply, hydraulic conveyance, gravel washing, fire protection, or oil well re-
pressurization.
Ground Water Recharge (GWR) - Includes uses of water for natural or artificial
recharge of ground water for purposes of future extraction, maintenance of water
quality, or halting of saltwater intrusion into freshwater aquifers.
Freshwater Replenishment (FRSH) - Includes uses of water for natural or artificial
maintenance of surface water quantity or quality (e.g., salinity).
Navigation (NAV) - Includes uses of water for shipping, travel, or other transportation
by private, military, or commercial vessels.
Hydropower Generation (POW) - Includes uses of water for hydropower generation.
Contact Water Recreation (REC-1) - Includes uses of water for recreational activities
involving body contact with water, where ingestion of water is reasonably possible.
These uses include, but are not limited to, swimming, wading, water-skiing, skin and
SCUBA diving, surfing, white water activities, fishing, or use of natural hot springs.
Non-Contact Water Recreation (REC-2) - Includes the uses of water for recreational
activities involving proximity to water, but not normally involving body contact with
water, where ingestion of water is reasonably possible. These uses include, but are
not limited to, picnicking, sunbathing, hiking, beachcombing, camping, boating,
tidepool and marine life study, hunting, sightseeing, or aesthetic enjoyment in
conjunction with the above activities.
Commercial and Sport Fishing (COMM) - Includes the uses of water for commercial
or recreational collection of fish, shellfish, or other organisms including, but not limited
to, uses involving organisms intended for human consumption or bait purposes.
Aquaculture (AQUA) - Includes the uses of water for aquaculture or mariculture
operations including, but not limited to, propagation, cultivation, maintenance, or
harvesting of aquatic plants and animals for human consumption or bait purposes.
Warm Freshwater Habitat (WARM) - Includes uses of water that support warm
water ecosystems including, but not limited to, preservation or enhancement of
aquatic habitats, vegetation, fish or wildlife, including invertebrates.
9H.E. Job No. 08020
Cold Freshwater Habitat (COLD) - Includes uses of water that support cold-water
ecosystems including, but not limited to, preservation or enhancement of aquatic
habitats, vegetation, fish or wildlife, including invertebrates.
Inland Saline Water Habitat (SAL) - Includes uses of water that support inland saline
water ecosystems including, but not limited to, preservation or enhancement of
aquatic saline habitats, vegetation, fish, or wildlife, including invertebrates.
Estuarine Habitat (EST) - Includes uses of water that support estuarine ecosystems
including, but not limited to, preservation or enhancement of estuarine habitats,
vegetation, fish, shellfish, or wildlife (e.g., estuarine mammals, waterfowl, shorebirds).
Marine Habitat (MAR) - Includes uses of water that support marine ecosystems
including, but not limited to, preservation or enhancement of marine habitats,
vegetation such as kelp, fish, shellfish, or wildlife (e.g., marine mammals, shorebirds).
Wildlife Habitat (WILD) - Includes uses of water that support terrestrial ecosystems
including, but not limited to, preservation and enhancement of terrestrial habitats,
vegetation, wildlife (e.g., mammals, birds, reptiles, amphibians, invertebrates), or
wildlife water and food sources.
Preservation of Biological Habitats of Special Significance (BIOL) - Includes
uses of water that support designated areas or habitats, such as established refuges,
parks, sanctuaries, ecological reserves, or Areas of Special Biological Significance
(ASBS), where the preservation or enhancement of natural resources requires special
protection.
Water quality objectives must protect the most sensitive of the beneficial uses,
which have been designated for a water body. Water quality objectives may be
numerical values for water quality constituent or narrative descriptions. Water
quality objectives must be based upon sound scientific water quality criteria
needed to protect the most sensitive of the beneficial uses, which have been
designated for a water body. Water quality objectives must be as stringent or
more stringent than water quality criteria.
The RWQCB San Diego Basin Plan identifies several beneficial uses of receiving
waters. Tables 3.1.1and 3.1.2summarize the beneficial uses identified for
downstream receiving waters.
10H.E. Job No. 08020
Table 3.1.1 Beneficial Uses of Inland Receiving Waters
Receiving
Waters
HU/
Basin
Number MU
N
AG
R
IN
D
PR
O
C
GW
R
FR
S
H
PO
W
RE
C
1
RE
C
2
BI
O
L
WA
R
M
CO
L
D
WI
L
D
RA
R
E
SP
W
N
Otay River 910.20 +
Wolf Canyon 910.20 +
Existing Beneficial Use Potential Beneficial Use + Exempt from Municipal Use
Table 3.1.2 Beneficial Uses of Ground Receiving Waters
Receiving
Waters
HU/
Basin
Number MU
N
AG
R
IN
D
PR
O
C
GW
R
FR
S
H
Otay Valley HA 910.20
Existing Beneficial Use
Table 3.1.3 Beneficial Uses of Coastal Receiving Waters
Receiving
Waters
HU/
Basin
Number IN
D
NA
V
RE
C
1
CO
M
M
BI
O
L
ES
T
WI
L
D
RA
R
E
MA
R
AQ
U
A
MI
G
R
SP
A
W
N
WA
R
M
SH
E
L
L
San Diego Bay
Existing Beneficial Use
4 Pollutants and Conditions of Concern
Per Section 3.6.1.b of the City of Chula Vista’s Development Storm Water
Manual, pollutants generated by the proposed project that exhibit one or more of
the following characteristics are considered pollutants of concern:
Current loadings or historical deposits of the pollutant are impairing the
beneficial uses of a receiving water;
Elevated levels of the pollutant are found in water or sediments of a receiving
water and/or have the potential to be toxic to or bioaccumulate in organisms
therein; and
Inputs of the pollutants are at a level high enough to be considered potentially
toxic.
Per Section 3.6.1.b of the Development Storm Water Manual, any anticipated
pollutants to be generated by the project which also are on the 303(d) list of
impairments for the receiving waters shall be considered as pollutants of
concern.
11H.E. Job No. 08020
4.1 Backbone Infrastructure
Table 4.1.1 Anticipated and potential pollutants
Priority Project Categories
General Pollutant Categories
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s
t
i
c
i
d
e
s
Detached Residential X XXXXXX
Attached Residential XXXP(1) P(2) P X
Commercial (> 1 ac) P(1)P(1) P(2)X P(5)X P(3)P(5)
Heavy Industry/
Industrial Development XXXXXX
Auto Repair Shops X X (4) (5)XX
Restaurants XXXX
Hillside Development (>5,000 S.F.) XXXXXX
Parking Lots P(1)P(1)XXP(1)X P(1)
Retail Gasoline Outlets XXXXX
Streets, Highways, and Freeways X P(1)X X (4)X P(5)X
(1) A potential pollutant if landscaping exists on-site; (2) A potential pollutant if the project includes
uncovered parking areas; (3) A potential pollutant if land use involved food or animal waste products;
(4) Including petroleum hydrocarbons; (5) Including solvents.
X Anticipated Pollutants P Potential Pollutants
As noted in Section 2, the proposed backbone infrastructure is classified as
Streets, Highways, and Freeways. The following are the anticipated pollutants for
the site:
Sediment- Sediments are soils or other surface materials eroded and then
transported or deposited by the action of wind, water, ice, or gravity. Sediments
can increase turbidity, clog fish gills, reduce spawning habitat, lower young
aquatic organisms survival rates, smother bottom dwelling organisms, and
suppress aquatic vegetation growth.
Nutrients2-Nutrients are inorganic substances, such as nitrogen and
phosphorus. They commonly exist in the form of mineral salts that are either
dissolved or suspended in water. Primary sources of nutrients in urban runoff are
fertilizers and eroded soils. Excessive discharge of nutrients to water bodies and
streams can cause excessive aquatic algae and plant growth. Such excessive
production, referred to as cultural eutrophication, may lead to excessive decay of
organic matter in the water body, loss of oxygen in the water, release of toxins in
sediment, and the eventual death of aquatic organisms.
2 Nutrients are an anticipated pollutant due to the inclusion of landscaping in the project design.
12H.E. Job No. 08020
Heavy Metals- Metals are raw material components in non-metal products such
as fuels, adhesives, paints, and other coatings. Primary sources of metal
pollution in storm water are typically commercially available metals and metal
products. Metals of concern include cadmium, chromium, copper, lead, mercury,
and zinc. Lead and chromium have been used as corrosion inhibitors in primer
coatings and cooling tower systems. At low concentrations naturally occurring in
the soil, metals are not toxic. However, at higher concentrations, certain metals
can be toxic to aquatic life. Humans can be impacted from contaminated ground
water resources, and bioaccumulation of metals in fish and shellfish.
Environmental concerns, regarding the potential for release of metals to the
environment, have already led to restricted metal usage in certain applications.
Organic Compounds- Organic Compounds are carbon-based. Commercially
available or naturally occurring are found in pesticides, solvents, and
hydrocarbons. Organic Compounds can, at certain concentrations, indirectly or
directly constitute a hazard to life or health. When rinsing off objects, toxic levels
of solvents and cleaning compounds can be discharged to storm drains. Dirt,
grease, and grime retained in the cleaning fluid or rinse water may also absorb
levels of Organic Compounds that are harmful or hazardous to aquatic life.
Trash and Debris - Trash (such as paper, plastic, polystyrene packing foam,
and aluminum materials) and biodegradable organic matter (such as leaves,
grass cuttings, and food waste) are general waste products on the landscape.
The presence of trash and debris may have a significant impact on the
recreational value of a water body and aquatic habitat. Excess organic matter
can create a high biochemical oxygen demand in a stream and thereby lower its
water quality. In addition, in areas where stagnant water exists, the presence of
excess organic matter can promote septic conditions resulting in the growth of
undesirable organisms and the release of odorous and hazardous compounds
such as hydrogen sulfide.
Oil and Grease - Oil and grease are characterized as high-molecular weight
Organic Compounds. The primary sources of oil and grease are petroleum
hydrocarbon products, motor products from leaking vehicles, esters, oils, fats,
waxes, and high molecular-weight fatty acids. Introduction of these pollutants to
the water bodies are very possible due to the wide uses and applications of some
of these products in municipal, residential, commercial, industrial, and
construction areas. Elevated oil and grease content can decrease the aesthetic
value of the water body, as well as the water quality.
Since the 303(d) impairment of the receiving waters is PCBs (Organic
Compounds), and per Table 4.1.1 Organic Compounds is an anticipated
pollutant, Organic Compounds is a Pollutant of Concern associated with the
backbone infrastructure and requires special consideration. Storm water BMPs
are chosen that maximize removal of Organic Compounds from storm water
runoff. Storm water BMPs are also chosen such that they are consistent with the
Maximum Extent Practicable (MEP) standard for Sediments, Nutrients, Heavy
Metals, Trash & Debris, and Oil & Grease.
13H.E. Job No. 08020
4.2 Town Center (Service & Mixed Retail), Residential (attached &
detached), Parks and Schools
Table 4.2.1 Anticipated and potential pollutants
Priority Project Categories
General Pollutant Categories
Se
d
i
m
e
n
t
s
Nu
t
r
i
e
n
t
s
He
a
v
y
Me
t
a
l
s
Or
g
a
n
i
c
Co
m
p
o
u
n
d
s
Tr
a
s
h
&
De
b
r
i
s
O.
D
.
S
Oi
l
s
&
Gr
e
a
s
e
Ba
c
t
e
r
i
a
&
Vi
r
u
s
e
s
Pe
s
t
i
c
i
d
e
s
Detached Residential X X X X X X X
Attached Residential X X X P(1)P(2)P X
Commercial (> 1ac) P(1)P(1) P(2)X P(5)X P(3)P(5)
Heavy Industry/
Industrial Development XXXXXX
Auto Repair Shops X X (4) (5)XX
Restaurants X X X X
Hillside Development
(>5,000 S.F.) X X X X X X
Parking Lots P(1)P(1)X X P(1)X P(1)
Retail Gasoline Outlets X X XXX
Streets, Highways, and
Freeways X P(1)X X (4)X P(5)X
(1) A potential pollutant if landscaping exists on-site; (2) A potential pollutant if the project includes
uncovered parking areas; (3) A potential pollutant if land use involved food or animal waste
products; (4) Including petroleum hydrocarbons; (5) Including solvents.
X Anticipated Pollutants P Potential Pollutants
As noted in Section 2, the future development is classified as Detached
Residential Development, Attached Residential Development; Restaurants,
Hillside Development and Parking Lots. The following are the anticipated
pollutants for the site:
Sediment - Sediments are soils or other surface materials eroded and then
transported or deposited by the action of wind, water, ice, or gravity. Sediments
can increase turbidity, clog fish gills, reduce spawning habitat, lower young
aquatic organisms survival rates, smother bottom dwelling organisms, and
suppress aquatic vegetation growth.
Nutrients -Nutrients are inorganic substances, such as nitrogen and
phosphorus. They commonly exist in the form of mineral salts that are either
dissolved or suspended in water. Primary sources of nutrients in urban runoff are
fertilizers and eroded soils. Excessive discharge of nutrients to water bodies and
streams can cause excessive aquatic algae and plant growth. Such excessive
production, referred to as cultural eutrophication, may lead to excessive decay of
organic matter in the water body, loss of oxygen in the water, release of toxins in
sediment, and the eventual death of aquatic organisms.
14H.E. Job No. 08020
Heavy Metals- Metals are raw material components in non-metal products such
as fuels, adhesives, paints, and other coatings. Primary sources of metal
pollution in storm water are typically commercially available metals and metal
products. Metals of concern include cadmium, chromium, copper, lead, mercury,
and zinc. Lead and chromium have been used as corrosion inhibitors in primer
coatings and cooling tower systems. At low concentrations naturally occurring in
the soil, metals are not toxic. However, at higher concentrations, certain metals
can be toxic to aquatic life. Humans can be impacted from contaminated ground
water resources, and bioaccumulation of metals in fish and shellfish.
Environmental concerns, regarding the potential for release of metals to the
environment, have already led to restricted metal usage in certain applications.
Trash and Debris - Trash (such as paper, plastic, polystyrene packing foam,
and aluminum materials) and biodegradable organic matter (such as leaves,
grass cuttings, and food waste) are general waste products on the landscape.
