HomeMy WebLinkAbout03.a. CCWD Expenditure for Conco/Maltby REW Leak3.a.
Central Contra Costa Sanitary District
August 1, 2014
TO: FINANCE COMMITTEE
VIA: ROGER S. BAILEY, GENERAL MANAGER
DAVID HEATH, DIRECTOR OF ADMINISTRA N 1W
JEAN -MARC PETIT, DIRECTOR OF ENGINEERING -,-J—v1,p
FROM: THEA VASSALLO, FINANCE MANAGER Li
SUBJECT: ADDITIONAL REQUESTED INFORMATION REGARDING
EXPENDITURE TO CONTRA COSTA WATER DISTRICT (CCWD) FOR
REPAIRS ASSOCIATED WITH THE CONCO /MALTBY RECYCLED
WATER LEAK
At the July 21, 2014 Finance Committee meeting, the Committee requested additional
information regarding Check #200556 dated 6/19/14 for $9,414.14 that was issued to
the Contra Costa Water District (CCWD) for repairs associated with the 2.5 million
gallon Conco /Maltby four -inch recycled water leak. Attached is a breakdown of the
labor hours associated with the repair.
Collection System Operations Division Manager Paul Seitz stated that, for comparison
purposes, he worked with Accounting staff to estimate the cost using the District's rates
for labor and equipment. They found the costs to be comparable. It cost $9,414.14 for
CCWD to perform the work which would have cost CCCSD $11,347.66 to do. Attached
is the CCCSD job cost estimate.
Provisional Senior Engineer Nathan Hodges provided the following summary:
Leak was discovered February 18 when District staff observed a significant
amount of standing water in the area immediately north of the BNSF rail and
south of Conco's concrete plant. This is an undeveloped area and marsh -like
(see attached).
Leak was from the District's 4" PVC REW line that parallels the force main out of
the Maltby Pump Station. The break was on a segment of line adjacent to the
force main junction structure.
Duration of leak was estimated at 82 days and a volume of 2.4 million
gallons. Looking at flow data, the leak developed slowly with volumes not
sufficient enough to be observed. It was not until near the time of the leak report
when leak volumes were significant (see attached).
N:WDMINSUPWDMIN\DIST- SEC\ COMMITTEES \Finance\2014\Attachments \CCWD REW Invoice Followup 08- 01- 14.docx
• CCWD was brought in under the maintenance agreement to make a
repair. Significant excavation effort was required to find the exact location of the
leak, deal with saturated soil, and chip out concrete near the junction
structure. A sloped excavation was used due to soil conditions and timing so no
shoring was employed. After the repair, sufficient cure time was required for the
weld solvents. Later, concrete for the thrust blocking was poured.
Staff will be available at the August 1, 2014 Finance Committee meeting to answer
questions.
Attachments
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N:\ADMINSUP\ADMIN \DIST- SEC\ COMMITTEES \Finance\2014Wttachments \CCWD REW Invoice Followup 08-01 -1 4.docx
JUL. 23.20'4 4: 19PM CONTRA COSTA WATER DISTRICT- N0, 674—P
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1331 Concord Ave"Ue
PO Box H2O
Concord, CA 94524
FACOMME TRAMMMAL
Main number- (925) 688-8000
Main FAX, (925) 886-8122
www-Guwater-com
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COBEMENT:
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JUL.23.2014 4 :19PM CONTRA COSTA WATER DISTRICT
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CCCSD Re. claim, ed Water
Al` CONTRA COSTA
WATER QIS'rRICT
Complaint
Site
Service Address
X Street
Customer Name
Telephone
Meter Location
ME Inquiry Q Other.
5050 Jaahoff
Waterbird Way Map Page:
Received by
Job Account # 101 TUB-2922
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Action
NO. 614 . 2
Date Received; 2/.20/2014
Time Received:
Order Number.
Section: 4113
Description 4` Leak Repair '._
Crew Members C.L. MSEO MSIEO U.W.
Flours 2/21 6 6 6 6
2/24 6 . 6 6 6
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Done Time=
Work Done By: Fisher, Coley„ Leff le, Esskew Am-tu_al Firs:
Begin Date: 2/21/2014 Done Date: 44W Crew Size:
Contacted Customer D Work Order Complete? Tot Labor Hrs:
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