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County approves change order after Spring Valley test well unexpectedly yielded higher flow
Summary
Lake County approved Change Order No. 1 with Weeks Drilling and Pump Co. for $133,400 after contractors deepened a Spring Valley test well to about 560 feet and increased estimated output to roughly 300 gallons per minute; the well retrofit will be bid separately.
The Lake County Board of Supervisors on Tuesday approved a $133,400 change order to a contract with Weeks Drilling and Pump Company after a Spring Valley test well exceeded initial expectations and required additional drilling work.
Special Districts Administrator Robin Vooray told the board the original contract called for drilling to about 300 feet at a contract price of roughly $147,000. Drillers encountered additional water-bearing zones and rock below that depth and continued drilling to approximately 560 feet; the change order covers the added drilling, reaming, casing, screening and related work.
Vooray said engineers and the driller estimate the test well—s flow now might be closer to 300 gallons per minute, compared with the existing Spring Valley surface water plant—s capacity of about 190 gallons per minute. The project is funded by an existing grant, Vooray said, and state regulations require a secondary water source for Spring Valley.
The board approved the change order and authorized the special districts administrator to sign the contract. Vooray said the county will separately solicit bids for the retrofit (pump installation, laterals and related work) now that drilling is complete and water quality testing is underway.
Vooray described the preliminary quality indicators as promising but said formal testing would determine final suitability.
