SR 12-06-2016 3K
Ci ty Council
Report
City Council Meeting : December 6, 2016
Agenda Item: 3.K
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To: Mayor and City Council
From: Susan Cline, Director , Public Works, Water Resources
Subject: City Services Building Well Construction Contract Change Order
Recommended Action
Staff recommends that the City Council authorize the City Manager to negotia te and
execute a first modification to A greement #10336 (CCS) in the amount of $15,55 4 with
BC 2 Environmental, a California -based company, for additional construction services on
the City Services Building exploratory boring and water supply drilling proje ct . This will
result in a n amended agreement with a new total amount not to exceed $284,59 1 .
Executive Summary
On July 12, 2016 (Attachment A), Council authorized the City to enter into a
construction contract with BC 2 Environmental to drill a 650 foot d eep exploratory well on
the west side of City Hall to evaluate regional geology and to potentially install a
groundwater supply well for the new City Services Building (CSB) in an amount not to
exceed $269,037. Due to construction noise concerns expressed by the community,
sound abatement panels were deployed. Further, additional pumping to obtain
necessary water samples and disposal of sediment generated by testing activities was
also required . Staff recommends that Council authorize the City Manager to e xecute a
first modification to construction contract #10336 (CCS) for $15,55 4 with an amended
new total amount not to exceed $284,59 1 .
Background
Drilling for this project commenced on September 20, 2016. A primary objective of this
project was to drill and obtain hydrogeologic data from a deep exploratory boring which
would be used to assess the quantity and quality of the City’s groundwater resources in
this portion of the Coastal sub basin. A secondary objective of the project was to
construct a shall ow, small -diameter potable -supply water well to support the proposed
City Services Building (CSB ). Once tested and permitted, groundwater from the well
w ould be treated and utilized as a supplemental onsite water source for the CSB. The
design of the pota ble well w ould be based on the hydrogeologic data obtained from the
exploratory boring.
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The proposed deep exploratory boring was drilled using standard water well drilling
methods to collect samples, evaluate the subsurface geology, and obtain geophysical
logging data from the borehole. A critical piece of data the City obtained was the
confirmation of fresh groundwater in the subsurface at this location and the depth to the
subsurface interface between fresh groundwater water and saline groundwater. A
d irect benefit of this data is that it supports the City’s strategic planning for long -term
water self -sufficiency. The well wa s completed on October 20, 2016.
Discussion
This project was procured utilizing the City’s competitive bid process. On April 14, 2016,
the City published Notices Inviting Bids to furnish and provide drilling and well
construction work in accordance with City specifications. The bid was posted on the
City’s on -line bidding site, and notices were advertised in the Santa Monica Daily P ress
in accordance with City Charter and Municipal Code provisions. The City received five
proposals. BC 2 Environmental was selected based on, among other things, price and
experience.
Due to construction noise concerns expressed by the community, optiona l sound
abatement panels were deployed at the project site during drilling. Additional pumping
was also required to obtain necessary groundwater quality samples because of the high
clay content in the subsurface at the drilling location . In addition, the clay sediment
needed to be vacuumed from the bottom of the onsite Baker storage tanks to provide
storage space for development water from the well. The unforeseen additional
contractor time and high clay content at the drilling site resulted in change or der costs
exceeding the 10% contingency for this project. Two groundwater bearing zones were
identified for potential use. The project is now complete.
Financial Impacts and Budget Actions
The contract modification to be awarded to BC 2 Environmental is $15,55 4 , for an
amended contract total not to exceed $284,59 1 . Funds are available in the FY 2016 -17
Capital Improvement Program budget in account C019 0 45.589000.
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Prepared By: Thomas Watson, Water Resources Protection Programs
Coordinator
Approved
Forw arded to Council
Attachments:
A. July 12, 2016 Staff Report - Award Design and Construction Contract for City
Services Building Well
Reference:
Modify Agreement No. 10336
(CCS)