M
E M O R A N D U M
To: PBCSD Board of
Directors
From: Michael
Niccum, District Engineer
Subject:
_________________________________________________________________________
Anderson Pacific Engineering Construction, Inc.
(Anderson Pacific) made good progress on construction of the Forest Lake
Reservoir Components of the Expanded CAWD/PBCSD Wastewater Reclamation
Project. The contractor performed
initial testing of the microstrainers, plant feed pumps, chemical feed systems
for chlorine injection and pH adjustment and miscellaneous mechanical and electrical
equipment in the chemical building.
Instrumentation subcontractor Tesco Controls installed programming for
the instrumentation controls located at the chemical and maintenance department
buildings and calibrated a number of measuring devices required for automatic
control of the treatment facility. Recycled water from the reservoir is available
for the distribution system through manual operation of the treatment
facilities.
The reservoir is filled with recycled water to the
permitted storage capacity of 325 acre-feet or 105 million gallons. No water has been observed to date from the
leak detection system below the liner. Water
stored in the reservoir initially had a green tint indicating the presence of
algae, which was confirmed by high chlorophyll and pH concentrations measured
in water sample testing. Poor water
clarity in the reservoir was confirmed by a Secchi disc measurement of less than
18 inches. Within the past two weeks the
water in the reservoir become clearer with a Secchi disc measurement of
approximately 6 feet and the green tint was replaced with a light brown tint. Water samples are collected weekly and chlorophyll
and pH concentrations also dropped significantly.
Professor Alex Horne, Professor Emeritus, Ecological
Engineering, University of California at
crustacean zooplankton that graze at a rate about 100
times greater than rotifers to help keep the reservoir balanced naturally. While the application of chemicals like copper
sulfate or chlorine is a very effective method of killing algae, the algae grazers
are also killed and the natural balance of the reservoir goes back to square
one.
A copy of the current construction schedule is
attached. Completed work items are
indicated in red. Substantial completion
of the project, when the project improvements will operate automatically, is
scheduled for May 19th and final completion is estimated at the end
of May.
Anderson Pacific has earned $10,977,046 or 94 % of the
revised construction contract amount of $11,656,726. E2 Consulting Engineers has earned $929,356
or 95 % of the budget of $978,420 for construction management services.
ADDITIONAL WORK
Change
order number 11 was executed by the General Manager in April increasing the sum
of the construction contract by $125,000 as described below.
Change
Order No. 11 (+$125,000)
a)
Install four
security cameras mounted on two new poles near the outlet structure and on the
chemical building. Signals will be
transmitted wirelessly to from the remote locations to the chemical building
(+$65,000)
b)
Install fiber optic
line between
Ten
change orders totaling $720,726 have been executed to date increasing the
contract value to $11,656,726. The Board previously authorized the General Manager to approve
change orders for this project within an aggregate limit of $775,000, or 7 % of
the original contract amount of $10,936,000.
The four-way construction and operations agreement requires the consent
of the Pebble Beach Company prior to reimbursement for any changes above the 5
% contingency level.
Reviewed:
General Manager: RA
Date: 4/21/06