HomeMy WebLinkAboutAgenda Report - June 17, 2020 C-16AGEilDA ITEM c-lb
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AGENDA TITLE:
MEETING DATE:
PREPARED BY:
Accept lmprovements Under Contract for Granular Activated Carbon Replacement,
Well No.4R and Well No. 22
June 17,2020
Public Works Director
RECOMMENDED ACTION Accept improvements under contract for Granular Activated Carbon
Replacement, Well No. 4R and Well No. 22.
BACKGROUND INFORMATION The granular activated carbon (GAC) replacement project for Well
4R and Well22 was competitively bid and awarded to Calgon
Carbon Corporation on February 6,2019, in the amount of
$230,222
This project consisted of removing the spent granular activated carbon (GAC) from the treatment vessels
serving well sites 4R and 22, inspecting the vessels for needed repairs (if any); installing new domestic
virgin GAC into the vessels; and other incidental and related work as described in the specifications for
the above project.
The work was completed in substantial compliance with the contract documents and approved change
orders. The fìnal contract price was $565,782. The difference between the contract amount and the final
price was due to six change orders totaling $335,560.
Change Order No. I included the cost to perform unforeseen repairs on two vessels at Well No. 22
($28,699).
Change Order No. 2 included the repair of three vessels at Well No. 4R ($43,048)
Change Order No. 3 included repairs to the top head nozzle at Well No. 22, which was not included in the
original inspection and repair ($8,635)
The GAC replacement at Well No. 4R and Well No. 22 was completed with a total cost of $310,604.
On December 18, 2019 Council authorized additional change orders (not to exceed $350,000) to
expedite the same scope of work at Well No. 18 and Well No. 20. This allowed the GAC at those wells to
be replaced during the winter months (when water demand is low), so they could be online by the spring
(when demand begins to increase).
Once approved, GAC replacement work at Well No. 18 and Well No. 20 was initiated with Change Order
No. 4 ($235,524). The following two additional change orders were needed to complete the work:
APPROVED
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Manager
6t8t2020
Accept lmprovements Under Contract for Granular Activeted Carbon (GAC) Replacement, Well No. 4R and Well No. 22
June 17,2O2O
Page 2
Change Order No. 5 included necessary repairs to the inside of the GAC vessels (found during the
inspection) ($6,160).
Change Order No. 6 included sales tax on the new GAC (provided by Change Order No. 4) ($13,494).
The GAC replacement at Well No. 18 and Well No. 20 (Change Orders No. 4 - No. 6) was completed
with a total cost of $255,178.
Following acceptance by the City Council, as required by law, the City Engineer will file a Notice of
Completion with the County Recorder's office. The notice serves to notiff vendors and subcontractors
that the project is complete and begins their 30-day period to file a stop notice requiring the City to
withhold payments from the prime contractor in the event of a payment dispute.
FISCAL IMPACT:This project was necessary to comply with the maximum contaminant levels
at these well sites. The project does not create any additional maintenance
costs.
FUNDING AVAILABLE: This project was funded through DBCP settlement funds
Charles E. Swimley, Jr
Public Works Director
Prepared by Sean Nathan, Senior Civil Engineer
CES/SN/tc
Cc: Utility Superintendent
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