The presence of trash and debris may have a significant impact on the
recreational value of a water body and aquatic habitat. Excess organic matter
can create a high biochemical oxygen demand in a stream and thereby lower its
water quality. In addition, in areas where stagnant water exists, the presence of
excess organic matter can promote septic conditions resulting in the growth of
undesirable organisms and the release of odorous and hazardous compounds
such as hydrogen sulfide.
Oxygen Demanding Substances – This category includes biodegradable
organic material as well as chemicals that react with dissolved oxygen in water to
form other compounds. Proteins, carbohydrates, and fats are examples of
biodegradable organic compounds. Compounds such as ammonia and
hydrogen sulfide are examples of oxygen-demanding compounds. The oxygen
demand of a substance can lead to depletion of dissolved oxygen in a water
body and possibly the development of septic conditions.
Oil and Grease - Oil and grease are characterized as high-molecular weight
Organic Compounds. The primary sources of oil and grease are petroleum
hydrocarbon products, motor products from leaking vehicles, esters, oils, fats,
waxes, and high molecular-weight fatty acids. Introduction of these pollutants to
the water bodies are very possible due to the wide uses and applications of some
of these products in municipal, residential, commercial, industrial, and
construction areas. Elevated oil and grease content can decrease the aesthetic
value of the water body, as well as the water quality.
Bacteria and Viruses – Bacteria and viruses are ubiquitous microorganisms that
thrive under certain environmental conditions. Their proliferation is typically
caused by the transport of animal or human fecal wastes from the watershed.
Water, containing excess bacteria and viruses can alter the aquatic habitat and
create a harmful environment for humans and aquatic life. Also, the
decomposition of organic waste causes increased growth of undesirable
organisms in the water.
15H.E. Job No. 08020
Pesticides – Pesticides (including herbicides) are chemical compounds
commonly used to control nuisance growth or prevalence of organisms.
Excessive application of a pesticide may result in runoff containing toxic levels of
its active component.
Since the 303(d) impairment of the receiving waters is PCBs (Organic
Compounds), and per Table 4.2.1 Organic Compounds is not an anticipated
pollutant for the future development, storm water BMPs are chosen that meet the
MEP standard for the above described pollutants.
5 Post Construction BMPs
Site Design BMPs may reduce the need for Source and/or Treatment Control
BMPs, and Source Control BMPs may reduce the amount of Treatment Control
BMPs needed. The proposed project shall consider, incorporate, and implement
storm water BMPs in the following progression:
Low Impact Development (LID) and Site Design BMPs
Source Control BMPs
Treatment BMPs
For further information see the BMP Site Map and DMA calculations included in
Appendices B and C respectively of this WQTR.
16H.E. Job No. 08020
5.1 Backbone Infrastructure
Table 5.1.1 Site Design and Source Control Storm Water BMP Selection Matrix
Priority Project
Category
Si
t
e
D
e
s
i
g
n
B
M
P
s
1
So
u
r
c
e
C
o
n
t
r
o
l
B
M
P
s
2 Requirements Applicable to
Individual Priority Project Categories(3)
a.
P
r
i
v
a
t
e
R
o
a
d
s
b.
R
e
s
i
d
e
n
t
i
a
l
Dr
i
v
e
w
a
y
s
&
G
u
e
s
t
P
a
r
k
i
n
g
c.
D
o
c
k
A
r
e
a
s
d.
M
a
i
n
t
e
n
a
n
c
e
Ba
yS
e.
V
e
h
i
c
l
e
W
a
s
h
Ar
e
a
s
f.
O
u
t
d
o
o
r
Pr
o
c
e
s
s
i
n
g A
r
e
a
s
g.
E
q
u
i
p
m
e
n
t
Wa
s
h
A
r
e
a
s
h.
P
a
r
k
i
n
g
A
r
e
a
s
i.
R
o
a
d
w
a
y
s
j.
F
u
e
l
i
n
g
A
r
e
a
s
k.
H
i
l
l
s
i
d
e
La
n
d
s
c
a
pin
g
Detached Residential
Development R R R R R
Attached Residential
Development R R R
Commercial
Development R R R R R R
Automotive Repair
Shop R R R R R R R
Restaurants R R R R
Hillside Development R R R R
Parking Lots R R R(4)
Streets, Highways &
Freeways R R R
R= Required
(1) Refer of Section 3.6.2.a of the Development Storm Water Manual
(2) Refer of Section 3.6.2.b of the Development Storm Water Manual
(3) Priority project categories must apply specific storm water BMP requirements, where applicable. Projects are
subject to the requirements of all priority project categories that apply.
(4) Applies if the paved area totals>5,000 square feet or with >15 parking spaces and is potentially exposed to
urban runoff.
Per Table 5.1.1, the proposed project shall incorporate Site Design and Source
Control BMPs as well as the requirements applicable individual priority projects
as highlighted above.
17H.E. Job No. 08020
Table 5.1.2 Pollutants of Concern Response to Treatment
Pollutant Coarse Sediment
and Trash
Pollutants that tend to
associate with fine particles
during treatment
Pollutants that tend to
be dissolved following
treatment
Sediment X X
Nutrients X X
Heavy Metals X
Organic Compounds X
Trash & Debris X
O.D.S X
Bacteria X
Oil & Grease X
Pesticides X
Per Section 4 of this WQTR, the Pollutant of Concern for the proposed project is
Organic Compounds. As shown above, Organic Compounds tend to associate
with fine particles during treatment. The project is anticipated to produce
Sediment, Nutrients, Heavy Metals, Trash & Debris, and Oil & grease; BMPs for
these pollutants must meet the MEP standard. Therefore, only those Treatment
Control BMPS with a medium to high removal efficiency for coarse sediment and
trash, pollutants that tend to associate with fine particles during treatment, or
pollutants that tend to be dissolved following treatment shall be considered for
use in the proposed project.
Table 5.1.3 Treatment Control BMP Selection Matrix
Pollutant of Concern
Bi
o
r
e
t
e
n
t
i
o
n
Fa
c
i
l
i
t
i
e
s
(
L
I
D
)
Se
t
t
l
i
n
g
B
a
s
i
n
s
(D
r
y
P
o
n
d
s
)
We
t
P
o
n
d
s
a
n
d
We
t
l
a
n
d
s
In
f
i
l
t
r
a
t
i
o
n
Fa
c
i
l
i
t
i
e
s
o
r
Pr
a
c
t
i
c
e
s
(LI
D
)
Me
d
i
a
F
i
l
t
e
r
s
Hig
h
-
r
a
t
e
Bi
o
f
i
l
t
e
r
s
Hig
h
-
r
a
t
e
Me
d
i
a
F
i
l
t
e
r
s
Tr
a
s
h
R
a
c
k
s
&
Hy
d
r
o
d
y
n
a
m
i
c
De
v
i
c
e
s
Coarse Sediment and Trash H H H H H H H H
Pollutants that tend to
associate with fine particles
during treatment
H H H H H M M L
Pollutants that tend to be
dissolved following treatment M L M H L L L L
Per Table 5.1.3, only Bioretention Facilities, Wet Ponds and Wetlands, and
Infiltration Facilities provide a high removal efficiency for the pollutant of concern,
Organic Compounds, and meet the MEP standard for the other pollutants
associated with the proposed project.
18H.E. Job No. 08020
5.2 Town Center (Service & Mixed Retail), Residential (attached &
detached), Parks and Schools
Table 5.2.1 Site Design and Source Control Storm Water BMP Selection Matrix
Priority Project
Category
Si
t
e
D
e
s
i
g
n
B
M
P
s
1
So
u
r
c
e
C
o
n
t
r
o
l
B
M
P
s
2 Requirements Applicable to
Individual Priority Project Categories(3)
a.
P
r
i
v
a
t
e
R
o
a
d
s
b.
R
e
s
i
d
e
n
t
i
a
l
Dr
i
v
e
w
a
y
s
&
G
u
e
s
t
P
a
r
k
i
n
g
c.
D
o
c
k
A
r
e
a
s
d.
M
a
i
n
t
e
n
a
n
c
e
Ba
yS
e.
V
e
h
i
c
l
e
W
a
s
h
Ar
e
a
s
f.
O
u
t
d
o
o
r
Pr
o
c
e
s
s
i
n
g A
r
e
a
s
g.
E
q
u
i
p
m
e
n
t
Wa
s
h
A
r
e
a
s
h.
P
a
r
k
i
n
g
A
r
e
a
s
i.
R
o
a
d
w
a
y
s
j.
F
u
e
l
i
n
g
A
r
e
a
s
k.
H
i
l
l
s
i
d
e
La
n
d
s
c
a
pin
g
Detached Residential
Development R R R R R
Attached Residential
Development R R R
Commercial
Development R R R R R R
Automotive Repair
Shop R R R R R R R
Restaurants R R R R
Hillside Development R R R R
Parking Lots R R R(4)
Streets, Highways &
Freeways R R R
R= Required
(1) Refer of Section 3.6.2.a of the Development Storm Water Manual
(2) Refer of Section 3.6.2.b of the Development Storm Water Manual
(3) Priority project categories must apply specific storm water BMP requirements, where applicable. Projects are
subject to the requirements of all priority project categories that apply.
(4) Applies if the paved area totals>5,000 square feet or with >15 parking spaces and is potentially exposed to
urban runoff.
Per Table 5.2.1, the future development shall incorporate Site Design and
Source Control BMPs as well as the requirements applicable individual priority
projects as highlighted above. Detailed site plans and priority project
classifications for individual lots are not available at this time; additional priority
project classifications may become applicable as said site plans become
available. Developers for each planning area associated with the Village 8 SPA
Plan will be required to submit for City review and approval site-specific Water
Quality Technical Reports prior to obtaining any land development permits. Such
site specific WQTRs shall specify those priority project classifications appropriate
to the specific project and shall meet all associated priority project specific BMP
requirements.
19H.E. Job No. 08020
Table 5.2.2 Pollutants of Concern Response to Treatment
Pollutant Coarse Sediment
and Trash
Pollutants that tend to
associate with fine particles
during treatment
Pollutants that tend to
be dissolved following
treatment
Sediment X X
Nutrients X X
Heavy Metals X
Organic Compounds X
Trash & Debris X
O.D.S X
Bacteria X
Oil & Grease X
Pesticides X
Per Section 4 of this WQTR, there are no Pollutants of Concern. However, only
storm water BMPs meeting the MEP standard for Sediments, Nutrients, Heavy
Metals, Trash & Debris, O.D.S, Bacteria, Oil & Grease, and Pesticides shall be
permitted. Therefore, only those Treatment Control BMPs with a medium to high
removal efficiency for coarse sediment and trash, pollutants that tend to
associate with fine particles during treatment, or tend to be dissolved following
treatment shall be considered for use in the proposed project.
Table 5.2.3 Treatment Control BMP Selection Matrix
Pollutant of Concern
Bi
o
r
e
t
e
n
t
i
o
n
Fa
c
i
l
i
t
i
e
s
(
L
I
D
)
Se
t
t
l
i
n
g
B
a
s
i
n
s
(D
r
y
P
o
n
d
s
)
We
t
P
o
n
d
s
a
n
d
We
t
l
a
n
d
s
In
f
i
l
t
r
a
t
i
o
n
Fa
c
i
l
i
t
i
e
s
o
r
Pr
a
c
t
i
c
e
s
(LI
D
)
Me
d
i
a
F
i
l
t
e
r
s
Hi
g
h
-
r
a
t
e
Bi
o
f
i
l
t
e
r
s
Hi
g
h
-
r
a
t
e
Me
d
i
a
F
i
l
t
e
r
s
Tr
a
s
h
R
a
c
k
s
&
Hy
d
r
o
d
y
n
a
m
i
c
De
v
i
c
e
s
Coarse Sediment and Trash H H H H H H H H
Pollutants that tend to
associate with fine particles
during treatment
H H H H H M M L
Pollutants that tend to be
dissolved following treatment M L M H L L L L
Per Table 5.2.3, only Bioretention Facilities, Wet Ponds and Wetlands, and
Infiltration Facilities have a medium to high removal efficiency and meet the MEP
standard for the pollutants associated with the future development. As discussed
in Section 1, specific water quality measures related to the development of
individual pads will be addressed in development specific WQTRs. Treatment
Control BMPs with a medium to high removal efficiency for pollutants specific to
the development shall be chosen and described within the development specific
supplemental WQTRs.
20H.E. Job No. 08020
5.3 LID and Site Design BMPs for Backbone Infrastructure
Similar to most development projects, peak flows increase with urban
development of Village 8 West. However, Per the HMPTAC recommendations,
the HMP has listed the Otay River Valley as a facility that is exempt from
hydromodification. Therefore, hydromodification measures are not be needed for
the areas tributary to the Otay River discharge point. Hydromodification shall be
implemented for the areas tributary to the Wolf Canyon discharge point to
maintain the integrity of Wolf Canyon.
Additionally, the backbone infrastructure shall be designed to minimize directly
connected impervious surfaces and to promote infiltration using LID techniques.
To this end, the project shall minimize, to the maximum extent practicable, the
introduction of Pollutants and Conditions of Concern into the storm water
conveyance system. This objective shall be addressed through the following
means:
Minimizing the Impervious Footprint
- Incorporating alternative street layouts to reduce road networks. La Media
Road, a 4-Lane Major road is designed with a 94' right-of-way rather than
the typical 100' right-of-way.
- Provided that public safety and a walkable environment for pedestrians is
not compromised, constructing streets and sidewalks to the minimum
widths. All sidewalks are constructed to the minimum width.
- Whenever practical, preserving existing native trees and shrubs to
maximize canopy interception and water conservation. A total of 21.1 acres
of the project site is to remain undeveloped and set aside as a combination
of Open Space and MSCP.
- Planting native or drought tolerant trees and large shrubs to maximize
canopy interception and water conservation.
- Minimizing the use of impervious surfaces, such as decorative concrete, in
the landscape design. Landscaping within the parkways throughout the
project also serve as Bioretention BMPs and contain minimal use of
impervious surfaces.
