AGENDA
ITEM
10 OF CALENICO
AGENDA
CALEXICO California ITEM
COUNTY WHERE CALIFORNIA AND MEXICO MEET
10 CITY COUNCIL
AGENDA STAFF REPORT
DATE: December 20, 2023
TO: Mayor and City Council
APPROVED BY: Esperanza Colio Warren, Gily Manager gOnNa REVIEWED BY: Sandra L. Fonseca, Interim Finance Director D PREPARED BY: Guillermo Sillas, Director of Public Works/City Engineer SUBJECT: Authorize City Manager to Sign Change Order No. 3 with Mountain Cascade, Inc. in the Amount of $1,050,787.00 for the New River Improvement Project - Calexico Reach.
Recommendation:
Authorize City Manager to Sign Change Order No. 3 with Mountain Cascade, Inc. in the amount of $1,050,787.00 for the New River Improvement Project - Calexico Reach.
Background:
On February 15, 2023, the City Council of the City of Calexico awarded Mountain Cascade, Inc. the bid for construction services of the New River Improvement Project - Calexico Reach in the amount of $40,690,908.04. The project consists of three primary construction components:
1. Trash screen and diversion structure for the New River downstream from the International Boundary with Mexico.
Bypass encasement infrastructure for the New River from a point downstream of the International Boundary to a point downstream of the eastern boundary of the City of Calexico to address the public health threat that New River water quality poses to the southern area of the city.
3. A pump-back system to take treated wastewater from the existing Calexico Wastewater Treatment Plant (WWTP) and discharge it into the New River channel at a point near the proposed river diversion and encasement structure.
On October 4, 2023, the City Council of the City of Calexico authorized the City Manager to sign Change Order No. 1 with Mountain Cascade, Inc. in the amount of $282,500.00 and authorize City Manager to approve any future change orders not-to-exceed $610,363.62 (1.5% of Mountain Cascade, Inc. base bid) as per City Ordinance No. 1218.
Here is a list of change orders that have been approved since October 4, 2023:
# Description Amount Balance
$892,863.62
Change Order No. 1
72" CCFRFPM Pipe Freight Delivery/Mobilization
139 (Calculation Error in Bid Item) $57,500.00
New River East Access - Change of Condition from
bidding, required additional work to access east side of River for sheet piling work at NR diversion structure
C01a area, reduction of workspace area $47,042.73
Transfer Yard Clean-up of City property adjacent to
C01b Hensel Phelps property $31,754.48
Standby Time Delay for Equipment due to no
encroachment permit & Hensel Phelps property not
CO1c being available. $114,812.70
Total $251,109.91 $641,753.71
Change Order No. 2
New River East Access - Change of Condition from
bidding, required additional work to access east side of River for sheet piling work at NR diversion structure
CO2a area, reduction of workspace area $24,465.09
Transfer Yard Clean-up of City property adjacent to
C02b Hensel Phelps property $0.00
Standby Time Delay for Equipment due to no
environmental clearance & Hensel Phelps property not
C02c being available. $109,899.84
Total $134,364.93 $507,388.78
Discussion and Analysis:
On a weekly basis, the State of California Department of Water Resources, City staff, Dynamic Consulting Engineers, Inc. and Mountain Cascade, Inc. meet to discuss the construction progress of the New River Improvement Project (NRIP) - Calexico Reach. One of the NRIP projects main components is the 72-inch pipe bypass encasement infrastructure for the New River from a point downstream of the International Boundary to a point downstream of the eastern boundary of the City to address the public health threat that new River water quality poses to the southern area of the city. The pipe will be installed along the south side of the New River and will cross several feet underneath the City's two (2) main sanitary sewer lines that convey the wastewater of the City to the Wastewater Treatment Plant (WWTP). The size of the two (2) sanitary sewer lines are 18-inch and 30-inch diameter of Vitrified Clay Pipe (VCP) that were installed approximately 56 years ago when the WWTP was built. The 18-inch line was video inspected and found to be severely cracked & deteriorated. City staff is very concerned 2 that during the construction process and the running of heavy equipment around and on top of these lines the sewer lines will collapse and pose a great danger to the City.
