25F - AGMT FOR STORMWATER - Laserfiche WebLink

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I 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 pass into the infiltration gallery to be exfiltrated through the soil to eventually combine with the ground water. This project will help the City comply with their bacteria and metals TMDL, while providing additional benefits of potable water offset and park revitalization. Lakewood Stormwater Capture and Infiltration Project at Mayfair Park, City of Lakewood, CA. Design Engineer. Assesses the influent water quality and develops sampling protocols for the stormwater harvesting system at Mayfair Park. Tetra Tech is 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 conveys 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). Lakewood Stormwater Capture and Infiltration Project at Bolivar Park, City of Lakewood, CA. Design Engineer. Assessed the influent water quality and developed sampling protocols for the stormwater harvesting system at Bolivar Park. Tetra Tech was contracted to evaluate the potential site location and develop this stormwater runoff and capture project. The project consisted of an air -inflated rubber dam diversion system to re -direct all urban runoff and stormwater runoff from the Del Amo channel through a pre-treatment system to remove trash, debris, and sediment. A pump station and drainage pipeline conveyed the water into a large, buried multi -chambered storage/infiltration facility. The stormwater collected in the underground reservoir was treated and used to irrigate the park's landscaped areas. The system monitors the weather conditions and the facility through a secured cloud -based system. The underground storage system is 2.8 million gallons (8.7 ac-ft). Design Services for the Silver Lake Reservoir Stormwater Capture Project, MARRS Services Inc., City of Los Angeles Bureau of Engineering, CA. Lead Designer. Provided hydrology and hydraulics design support services, including delineating drainage areas where stormwater could be feasibly captured and routed to the existing Silver Lake and Ivanhoe Reservoirs, defining preliminary pipe alignments and structure locations (catch basins, manholes, and pretreatment devices) based on flow paths and existing utility locations, drafted exhibits to include as supporting figures in a Project Engineering Study Report (PESR), and wrote a PESR that summarizes these findings. The existing Silver Lake and Ivanhoe Reservoirs are located in the neighborhood of Silver Lake in the City of Los Angeles. These reservoirs relied on potable water to maintain a constant water surface elevation that would otherwise decrease due to evaporation losses and leaks. This project proposed to capture and route stormwater to these reservoirs to offset potable water demands. City of Santa Ana 2f 2