HomeMy WebLinkAboutAgenda Statement 1986/10/28 Item 13COUNCIL AGENDA STATEMENT
Item 13
Meeting Date 10/28/86
ITEM TITLE: Resolution la ~~ ~ Approving Change Order No. One, Eastlake
Assessment District 85-2, Contract 111A and authorizing the
City Engineer to execute
SUBMITTED BY: Director of Public Works/City Engineer
REVIEWED BY: City Manager (4/5ths Vote: Yes No X )
The City Council by Resolution 12471 awarded to Olson Construction Company
Contract 111A of the Eastlake Assessment District 85-2 for Otay Lakes Road,
sewer and water improvements. The contract is dated June 10, 1986. The City
has prepared Change Order No. One in the amount of $48,016.15.
RECOMI~~ENDATION: That Council adopt resolution
1. Approving Change Order No. One.
2. Granting 45 calendar day time extension.
3. Authorizing the City Engineer to execute the Change Order on behalf of the
c; ty .
BOARDS/COMMISSIONS RECOMMENDATION: Not applicable.
DISCUSSION:
Olson Construction Company has started construction of the off-site 15" sewer
main to serve the Eastlake Business Park. The off-site sewer main connects to
an existing manhole located on Otay Lakes Road adjacent to the entry into the
Otay Lakes Lodge P~lobile Home Park. It continues easterly along the Telegraph
Canyon Creek to the Business Park for a distance of approximately 3450 lineal
feet. About 2000 lineal feet of the sewer is actually within the drainage way
and varies in depth from 10 to 17 feet. Ground water was discovered at an
elevation 6 to 7 feet above the flow line of the sewer line. Further
investigation showed that this condition existed for approximately 1900 feet,
along the sewer line to be constructed.
The groundwater condition and the method used to dewater resulted in only 80
feet of sewer being constructed over a five-day period. The subgrade was
unstable and the trench walls kept caving and sliding, creating an
unsatisfactory working condition. The City inspection staff directed the
contractor to stop work in that area and move his operation easterly to more
firmer ground until the site conditions were further investigated and a
solution to the construction problems was determined.
Several meetings were held with the Assessment District Consultants and
Eastlake Development Company. San Diego Geotechnical Consultants, Inc. was
retained by Eastlake Development to provide supplemental engineering geology
and soils engineering data to evaluate sub-surface conditions encountered for
a possible redesign of the sewer line and appurtenances.
Page.2, Item 13
Meeting Date/~6
The report has been completed and based upon the recommendations contained
therein, the sewer design was modified as follows:
1. Sewer pipe was changed to a more rigid and stronger material to withstand
yvdrostatic pressures and potential settlement.
2. Depth of bedding was increased from 4" to 18".
3. An engineering fabric is added to envelop the bedding and pipe zone
materials.
4. The pipe was raised slightly to compensate for settlement of the soils
surrounding the pipe which is expected to occur when the fill is placed
for Otay Lakes Road.
The change in design was required because of the presence of ground water
and alluvial type soils surrounding the pipe.
The additional cost to perform the work required by the redesign of the sewer
is estimated at $44,000.00. The unit costs are shown on the attached contract
change order.
An additional double luminaire light standard has been added to the contract
which increases the number of light standards from 10 to 11 within the median
island on Otay Lakes Road. This requires an additional 115 feet of conduit
and wiring and one more pull box. The increase in cost for the street
lighting system is estimated at $4016.15.
The total change order cost is estimated at $48,016.15. or 1.9% of the total
contract.
We arp also recommending a 45 calendar day extension of time due to these
changes. If approved, the contract completion date will change from
November 21, 1986, to January 5, 1987.
Eastlake Development Co. supports the approval of this change order. They
have been very helpful and given assistance in the resolution of the problems.
The construction plans and specifications were prepared by the developer's
engineer, Rick Engineer Company. No geotechnical or soils investigation was
made along the proposed alignment of the sewer on Otay Lakes Road. The plans
were checked through the normal subdivision process, whereby these types of
problems are the responsibility of the developer to correct when discovered
during construction. Since the sewer is financed by an Assessment District,
it still is the ultimate responsibility of the developer/homeowner and not the
general city taxpayer. The amount is well with the contingency left in the
bond reserve. The in situ groundwater and soils conditions were discovered at
the time Olson Construction Company started work.
