HomeMy WebLinkAboutReso 1977-8712RESOLUTION NO. 8712
RESOLUTION OF THE CITY COUNCIL OF THE CITY OF CHULA
VISTA ADOPTING GUIDELINES FOR THE ALIGN~'1ENT AND
TYPICAL SECTION FOR TELEGRAPH CANYON ROAD AND FOR
THE TYPES OF CHANNEL BETWEEN CREST/OLEANDER AND THE
EASTERLY CITY LIMITS
The City Council of the City of Chula Vista does hereby
resolve as follows:
WHEREAS, the City Council of the City of Chula Vista has
heretofore entered into an agreement with Wilsey & Ham for the
preparation of conceptual plans for the development of Telegraph
Canyon Road and drainage channel, and
WHEREAS, said study and EIR have now been received, and
WHEREAS, the Director of Public Works recommends the
following action:
1. Adoption of guidelines for the alignment, grade, and
sections for Telegraph Canyon Road and Channel.
2. Formalization of the alignment through preparation
of a Record of Survey Pap.
3. Adoption of a seed mix design to be used as a guide
for landscaping the channel.
4. Adoption of design flood flows to be used for the
design of future flood control facilities.
5. Designation that certain measures will be undertaken
to mitigate noise impacts and possible damage to
archaeological sites. These mitigating measures are
to be included in appropriate project construction
specifications.
NOW, THEREFORE, BE IT RESOLVED that the City Council of the
City of Chula Vista does hereby approve the recommendations of the
Director of Public Works and adopts the guidelines as presented in
Exhibit "A", attached hereto and incorporated herein by reference
as if set forth in full.
Presented by
Approved as to form by
W. J. Robens, Director of Public Georg~'D. Lindberg, City AttoYney
works
ADOPTED AND APPROVED BY THE CITY COUNCIL OF THE CITY OF
CHULA VISTA, CALIFORNIA , this 12th day of July
197 ~ by the following vote, to-wit:
AYES: Councilmen Scott, Egdahl, xobel, Cox, Hyde
NAYES: Councilmen None
ABSTAIN: Councilmen None
ABSENT: Councilmen None
W~~
Mayor of the City of
ATTES "
City Jerk
STATE OF CALIFORNIA )
COUNTY OF SAN DIEGO ) s s .
CITY OF CHULA VISTA )
I, JENNIE M. FULASZ, CMC, CITY CLERK of the City of Chula Vista, California,
DO HEREBY CERTIFY that the above and foregoing is a full, true and correct copy of
,and that the same has not been amended or repealed.
DATED
(seal)
City Clerk
CC-660
To:
Via:
From:
Subject:
June 29, 1977
File No. AY 011
Lane F. Cole, City Manager
Gene Asmus, Assistant City Manager
Bill Robens, Director of Public Works
Telegraph Canyon Highway/Channel Plan Adoption
PURPOSE/DESCRIPTION
EXHIBIT
~..._
The purpose of this report is to set forth the staff's recommendation
for the alignment and typical section for Telegraph Canyon Road and
for the types of channel to be utilized between Crest/Olenader and
the easterly City limits.
RECOMMENDATION
Based on the Design Report for Telegraph Canyon Road and Channel pre-
pared by Wilsey and Ham and the related EIR, it is recommended that
the City Council:
1. Adopt the alignment and grade for Telegraph Canyon Road and the
alignment, grade and sections for Telegraph Canyon Channel as shown
on Drawings 77-40D through 77-49D on file in the Department of
Public Works to be used as a guideline for development within
Telegraph Canyon from Oleander Avenue to the easterly City limits.
2. Designate that the seed specifications shown in the "Design Report
for Telegraph Canyon Road and Channel" by Wilsey and Ham be used
as a guide for the landscaping of the unlined channel sections and
outside cut and fill slopes, except that each of the seed mixes
shall be modified to include 10 pounds per acre of Trifolium hykon-
inoculated.
3 Designate the typical road section as shown in Exhibit A (alter-
nate #2) to be used as the ultimate roadway section for Telegraph
Canyon Road between Oleander Avenue and the easterly City limits.