Conserving Natural Resources and Areas
- Utilizing natural drainage systems to the maximum extent practicable. The
site shall outlet to three existing discharge points. Two of the three points
discharge directly to the Otay River; the third point discharges to an
existing drainage path in Wolf Canyon that ultimately outlets to the Otay
River as well.
- Minimizing soil compaction.
Minimizing Directly Connected Impervious Areas
- Where landscaping is proposed, draining impervious sidewalks, pathways,
and trails into adjacent landscaping prior to discharging to the storm drain.
Specifically, all sidewalks within the proposed parkways are designed to
21H.E. Job No. 08020
drain to the adjacent landscaped areas prior to discharging to the storm
drain.
Protecting Slopes and Channels
- Minimizing disturbances to natural drainages. The project utilizes existing
discharge points to minimize impacts to natural drainages. A regional
analysis for the overall Otay development directly tributary to the Otay
River is being undertaken to demonstrate that an increase in peak 100-
year event flows will not have a negative effect on the downstream
receiving waterway. This regional analysis will also investigate
hydromodification impacts upon the Otay River to address current
Hydromodification Management Plan (HMP) criteria.
- Conveying runoff safely from the tops of slopes. Runoff is collected within
concrete drainage ditches located at the tops of the proposed slopes and
transported safely to the proposed storm drain system.
- Vegetating slopes with native or drought tolerant vegetation
- Controlling and treating flows in landscaping and/or other controls prior to
reaching existing natural drainage systems. The proposed project
incorporates Bioretention BMPs in the median along La Media Road and
parkways throughout the site. These BMPs shall treat flows prior to their
entrance to the proposed storm drain system and subsequent discharge to
the existing natural drainage systems.
-Installing energy dissipators, such as rip rap, at the outlets of new storm
drains, culverts, or conduits that enter unlined channels in accordance with
applicable specifications to minimize erosion. Energy dissipators shall be
installed at each of the three outlet points in such a way as to minimize
impacts to receiving waters.
Using Natural Site Design Features (LID) to the MEP
- Incorporating alternative street layouts to reduce road networks. La Media
Road, a 4-Lane Major road is designed with a 94' right-of-way rather than
the typical 100' right-of-way
- Whenever practical, preserving existing native trees and shrubs to
maximize canopy interception and water conservation. A total of 21.1 acres
of the project site is to remain undeveloped and set aside as a combination
of Open Space and MSCP.
- Planting native or drought tolerant trees and large shrubs to maximize
canopy interception and water conservation.
- Minimizing soil compaction.
- Utilizing natural drainage systems to the maximum extent practicable. The
site shall outlet to three existing discharge points. Two of the three points
discharge directly to the Otay River; the third point discharges to an
existing drainage path in Wolf Canyon that ultimately outlets to the Otay
River as well.
- Where landscaping is proposed, draining impervious sidewalks, pathways,
and trails into adjacent landscaping prior to discharging to the storm drain.
Specifically, all sidewalks within the proposed parkways are designed to
22H.E. Job No. 08020
drain to the adjacent landscaped areas prior to discharging to the storm
drain.
5.4 Source Control BMPs for Backbone Infrastructure
Source-control BMPs are activities, practices, and procedures (primarily non-
structural) that are designed to prevent urban runoff pollution. These measures
either reduce the amount of runoff from the site or prevent contact between
potential pollutants and storm water. In addition, source-control BMPs are often
the best method to address non-storm (dry-weather) flows.
Provide Storm Drain System Stenciling and Signage
Storm drain stencils are highly visible source control messages, typically
placed directly adjacent to storm drain inlets. The stencils contain a brief
statement that prohibits the dumping of improper materials into the urban
runoff conveyance system. Graphical icons, either illustrating anti-dumping
symbols or images of receiving water fauna, are effective supplements to the
anti-dumping message. The project design shall include the following
requirements:
- Providing stenciling or labeling of all storm drain inlets and catch basins
with the project area with prohibitive language (such as "NO DUMPING-I
LIVE DOWNSTREAM") and/or graphical icons to discourage illegal
dumping.
- Maintaining legibility of stencils and signs.
Note: Storm drain stenciling and signage within public right-of-way shall be in
accordance with Chula Vista Construction Standard CVCS 24 (See Appendix B).
Use Efficient Irrigation Systems and Landscape Design, and Employ
Integrated Pest Management Principles
The project shall design the timing and application methods of irrigation water
to minimize the runoff of excess irrigation water into the storm water
conveyance system. In compliance with the Water Conservation in
Landscaping Act, the following methods to reduce excessive irrigation runoff
shall be considered, and incorporated and implemented where determined
applicable and feasible by the City of Chula Vista:
- Employ rain shutoff devices to prevent irrigation after precipitation.
- Design irrigation systems to each landscape area's specific water
requirements
- Use flow reducers or shutoff valves triggered by a pressure drop to control
water loss in the event of broken sprinkler heads or lines.
23H.E. Job No. 08020
Incorporate Requirements Applicable to Individual Priority Project Categories
Per Table 5.1.1, the following requirements shall be implemented within the
proposed project:
- Roadways
Per Section 3.6.2 of the Development Storm Water Manual, The project
shall select Treatment Control BMPs following the treatment control
selection procedure identified within the section:
The project shall compare the list of pollutants for which the
downstream receiving waters are impaired with the pollutants
anticipated to be generated by the project as identified by Table 3.1 of
the Manual (Table 5.1.1 of this WQTR).
Any pollutants identified by Table 3.1, which are also causing a Clean
Water Act section 303(d) impairment of the receiving waters, shall be
considered Primary Pollutants of Concern.
The project shall meet all applicable BMP requirements identified in
Section 3.6.2
The project shall select a single or combination of storm water BMPs
from Table 3.3 (Table 5.1.3 of this WQTR), which maximize pollutant
removal efficiency for the particular Primary Pollutant(s) of Concern.
See Sections 4 and 5 of this WQTR for further information.
5.5 Treatment Control BMPs for Backbone Infrastructure
Post-construction “treatment control” storm water management BMPs provide
treatment for storm water emanating from the project site. Implementation of
NPDES General Permit requirements entails the use of post-construction BMPs
that will remain in service to protect water quality throughout the life of the
project. Structural BMPs are an integral element of post-construction storm
water management and include storage, filtration, and infiltration practices.
BMPs have varying degrees of effectiveness versus different pollutants of
concern. In addition, treatment-control BMPs are often the best method to
address initial (first flush) flows.
5.5.1 Structural BMP Selection
The Pollutant of Concern for the proposed backbone infrastructure is Organic
Compounds. Other anticipated pollutants for the proposed project are Sediments,
Nutrients, Heavy Metals, Trash & Debris, and Oil and Grease. Bioretention
Facilities have a high pollutant removal efficiency for Organic Compounds, meet
the MEP standard for all other anticipated pollutants, are relatively inexpensive to
construct and maintain, can be incorporated into the proposed landscaping, have
a low probability of ground water contamination, and require a relatively small
footprint for treatment. Therefore, Bioretention Facilities shall be incorporated in
the form of bioretention tree wells and bioretention swales. Bio-retention areas
24H.E. Job No. 08020
shall be incorporated for all detached-residential lots; these areas shall be tied to
the bioretention swales within the roadways via perforated pipe.
The proposed off-site utility access road consists of a 12’ wide asphalt paved
roadway edged on either side with permeable gravel. Given the minimal traffic
expected on this roadway, the lack of run-on onto the roadway, and the desire to
minimize the impact to the MSCP, no bioretention BMPs are proposed along this
portion of roadway. Rather, the permeable gravel shall provide adequate
infiltration of the minor runoff due to the access roadway.
5.5.2 Structural BMP Locations
The chosen Structural Treatment Control storm water BMPs are located on-site
to minimize costs and maximize pollutant removal prior to runoff entering
receiving waters. The Bioretention BMPs have a high pollutant removal efficiency
rating for Organic Compounds, the Pollutant of Concern. Each Bioretention BMP
shall be fully operational prior to the use of any dependent phase of
development. In the event that interim storm water BMPs are deemed necessary,
said interim BMPs shall proved equivalent or greater treatment than is required
per the design criteria set forth in the Development Storm Water Manual. Such
interim BMPs shall remain in use until the permanent Structural BMPs are
operational.
5.5.3 Restrictions on the Use of Infiltration BMPs
The Bioretention BMPs are not designed to function primarily as infiltration
devices and are, therefore, not subject to the limitations as set forth in Section
3.6.2.c of the Development Storm Water Manual.
5.5.4 Design Criteria and Numeric Sizing
The Bioretention IMPs are designed to meet the area-based Treatment Control
BMP Standards as set forth in Section 3.6.2.C of the Development Storm Water
Manual.
All BMP design calculations assume that all off-site (Village 7, City of San Diego
Reservoir, and Parcel ‘A’) and future development (Town Center, Attached &
Detached Residential, Parks and Schools) runoff is treated prior to the
confluence with backbone storm drain system. BMP calculations are included for
the bioretention tree wells necessary to provide treatment for runoff from the
small portion of Otay Valley Road that drains easterly to Village 8 East such that
the runoff from Village 8 West is treated prior to the confluence with the Village 8
East backbone storm drain system. Each single family residential lots shall be
designed with a bio-retention area within the lot that is sized to treat runoff per
the area-based Treatment Control BMP Standards as set forth in Section 3.6.2.C
of the Development Storm Water Manual. Lot specific Structural BMPs for the
Town Center, Attached Residential, Parks, and Schools shall be implemented as
these lots are developed and shall meet the numeric sizing standards set forth in
the Development Storm Water Manual.
25H.E. Job No. 08020
BMP design calculations are included in Appendix C.
6 Maintenance
The responsible party shall ensure ongoing long-term maintenance of all
Structural BMPs through such means as may be appropriate, at the discretion of
the City of Chula Vista, including but not limited to covenants, legal agreements,
maintenance agreements, and/or conditional use permits.
6.1 Annual Maintenance Costs
This section provides a cost estimate for the construction and maintenance of the
post-construction BMPs proposed for the project site.
Table 6.1.1 Estimated O&M Costs for Structural BMPs Within the Right-of-Way
BMP Type Maintenance
Type
Maintenance
Interval
Annual
Maintenance
Cost
Maintenance
Area
Total
Maintenance
Cost
Tree Well Inspection &
Maintenance Monthly $10/Tree Well 1,443
Tree Wells
$14,430
Bioretention
Swale
Inspection &
Maintenance Monthly $0.70/ft2 39,010 ft2 $27,307
Subtotal $41,737
10% Contingency $4,174
Total $45,911
Table 6.1.2 Estimated O&M Costs for Public Facilities
BMP Type Maintenance
Type
Maintenance
Interval
Annual
Maintenance
Cost
Maintenance
Area
Total
Maintenance
Cost
Hydromod
Basin
Inspection &
Maintenance Monthly $0.20/ft2 85,000 ft2$17,000
Subtotal $17,000
10% Contingency $1,700
Total $18,700
Table 6.1.3 Estimated O&M Costs for Private Structural Facilities
BMP Type Maintenance
Type
Maintenance
Interval
Annual
Maintenance
Cost
Maintenance
Area
Total
Maintenance
Cost
SF Bio-
Retention
Areas
Inspection Twice
Annually
$0.25/ft2 56,500 ft2$14,125
Subtotal $14,125
10% Contingency $1,413
Total $15,538
26H.E. Job No. 08020
6.2 Maintenance Mechanisms
The following is a list of City approved maintenance mechanisms:
Table 6.2.1 BMP Maintenance Mechanisms
Public Entity Maintenance. The City of Chula Vista may approve a public or quasi-
public entity (e.g. the County Flood Control District, or annex to an existing assessment
district, an existing utility district, a state or federal resource agency, or a conservation
conservancy) to assume responsibility for maintenance, repair and replacement of the
BMPs. Unless otherwise approved by the City, public entity maintenance agreements
shall ensure estimated costs are front-funded or reliably guaranteed. (e.g. through a trust
fund, assessment district fees, bond, letter of credit or similar means). In addition, the City
may seek protection from liability by appropriate releases and indemnities. The City must
be identified as a third party beneficiary empowered to enforce any such maintenance
agreement within its jurisdiction.
Project Proponent Agreement to Maintain Storm Water BMPs. The City enters
into a contract with the project proponent obliging the project proponent and successors to
maintain, repair, and replace the storm water BMP as necessary into perpetuity. Security
may be required.
Assessment District. The City approves an Assessment District or other funding
mechanism created by the project proponent to provide funds for storm water
BMP maintenance, repair, and replacement on an ongoing basis. Any agreement
with such a District shall be subject to the Public Entity Maintenance provisions
above.
Lease Provisions. In those cases where the City of Chula Vista holds title to the land in
question, and the land is being leased to another party for private or public use, the
County may assure storm water BMP maintenance, repair and replacement through
conditions in the lease.
Conditional Use Permits. For discretionary projects that require a use permit, the City
may assure maintenance of storm water BMPs through the inclusion of maintenance
conditions in the Conditional Use Permit. Security may be required.
Alternative Mechanism. The City may in its discretion accept alternative maintenance
mechanisms if such mechanisms are as protective as those listed above
Of the above listed maintenance mechanisms, an Assessment Districtis the
most suitable choice for the proposed project. Otay Land Company, LLC shall
create a Community Facilities District (CFD), maintenance of the public
Treatment Control BMPs shall be amongst the responsibilities of the CFD.
Individual homeowners shall be responsible for maintenance of the bioretention
areas located within the single family lots.
6.3 Maintenance Requirements
Per Section 3.7.3 of the Development Storm Water Manual, a copy of the project
Inspection, Operation, and Maintenance Plan (IOMP) is included as Appendix F
of this Water Quality Technical Report.
27H.E. Job No. 08020
The CFD, as responsible party for the maintenance of the proposed project
BMPs, shall maintain the IOMP forms to document all maintenance requirements
and retain records for at least 5 years. These documents shall be made available
to the City for inspection upon request at any time.