The 30-inch sewer line was not shown on the project plans. The 18-inch sewer while shown on the plans, did not indicate its material, nor a manhole just adjacent to where the proposed 72- inch pipe bypass will be placed. The trench bottom for the 72-inch pipe will need to go approximately 21' below the 18-inch sewer line, which would need to be supported over the trench top width, even with a shoring box will be more than 20' span.
The replacement of the sewer lines is not part of the original scope of work for the NRIIP- Calexico Reach; however, the risk of collapse is such that both the City and the contractor recommend their replacement. This was supported by the design engineer in the RFl process, including review of their generic support detail for sewer crossings. They acknowledged that the old VCP sewer, with 4' joints would not be practical using this detail. The City would expect the contractor to provide a cost credit for not using this detail, which would have been required for such crossings.
Mountain Cascade, Inc. has provided a cost estimate to remove and replace both 18-inch and 30-inch line. After careful review of the proposed cost estimate, City staff is recommending that the City Council of the City of Calexico approve the following change orders:
# Description Amount
Pothole and Verify Existing Sewer Line Invert Elevation $10,346.00 2 Construction Staking $17,865.00
Temporary Sewer Bypass to Allow for Construction of 18-inch 3 Sewer Pipe and Sewer Manholes $158,402.00
4 Remove and Dispose Existing Sewer Manholes $19,958.00 5 Remove and Dispose Existing 18" VCP Sewer Pipe $107,940.00 Furnish and Install 5-ft Diameter Sewer Manhole, including 6 Manhole Coating $104,697.00
Furnish and Install 18-inch Diameter PVC Sanitary Sewer, including Trenching, Backfill and Compaction to 90% Relative 7 Compaction $60,060.00
Temporary Sewer Bypass to Allow for Construction of 30-inch 8 Sewer and Sewer Manhole $182,384.00
9 Remove and Dispose Existing 30-inch VCP $128,800.00
Furnish and Install 30-inch Diameter PVC Sanitary Sewer, including Trenching, Backfill and Compaction to 90% Relative 10 Compaction $213,360.00
Pressure Testing of Sewer Pipe, including 18-inch and 30-inch 11 Diameter Pipes $26,011.00
12 Concrete Encasement 30-inch Sewer Pipe (24-ft length of pipe) $20,964.00 Total $1,050,787.00
Fiscal Impact:
Capital Improvement Program Budgeted Item for FY 2023-2024 Revenue - Fund No. 475-91-902
DWR Grant - Construction $42,725,453.00
Sub-Total $42,725,453.00
Expenditures - Fund No. 475-91-902
Mountain Cascade, Inc. - Original Bid $40,690,908.04
Mountain Cascade, Inc. - Change Order No. 1 $251,109.91 Mountain Cascade, Inc. - Change Order No. 2 $134,364.93 Mountain Cascade, Inc. - Change Order No. 3 $1,050,787.00 Contract amount including change orders no. 1, 2 & 3 Sub-Total $42,127,169.88 Total Construction Balance ($42,725,453.00 - $42,127,169.88) $598,283.12 Please note that DWR provided the City with a five percent (5%) contingency from Mountain 52334,645.00 range order on us on phed, or said pring station on 5y balance will be $598,283.12 for any future change order requests.
Coordinated With:
California Department of Water Resources.
City Manager's Office.
Public Works Department.
Office of the City Clerk.