4. Direct the staff to formalize the alignment of Telegraph Canyon
Road between Oleander Avenue and the easterly City limits through
the preparation of a Record of Survey Map. (Note monies for such
work have already been budgeted - GT-49).
5. Adopt the design flows for a 50-year ultimate storm for Telegraph
Canyon Creek as developed in a report entitled "A Special Study
of Storm Drainage Facilities," by Lawrence, Fogg, Florer and Smith,
dated June 1964 for design of future flood control facilities
in Telegraph Canyon east of Oleander Avenue.
6. Designate that noise generated by the anticipated traffic on
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Telegraph Canyon Road be mitigated within habitable areas in future
developments through separation by distance, the use of shielding,
landscaping, walls, and building orientation. For portions con-
structed under City contracts, construction noise may be mitigated
in a number of different ways, including the use of properly muffled
equipment; restriction of construction activity to the hours between
7:30 a.m. and 4:30 p.m.; selecting the quietest of alternate items
of equipment (e.g., hydraulic instead of pneumatic); scheduling
of equipment operations to maintain a low average noise level by
coinciding noisiest operations with times of highest ambient levels
and turning off idling equipment. These measures shall all be in-
corporated into appropriate project's construction specifications.
7. Designate that archaeological field investigations and salvage
operations within both of the archaeological sites located within
the immediate vicinity of the project will be required and are
expected to reduce the impact of the project on these resources
to an insignificant level. In addition, construction specifications
shall provide that instructions be given to work crews to ensure
that heavy equipment or storage materials are not moved through
or upon the archaeological sites to ensure that valuable archae-
ological resources are not damaged or impaired by the proposed
project.
BACKGROUND/PROCEDURE
1. Actions to date:
By resolution No. 7345, the City Council approved an agreement
with Wilsey and Ham for the preparation of conceptual plans for ;
Telegraph Canyon Road and Channel. Major reasons for the prepara-
tion of these plans were the need for coordinated road, channel
and sewer facilities in the valley in order to permit logical
development of adjacent lands, and to assure that the construction
would not destroy the natural character of the valley.
During the preparation of the conceptual plans by Wilsey and Ham
the City prepared EIR No. 76-12 relating to the alignment and
widening of Telegraph Canyon Road and associated drainage improve-
ments. This EIR was certified by Council Resolution No. 8560 on
March 29, 1977.
By Resolution No. 8586, the City Council on April 19, 1977 accepted
the work done by Wilsey and Ham.
On May 17, 1977, a public hearing was held to obtain public input
on the improvement of highway and channel facilities in Telegraph
Canyon from Crest Drive to the easterly City limits. However, no
public input was made. The Council then referred the matter to
the staff for their recommendation as to appropriate action.
2. Subsequent Requirements:
a. The guidelines set forth in the Consultant's report will be most
effectively implemented if formally adopted by the City Council.
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Such adoption will:
1. Permit coordination of piecemeal development.
2. Permit improvement of less-than-ultimate section (4 lanes)
which will "fit" into the ultimate improvement.
3. Provide a basis to determine ultimate cost and equitable
distribution of that cost.
b. Formalization of Alignment
The Consultant's report sets forth a general depiction of an
alignment which by design will cause minimal disruption of the
natural appearance of the canyon. However, because of the limi-
ted number of established property corners and other survey
monuments in the vicinity there is a need to precisely establish
the relationship of the proposed alignment and the various pro-
perties through which it passes. In recognition of this need,
via Resolution 7979, the City Council approved funds for "Tele-
graph Canyon Road, I-805 to Otay Lakes Road, preparation of
R/W maps." Preparation of a record of survey will mathematically
fix the alignment and make such information a public record.
Such work is proposed to be undertaken immediately following
adoption of the guidelines.
c. Incorporation of Mitigating Measures
As a result of the City's Environmental Review Policy, mitiga-
ting measures identified in the EIR must be included in the
construction of the various segments of the project. Specific
items to be so included are discussed herein.