Per Section 8 of the Development Storm Water Manual, the Owner shall enter
into a maintenance agreement with the City of Chula Vista for the inspection and
maintenance of storm water facilities. This agreement shall provide City staff
access to BMPs for inspection purposes. The agreement shall run with the land
throughout the life of the project, until such time that the storm water BMPs
requiring maintenance and access are replaced and maintenance and access
are no longer needed, all to the satisfaction of the City of Chula Vista. A template
for this agreement is included as Appendix D.
6.4 Fiscal Resources
There are multiple bioretention based BMPs within the Otay Ranch Village 8
West site for storm water quality treatment.
Funding for all water quality treatment BMPs within the public right-of-way shall
be provided by the CFD. The CFD will be responsible to perform the
maintenance activities and to ensure adequate funding into perpetuity.
The City of Chula Vista Watershed protection, Stormwater Management, and
Discharge Control Ordinance require ongoing maintenance of BMPs to ensure
the proper function and operation of these BMPs. Costs for the maintenance of
BMPs within the right-of-way shall be the responsibility of the CFD at the time of
inception and by the contractor during construction of the development.
The CFD for the Otay Ranch Village 8 West development shall be fiscally
responsible for the maintenance and upkeep of the BMPs within the right-of-way
indefinitely.
Additionally, a BMP Maintenance Agreement with Easement and/or Covenant
shall be entered into with the City which will function in three ways. The
easement will be dedicated on the Final Map. The agreement will commit the
land to being used only for the purposes of the BMP. The agreement will include
an agreement by the landowner to maintain the facilities in accordance with the
WQTR. This agreement shall be passed on to future purchasers or successors of
the landowner as a covenant. The final map shall include an easement giving the
City the right to enter onto the land and any adjacent land needed for access to
inspect the BMPs.
At no such time shall the maintenance of the post-construction BMPs go
unperformed for any reason.
28H.E. Job No. 08020
7 Geotechnical/Soils Report
Advanced Geotechnical Solutions, INC. (AGS) issued "Revised Geotechnical
Investigation Village 8 West, Otay Ranch, Chula Vista, CA" dated October 22,
2010. The following as a summary of the findings and recommendations
pertinent to water quality contained within that report:
Potential for Infiltration BMPs
The infiltration of standing water into all BMP’s could potentially be
detrimental to improvements such as slopes, foundations, utility trenches,
retaining walls and pavement sections. Geotechnical review of grading plans
should be performed when available to determine which storm drain
imfiltration devices may require mitigation such as collection and discharging
accumulated subsurface water away from improvements.
Site Design Recommendations
- Six-(6) and eight-(8) inch canyon subdrains are recommended for on-
site canyon areas that will receive compacted fill. The drains should
be placed along the lowest alignment of canyon removals. Final
determination of drain locations will be made in the field based on
exposed conditions.
- In some instances post-grading irrigation practices and rainfall
patterns can create seepage in cut and fill slopes. This seepage is
more prevalent in cut slopes excavated in Santiago Peak Volcanics or
fill slopes constructed out of shot rock. Where nuisance seepage is
observed, drains are typically installed to collect this water and outlet
it into suitable surface or subsurface drainage devices. These drains,
if required, should be installed on a case by case basis per the
geotechnical consultant’s recommendations.
- The infiltration of standing water into all BMPs could potentially be
detrimental to improvements such as slopes, foundations, utility
trenches, retaining walls and pavement sections. Geotechnical review
of grading plans should be performed when available to determine
which storm drain infiltration devices may require mitigation such as
collecting and discharging accumulated subsurface water away from
improvements.
Groundwater
Active springs or surface seeps were not observed during the geologic field
mapping or subsurface investigation. It is possible that seasonal groundwater
associated with precipitation intermittently occurs in on-site drainages. Owing
to the depth of cut, it is possible that seasonal nuisance water trapped along
joints or beds may be encountered during grading especially in the Santiago
Peak Volcanics. Minor seeps or wet areas were observed in Borings BA-9,
BA-11, and BA-12.
29H.E. Job No. 08020
For further information, please see Appendix E Geotechnical Investigation.
Grading operations are subject to possible phasing. Section 7 of the City of
Chula Vista Development Storm Water Manual identifies potential limitations to
“unprotected” disturbed area. It may be necessary to deploy erosion and
sediment control BMP’s in disturbed areas where grading operations are not
completed.
8 Construction Activity BMPs
Discharge of storm water runoff associated with construction activities shall be
addressed in a Storm Water Pollution Prevention Plan (SWPPP). The SWPPP
shall be prepared in accordance with the Regional Water Quality Control Board
(RWQCB) and City of Chula Vista requirements.
The construction activity BMPs will be implemented to reduce construction
related impacts and provide acceptable stabilization of the project site. It may be
necessary to implement some BMPs prior to clearing and grubbing. If the
proposed project incorporates phased grading operations, the construction
activity BMPs shall take into account the interim grading conditions.
9 Hydromodification
The attenuation provided by the Savage Dam on 60% of the overall watershed
mitigates the increase in flows from development downstream of the dam (i.e. a
492.8 cfs increase from Village 9 and 12) as compared to the flows prior to the
dam construction. Detention for any development below the dam would be
ineffective as the peak flows from these smaller watersheds would pass well
before the reservoir would fill to the point that flows would overtop the spillway.
Per the Otay River Watershed Assessment Report, the existing Otay River
downstream of the dam is starved for sediment and peak flows, stating
“Theoretically, an increase in peak flow would tend to counteract the degradation
trends by replacing water impounded by the reservoir and helping the River
maintain its original platform”. Therefore no detention basins are proposed for
this project other than bioretention and extended detention basins that may be
used as Water Quality Devices.
A Hydromodification Management Plan (HMP) was prepared for the County of
San Diego, and approved on July 14, 20103. The plan exempts the Otay River
from hydromodification criteria, based in part, on the contributing drainage area
exceeding 100 square miles as well as having a 100-year design flow over
20,000 cfs. Based on the HMP, river systems meeting this criteria tend to be
“depositional and have very wide floodplains”. In addition, the HMP states that
river systems of the like, “typically have very low gradients. The combination of
low gradients, significant peak attenuation, and wide floodplain areas translate to
3 The Final HMP entered the implementation phase on January 14, 2011.
30H.E. Job No. 08020
a low potential for channel erosion”. Therefore, the portion of the project directly
tributary to the Otay River is exempt from the Hydromodification Criteria.
Hydromodification shall be implemented for the areas tributary to the Wolf
Canyon discharge point to maintain the integrity of Wolf Canyon. Calculations for
the sizing of the Wolf Canyon retention basin are included in the Hale
Engineering Report entitled “Hydromodification Study For Otay Ranch Village 8
West” Dated May 11, 2011.
Appendix A
Appendix B
Appendix C
Bio-Retention BMP Access Spacing Calculations
I. Curb Cut Spacing Tree Wells
Given:
Proposed 1’ Curb Cut @ 23’ O.C.
Tributary roadway width = 57.5’
Runoff Coefficient, C = 0.85
Water Quality Runoff Rate, I = 0.2 in/hr
Max Roadway Slope, S = 0.059
Then:
Tributary area, A = 23’x57.5’ = 1,323 ft2
Water Quality Flow, Q = CIA = 0.85x(0.2 in/hr)x(1,323 ft2) = 0.052 cfs
Depth of Flow in Gutter
Given Input Data:
Shape ........................... Trapezoidal
Solving for ..................... Depth of Flow
Flowrate ........................ 0.0520 cfs
Slope ........................... 0.0590 ft/ft
Manning's n ..................... 0.0160
Height .......................... 6.0000 in
Bottom width .................... 0.0000 in
Left slope ...................... 0.0833 ft/ft (V/H)
Right slope ............. 1000.0000 ft/ft (V/H)
Computed Results:
Depth ........................... 0.7631 in
Velocity ........................ 2.1421 fps
Full Flowrate ................... 12.7112 cfs
Flow area ....................... 0.0243 ft2
Flow perimeter .................. 9.9557 in
Hydraulic radius ................ 0.3511 in
Top width ....................... 9.1616 in
Area ............................ 1.5007 ft2
Perimeter ....................... 78.2783 in
Percent full .................... 12.7184 %
Capacity of Curb Cut at Flow Depth
Lt= 1’
a = 0.17’
y = depth of flow in gutter = 0.7631” = 0.06’
Q = 0.7xLtx(a+y)1.5 = 0.079 cfs
Inlet Capacity = 0.079 cfs > Gutter Flow = 0.052 cfs OK
II. Curb Cut Spacing at Bio-Swales
Given:
Proposed 1’ Curb Cut @ 300’ O.C.
Tributary roadway width = 31’
Runoff Coefficient, C = 0.81
Water Quality Runoff Rate, I = 0.2 in/hr
Max Roadway Slope, S = 0.087
Then:
Tributary area, A = 300’x31’ = 9,300 ft2
Water Quality Flow, Q = CIA = 0.81x(0.2 in/hr)x(9,300 ft2) = 0.035 cfs
Depth of Flow in Gutter
Given Input Data:
Shape ...................................... Trapezoidal
Solving for ............................ Depth of Flow
Flowrate .................................... 0.0350 cfs
Slope ........................................ 0.0870 ft/ft
Manning's n ..................................... 0.0160
Height .......................................... 6.0000 in
Bottom width ................................ 0.0000 in
Left radius .................................... 0.0000 in
Right radius ................................. 0.0000 in
Left slope ........................... 0.0833 ft/ft (V/H)
Right slope ................... 1000.0000 ft/ft (V/H)
Computed Results:
Depth .......................................... 0.6116 in
Velocity ...................................... 2.2444 fps
Full Flowrate ............................. 15.4355 cfs
Flow area .................................... 0.0156 ft2
Flow perimeter .............................. 7.9794 in
Hydraulic radius ............................ 0.2814 in
Top width ..................................... 7.3430 in
Area ........................................... 1.5007 ft2
Perimeter ................................... 78.2783 in
Percent full ................................ 10.1937 %
Capacity of Curb Cut at Flow Depth
Lt = 1’
a = 0.17’
y = depth of flow in gutter = 0.5251” = 0.04
Q = 0.7xLtx(a+y)1.5 = 0.069 cfs
Inlet Capacity = 0.069 cfs > Gutter Flow = 0.035 cfs OK
DMA Calculations
Otay Ranch Village 8 West
Chula Vista, CA
664-070-07
47.70Acres(Backbone Infrastructure Only)
0.55in
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
GUEPCC3,4531.003,453Curb Length=960 lf
RoadwayAC29,9861.0029,986Spacing=16o.c.
Sidewalk/
Curb PCC5,3281.005,328
ParkwayPCC5,0291.005,029
6,814.00Tree Well1,7850.10178
Total45,581 0.96 43,9750.041,7591,785
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
GUELandscape7770.1078Curb Length=172 lf
RoadwayAC7,5911.007,591Spacing=11o.c.
Sidewalk/
Curb PCC1,8541.001,854
ParkwayPCC1,0051.001,005
1,459.00Tree Well4540.1045
Total11,681 0.91 10,5730.04423454
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
GUEPCC3,1971.003,197Curb Length=1,343 lf
RoadwayAC33,7241.0033,724Spacing=18o.c.
Sidewalk/
Curb PCC10,3031.0010,303
ParkwayPCC7,0341.007,034
9,242.00Tree Well2,2080.10221
Total56,466 0.96 54,4790.042,1792,208
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
GUEPCC6,4861.006,486Curb Length=1,982 lf
RoadwayAC38,8011.0038,801Spacing=21o.c.
Sidewalk/
Curb PCC10,0311.0010,031
ParkwayPCC15,7161.0015,716
18,590.00Tree Well2,8740.10287
Total73,908 0.97 71,3220.042,8532,874
Project Name:
85TH Percentile Storm Depth:
Total Project Area:
APN:
Project Location:
L1
L2
Proposed
DMA Area
(ft2)
Minimum
DMA Area
(ft2)
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
L4
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
L3
Proposed
DMA Area
(ft2)
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
I. Bio-Retention IMPs:
IMP Sizing
Factor
DMA Calculations
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
GUEPCC8311.00831Curb Length=179 lf
RoadwayAC5,9151.005,915Spacing=14o.c.
Sidewalk/
Curb PCC1,2841.001,284
ParkwayPCC1,4491.001,449
1,842.00Tree Well3930.1039
Total9,872 0.96 9,5180.04381393
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
GUEPCC2,8881.002,888Curb Length=686 lf
RoadwayAC15,8141.0015,814Spacing=19o.c.
Sidewalk/
Curb PCC4,7161.004,716
ParkwayPCC2,9441.002,944
4,033.00Tree Well1,0890.10109
Total27,451 0.96 26,4710.041,0591,089
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
GUEPCC2,7741.002,774Curb Length=972 lf
RoadwayAC14,8211.0014,821Spacing=24o.c.
Sidewalk/
Curb PCC4,8481.004,848
ParkwayPCC8,4161.008,416
9,656.00Tree Well1,2400.10124
Total32,099 0.97 30,9830.041,2391,240
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
GUEPCC6651.00665Curb Length=136 lf
RoadwayAC4,7941.004,794Spacing=12o.c.
Sidewalk/
Curb PCC1,6021.001,602
ParkwayPCC7401.00740
1,073.00Tree Well3330.1033
Total8,134 0.96 7,8350.04313333
L6
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
L8
L7
L5 IMP Sizing
Factor
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
DMA Calculations
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
GUEPCC3,1281.003,128Curb Length=747 lf
RoadwayAC16,6751.0016,675Spacing=20o.c.
Sidewalk/
Curb PCC5,0771.005,077
ParkwayPCC3,2431.003,243
4,392.00Tree Well1,1500.10115
Total29,272 0.96 28,2370.041,1291,150
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
GUEPCC6,1321.006,132Curb Length=886 lf
RoadwayAC24,5121.0024,512Spacing=16o.c.
Sidewalk/
Curb PCC5,5951.005,595
ParkwayPCC4,6081.004,608
6,272.00Tree Well1,6640.10166
Total42,511 0.96 41,0140.041,6411,664
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
GUEPCC5451.00545Curb Length=108 lf
RoadwayAC6,3611.006,361Spacing=8o.c.
