WQCF Phase 3A - Construction Management

The City of Patterson is seeking individuals, teams, firms, or a combination thereof interested in providing construction inspection, contract administration and materials testing services, and system start-ups for the WQCF Phase 3A Wastewater Expansion Project. These services include, but are not limited to, inspection of all work performed by the contractor to ensure compliance with plans and specifications, daily reports including pictures to be submitted to the city.  Full scope of work is described in Section 3; Scope of Work which can be obtained from Valley Builders Exchange.

Project Description

The City’s existing Wastewater Quality Control Facility (WQCF) is located at the easterly end of Walnut Avenue, approximately 1.5 miles east of city limits.  The WQCF has a permitted wastewater treatment capacity of 2.25 MGD, with an approximate 2.25 MGD of reliable treatment capacity, and an existing average Dry Weather Flow of approximately 1.75 MGD.

The WQCF consists of three separate processes: The North Activated Sludge Treatment System (NASTS), the Advanced Integrated Pond System (AIPS), and the South Activated Sludge Treatment System (SASTS).  The treated effluent is then pumped to percolation ponds for groundwater recharging.   The current capacity for the NASTS is 0.8 MGD, AIPS is 0.2 MGD and the SASTS is 1.25 MGD.

The WQCF Phase 3A expansion shall be a pre-fabricated packaged Membrane Bioreactor (MBR) treatment system with a minimum treatment capacity of 0.625 MGD.  The MBR treatment system shall include all necessary appurtenances associated for its implementation to the City’s existing WQCF treatment system. In addition to the pre-fabricated MBR treatment system, Phase 3A expansion will include improving the screens at the influent pump station to accommodate the MBR treatment process, a potential new influent pump station to serve as redundancy and/or supplement existing IPS, conversion of Pond #1 to be an equalization pond, a new sludge dewatering area of approximately 1.25 acres, installing a second solids dewatering unit (screw press, belt press, other) and potentially utilizing battery packs as back-up power.