25F - AGMT FOR STORMWATER - Laserfiche WebLink

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y"L project components include a diversion structure to divert water from an existing storm drain system, a pretreatment structure to remove debris from the runoff, an underground structure to capture and store the stormwater prior to being discharged back into the existing storm drain system, and a rehabilitated park surface. Design objectives are to eliminate dry -weather flow from the adjacent channel and to maximize wet -weather pollutant capture. Mayfair Park Stormwater and Runoff Capture Project, City of Lakewood, CA. Design Engineer. Responsibilities include existing utility analysis and production of engineering plans related to the design of a stormwater diversion and infiltration system, and the civil engineering plans, including erosion control, demolition, grading and drainage, and horizontal control for the underground and surface improvements to Mayfair Park. Tetra Tech is contracted to evaluate this potential site location and develop this stormwater runoff and capture project. The project consists of an airinflated 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 secured cloud based system. The underground storage system is 4.5 million gallons (13.8 ac-ft). The goal of the project is to not only help the City comply with the metals Total Maximum Daily Loads (TMDLs), as presented in the Los Cerritos Channel Watershed Management Program, but also provide additional benefits, such as revitalized park infrastructure and augmentation of local water supplies. Caruthers Park Stormwater and Urban Runoff Capture Project, City of Bellflower, CA.. Design Engineer. Contributing to the pre -design and design services for this Caltrans funded stormwater capture project. Tetra Tech is providing a Project Engineering Study Report 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. Alondra Park Multi -Benefit Stormwater Capture Project, Los Angeles County Department of Public Works, Los Angeles, CA. Design Engineer. Contributed to the topographic survey and development of 30% design plans for a 30+ acre-foot regional stormwater capture BMP. Tetra Tech was contracted to develop a Preliminary Concept Report for the design of a multi -benefit stormwater capture project identified in the Enhanced Watershed Management Program for the Dominguez Channel Watershed Management Area. Tetra Tech provided a geotechnical evaluation of the project site and determined the maximum potential drainage area that could be captured. Several BMP size options were developed, and recommendations were provided for the BMP location, type, and size of pre- treatment systems and diversion structures for each option. City of Santa Ana 2f 0