Sidewalk/
Curb PCC1,6781.001,678
ParkwayPCC6711.00671
1,064.00Tree Well3930.1039
Total9,648 0.96 9,2940.04372393
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
GUEPCC3,2781.003,278Curb Length=772 lf
RoadwayAC24,3571.0024,357Spacing=16o.c.
Sidewalk/
Curb PCC5,5081.005,508
ParkwayPCC3,0401.003,040
4,522.00Tree Well1,4820.10148
Total37,665 0.96 36,3310.041,4531,482
L10 IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
L9 IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
L11 IMP Sizing
Factor
Minimum
DMA Area
(ft2)
L12 IMP Sizing
Factor
Minimum
DMA Area
(ft2)
DMA Calculations
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
GUEPCC2,1391.002,139Curb Length=527 lf
RoadwayAC14,9651.0014,965Spacing=15o.c.
Sidewalk/
Curb PCC3,4471.003,447
ParkwayPCC6,5251.006,525
7,614.00Tree Well1,0890.10109
Total28,165 0.97 27,1850.041,0871,089
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
Curb Length=814 lf
RoadwayAC27,6581.0027,658Spacing=15o.c.
Sidewalk/
Curb PCC8,8441.008,844
ParkwayPCC2,8701.002,870
4,473.00Tree Well1,6030.10160
Total40,975 0.96 39,5320.041,5811,603
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
GUELandscape3,7460.10375Curb Length=1,555 lf
RoadwayAC16,4761.0016,476Spacing=32o.c.
Sidewalk/
Curb PCC6,7251.006,725
ParkwayPCC12,9461.0012,946
14,428.00Tree Well1,4820.10148
Total41,375 0.89 36,6700.041,4671,482
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
RoadwayAC & PCC25,7861.0025,786Curb Length=839 lf
GUEPCC3,1971.003,197Spacing=16o.c.
Sidewalk/
Curb PCC5,2331.005,233
ParkwayPCC5,6981.005,698
7,331.00Tree Well1,6340.10163
Total41,547 0.96 40,0770.041,6031,634
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
Curb Length=454 lf
RoadwayAC11,4561.0011,456Spacing=17o.c.
Sidewalk/
Curb PCC5,9751.005,975
ParkwayPCC2,0171.002,017
2,803.00Tree Well7870.1079
Total20,234 0.97 19,5260.04781787
Minimum
DMA Area
(ft2)
L13 IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
L16
Proposed
DMA Area
(ft2)
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
L15 IMP Sizing
Factor
L14
L17
DMA Calculations
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
GUELandscape1,9450.10195Curb Length=455 lf
RoadwayAC8,9831.008,983Spacing=23o.c.
Sidewalk/
Curb PCC3,4301.003,430
ParkwayPCC2,1981.002,198
2,803.00Tree Well6050.1061
Total17,161 0.87 14,8660.04595605
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
GUELandscape1,9670.10197Curb Length=464 lf
RoadwayAC8,8551.008,855Spacing=23o.c.
Sidewalk/
Curb PCC3,3851.003,385
PlanterPCC2,2431.002,243
2,848.00Tree Well6050.1061
Total17,055 0.86 14,7400.04590605
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
GUEPCC1,9361.001,936Curb Length=451 lf
RoadwayAC11,1291.0011,129Spacing=18o.c.
Sidewalk/
Curb PCC3,5071.003,507
ParkwayPCC2,0161.002,016
2,772.00Tree Well7560.1076
Total19,344 0.96 18,6630.04747756
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
RoadwayAC4,8731.004,873Curb Length=292 lf
GUELandscape1,3240.10132Spacing=24o.c.
Sidewalk/
Curb PCC2,3211.002,321
ParkwayPCC1,2401.001,240
1,603.00Tree Well3630.1036
Total10,121 0.85 8,6030.04344363
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
Curb Length=257 lf
RoadwayAC4,5941.004,594Spacing=20o.c.
Sidewalk/
Curb PCC3,6011.003,601
ParkwayPCC1,0021.001,002
1,395.00Tree Well3930.1039
Total9,590 0.96 9,2360.04369393
L19 IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
L18 IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
L22 IMP Sizing
Factor
Minimum
DMA Area
(ft2)
L20 IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
L21
Proposed
DMA Area
(ft2)
DMA Calculations
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
GUEPCC4881.00488Curb Length=447 lf
RoadwayAC9,9941.009,994Spacing=17o.c.
Sidewalk/
Curb PCC5,5171.005,517
ParkwayPCC3,3391.003,339
4,125.00Tree Well7870.1079
Total20,124 0.96 19,4160.04777787
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
GUELandscape2,0740.10207Curb Length=892 lf
RoadwayAC10,8751.0010,875Spacing=28o.c.
Sidewalk/
Curb PCC4,2351.004,235
ParkwayPCC8,5081.008,508
9,476.00Tree Well9680.1097
Total26,660 0.90 23,9220.04957968
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
Curb Length=2,266 lf
GUEPCC7,7251.007,725Spacing=29o.c.
Sidewalk/
Curb PCC13,3481.0013,348 IMP Sizing
Factor
Minimum
DMA Area
Proposed
DMA Area
RoadwayAC & PCC72,7241.0072,724
MedianLandscape6,7380.10674
ParkwayPCC12,3941.0012,394
16,725.00Tree Well4,3310.10433
Total117,260 0.92 107,2970.044,2924,331
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
GUELandscape9,0600.10906Curb Length=2,213 lf
RoadwayAC65,1291.0065,129Spacing=19o.c.
Sidewalk/
Curb PCC13,0071.0013,007
ParkwayPCC8,7621.008,762
12,331.00Tree Well3,5700.10357
Total99,527 0.89 88,1600.043,5263,570
Proposed
DMA Area
(ft2)
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
L23 IMP Sizing
Factor
L24 IMP Sizing
Factor
Proposed
DMA Area
(ft2)
Minimum
DMA Area
(ft2)
L26 IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
L25
DMA Calculations
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
Curb Length=1,444 lf
RoadwayAC42,3261.0042,326Spacing=17o.c.
Sidewalk/
Curb PCC16,3451.0016,345
ParkwayPCC5,4861.005,486
8,087.00Tree Well2,6020.10260
Total66,758 0.96 64,4170.042,5772,602
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
Curb Length=1,777 lf
TrailD.G. 17,9150.101,792Spacing=33o.c.
Sidewalk/
Curb PCC1,5151.001,515
RoadwayAC & PCC61,2421.0061,242
MedianLandscape6,7380.10674
ParkwayPCC10,3151.0010,315
13,352.00Tree Well3,0380.10304
Total100,762 0.75 75,8400.043,0343,038
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
TrailD.G. 5,7670.10577
Sidewalk/
Curb PCC8911.00891Curb Length=571 lf
RoadwayAC & PCC25,5501.0025,550Spacing=26o.c.
MedianLandscape4570.1046
PlanterPCC3,0571.003,057
4,294.00Landscape1,2380.10124
Total36,959 0.82 30,2440.041,2101,238
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
GUELandscape1,6770.10168
Sidewalk/
Curb PCC4,7921.004,792Curb Length=829 lf
RoadwayAC & PCC36,2651.0036,265Spacing=25o.c.
MedianLandscape5570.1056
PlanterPCC4,3461.004,346
6,202.00Landscape1,8560.10186
Total49,492 0.93 45,8110.041,8321,856
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
L29
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
L28
L30
IMP Sizing
Factor
L27
Proposed
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
Minimum
DMA Area
(ft2)
DMA Calculations
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
TrailD.G. 2,0780.10208
Sidewalk/
Curb PCC4141.00414Curb Length=205 lf
RoadwayAC & PCC10,7151.0010,715Spacing=23o.c.
MedianLandscape1000.1010
ParkwayPCC1,0451.001,045
1,551.00Tree Well5060.1051
Total14,858 0.84 12,4420.04498506
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
GUELandscape2,9370.10294Curb Length=706 lf
RoadwayAC & PCC24,2691.0024,269Spacing=16o.c.
Sidewalk/
Curb PCC4,4971.004,497
ParkwayPCC2,6211.002,621
3,922.00Tree Well1,3010.10130
Total35,625 0.89 31,8110.041,2721,301
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
GUELandscape1,8280.10183Curb Length=442 lf
RoadwayAC & PCC13,2931.0013,293Spacing=18o.c.
Sidewalk/
Curb PCC2,8971.002,897
ParkwayPCC1,8511.001,851
2,607.00Tree Well7560.1076
Total20,625 0.89 18,2990.04732756
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
Curb Length=442 lf
RoadwayAC & PCC13,3791.0013,379Spacing=16o.c.
Sidewalk/
Curb PCC5,2391.005,239
ParkwayPCC1,7591.001,759
2,606.00Tree Well8470.1085
Total21,224 0.96 20,4620.04818847
Minimum
DMA Area
(ft2)
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
L31
IMP Sizing
Factor
L32 IMP Sizing
Factor
Minimum
DMA Area
(ft2)
L33
Proposed
DMA Area
(ft2)
L34 IMP Sizing
Factor
Proposed
DMA Area
(ft2)
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
DMA Calculations
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
RoadwayAC11,6811.0011,681Curb Length=494 lf
GUELandscape1,0910.10109Spacing=20o.c.
Sidewalk/
Curb PCC3,3201.003,320
ParkwayPCC3,0391.003,039
3,795.00Tree Well7560.1076
Total19,887 0.92 18,2240.04729756
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
Curb Length=840 lf
GUELandscape1,7130.10171Spacing=18o.c.
Sidewalk/
Curb PCC5,0931.005,093
RoadwayAC & PCC25,3751.0025,375
ParkwayPCC4,8371.004,837
6,289.00Tree Well1,4520.10145
Total38,470 0.93 35,6220.041,4251,452
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
Curb Length=837 lf
Sidewalk/
Curb PCC9,3921.009,392Spacing=16o.c.
Roadway AC & PCC25,3701.0025,370
ParkwayPCC4,6661.004,666
6,269.00Tree Well1,6030.10160
Total41,031 0.96 39,5880.041,5841,603
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
No. of Lots = 43ea
RoadwayAC41,5391.0041,539 Curb length = 2,443lf
GUELandscape5,0660.10507Spacing =72o.c.
Sidewalk/
Curb PCC14,3251.0014,325
ParkwayPCC5,8051.005,805
Landscape10,0170.101,002
18,372.00Bio-Swale2,5500.10255
Total79,302 0.80 63,4320.042,5372,550
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
L36
IMP Sizing
Factor
L38
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
L35
Proposed
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
L37
IMP Sizing
Factor
DMA Calculations
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
No. of Lots = 0ea
RoadwayAC4,7231.004,723 Curb length = 112lf
GUELandscape2510.1025Spacing =56o.c.
Sidewalk/
Curb PCC1,1161.001,116
ParkwayPCC01.000
Landscape4820.1048
827.00Bio-Swale3450.1035
Total6,917 0.86 5,9470.04238345
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
No. of Lots = 13ea
RoadwayAC14,7171.0014,717 Curb length = 814lf
GUELandscape1,6290.10163Spacing =136o.c.
Sidewalk/
Curb PCC4,8811.004,881
ParkwayPCC1,7551.001,755
Landscape3,2570.10326
6,047.00Bio-Swale1,0350.10104
Total27,274 0.80 21,9450.048781,035
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
No. of Lots = 0ea
RoadwayAC5,4241.005,424 Curb length = 163lf
GUELandscape3660.1037Spacing =81o.c.
Sidewalk/
Curb PCC1,3831.001,383
ParkwayPCC01.000
Landscape8660.1087
1,211.00Bio-Swale3450.1035
Total8,384 0.83 6,9650.04279345
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
No. of Lots = 35ea
RoadwayAC29,8281.0029,828 Curb length = 1,869lf
GUELandscape3,7800.10378Spacing =170o.c.
Sidewalk/
Curb PCC10,7761.0010,776
ParkwayPCC4,7251.004,725
Landscape7,3700.10737
13,992.00Bio-Swale1,8980.10190
Total58,376 0.80 46,6340.041,8651,898
Minimum
DMA Area
(ft2)
Minimum
DMA Area
(ft2)
L39
IMP Sizing
Factor
IMP Sizing
Factor
L42
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
L40
L41
Proposed
DMA Area
(ft2)
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
DMA Calculations
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
No. of Lots = 16ea
RoadwayAC13,8221.0013,822 Curb length = 859lf
GUELandscape1,7410.10174Spacing =143o.c.
Sidewalk/
Curb PCC5,1831.005,183
ParkwayPCC2,1601.002,160
Landscape3,2150.10322
6,410.00Bio-Swale1,0350.10104
Total27,156 0.80 21,7640.048711,035
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
No. of Lots = 5ea
RoadwayAC5,0161.005,016 Curb length = 288lf
GUELandscape7020.1070Spacing =144o.c.
Sidewalk/
Curb PCC2,1991.002,199
ParkwayPCC6751.00675
Landscape1,2200.10122
2,240.00Bio-Swale3450.1035
Total10,157 0.80 8,1170.04325345
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
No. of Lots = 28ea
RoadwayAC32,2561.0032,256 Curb length = 1,711lf
GUELandscape3,5500.10355Spacing =156o.c.
Sidewalk/
Curb PCC10,0311.0010,031
ParkwayPCC3,7801.003,780
Landscape7,2380.10724
12,915.00Bio-Swale1,8980.10190
Total58,752 0.81 47,3360.041,8931,898
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
No. of Lots = 0ea
RoadwayAC3,1401.003,140 Curb length = 196lf
GUELandscape4330.1043Spacing =98o.c.
Sidewalk/
Curb PCC1,6791.001,679
ParkwayPCC01.000
Landscape1,1160.10112
1,461.00Bio-Swale3450.1035
Total6,713 0.75 5,0080.04200345
L44
L43
L45
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
L46
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
DMA Calculations
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
No. of Lots = 0ea
RoadwayAC4,5321.004,532 Curb length = 194lf
GUELandscape4400.1044Spacing =97o.c.
