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Natural Treatment System Basin Designs-33 Sites <br />Orange County, CA <br />Stantec has designed and supported construction of 33 <br />Natural Treatment System (NTS) basins within the San <br />Diego Creek watershed, the primary tributary to Upper <br />Newport Back Bay and the Pacific Ocean. The NTS program <br />is a public private partnership between Irvine Ranch Water <br />District (IRWD) and the Irvine Community Development <br />Company to provide a master planned regional water quality <br />solution to improve the environment in the Upper Newport <br />Back Bay, a high priority impaired water body with the Santa <br />Ana Regional Water Quality Control Board. The scope of the <br />NTS basin work ranges from small offline basins supporting <br />a local drainage area, to large in -line basins located within <br />regional flood control channels and retarding basins. Our <br />experience spans IRWD's entire NTS basin network and <br />history of the NTS program between the Irvine Community <br />Development Company (]CDC). <br />Our involvement with the NTS program began with designing <br />the San Joaquin Marsh wetlands, where we refined and <br />perfected treatment processes in a one of a kind regional <br />water quality treatment facility. We also established the first <br />NTS basins within the Quail Hill and Turtle Ridge planning <br />areas, developing flow control structure details and the <br />first Operations and Maintenance (0&M) Manuals. As <br />the program evolved and became more complex with the <br />development of more planning areas, our methodologies <br />did too. Stantec helped specify equipment and develop <br />details for automated water quality monitoring equipment <br />and flow monitoring sensors. This improved data collection <br />contributed to a better understanding of each basin's <br />effectiveness within the NTS basin network. <br />Key Elements <br />• Our team has been involved in all stages of the <br />development process, from early concept design to <br />tentative mapping entitlement. Services included <br />preparation of construction -level plan, specification, and <br />estimates (PS&Es) and 0&Ms, processing of approvals <br />through various public agencies, and construction support. <br />Team Members <br />• Roger Chung, PE, CFM, QSD/P, F. ASCE—Stantec <br />• Phil Jones, PE, QSD/P—Stantec <br />• Greg Sebourn, PLS—Stantec <br />• Dan Hayes, PE—Stantec <br />Project Dates <br />2003-2017 <br />Reference <br />Ian Swift <br />Natural Resources Manager <br />Irvine Ranch Water District <br />3512 Michelson Drive Irvine, CA 92612 <br />T. 949-453-5864 <br />E: Swift@irwd.com <br />Stantec • Proposal for On -Call Slormwater Project Design Services m <br />