Phase 1

���߲ݴ�ý. has teamed with Webcor Builders and Obayashi Corporation to form Webcor, Obayashi, ���߲ݴ�ý, (WOL) a Joint Venture CMAR for the Silverlake Complex Storage Replacement Project. WOL provides construction services and design support for LADWP to meet Federal Water Quality Regulations by con-structing two underground reservoirs and a 96’’ diameter pipeline which will re-place the operational function of the existing Silverlake and Ivanhoe reservoirs. Phase 1 of the project consists of the construction of a 55 million gallon concrete reservoir, connecting piping and a 3,000 foot long 12 foot diameter tunnel.

Phase 2

Phase 2 consists of the construction of a 60 million gallon concrete reservoir, inlet and outlet piping and installation of 840 lf of 78” diameter steel pipeline.

The SESWTF is designed to treat 80 MGD of surface (river) water from the Kings River to provide potable water to City residents. This greenfield project includes the following processes; flow control struc-ture, pre-treatment basins (flocculation/sedimentation with plate settlers), ozone disinfection structure, and filters (GAC gravity filter). The facility also includes an 8MG treated water reservoir, chemical building, treated water and backwash pump station; washwater recovery and solids lagoons and associated pump stations, electrical substation, operations building, maintenance building, all site utilities (with pipelines up to 84”), landscaping and pavement throughout the site, perimeter block wall and offsite road utilities.

The Northwest Bakersfield Water Treatment Plant has been unable to achieve design capacity due to high turbidity water reaching the membrane filters which resulted in excessive backwashing and reduced plant output. ���߲ݴ�ý. with Black & Veatch as a design sub consultant was selected to provide design-build services to increase plant capacity to 8 MGD (net) and 10.4 MGD (peak) by installing a pretreatment system ahead of the membrane filters. The project included the construction of a 0.42 MG gallon concrete Pretreatment Basin with four Flocculating Mixers, and two trains of Plate Settlers with Straight Line Residuals Sludge Collecting equipment. Mechanical piping sludge draw off from the basins to sewer occurs via a hydraulic head pressure siphon. A new onsite PACL chemical system was installed that included tank storage, chemical feed and flash mixing facilities. The existing earth retention basin was reconstructed and concrete lined to handle the treatment process backwash, system overflows and site storm water runoff. All work was constructed on a very congested site with limited available space for equipment laydown and construction operations.

1,2,3-Trichloropropane (TCP), is an unregulated organic chemical that the State Water Resources Control Board (“SWRCB”) and its Division of Drinking Water have been studying for regulation for several years. In late 2017, the SWRCB approved a maximum containment level (MCL) for TCP of 5 parts per trillion, with compliance monitoring scheduled to commence in January 2018. This fast-track project was required for the City to meet TCP MCL compliance. The City identified 34 well sites that needed treatment with granulated activated carbon (GAC) and ���߲ݴ�ý. (WML) was contracted under a progressive design-build agreement for engineering and construction services. WML provided the procurement, installation, carbon loading, and start-up and commissioning of 104 owner-furnished GAC vessels, which expeditiously brought all 34 well sites into full and complete TCP MCL compliance. Provost & Pritchard was engaged to perform engineering and construction management. Construction also included site grading and earthwork, mechanical piping, concrete foundations, backwash tanks and offsite piping.

This project involved the installation of two new deep well pumps with associated piping, valves, flow meters and electrical. Including development of two well sites with fencing, sumps, and surfacing. New steel chemical injection manifold and tie into existing storage tank. This project includes new Solar Bee tank mixing equipment and hydro pneumatic skid and controls.