Sidewalk/
Curb PCC1,5711.001,571
ParkwayPCC01.000
Landscape1,0970.10110
1,442.00Bio-Swale3450.1035
Total7,985 0.79 6,2910.04252345
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
No. of Lots = 10ea
RoadwayAC7,4241.007,424 Curb length = 389lf
GUELandscape8660.1087Spacing =130o.c.
Sidewalk/
Curb PCC2,7171.002,717
ParkwayPCC1,3501.001,350
Landscape1,0790.10108
2,946.00Bio-Swale5180.1052
Total13,953 0.84 11,7370.04469518
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
No. of Lots = 19ea
RoadwayAC19,2421.0019,242 Curb length = 936lf
GUELandscape1,9620.10196Spacing =134o.c.
Sidewalk/
Curb PCC5,7231.005,723
ParkwayPCC2,5651.002,565
Landscape3,2830.10328
7,055.00Bio-Swale1,2080.10121
Total33,982 0.83 28,1750.041,1271,208
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
No. of Lots = 5ea
RoadwayAC10,8321.0010,832 Curb length = 585lf
GUELandscape1,2040.10120Spacing =146o.c.
Sidewalk/
Curb PCC3,6721.003,672
ParkwayPCC6751.00675
Landscape2,9970.10300
4,362.00Bio-Swale6900.1069
Total20,070 0.78 15,6680.04627690
L48
L49
L47
L50
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
DMA Calculations
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
No. of Lots = 13ea
RoadwayAC16,7331.0016,733 Curb length = 959lf
GUELandscape1,9570.10196Spacing =160o.c.
Sidewalk/
Curb PCC5,7421.005,742
ParkwayPCC1,7551.001,755
Landscape4,3890.10439
7,179.00Bio-Swale1,0350.10104
Total31,611 0.79 24,9680.049991,035
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
No. of Lots = 25ea
RoadwayAC25,4991.0025,499 Curb length = 1,442lf
GUELandscape3,0200.10302Spacing =160o.c.
Sidewalk/
Curb PCC8,5351.008,535
ParkwayPCC3,3751.003,375
Landscape5,9680.10597
10,895.00Bio-Swale1,5530.10155
Total47,949 0.80 38,4630.041,5391,553
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
No. of Lots = 9ea
RoadwayAC13,8691.0013,869 Curb length = 647lf
GUELandscape1,3370.10134Spacing =129o.c.
Sidewalk/
Curb PCC3,9901.003,990
ParkwayPCC1,2151.001,215
Landscape2,7560.10276
4,833.00Bio-Swale8630.1086
Total24,029 0.81 19,5700.04783863
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
No. of Lots = 0ea
RoadwayAC5,4751.005,475 Curb length = 63lf
GUELandscape1670.1017Spacing =31o.c.
Sidewalk/
Curb PCC8191.00819
ParkwayPCC01.000
Landscape1180.1012
463.00Bio-Swale3450.1035
Total6,924 0.92 6,3570.04254345
L52
L53
L51
L54
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
Minimum
DMA Area
(ft2)
IMP Sizing
Factor
DMA Calculations
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
No. of Lots = 24ea
RoadwayAC27,2401.0027,240 Curb length = 1,489lf
GUELandscape3,5490.10355Spacing =149o.c.
Sidewalk/
Curb PCC8,7101.008,710
ParkwayPCC3,2401.003,240
Landscape6,2240.10622
11,189.00Bio-Swale1,7250.10173
Total50,688 0.80 40,3400.041,6141,725
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
No. of Lots = 16ea
RoadwayAC16,6921.0016,692 Curb length = 985lf
GUELandscape2,0350.10204Spacing =164o.c.
Sidewalk/
Curb PCC5,9871.005,987
ParkwayPCC2,1601.002,160
Landscape4,1910.10419
7,386.00Bio-Swale1,0350.10104
Total32,100 0.80 25,5650.041,0231,035
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
No. of Lots = 0ea
RoadwayAC4,1251.004,125 Curb length = 190lf
GUELandscape4340.1043Spacing =95o.c.
Sidewalk/
Curb PCC1,5921.001,592
ParkwayPCC01.000
Landscape1,0710.10107
1,416.00Bio-Swale3450.1035
Total7,567 0.78 5,9020.04236345
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
No. of Lots = 3ea
RoadwayAC4,3661.004,366 Curb length = 183lf
GUELandscape4050.1041Spacing =92o.c.
Sidewalk/
Curb PCC1,4691.001,469
ParkwayPCC4051.00405
Landscape6070.1061
1,357.00Bio-Swale3450.1035
Total7,597 0.84 6,3760.04255345
L56
L57
L55
L58
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
DMA Calculations
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
No. of Lots = 4ea
RoadwayAC4,4581.004,458 Curb length = 202lf
GUELandscape4540.1045Spacing =101o.c.
Sidewalk/
Curb PCC1,5761.001,576
ParkwayPCC5401.00540
Landscape6270.1063
1,512.00Bio-Swale3450.1035
Total8,000 0.84 6,7170.04269345
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
No. of Lots = 24ea
RoadwayAC25,0941.0025,094 Curb length = 1,403lf
GUELandscape3,0200.10302Spacing =156o.c.
Sidewalk/
Curb PCC8,4961.008,496
ParkwayPCC3,2401.003,240
Landscape5,8900.10589
10,682.00Bio-Swale1,5530.10155
Total47,292 0.80 37,8760.041,5151,553
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
No. of Lots = 29ea
RoadwayAC29,1081.0029,108 Curb length = 1,709lf
GUELandscape3,5020.10350Spacing =155o.c.
Sidewalk/
Curb PCC9,7411.009,741
ParkwayPCC3,9151.003,915
Landscape7,0720.10707
12,884.00Bio-Swale1,8980.10190
Total55,235 0.80 44,0110.041,7601,898
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
No. of Lots = 7ea
RoadwayAC7,9791.007,979 Curb length = 468lf
GUELandscape9750.1098Spacing =156o.c.
Sidewalk/
Curb PCC3,0641.003,064
ParkwayPCC9451.00945
Landscape2,0250.10202
3,487.00Bio-Swale5180.1052
Total15,505 0.80 12,3400.04494518
L61
L60
L62
L59
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
DMA Calculations
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
No. of Lots = 0ea
RoadwayAC3,9031.003,903 Curb length = 179lf
GUELandscape3990.1040Spacing =89o.c.
Sidewalk/
Curb PCC1,4601.001,460
ParkwayPCC01.000
Landscape9850.1099
1,330.00Bio-Swale3450.1035
Total7,092 0.78 5,5360.04221345
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
No. of Lots = 6ea
RoadwayAC4,9861.004,986 Curb length = 256lf
GUELandscape6380.1064Spacing =128o.c.
Sidewalk/
Curb PCC2,0571.002,057
ParkwayPCC8101.00810
Landscape8460.1085
2,001.00Bio-Swale3450.1035
Total9,682 0.83 8,0360.04321345
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
No. of Lots = 9ea
RoadwayAC13,4341.0013,434 Curb length = 623lf
GUELandscape1,2880.10129Spacing =125o.c.
Sidewalk/
Curb PCC3,9231.003,923
ParkwayPCC1,2151.001,215
Landscape2,5890.10259
4,666.00Bio-Swale8630.1086
Total23,311 0.82 19,0460.04762863
L63
L65
L64
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
DMA Calculations
DMA
Name
DMA
Description
Post-Project
Surface Type
Area
(ft2)
Runoff
Factor
Area x
Runoff Factor
(ft2)
No. of Lots = 0ea
RoadwayAC3,1481.003,148 Curb length = 108lf
GUELandscape2390.1024Spacing =108o.c.
Sidewalk/
Curb PCC8451.00845
ParkwayPCC01.000
Landscape6440.1064
816.00Bio-Swale1730.1017
Total5,048 0.81 4,0990.04164173
47.70acres
41.89acres
1.74acres
4.2%
Total area tributary to Bio-Retention IMPs:
Total Bio-Retention IMPArea:
x Runoff Factor:
L66
of Total effective impervious area tributary to Bio-Retention
IMPs
IMP Sizing
Factor
Minimum
DMA Area
(ft2)
Proposed
DMA Area
(ft2)
Appendix D
8-9
RECORDING REQUESTED BY,
AND WHEN RECORDED
MAIL TO:
CITY OF CHULA VISTA
CITY CLERK
276 FOURTH AVENUE
CHULA VISTA, CA 91910
No transfer tax is due as this is a
conveyance to a public agency of less
than a fee interest for which no cash
consideration has been paid or received
For Recorder’s Use Only
File No. _________
STORM WATER MANAGEMENT FACILITIES MAINTENANCE
AGREEMENT WITH GRANT OF ACCESS AND COVENANTS
(Insert Project Reference Numbers)
DEFINITIONS
“Agreement” means this Storm Water Facilities Maintenance Agreement with
Grant of Access and Covenants.
“Best Management Practices, or BMPs” means structural or non-structural
pollution prevention measures, such as site design, source control, and treatment
control methods required to minimize polluted runoff from the development during the
post-development phase of the project. BMPs include, but are not limited to, Storm
Water Management Facilities.
“City” means the City of Chula Vista, an official of the City, or any designated
staff member acting on behalf of the City. The City Council, in Resolution No. _______
dated _____________, has authorized the City Engineer to sign this Agreement on
behalf of the City.
“Inspection, Operation, and Maintenance Plan, or IOMP” means a description of
inspection, operation, and maintenance activities and schedules required to ensure
proper operation and effectiveness of the SWMFs into perpetuity, as required in the
Chula Vista Development Storm Water Manual. A copy of the IOMP, as amended from
time-to-time, shall be included in the Water Quality Technical Report for the project
before issuance of a construction permit, and a copy shall be maintained on file with the
office of the City Engineer. City may require amendments to the IOMP at its sole
discretion.
Enter project address – Project No.8-10
“Owner” means the owner of Property signatory to this Agreement applying for a
development or redevelopment project that includes permanent BMPs, and all Owner’s
successors in interest in Property, jointly (such as a Home Owners’ Association) and/or
individually.
“Property” means the property on which development is proposed, a legal
description of which is attached herewith as Exhibit B.
“Responsible Party” means Owner and any other person, corporation, or legal
entity accepting, in writing and in City approved form, responsibility on behalf of Owner.
“Security” means any Bond, Cash Deposit, or Letter of Credit that City may
require from Owner as a result of Owner’s failure to effectively maintain development’s
SWMFs, and is to assure the faithful performance of the obligations of this Agreement.
“Storm Water Management Facilities” (“SWMFs”) means all onsite and offsite
structural facilities constructed for the treatment of project’s storm water runoff,
proposed as part of the development project submittals, as approved by City prior to the
issuance of a development permit, or as amended with City’s approval after the
development is complete.
AGREEMENT
This Agreement for the inspection, maintenance, and repair of certain Storm
Water Management Facilities is entered into between ___________________________
(“Owner”) and City for the benefit of City, Owner, successors in interest to City or
Owner, and the public generally.
Pursuant to City’s urban runoff regulations, including Chula Vista Municipal
Code, Chapter 14.20 (the “Storm Water Management and Discharge Control
Ordinance) and the Chula Vista Development Storm Water Manual, Owner has
prepared and submitted to City a Water Quality Technical Report (“WQTR”), which is on
file in the office of the City Engineer. The WQTR proposes that storm water runoff from
Property be detained and treated by the use of permanent SWMFs which are identified
in the WQTR as Treatment Control BMPs.
The WQTR specifies the manner and standards by which the SWMFs must be
inspected, maintained, and repaired in order to retain their effectiveness. City requires
Owner to enter into Agreement for the installation, inspection, maintenance, and repair
of permanent SWMFs prior to the issuance of construction permits by City for work on
Property (Improvements). It is the purpose of this Agreement to assure that the SWMFs
are inspected, maintained, and repaired by creating obligations which are enforceable
against Owner. Owner hereby covenants and agrees with City as follows:
1. Maintenance of Storm Water Management Facilities. Owner shall
install, inspect, maintain, repair, and replace all SWMFs for the Improvements as
required by the Director of Public Works, or his/her designated representative
(“Director). Maintenance shall include inspection and servicing of SWMFs on the
Enter project address – Project No.8-11
schedule determined necessary to ensure the SWMFs retain their effectiveness. Owner
shall maintain, repair and replace the SWMFs until all obligations under this Agreement
are transferred to, and assumed by, another owner or entity, satisfactory to City. Owner
shall grant Responsible Party assuming any obligation under this Agreement all
necessary access right. Owner shall include a copy of the Inspection, Operation, and
Maintenance Plan (“IOMP”) for the SWMFs in the WQTR for the project and submit a
copy to City, at the time this Agreement is executed.
The IOMP shall describe employee training programs and duties, routine inspection,
service and operating schedules, maintenance frequency, and specific maintenance
activities. Through the IOMP, Owner may also designate a Responsible Party,
satisfactory to City, to maintain the BMPs. The IOMP may be amended from time-to-
time by Owner, subject to City approval. Owner shall also be responsible for amending
the IOMP upon City’s direction.
2. Record Keeping. The designation of a Responsible Party to maintain the
SWMFs does not relieve Owner of any of the obligations or duties under this
Agreement. Owner, its successors, or a designated Responsible Party, shall retain
records of the IOMP and maintenance and inspection activities for at least five years.
Said records shall be made available within 5 days, upon request by City.
3. Defense and Indemnity. Owner agrees to defend, indemnify, protect,
and hold harmless City, its agents, officers and employees, from and against all claims,
demands, causes of action, liability or loss asserted or established for damages or
injuries to any person or property arising out of the installation, inspection, maintenance,
repair, or replacement of the BMPs. Claims, demands, causes of action, liability or loss
that arise from, are connected with, or are caused or claimed to be caused by the acts
or omission of Owner, Owner’s agents, officers and employees are covered.
Also covered are the claims, demands, causes of action, liability or loss arising from,
connected with, caused by, or claimed to be caused by the active or passive negligent
acts or omissions of City, its agents, officers, or employees which may be in
combination with the negligence of Owner, its employees, agents or officers, or any
third party. Owner’s duty to defend, indemnify, protect and hold harmless shall not
include any claims or liabilities arising from the established sole negligence or sole
willful misconduct of City, its agents, officers or employees.