DISCUSSION
1. Description of Alternates Studied
a. Drainage Channel
Nine various methods of accommodating storm flows were studied
by the Consultant:
1) Trapezoidal Channel - with grassy lining
2) Trapezoidal Channel - with heavy landscaping
3) Trapezoidal Channel - with low flow channel and grassy
lining
4) Trapezoidal Channel - with rip-rap on side adjacent to
highway
5) Trapezoidal Channel - with gunite lining
6) Rectangular Concrete Channel
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7) Multi Plate Super Span
8) Multi Pipe
9) Reinforced Concrete Box
Included as Exhibit C is a table taken from the "Design
Report" showing cost comparisons for these various channel
sections.
b. Road Alignment
The consultant evaluated the alignment of Telegraph Canyon
Road as proposed by Staff and suggested some refinements.
The Conceptual Plan incorporates some of the various alterna-
tive ideas studied. Because Telegraph Canyon is so narrow
there was only one viable basic alignment available. Alterna-
tives studied represented only minor variations of that basic
alignment.
c. Summary of Consultant's Work
The Executive Summary as prepared by the Consultant is in-
cluded in this report as Exhibit B. It summarizes the work,
conclusions, and recommendations made by the Consultant.
2. Description of Ultimate Improvements Suggested by Consultant:
The proposed alignment and grade for Telegraph Canyon Road and
Channel, and the channel sections as recommended are the result
of work performed by Wilsey and Ham. This work has previously
been furnished to the Council. A brief description of the ultimate
improvements suggested by the Consultant is as follows:
a. Roadway/Alignment
The ultimate improvement involves the construction of Telegraph
Canyon Road as a prime arterial (6 lanes) divided roadway.
See Exhibit A (alternate 2) for typical Roadway Section. The
alignment of the highway will be generally similar to the
existing roadway but some sharp curves will be flattened out.
The design is such as to minimize the amount of grading.
The ultimate improvement will necessitate the acquisition
and/or relocation of several residences and/or structures along
its length. Two are located just easterly of Oleander Avenue
and the others are in the vicinity of Buena Vista Way.
b. Channel
The two channel types proposed include a lined trapezoidal channel
and a natural channel landscaped with drought resistant plant
material. Landscaping is not intended to create a park like
scene. The landscaped section is proposed to be used through
most of the project reach. These channel types are the two
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least expensive of the channel types studied in terms of total
construction and maintenance costs.
The maintenance cost for the heavily landscaped channel will
be almost twice that of the gunite channel. Conversely, the
construction cost for the gunite channel is about twice that
of the heavily landscaped channel. The landscaped alternative
has been chosen for general use because it will be more aesthet-
ically appealing. The subject portion of Telegraph Canyon
Road has been designated as a scenic highway. Utilization
of the landscaped section will preserve the character of the
valley as much as possible.
Irrigation of the landscaping is expected to be required for
only 1 or 2 years to allow the plants to become established.
Maintenance of the channel after that time will consist pri-
marily of clearing the area of trash and debris, and occasionally
trimming or thinning the plant life.
3. Specific Modifications to Consultant's Work as Proposed by Staff.
a. Landscaping
The Wilsey and Ham report recommended seed mix specifications
for the channel and slopes. The seed mixes were reviewed by
the Park and Recreation Department and the City's Landscape
Architect. The Landscape Architect recommended that the species
"Trifolium hykon-inoculated" be included in the various design
mixes. The amount to be included is 10 pounds of seed per
acre.
This seed is a fast germinating plant that will provide an
initial ground cover to minimize erosion and help prevent
the washing away of other seeds prior to germination. Staff
therefore recommends modification of the seed mix as specified.
b. Typical Street Section
On March 15, 1977, the City Council accepted a report recom-
mending the utilization of bicycle lanes in preference to
bicycle paths on Telegraph Canyon Road east of I-805. Exhibit A
includes a copy of this report. The bicycle lanes require
a slightly wider pavement area but do not affect the overall
right of way width for the road.
4. EIR Considerations
a. Regulations
An Environmental Impact Report was prepared for this project
by the City staff and subsequently certified by the City Council.
As a result of the City's Environmental Review Policy, mitigating
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measures identified in this EIR must be included in the con-
struction of the various segments of the project.
The "Environmental Review Policy" was adopted by Resolution
No. 8493. The following are excerpted from Section 5.7 and
Section 5.8 of that policy:
"No decision making body shall approve or carry out a
project for which an Environmental Impact Report has
been completed which identifies one or more significant
effects of the project unless the body makes one or more
of the following written findings for each of those sig-
nificant effects, accompanied by a statement of the facts
supporting each finding.