FINANCIAL STATEMENT:
Contingency funds are available from Assessment District 85-2, Contract 111A
Account #620-6203-5569. Funding for the project comes from the sale of bonds
under the "Improvement Bond Act of 1915."
FISCAL IMPACT: None.
DMN:nr/AY-0693A/WPC 2386E
by the City C;~t~ril of
Chula Vita, Ca,,~~rnia
S~ate~1 ~d ~ ~ ~.'_'-'
CHANGE IN CONTRACT
Assessment District No. 85-2
Contract IIIA, Construction of
Otay Lakes Road, Sewer and Water
Lines, and all Appurtenances CONTRACT
Olson Construction Company CONTRACTOR
vl.~,,"1 .., _. _ -J
ORDER N0. One
DATE October 21, 1986
JOB AY 069 3CA
The following change shall be made to increase the contract dated June 10,
1986, between the CIty of Chula Vista and Olson Construction Company,
Contractor.
REt+IARKS AND DETAILS:
Change in contract plans and specifications, initiated by the City of Chula
Vista at the following prices:
A. Street Lights
Item 15. Add one (1) double hung street light, conduit
wiring and appurtenances
Additional Work:
Add 115 lineal feet conduit and wiring @ $6.15/f t.
Add one (1) pull box
Change approximately 7,430 lineal feet of conductor wire to
THW, copper @ 0.18/L.F.
Change in contract price for electrical work
B. Sewer Revision, Station 9+92.95 to 28+97.3
_ $1,900.00
= 707.25
= 71 .50
= 1,337.40
_ $4,016.15
The following cost proposal shall govern the installation of 16-inch "Big
Blue" sewer pipe, manholes, appurtenances, and related work necessary for
construction of the sewer main in accordance with the revised plans for
sewer stations 9+92.95 to 28+97.3.
1. Materials:
16" Big Blue pipe, approximately 1900 L.F. @ $17.63/ft. _ $33,497.00
Return pipe charge, restocking (300 L.F. @ $5.46/ft.)x15~= 245.70
16" Flexible couplin s 10 each @ $298 each = 2,980.00
1" Rock, 500 tons @ 8.60/ton = 4,300.00
Pipe credit, 1900 L.F. @ $5.46/ft. _ (10,347.00)
~~larkup 15~ 601.30
Subtotal .
2. Return Pipe:
Equipment and labor Lump Sum = $ 352.00
P~arkup 15% equipment
Markup 20% labor 54.40
Subtotal
3. Excavate additional 14" 250 C.Y. @ $2.00/yd = $ 500.00
Place additional rock 500 tons @ $2.00/ton = 1,000.00
15% Markup 225.00
Subtotal
4. Marifi filter fabric, trench condition
14' x 1900' = 26,600 sq. ft. @ $.10/S.F. _ $ 2,660.00
15% Markup 399.00
Install Marifi 10 hrs @ $28.00/hr = 280.00
20% Plarkup 56.00
Subtotal
Total of Items $40,793.40
Contingencies 3,206.60
TOTAL $44,000.00
TOTAL PROPOSED CHANGE IN CONTRACT DUE TO THIS CHANGE ORDER:
STREET LIGHTING $ 4,016.15
SEWER REVISION 44,000.00
Through approval of this change order, the contract time is extended 45
calendar days changing the contract completion date from November 21, 1986, to
January 5, 1987.
The Contractor, Olson Construction Company, hereby agrees to furnish all
labor, tools, material and equipment to perform the above change in contract
work in accordance with the approved plans and contract specification.
ORIGINAL CONTRACT PRICE $2,532,556.00
Previous Change Orders 0
This Change Order 48,016.15
Total Contract $2,580.572.15
Council. Resolution No. Olson Construction Co.'s ;'~~
12787 g ; ~,
p
J hn P. Lipp tt w. c-~ Kenneth J' Goldkamp
ity Engineer V~~ti ~ft'P'~ Senior Civil En ine
,y,., ~-
WPC 2387E .~ Swccr~a Pe:: ~r3tE ccy:as
lea p~sPuno w.uc .r~'w+s
/~v c~u0e,o ~h+ THE Sty/E o~
TiStE C~{.~~s! Q