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THE BOARD OF SUPERVISORS OF CONTRA COSTA COUNTY, CALIFORNIA
Adopted this Order on September 18 1984 , by the following vote:
AYES: Supervisors Powers , Fanden, McPeak and Torlakson
NOES: None
ABSENT: Supervisor Schroder
ABSTAIN: None
SUBJECT: Sanitation District No. 5 (Port Costa)
Change Orders Nos. 5, 6, 7, 8, 9, and 10 to Construction Contract
with 'Robert J. Collins. (7380-6X5230)
On August 9, 1983, the Board of Supervisors, as Ex Officio Governing
Board of Contra Costa County Sanitation District No. 5, awarded a contract to
Robert J. Collins for the construction of a wastewater treatment facility.
Change Order No. 5 is described as follows:
5. Differing site conditions: Boulders in recirculation
building foundation excavation and soft soil encoun-
tered at bottom of excavation. Contract extension of
seven days. $ 8,261.05
Change Order No. 6 is described as follows:
6. Differing site conditions: Work around and remove
approximately 40 pipes and concrete piers, railroad
debris piles, large rocks, asphalt, road base,
heavy oil seeps, and water encountered on 10-inch
influence sewer. Contract extension of 11 days. $ 7,924.71
Change Order No. 7 consists of the following items:
7A. Differing site conditions: During excavation for
boring and jacking of the casing under the railroad
tracks, large boulders were encountered which
caused the contractor and engineer to study alter-
n Aive methods for installing the casing. After
careful consideration, the contractor was directed
to proceed according to the original plan. Contract
extension of 11 days. -0-
7B. Differing site conditions: Groundwater in the vicinity
of the recirculation building excavation was saturated
with waste oil . The oil seeped into the excavation
and reinforcing steel could not be installed until the
excavation could be de-watered. Electrical power was
not available at the site at that time. Contract
extension of 18 days. -0-
7C. The contractor was mistakenly directed by the construc-
tion managemerrt company to build berms of the filter
ponds to a wrong slope. The work had to be re-done.
Contract extension of seven days. $ 2,143.00
Total Change Order No. 7: $ 2,143.00
Change Order No. 8 consists of the following items:
8A. Differing site conditions: •The outfall profile was
surveyed prior to design of the project. The profile
changed considerably, probably due to storm erosion.
A change in the method of installing the outfall was
most cost-effective. Contract extension of 41 days. $ 9,643.00
00035
2
8B. Differing site conditions: During the course of in-
stalling the 10-inch outfall, several large boulders
were encountered and were removed. $ 7,187.65
Total Change Order No. 8: $16,830.65
Change Order No. 9 consists of the following items:
9A. Differing site conditions: A large boulder was dis-
covered during the excavation of filter pond F2. The
boulder was removed. Contract extension one day. $ 1,692.00
9B. A flushing hose as specified could not be connected
to the #3 water system and an adapter was required. $ 55.50
9C. A teamster union strike started on June 4, 1984.
The teamsters did not start making deliveries until
July 16, 1984. During this time, the contractor
could not get deliveries of shotcrete and filter
media. Contract extension of 42 days. -0-
Total Change Order No. 9: $ 1,747.50
Change Order No. 10 consists of the following items:
10A. Provide drain line from recirculation pumps to
floor drain. This was inadvertently left off the
original plans and specifications. $ 255.60
10B. Differing site conditions: Flume in metering manhole
needed to be reinstalled due to effects caused by
bending influent line to avoid the old chlorine
contact chamber. $ 1,204.80
10C. A reduction in the amount of slope protection was
ordered because a lesser amount of slope protec-
tion was .determined to be adequate. ($ 1,678.00)
Total Change Order No. 10: ($ 217.60)-Credit
TOTAL CHANGE THIS BOARD ORDER: $36,689.31
The construction project is being partially funded by a State and
Federal Clean Water Grant. Change Orders Nos. 5, 6, 7, 8, 9, and 10 are eligible
for grant reimbursement, pending approval by the State Water Resources Control
Board.
The Public Works Director, as Ex Officio District Engineer, recommends
that the Board approve Change Orders Nos. 5, 6, 7, 8, 9, and 10, and authorize
the Assistant Public Works Director, Environmental Control, to sign said Change
Orders.
IT IS BY THE BOARD ORDERED that the recommendation of the Public Works
Director be APPROVED.
1 hereby certify thni this is u true and correct copy of
Orig. Dept.: Public Works - EC an action taken and en.ered on the minutas of the
(DBO:c 1) sd5.bo.co.5.10.t9 Board of Supervisors on the de?e shown.
cc: County Administrator ATTESTED: SEP 181 �J_.__
Auditor-Controller PHIL BATCM.E_QOp. Cter::cf iiia Board
Public Works-Accounting of Supervisors and County Administrator
Robert J. Collins (via EC)
Harris & Assoc. (via EC)
By � �Deputy
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