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In late 2001 and early 2002 the District performed a Particle Removal Demonstration Study. Based on the results, the Department of Health Services (DHS) determined that the existing inline, high-rate filtration process should be converted into a direct filtration facility through operational and mechanical improvements to the treatment process.
In August 2002, The District's consulting engineer, PACE Engineering, Inc., (PACE) completed a pre-design report recommending specific improvements to the District's Wintu Pump Station and Water Treatment Plant that would be needed in order to meet the requirements of the Department of Health Services (DHS). In December 2002 the District made application to the DHS for funding under the Safe Drinking Water State Revolving Loan Program. In September 2003 the District received notification from the DHS that its application had been approved and that the District would be eligible for a funding under the Safe Drinking Water State Revolving Fund.
In October of 2003 the District executed a contract with PACE for the preparation of construction plans and specifications for the project. The District staff worked closely with the engineers at PACE on the design of the improvements and the planning for construction that involved extensive modifications to existing facilities. The resulting design was completed in June 2004 and submitted to the DHS for their review and approval. After receiving approval from the DHS the project was put out to bid and bids were received on July 20, 2004.
The construction contract was awarded to Ray Toney and Associates on July 26, 2004, and the notice-to-proceed was issued on September 8, 2004. The contract for the supervisory control and data acquisition (SCADA) was awarded to Meyer Control Corporation.
It was anticipated that construction of the improvements would take approximately two years. In order to make the necessary modification to existing facilities at the Wintu Pump Station and the Water Treatment Plant while maintaining water service to its customers the contractor was limited to two shutdowns, each four months in duration, during the months of November to March. Construction began in September 2004 and was completed in July 2006. The total construction cost was approximately $7.8 million. Change orders on the project totaled approximately $0.4 million or approximately 5 percent of the original construction cost.
The updated facilities will provide substantial water quality benefits which include reduced filter loading rates, rinse to waste capability, independent monitoring and controls for each filter, improved coagulant and chlorine injection, and improved disinfection contact time. Additionally, the backup generator, variable speed pumps and extensive computer automation will provide improved reliability and service to its customers into the future.