Owner further agrees that indemnification referred to above and the duty to defend City
requires Owner to pay any costs City incurs that are associated with enforcing the
indemnification provision, and defending any claims arising from the installation,
inspection, maintenance, repair, or replacement of the SWMFs. If City elects, at its sole
discretion, to conduct its own defense, participate in its own defense, or obtain
independent legal counsel in defense on any claim related to the installation, inspection,
maintenance, repair or replacement of the SWMFs, Owner agrees to pay the
reasonable value of attorney’s fees and all of City’s reasonable costs.
4. Insurance. Owner shall maintain a policy of liability insurance, as
required by and in an amount approved by, City. This policy, with City named as an
Enter project address – Project No.8-12
additional insured, will protect City from any potential claims, which may arise from the
installation, inspection, maintenance, repair or replacement of the SWMFs.
5.Notices. Owner agrees that it shall, prior to transferring ownership of any
land on which any of the SWMFs covered by this Agreement are located, and also prior
to transferring ownership of any such SWMFs, provide clear written notice of the above
maintenance obligations associated with that SWMF to the transferee. Owner further
agrees to provide evidence that Owner has requested the California Department of Real
Estate to include in the public report issued for the development of Property, a
notification regarding the SWMF maintenance requirements described in this
Agreement.
6.CITY’s Right to Perform Maintenance. It is agreed that City shall have
the right, but not the obligation, to elect to perform any or all of the maintenance
activities if, in City’s sole judgment, Owner has failed, after a five-day written notice
(from the date of postmark or personal delivery) has been provided by City to Owner, to
perform the maintenance as agreed. In cases where immediate threat to water quality
is imminent, a five-day notice will not be required. If City performs any of the
maintenance activities, after City has first (1) served notice to Owner in accordance with
the provisions of Chula Vista Municipal Code Chapter 1.40 to perform the maintenance
activities and (2) Owner has failed to do so within the reasonable time stated in City’s
notice, then Owner shall pay all City costs incurred in performing said maintenance
activities. Owner’s obligation to pay City’s costs of performing maintenance activities is
a continuing obligation and shall apply whether or not City has required or used all or
any portion of Security provided pursuant to Paragraph 8.
7.Grant of Access. City will conduct inspections of the SWMFs from time-
to-time as required by the National Pollutant Discharge Elimination System Municipal
Permit, Order No. R9-2007-0001 and any re-issuances thereof, to ensure adequate
maintenance and effectiveness of the SWMFs. Owner grants to City a perpetual
access to the SWMFs for performing inspections or any of the maintenance activities
specified in paragraph 1. City shall have the right, at any time and without prior notice to
Owner, to enter upon any part of Property as may be necessary or convenient for
inspection purposes. Owner shall at all times maintain Property so as to make City’s
access clear and unobstructed. Owner agrees to pay all inspection fees as may be
established by City.
8.Security. If upon two inspections within any five-year period, City
inspectors determine that Owner has failed to effectively operate, maintain, or repair the
SWMFs, City may require Owner to provide City with Security to assure the faithful
performance of the obligations of this Agreement. Security may be in the form of a
Bond, a Cash Deposit, or a Letter of Credit in an amount equal to two-years’ cost of
maintaining the SWMFs, as determined in the project WQTR and adjusted at 5% per
annum. City may use Security to provide funding for the cost to City to perform any of
the maintenance activities for the development’s SWMFs. City may use all or any part
of Security at any time pursuant to this Agreement. Should any portion of Security be
used by City, Owner shall deposit additional funds or provide an additional Letter of
Credit to City within thirty (30) days in the amount used by City to bring the amount
available back up to the amount specified. If Security is a Cash Deposit, and a
Enter project address – Project No.8-13
Substitute Cash Deposit or Letter of Credit is provided that is acceptable to City, any
amount of the Cash Deposit not used by City shall be returned to Owner in accordance
with City’s accounting procedures. The Letter of Credit shall be submitted on bank
letterhead using City-approved form.Once Owner has demonstrated effective
operation, maintenance, and repair, as determined by City, the Security shall be kept for
one year for the first occurrence, and two years for the second occurrence, after which
time the Security shall be cancelled and any unused funds returned to Owner.
9.Agreement Binds Successors and Runs with PROPERTY. It is
understood and agreed that the terms, covenants and conditions contained in this
Agreement shall constitute covenants running with the land and shall be binding upon
the heirs, executors, administrators, successors and assigns of Owner and City and
shall be deemed to be for the benefit of all persons owning any interest in Property. It is
the intent of the parties that this Agreement be recorded and be binding upon all
persons purchasing or otherwise acquiring all or any lot, unit or other portion of
Property, who shall be deemed to have consented to and become bound by all the
provisions of this Agreement. This Agreement shall commence upon execution of this
Agreement by all parties named in the Agreement.
10. Enforcement. Failure to comply with the terms of this Agreement
constitutes a violation of the Chula Vista Municipal Code Chapter 14.20 “Storm Water
Management and Discharge Control” and may result in enforcement action pursuant to
City’s storm water regulations and administrative procedures.
11. Governing Law and Severability. This Agreement shall be
governed by the laws of the State of California. Venue in any action related to this
Agreement shall be in the Superior Court of the State of California, County of San
Diego, South County Division. In the event that any of the provisions of this Agreement
are held to be unenforceable or invalid by any court of competent jurisdiction, the
validity, and enforceability of the remaining provisions shall not be affected by the
judgment.
Enter project address – Project No.8-14
SIGNATURE PAGE FOR
STORM WATER MANAGEMENT FACILITIES MAINTENANCE
AGREEMENT WITH GRANT OF ACCESS AND COVENANTS
(Insert Project Reference Numbers)
IN WITNESS WHEREOF, the parties have executed this Agreement on the
day of , 20__.
OWNER:CITY OF CHULA VISTA:
By:
Its:
By:
Its:
City Engineer
APPROVED AS TO FORM:
City Attorney
ATTEST:
City Clerk
Dated:
(Notary to attach acknowledgment for each signature.)
(Corporate Authority required for each Signatory, if applicable.)
Attachments:
Exhibit A: Legal Description for Property
Appendix E
Appendix F
Inspection, Operation, and Maintenance Plan
Otay Ranch
Village 8 West
Chula Vista Tract No. 09-xx
Prepared By
Hale Engineering
7910 Convoy Court
San Diego, CA 92111
(858) 715-1420
Prepared For
Otay Land Company, LLC
1903 Wright Place, Suite 220
Carlsbad, CA 92008
(760) 602-3777
Original Date: March 26, 2009
Revised:February 3, 2011
Table of Contents
1 Introduction..................................................................................................... 1
2 Designated ResponsiblePart.......................................................................... 1
3 Employee Training .......................................................................................... 1
4 Inspection and Maintenance ........................................................................... 2
4.1 Swale Bioretention BMPs.......................................................................... 2
4.2 Tree Well Bioretention BMPs .................................................................... 3
4.3 Landscaping .............................................................................................. 4
4.4 Miscellaneous Activities ............................................................................ 5
5 Record Keeping .............................................................................................. 5
Appendix
Appendix A Sample Maintenance Agreement
Appendix B Sample Inspection and Maintenance Forms
1
1 Introduction
Per Section 3.VI.3 of the City of Chula Vista Development Storm Water Manual,
this Inspection, Operation, and Maintenance Plan (IOMP) describes
responsibilities and actions necessary to ensure the proper function of the
proposed project BMPs.
2 Designated Responsible Part
The provision of the fiscal resources necessary to ensure the proper adherence to
this Inspection, Operation, and Maintenance Plan and to ensure the water quality
of the storm water discharged from the project site shall be the responsibility of:
Otay Land Company, LLC
1903 Wright Place, Suite 220
Carlsbad, CA 92008
(760) 602-3777
Otay Land Company, LLC shall create a Landscape Maintenance District (LMD).
Maintenance of the project BMPs shall be amongst the responsibilities of the
LMD. The LMD shall ensure ongoing long-term maintenance of all structural
BMPs and provide verification of maintenance requirements through such means
as may be appropriate, at the discretion of the City of Chula Vista.
3 Employee Training
Responsible persons shall be trained within a month of hire, and shall receive a
minimum of one review session annually. A training log shall be provided and
shall be filled out at each training session. The records of training shall be kept a
minimum of five (5) years.
A sample inspection log is included in Appendix B. The Inspection Log provides a
list of the specific inspection tasks to be carried out. Copies of the Inspection Log
shall be provided and filled out after each inspection. The inspection records shall
be kept a minimum of five (5) years.
A maintenance log shall be provided and filled out for all maintenance activities.
The records shall be kept for a minimum of five (5) years. A sample of the
maintenance log sheet is shown in Appendix B.
2
4 Inspection and Maintenance
Proper inspection and maintenance is imperative for BMP effectiveness and
longevity. All BMPs shall be maintained to provide optimum effectiveness in
accordance with industry standards, with annual maintenance to be conducted
prior to October 1st. The maintenance program for site BMPs is as follows:
4.1 Swale Bioretention BMPs
Inspection
Bioretention BMPS shall be inspected monthly, or after large storm events, and
after removal of accumulated debris or material. Based upon the conditions
observed in the inspection, corrective maintenance shall be performed in
accordance with the guidelines set forth below.
Inspection of the bioretention BMPs shall include a visual inspection of the
general condition of the vegetation and irrigation operation interval.
Preventative Maintenance
The BMP shall be maintained and irrigated in a manner that promotes plant health
and good coverage. The health of the vegetation shall be evaluated twice
annually; all dead and diseased vegetation shall be removed and replaced.
Weeding of vegetation shall be done as needed to promote a neat and orderly
appearance.
Trash and debris shall be removed and properly disposed of before the wet
season and as needed.
The use of fertilizers, herbicides and pesticides shall be done in accordance with
all applicable federal, state and local regulations as well as the manufacturer’s
specifications. Landscape waste shall be disposed of by use of a solid waste
container and shall be transported off-site to the appropriate facility.
Corrective Maintenance
If it is determined, based on site conditions or the condition of the bioretention
BMPs, that the maintenance interval is infrequent enough for proper operation as
a BMP, the inspection schedule shall be reevaluated and a revised schedule shall
be implemented.
Any dead or diseased plants shall be removed and replaced with an appropriate
equal as needed, to ensure the proper operation as a BMP.
Sediment shall be removed such that there is no clogging or blockage of the filter
material as soon as is practical.
Faulty operation of storm drain overflow pipes resulting in a condition detrimental
to the water quality environment shall be corrected as soon as is practical.
3
Faulty operation of irrigation appurtenances resulting in a condition detrimental to
the water quality environment shall be corrected as soon as is practical.
Irrigation run-off shall not be allowed. Irrigation controllers shall be regulated in a
manner that does not allow for significant landscape irrigation water run-off.
4.2 Tree Well Bioretention BMPs
Inspection
Tree wells shall be inspected monthly, or after large storm events, and after
removal of accumulated debris or material. Based upon the conditions observed
in the inspection, corrective maintenance shall be performed in accordance with
the guidelines set forth below.
Inspection of the tree wells shall include a visual inspection of the general
condition of the vegetation, mulch, planting mix, and irrigation operation interval.
Preventative Maintenance
The tree well shall be maintained and irrigated in a manner that promotes tree
health and good coverage. The health of the tree and vegetation shall be
evaluated twice annually; all dead and diseased vegetation and/or trees shall be
removed and replaced. Weeding of vegetation and tree pruning shall be done as
needed to promote a neat and orderly appearance. Mulch shall be replaced as
needed to provide an even appearance and a depth of 3 inches. Planting mix
shall be replenished before the wet season and as needed.
Trash and debris shall be removed and properly disposed of before the wet
season and as needed.
The use of fertilizers, herbicides and pesticides shall be done in accordance with
all applicable federal, state and local regulations as well as the manufacturer’s
specifications. Landscape waste shall be disposed of by use of a solid waste
container and shall be transported off-site to the appropriate facility.
Corrective Maintenance
If it is determined, based on site conditions or the condition of the tree well, that
the maintenance interval is infrequent enough for proper operation as a BMP, the
inspection schedule shall be reevaluated and a revised schedule shall be
implemented.
Any dead or diseased plants shall be removed and replaced with an appropriate
equal as needed, to ensure the proper operation as a BMP.
Sediment shall be removed such that there is no clogging or blockage of the
drainage system.
4
Faulty operation of storm drain overflow pipes resulting in a condition detrimental
to the water quality environment shall be corrected as soon as is practical.
Faulty operation of irrigation appurtenances resulting in a condition detrimental to
the water quality environment shall be corrected as soon as is practical.
Irrigation run-off shall not be allowed. Irrigation controllers shall be regulated in a
manner that does not allow for significant landscape irrigation water run-off.
4.3 Landscaping
Inspection
Landscaping shall be inspected monthly, or after large storm events, and after
removal of accumulated debris or material. Based upon the conditions observed
in the inspection, corrective maintenance shall be performed in accordance with
the guidelines set forth below.
Inspection of the landscaping shall include a visual inspection of the general
condition of the vegetation and irrigation operation interval.
Preventative Maintenance
All vegetated areas are to be maintained and irrigated in a manner that promotes
plant health and good coverage. The health of the vegetation shall be evaluated
twice annually; all dead and diseased vegetation shall be removed and replaced.
In the event that erosion becomes evident, the maintenance activity shall include
stabilization of the area, a reevaluation of the design and the formulation of a
solution for the proper performance of the BMP.
Trash and debris shall be removed and properly disposed of before the wet
season and as needed.
The use of fertilizers, herbicides and pesticides shall be done in accordance with
all applicable federal, state and local regulations as well as the manufacturer’s
specifications. Landscape waste shall be disposed of by use of a solid waste
container and shall be transported off-site to the appropriate facility.
Landscape irrigation run-off shall not be allowed. Irrigation controllers shall be
regulated in a manner that does not allow for significant landscape irrigation water
run-off.
Corrective Maintenance
If it is determined, based on site conditions or the condition of the landscaping,
that the inspection interval is infrequent enough for proper operation as a BMP,
the maintenance schedule shall be reevaluated and a revised schedule shall be
implemented.
