City Council
Meeting: May 27, 2008
Agenda Item: 1-G
To: Mayor
and City Council
From: Joan Akins, Acting
Director – Environmental and
Subject: Charnock Well Field Restoration Project
Recommended Action
Staff recommends that the City Council:
1.
authorize
the City Manager to negotiate
and execute a three-year Professional Services Agreement with WorleyParsons
Komex for an amount not to exceed $900,000 to provide Technical Oversight and
Support Services for the Charnock Well Field Restoration Project; and
2. appropriate
$900,000 from the Charnock Fund balance into Account No. C050878.589500
Executive Summary
The Charnock Well Field Restoration Project (Project) will use the design-build
project delivery method to implement the necessary improvements to restore the
Charnock Well Field as a drinking water supply source. During the design-build process, the City
requires technical oversight and support services to ensure that the
improvements proposed by the design-build contractor are appropriate, and to
assist the City in obtaining operational permits. A selection process was conducted. WorleyParsons Komex was the only
respondent. Following staff evaluation
the firm is best suited to perform the services needed. Funds are available in the Charnock
Fund balance.
In June 1996, the drinking water supply
wells at the Charnock Well Field were shut down due to the detection of
gasoline additive methyl tertiary-butyl ether (MTBE) in the water supply. Since then, the City relies on imported water
from the Metropolitan Water District of Southern California to meet customer
demand as the process to mitigate the contamination of the Charnock sub-basin is
addressed.
In December 2006, the City assumed full
control of restoring the Charnock Well Field through a new settlement agreement
with the oil companies. On February
26, 2008, City Council authorized the City Manager to negotiate and
execute a design-build agreement with Black & Veatch Corporation, Agreement
No. 8892 (CCS), in an amount not to
exceed $4,300,000 for the Charnock Well Field Restoration Project.
The Project will restore the Charnock Well
Field as a drinking water supply. The design-build project delivery method uses
a single entity, and combines design and construction phases to ensure timely completion
of the project. Staff anticipates that
water deliveries from the new treatment facility will begin at the end of 2010.
Discussion
The Charnock Well Field Restoration Project
will employ several technically complex water treatment processes to restore
the City’s groundwater supply. The treatment
system proposed at Charnock consists of filtration with granular activated
carbon to remove the MTBE from three contaminated wells. The treated groundwater will be blended with
water pumped from two clean wells, and the total flow will be pumped to the
Arcadia Water Treatment Plant for final treatment and distribution. Final treatment system upgrades necessary at
the Arcadia Water Treatment Plant include softening, disinfection and
fluoridation. The
project is subject to environmental review and will be presented to City Council
in summer 2008.
The City requires assistance from an
independent consultant to evaluate the improvements proposed by the design-build
contractor. This evaluation will ensure that
the processes proposed are in the best long-term interest of the City, as the
City plan to operate the facility for 10 years after construction is complete.
Technical oversight and support services are
required throughout the design-build process including the pre-construction, construction,
demonstration/permitting and commissioning phases. This contract will cover a three-year period ending
June 30, 2011, which includes six months of technical support services after
the City begins operating the Charnock Water Treatment Facility in January 2011.
Consultant Selection
On
A selection committee comprised of staff
from Environmental and Public Works Management Department evaluated the proposal. The selection criteria included staff
qualifications and experience; drinking water treatment processes experience;
groundwater restoration experience; and regulatory knowledge in permitting water
treatment facilities. WorleyParsons Komex has provided consulting
services to the City relative to the MTBE contamination at the Charnock Well Field
since the problem was discovered in 1996.
They have provided technical expertise and have an understanding of
WorleyParsons Komex will provide
professional services to the City that will include: technical support and
process evaluation; technical liaison between with the City and the
design-build contractor; assistance in the permitting process; and preparation
of technical memoranda for the groundwater flow, groundwater transport models
and model simulations and development of the regional groundwater monitoring
program.
WorleyParsons Komex is at the forefront of
the industry through investigation, mitigation and remediation of leaking
underground storage tank sites that result in contamination of public drinking
water wells by MTBE. Worley Parsons
performed a detailed characterization of contaminant and migration sources to
evaluate the MTBE contamination for the Cambria Community Services District in
Financial
Impacts & Budget Actions
Funds in the amount of $900,000 need to be
appropriated from the Charnock Fund balance into Account No. C050878.589500
“Charnock Well Field Restoration
Project”.
Prepared
by:
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Approved: |
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Forwarded to Council: |
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Joan Akins Acting Director -
Environmental and Public Works Management Department |
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P. City Manager |