1. Changes or alterations have been required in, or incor-
porated into, the project which mitigate or avoid the
significant environmental effects thereof as identified
in the final EIR.
2. Such changes or alterations are within the responsibility
and jurisdiction of another public agency and not the
body making the finding. Such changes have been adopted
by such other agency or can and should be adopted by
such other agency.
3. Specific economic, social, or other considerations
make infeasible the mitigation measures or project
alternatives identified in the final EIR.
The findings required by this subsection shall be supported
by substantial evidence in the record.
The findings in subsection 2 shall not be made if the agency
making the findings has concurrent jurisdiction with another
agency to deal with identified feasible mitigation measures
or alternatives.
5.8 Statement of Overriding Considerations. If the decision
making body decides to approve a project for which serious
adverse environmental consequences have been identified in
the EIR, the body shall issue a statement identifying the
other interests on which approval is based. Adverse con-
sequences which have been mitigated need not be addressed
in this statement. The statement shall be attached to the
Notice of Determination and be incorporated as part of the
final EIR."
b. Significant Impacts
The recommended project was described in EIR 76-12 as having
the following environmental impacts:
1) Improved drainage facilities in the downstream portions of
the Telegraph Canyon drainage basin are generally nonexistent
or inadequate. Development in the area tributary to these
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drainage areas and construction of a formal drainage facil-
ity will both tend to increase the volumes of storm water
reaching these downstream areas.
c.
2) Grading necessary to accommodate the proposed improvements
will result in a substantial land form change in Telegraph
Canyon.
3) The project will result in adverse noise impacts both insofar
as temporary construction noise and long term traffic noise
are concerned.
4) The project is anticipated to have significant direct and
secondary impacts on the native flora and fauna of Telegraph
Canyon .
5) Two archaeological sites are in the immediate vicinity of the
project. Either or both of the sites could be disturbed or
damaged by the project.
6) Implementation of the project will play a major role in the
erosion of the current aesthetic value of Telegraph Canyon.
7) Implementation of the project will provide adequate access to
much of the eastern Chula Vista area. Such access will accom-
modate urbanization of this area and indirectly induce in-
creased runoff, destroy natural habitat, reduce open space
and increase the demand for urban services.
Mitigation Measures
Respective mitigation measures which are proposed to be incorpo-
rated in the project include the following:
1) From a point approximately 2770 feet easterly of Crest Drive
to Rutgers Avenue the Telegraph Canyon channel is proposed to
be graded to a trapezoidal section and be heavily landscaped.
This treatment is anticipated to provide an adequate water way
for flood waters while simultaneously minimizing the velocity
of the water as compared to that which would exist in a lined
channel. In this manner flood peaks in the downstream reaches
will be much the same as if the natural channel still existed.
2) The channel size and roadway width are to a large degree pre-
determined by anticipated loadings. However, the horizontal
alignment of channel and roadway has been adjusted in such a
manner as to minimize possible impacts on the land form within
the canyon. This consideration resulted in the grade and
alignment depicted on Drawings 77-40D through 77-49D on file
in the Department of Public Works.
In accordance with the City's Grading Ordinance, new slopes
created as a result of this project will be landscaped. This
slope landscaping together witYi the landscaping of the channel,
the landscaped median and parkways along the road will enhance
the Canyon's appearance. Landscaping materials have been
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selected so as to blend into the natural appearance of, the
Canyon, thus further mitigating the land••form'changes of
the Canyon. •
3) Noise generated by the anticipated traffic on Telegraph
Canyon Road will be mitigated within habitable areas in
future developments through separation by distance, the
use of shielding, landscaping, walls and building orienta-
tion. For portions constructed under City contracts, con-
struction noise will be mitigated in a number of different
ways, including the use of properly muffled equipment;
restriction of construction activity to the hours between
7:30 a.m. and 4:30 p.m.; selecting the quietest of alter-
nate items of equipment (e.g., hydraulic instead of pneu-
matic); scheduling of equipment operations to maintain a
low average noise level by coinciding noisiest operations
with times of highest ambient levels and turning off idling
equipment. These measures will all be incorporated into
the project's construction specifications.