Any dead or diseased plants shall be removed and replaced with an appropriate
equal as needed, to ensure the proper operation as a BMP.
5
Faulty operation of irrigation appurtenances resulting in a condition detrimental to
the
4.4 Miscellaneous Activities
Storm Drain Stenciling and Signage- Storm drain stencils shall be inspected
annually at a minimum for legibility. In the event that stencils and/or signs become
illegible, they shall be repainted or replaced as soon as is practical.
5 Record Keeping
The LMD shall complete and maintain all necessary IOMP forms to document all
maintenance requirements. All records shall be retained for at least 5 years and
shall be available to the City for inspection upon request at any time.
Appendix A
8-9
RECORDING REQUESTED BY,
AND WHEN RECORDED
MAIL TO:
CITY OF CHULA VISTA
CITY CLERK
276 FOURTH AVENUE
CHULA VISTA, CA 91910
No transfer tax is due as this is a
conveyance to a public agency of less
than a fee interest for which no cash
consideration has been paid or received
For Recorder’s Use Only
File No. _________
STORM WATER MANAGEMENT FACILITIES MAINTENANCE
AGREEMENT WITH GRANT OF ACCESS AND COVENANTS
(Insert Project Reference Numbers)
DEFINITIONS
“Agreement” means this Storm Water Facilities Maintenance Agreement with
Grant of Access and Covenants.
“Best Management Practices, or BMPs” means structural or non-structural
pollution prevention measures, such as site design, source control, and treatment
control methods required to minimize polluted runoff from the development during the
post-development phase of the project. BMPs include, but are not limited to, Storm
Water Management Facilities.
“City” means the City of Chula Vista, an official of the City, or any designated
staff member acting on behalf of the City. The City Council, in Resolution No. _______
dated _____________, has authorized the City Engineer to sign this Agreement on
behalf of the City.
“Inspection, Operation, and Maintenance Plan, or IOMP” means a description of
inspection, operation, and maintenance activities and schedules required to ensure
proper operation and effectiveness of the SWMFs into perpetuity, as required in the
Chula Vista Development Storm Water Manual. A copy of the IOMP, as amended from
time-to-time, shall be included in the Water Quality Technical Report for the project
before issuance of a construction permit, and a copy shall be maintained on file with the
office of the City Engineer. City may require amendments to the IOMP at its sole
discretion.
Enter project address – Project No.8-10
“Owner” means the owner of Property signatory to this Agreement applying for a
development or redevelopment project that includes permanent BMPs, and all Owner’s
successors in interest in Property, jointly (such as a Home Owners’ Association) and/or
individually.
“Property” means the property on which development is proposed, a legal
description of which is attached herewith as Exhibit B.
“Responsible Party” means Owner and any other person, corporation, or legal
entity accepting, in writing and in City approved form, responsibility on behalf of Owner.
“Security” means any Bond, Cash Deposit, or Letter of Credit that City may
require from Owner as a result of Owner’s failure to effectively maintain development’s
SWMFs, and is to assure the faithful performance of the obligations of this Agreement.
“Storm Water Management Facilities” (“SWMFs”) means all onsite and offsite
structural facilities constructed for the treatment of project’s storm water runoff,
proposed as part of the development project submittals, as approved by City prior to the
issuance of a development permit, or as amended with City’s approval after the
development is complete.
AGREEMENT
This Agreement for the inspection, maintenance, and repair of certain Storm
Water Management Facilities is entered into between ___________________________
(“Owner”) and City for the benefit of City, Owner, successors in interest to City or
Owner, and the public generally.
Pursuant to City’s urban runoff regulations, including Chula Vista Municipal
Code, Chapter 14.20 (the “Storm Water Management and Discharge Control
Ordinance) and the Chula Vista Development Storm Water Manual, Owner has
prepared and submitted to City a Water Quality Technical Report (“WQTR”), which is on
file in the office of the City Engineer. The WQTR proposes that storm water runoff from
Property be detained and treated by the use of permanent SWMFs which are identified
in the WQTR as Treatment Control BMPs.
The WQTR specifies the manner and standards by which the SWMFs must be
inspected, maintained, and repaired in order to retain their effectiveness. City requires
Owner to enter into Agreement for the installation, inspection, maintenance, and repair
of permanent SWMFs prior to the issuance of construction permits by City for work on
Property (Improvements). It is the purpose of this Agreement to assure that the SWMFs
are inspected, maintained, and repaired by creating obligations which are enforceable
against Owner. Owner hereby covenants and agrees with City as follows:
1. Maintenance of Storm Water Management Facilities. Owner shall
install, inspect, maintain, repair, and replace all SWMFs for the Improvements as
required by the Director of Public Works, or his/her designated representative
(“Director). Maintenance shall include inspection and servicing of SWMFs on the
Enter project address – Project No.8-11
schedule determined necessary to ensure the SWMFs retain their effectiveness. Owner
shall maintain, repair and replace the SWMFs until all obligations under this Agreement
are transferred to, and assumed by, another owner or entity, satisfactory to City. Owner
shall grant Responsible Party assuming any obligation under this Agreement all
necessary access right. Owner shall include a copy of the Inspection, Operation, and
Maintenance Plan (“IOMP”) for the SWMFs in the WQTR for the project and submit a
copy to City, at the time this Agreement is executed.
The IOMP shall describe employee training programs and duties, routine inspection,
service and operating schedules, maintenance frequency, and specific maintenance
activities. Through the IOMP, Owner may also designate a Responsible Party,
satisfactory to City, to maintain the BMPs. The IOMP may be amended from time-to-
time by Owner, subject to City approval. Owner shall also be responsible for amending
the IOMP upon City’s direction.
2. Record Keeping. The designation of a Responsible Party to maintain the
SWMFs does not relieve Owner of any of the obligations or duties under this
Agreement. Owner, its successors, or a designated Responsible Party, shall retain
records of the IOMP and maintenance and inspection activities for at least five years.
Said records shall be made available within 5 days, upon request by City.
3. Defense and Indemnity. Owner agrees to defend, indemnify, protect,
and hold harmless City, its agents, officers and employees, from and against all claims,
demands, causes of action, liability or loss asserted or established for damages or
injuries to any person or property arising out of the installation, inspection, maintenance,
repair, or replacement of the BMPs. Claims, demands, causes of action, liability or loss
that arise from, are connected with, or are caused or claimed to be caused by the acts
or omission of Owner, Owner’s agents, officers and employees are covered.
Also covered are the claims, demands, causes of action, liability or loss arising from,
connected with, caused by, or claimed to be caused by the active or passive negligent
acts or omissions of City, its agents, officers, or employees which may be in
combination with the negligence of Owner, its employees, agents or officers, or any
third party. Owner’s duty to defend, indemnify, protect and hold harmless shall not
include any claims or liabilities arising from the established sole negligence or sole
willful misconduct of City, its agents, officers or employees.
Owner further agrees that indemnification referred to above and the duty to defend City
requires Owner to pay any costs City incurs that are associated with enforcing the
indemnification provision, and defending any claims arising from the installation,
inspection, maintenance, repair, or replacement of the SWMFs. If City elects, at its sole
discretion, to conduct its own defense, participate in its own defense, or obtain
independent legal counsel in defense on any claim related to the installation, inspection,
maintenance, repair or replacement of the SWMFs, Owner agrees to pay the
reasonable value of attorney’s fees and all of City’s reasonable costs.
4. Insurance. Owner shall maintain a policy of liability insurance, as
required by and in an amount approved by, City. This policy, with City named as an
Enter project address – Project No.8-12
additional insured, will protect City from any potential claims, which may arise from the
installation, inspection, maintenance, repair or replacement of the SWMFs.
5.Notices. Owner agrees that it shall, prior to transferring ownership of any
land on which any of the SWMFs covered by this Agreement are located, and also prior
to transferring ownership of any such SWMFs, provide clear written notice of the above
maintenance obligations associated with that SWMF to the transferee. Owner further
agrees to provide evidence that Owner has requested the California Department of Real
Estate to include in the public report issued for the development of Property, a
notification regarding the SWMF maintenance requirements described in this
Agreement.
6.CITY’s Right to Perform Maintenance. It is agreed that City shall have
the right, but not the obligation, to elect to perform any or all of the maintenance
activities if, in City’s sole judgment, Owner has failed, after a five-day written notice
(from the date of postmark or personal delivery) has been provided by City to Owner, to
perform the maintenance as agreed. In cases where immediate threat to water quality
is imminent, a five-day notice will not be required. If City performs any of the
maintenance activities, after City has first (1) served notice to Owner in accordance with
the provisions of Chula Vista Municipal Code Chapter 1.40 to perform the maintenance
activities and (2) Owner has failed to do so within the reasonable time stated in City’s
notice, then Owner shall pay all City costs incurred in performing said maintenance
activities. Owner’s obligation to pay City’s costs of performing maintenance activities is
a continuing obligation and shall apply whether or not City has required or used all or
any portion of Security provided pursuant to Paragraph 8.
7.Grant of Access. City will conduct inspections of the SWMFs from time-
to-time as required by the National Pollutant Discharge Elimination System Municipal
Permit, Order No. R9-2007-0001 and any re-issuances thereof, to ensure adequate
maintenance and effectiveness of the SWMFs. Owner grants to City a perpetual
access to the SWMFs for performing inspections or any of the maintenance activities
specified in paragraph 1. City shall have the right, at any time and without prior notice to
Owner, to enter upon any part of Property as may be necessary or convenient for
inspection purposes. Owner shall at all times maintain Property so as to make City’s
access clear and unobstructed. Owner agrees to pay all inspection fees as may be
established by City.
8.Security. If upon two inspections within any five-year period, City
inspectors determine that Owner has failed to effectively operate, maintain, or repair the
SWMFs, City may require Owner to provide City with Security to assure the faithful
performance of the obligations of this Agreement. Security may be in the form of a
Bond, a Cash Deposit, or a Letter of Credit in an amount equal to two-years’ cost of
maintaining the SWMFs, as determined in the project WQTR and adjusted at 5% per
annum. City may use Security to provide funding for the cost to City to perform any of
the maintenance activities for the development’s SWMFs. City may use all or any part
of Security at any time pursuant to this Agreement. Should any portion of Security be
used by City, Owner shall deposit additional funds or provide an additional Letter of
Credit to City within thirty (30) days in the amount used by City to bring the amount
available back up to the amount specified. If Security is a Cash Deposit, and a
Enter project address – Project No.8-13
Substitute Cash Deposit or Letter of Credit is provided that is acceptable to City, any
amount of the Cash Deposit not used by City shall be returned to Owner in accordance
with City’s accounting procedures. The Letter of Credit shall be submitted on bank
letterhead using City-approved form.Once Owner has demonstrated effective
operation, maintenance, and repair, as determined by City, the Security shall be kept for
one year for the first occurrence, and two years for the second occurrence, after which
time the Security shall be cancelled and any unused funds returned to Owner.
9.Agreement Binds Successors and Runs with PROPERTY. It is
understood and agreed that the terms, covenants and conditions contained in this
Agreement shall constitute covenants running with the land and shall be binding upon
the heirs, executors, administrators, successors and assigns of Owner and City and
shall be deemed to be for the benefit of all persons owning any interest in Property. It is
the intent of the parties that this Agreement be recorded and be binding upon all
persons purchasing or otherwise acquiring all or any lot, unit or other portion of
Property, who shall be deemed to have consented to and become bound by all the
provisions of this Agreement. This Agreement shall commence upon execution of this
Agreement by all parties named in the Agreement.
10. Enforcement. Failure to comply with the terms of this Agreement
constitutes a violation of the Chula Vista Municipal Code Chapter 14.20 “Storm Water
Management and Discharge Control” and may result in enforcement action pursuant to
City’s storm water regulations and administrative procedures.
11. Governing Law and Severability. This Agreement shall be
governed by the laws of the State of California. Venue in any action related to this
Agreement shall be in the Superior Court of the State of California, County of San
Diego, South County Division. In the event that any of the provisions of this Agreement
are held to be unenforceable or invalid by any court of competent jurisdiction, the
validity, and enforceability of the remaining provisions shall not be affected by the
judgment.
Enter project address – Project No.8-14
SIGNATURE PAGE FOR
STORM WATER MANAGEMENT FACILITIES MAINTENANCE
AGREEMENT WITH GRANT OF ACCESS AND COVENANTS
(Insert Project Reference Numbers)
IN WITNESS WHEREOF, the parties have executed this Agreement on the
day of , 20__.
OWNER:CITY OF CHULA VISTA:
By:
Its:
By:
Its:
City Engineer
APPROVED AS TO FORM:
City Attorney
ATTEST:
City Clerk
Dated:
(Notary to attach acknowledgment for each signature.)
(Corporate Authority required for each Signatory, if applicable.)
Attachments:
Exhibit A: Legal Description for Property
Appendix B
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Employee Training Log
Training Type:
Instructor:Date:
Company:
Attendees
Name Signature Name Signature
Site Inspection Log
Maintenance Engineer/Company:
Date:
Reason for Inspection:
Inspection Item A M U N/A
Corrective
Action
Required
I. Landscaping
Are grounds in good condition, clean and free of debris?
Are lawn areas mowed and trimmed?
Are plant beds and/or planter boxes well maintained?
Are shrubs trimmed and maintained?
Are dead trees or shrubs evident?
Are lawn sprinkler systems operable?
Are areas around trash receptacles clean?
Do a sufficient quantity of receptacles exist?
II. Hardscape
Are sidewalks and trails in good condition, clean, and free of
debris?
III. Storm Drain System
Are all stencils in good condition, visible and legible?
Are all drains clean and free of obstructions?
IV. Bioretention BMPs
Is the BMP in good condition, clean and free of debris?
Is the BMP free of burrows?
Is the BMP free of sediment accumulation?
Is the BMP free of standing water
V. Tree Wells
Is the Tree Well in good condition, clean and free of debris?
Is the vegetation healthy and the planter mix at a proper depth?
Is the BMP free of sediment accumulation?
Is the BMP free of standing water?
Comments:
A Acceptable M Marginal U Unacceptable N/A Not Applicable