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EXPERIENCE <br />Carriage Crest Stormwater Capture Project <br />Los Angeles, CA <br />Carriage Crest Park was identified in the Dominguez Channel Watershed <br />Management Group EWMP as a high priority site for a regional stormwater <br />capture project due to its proximity to two large storm drains with a total <br />drainage area exceeding 1,100 acres. This area discharges into Wilmington <br />Drain which subsequently discharges into Machado Lake. The overarching <br />objective of the project is to improve the quality of Machado Lake by <br />eliminating dry -weather runoff and reducing wet -weather pollutant loading. <br />The City of Carson entered into a Cooperative Implementation Agreement <br />(CIA) with Caltrans to fund the Carson Water Capture Project at Carriage <br />Crest Park. The City of Carson entered into a subsequent agreement with the <br />Sanitation Districts of Los Angeles County (LACSD) to manage the project. <br />Tetra Tech developed the preliminary engineering design report which <br />included the analysis and developed innovative water use and treatment <br />scenarios including (1) diversion to the sanitary sewer for treatment at <br />the adjacent Joint Water Pollutant Control Plant (JWPCP), (2) onsite non - <br />potable use to offset potable water demand, and (3) onsite filtration using a <br />subsurface filter media bed. <br />Tetra Tech prepared the detailed design drawings, cost estimates, and <br />specifications for the pre -cast structures package for the construction of the <br />regional stormwater BMP facility, and Tetra Tech is also currently providing <br />support during construction. <br />City of,Santa Ana <br />TETRA TECH <br />