4) The proposed landscaping throughout the length of the project
is expected to be of significant mitigational value on
the direct and indirect impacts on the native flora and
fauna of Telegraph Canyon. It will provide compensatory
nesting sites and serve to some extent to reduce fire
hazards. However, since a potential for growth inducement
is associated with project implementation, the greater impact
to the Canyon's biology is expected to occur after project
construction as secondary impacts for which no mitigation
appears feasible.
5) Archaeological field investigations and salvage operations
within both of the archaeological sites located within the
immediate vicinity of the project will be required and are
expected to reduce the impact of the project on these
resources to an insignificant level. In addition, construc-
tion specifications will provide that instructions be given
to work crews to ensure that heavy equipment or storage
materials are not moved through or upon the sites. Avoidance
of the general area of the archaeological sites will ensure
that valuable archaeological resources are not damaged or
impaired by the proposed project.
6) The measure proposed with this project intended to mitigate
the aesthetic impact of the project on Telegraph Canyon
is that of installing landscaping throughout the project's
limits (road median and parkway landscaping and channel
lining). The proposed road and channel alignment has taken
into consideration the minimization of grading and slope
creation. However, the construction of a paved road and
a trapezoidal channel cannot altogether be mitigated.
7) There are no feasible measures that can be incorporated
in this project which will mitigate the growth impact
associated with its implementation. The construction of
the road and a drainage channel will have the effect of
increasing the potential for development of areas within
and adjacent to Telegraph Canyon by providing easier access
to these properties. However, if this project is not
undertaken, the development of these properties would not
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be precluded. Sewer, water, telephone, gas and electric
facilities of adequate capacity to serve most of these areas
are presently available. The proper exercise of land use con-
trols will play a bigger part in the growth of the areas which
are served by the project than will the project itself.
Since the project, if implemented, is expected to be constructed
on a piece-meal basis, the rate of growth in the area will regu-
late the demand for its construction.
The impacts and mitigation measures listed above were derived
and formulated for the recommended project in the spirit of CEQA.
The project as recommended is a result of a comprehensive study
based on environmental concerns and need of the project. The
unavoidable environmental concerns have been identified, evalu-
ated and measures which mitigate anticipated impacts promulgated.
These measures will be made a part of the project specifications.
5. County Comments and Concerns:
The County was supplied with the conceptual plan and related docu-
ments, and was requested to conduct a review and make comment as
deemed appropritate.
County staff responded by letter dated June 7, 1977 and made no
significant comments.
6. Hydrology:
As part of the contract for preparation of conceptual plans for
Telegraph Canyon Road and Channel, Wilsey and Ham made a hydrologic
analysis of the entire basin upstream of Oleander Avenue. Both
present and ultimate quantities of runoff from a 50 year period of
frequency storm were estimated and compared with estimates made by
the Lawrence, Fogg, Florer and Smith study in 1964 and a recent Corps
of Engineers study.
The results of the three studies varied significantly due to the
use of different methodologies.
After considerable study by both Wilsy and Ham and City staff, it
was decided to base design flows on the Lawrence, Fogg, Florer and
Smith study so as to achieve consistency in design in both upper and
lower reaches of the canyon.
Since many existing storm drain facilities throughout the City
have been designed using the Lawrence, Fogg, Florer, and Smith design
flows, the entire city-wide system will remain consistent.
SUMMARY/CONCLUSIONS
A conceptual plan for roadway and :channel improvements in Telegraph Canyon
has been prepared by a consultant engineering firm. Staff recommends
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that such conceptual plan with specified modifications be formally
adopted through Council action so as to serve as a guideline for future
development.
Primary features of the plan are:
1. Preservation of the natural appearance of the canyon to the maximum
degree possible through grading and landscaping techniques.
2. Creation of a vehicle to permit coordination of staged or piece-
meal development.
It is necessary that certain mitigating measures be included in the
requirements for any future projects along the subject portion of
Telegraph Canyon. These measures include mitigation of noise and
archaeological investigations.
In order to formalize the alignment proposed it will be necessary to
prepare a Record of Survey.
SLH:et