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0 Caruthers Park Stormwater and Urban Runoff Capture Project, City of Bellflower, Bellflower, CA. Construction/Pre-Construction Support. Providing engineering design support for this Caltrans funded stormwater capture project. Tetra Tech is providing a Project Engineering Study Report (PESR) that includes all necessary analyses to provide a recommendation for regional stormwater capture treatment and implementation. The analysis identifies the existing site hydrology, water quality, and hydraulics to determine an optimal combination of the inflow rate, storage volume, and outflow. The Caruthers Park Project consists of a gravity diversion from two separate Los Angeles County Flood Control District storm drain lines; a 72" RCP line that drains 261 acres of the Los Cerritos Channel, and a 38' wide rectangular concrete channel that drains 2,995 acres of the Lower San Gabriel River. The diverted flows pass through a pretreatment system to remove trash, debris, and sediment. The runoff is then passed into a large buried multi -chambered storage/infiltration facility that will be treated and used to irrigate the park. Flows in excess of the required irrigation demands will pass into the infiltration gallery to be exfiltrated through the soil to eventually combine with the ground water. It is anticipated that the system will use active controls to monitor the weather conditions and empty the facility through a secured cloud -based system. This project will help the City comply with their bacteria and metals TMDL, while providing additional benefits of potable water offset and park revitalization. Stormwater and Runoff Capture Project at Carriage Crest Park, City of Carson, CA. Construction/ Pre -Construction Support.. Manages the project schedule, quality, and cost on behalf of the City. Provides interpretation of design intent and specification through mediation between the designer and contractor. Tetra Tech was contracted to evaluate the potential site location and develop the stormwater runoff and capture project. In addition, Tetra Tech was also tasked to provide construction management for the project. The project diverts runoff from approximately 1,146 acres in the Dominguez Channel Watershed and discharge captured runoff to the Los Angeles County Sanitation District's Sewer system through a pre-treatment system that removes trash, debris, and sediment, and an underground reservoir that holds 4.39 million gallons (13.5 ac-ft). The diversion will provide a significant water quality benefit to the community by removing stormwater pollutants from the Wilmington Drain an Machado Lake. Construction has commenced and is anticipated to be complete by June 2020. Stormwater and Runoff Capture Project at Mayfair Park, City of Lakewood, CA. Project Engineer. Support during construction consists of submittal reviews, inspection of drainage structures, interpretation of design intent, and specification through RFI's responses, and assisting construction manager in reviewing schedule and change order request. Tetra Tech was contracted to evaluate the potential site location and develop this stormwater runoff and capture project. The project consists of an air -inflated rubber dam diversion system to re -direct all urban runoff and stormwater runoff from the Clark Channel through a pre-treatment system to remove trash, debris, and sediment. A drainage pipeline will convey the water into a large, buried multi -chambered storage and filtration facility. The stormwater collected in the underground reservoir will be treated and used to irrigate the park's landscaped areas. The system will monitor the weather conditions and the facility through a secured cloud based system. The underground storage system is 4.5 million gallons (13.8 ac-ft). The detailed design phase has commenced and reached project completion on January 2020. City of Santa Ana 02 I 4