Attachments):
1. Mountain Cascade, Inc. Change Order No. 3.
4 CITY OF CALEXICO
PUBLIC WORKS DEPARTMENT
CHANGE ORDER NO. 3
Name of Project: New River Improvement Project - Calexico Reach
LER PAIR
CALEXICO Name of Contractor: Mountain Cascade, Inc.
assis God Trai Date: December 20, 2023
# Description Price Price Time
Increase Decrease Extension
Pothole and Verify Existing Sewer Line Invert Elevation $10,346.00 2 Construction Staking $17,865.00
Temporary Sewer Bypass to Allow for Construction of 18-inch Sewer $158,402.00
Pipe and Sewer Manholes
4 Remove and Dispose Existing Sewer Manholes $19,958.00 5 Remove and Dispose Existing 18" VCP Sewer Pipe $107,940.00 6 Furnish and Install 5-ft Diameter Sewer Manhole, including Manhole Coating $104,697.00
Furnish and Install 18-inch Diameter PVC Sanitary Sewer, including $60,060.00 Trenching, Backfill and Compaction to 90% Relative Compaction 8 Temporary Sewer Bypass to Allow for Construction of 30-inch Sewer $182,384.00
and Sewer Manhole
Remove and Dispose Existing 30-inch VCP $128,800.00
10 Furnish and Install 30-inch Diameter PVC Sanitary Sewer, including $213,360.00
Trenching, Backfill and Compaction to 90% Relative Compaction 11 Pressure Testing of Sewer Pipe, including 18-inch and 30-inch $26,011.00 Diameter Pipes
12 Concrete Encasement 30-inch Sewer Pipe (24-ft length of pipe) $20,964.00| Sub-Total $ 1,050,787.00 -
Total 1,050,787.00
Contract Amount 41,076,382.88
Total Contract Amount (Contract + Change Order No. 3) 42,127,169.88 Esperanza Colio Warren, City Manager
City of Calexico, 608 Heber Avenue, Calexico, California Carlos Beltran, Construction Manager
Dynamic Consulting Engineers, 2415 Imperial Business Park Drive, STE B, Imperial, California Michael D. Fuller, President
Mountain Cascade, Inc., 555 Exchange Court, Livermore, CA
HOUNTAIN
Proposal
PO Box 5050, Livermore, CA 94551
(925) 373-8370 Fax (925) 373-8379
TO: City of Calexico Date TBD
MCI Job# 91597 Page # 1
Contract # City of Calexico
Att'n: Mrs. Liliana Falomir Project Title New River Improvement Project Calexico Reach
TTEM DESCRIPTION QUANTITY UNIT UNIT PRICE BID TOTAL
Pothole and Verify Existing Sewer Line Invert LS
1 Elevation $10,346.00 $10,346.00
2 Construction Staking $17,865.00 $17,865.00
Temporary Sewer Bypass to Allow for
3 Construction of 18" sewer pipe and sewer 1 LS $158,402.00 $158,402.00 manholes
4 Remove and Dispose Existing Sewer Manholes 2 EA $9,979.00 $19,958.00 Remove and Dispose Existing 18" VCP Sewer
5 420 LF $257.00 $107,940.00
Pipe,
Furnish and Install 5-ft Diameter Sewer
Manhole, include manhole coating 3 EA $34,899.00 $104,697.00 Furnish and Install 18" DIA PVC Sanitary
7 Sewer, including trenching, backfill and 420 LF $143.00 $60,060.00 compaction to 90% relative compactior
8 emporary Sewer Bypass to Allow 1 1
onstruction of 30" Sewer and sewer manho LS $182,384.00 $182,384.00 9 Remove and Dispose Existing 30" VCP 560 LF $230.00 $128,800.00 Furnish and Install 30" DIA PVC Sanitary
10 Sewer, including trenching, backfill and 560 LF $381.00 $213,360.00 compaction to 90% relative compaction
11 Pressure testing of Sewer Pipes, Including 18' 1 LS $26,011.00 and 30" diameter pipes $26,011.00
12 Concrete Encasement 30" Sewer Pipe (24-fl 1 LS $20,964.00 $20,964.00 length of pipe)
TOTAL = $1,050,787.00