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EDMUND G. BRDwN JR. .-I.M R MATREw RODAIDDES Water Boards ryV1PONME A Central Valley Regional Water Quality Control Board RECEIVED 15 November 2016 MOV 1 0 2016 ENVIRONMENTAL HEALTH PERMIT/SERVICES James Bewley, Director of Operations Oakwood Lake Water District P.O. Box 690339 Stockton, CA 95269-0339 APPROVAL FOR CAPACITY INCREASE, OAKWOOD LAKE WATER DISTRICT, OAKWOOD LAKE WASTEWATER TREATMENT FACILITY, SAN JOAQUIN COUNTY Central Valley Water Board (Water Board) staff has reviewed the technical report titled Recycled Water Expansion Report (RWER) — Phase 1 B dated September 2016. The RWER was submitted by Oakwood Lake Water District (OLWD) to request an increase of the permitted monthly average influent flow from 77,700 gallons per day (gpd) to 86,300 gpd at the Oakwood Lake Wastewater Treatment Facility (WWTF). Staff has reviewed the report and determined that it is complete. The Oakwood Lake WWTF is regulated under Waste Discharge Requirements (WDRs) Order R5-2006-0114-002 which was amended by Order R5-2016-0068 on 19 August 2016. The WWTF serves a mobile home community and was expanded to accommodate new residential and commercial developments within the Oakwood Lake Resort community. The treatment system equipment was constructed as part of the Phase I development. Recycled water storage ponds and land application areas were constructed in phases to accommodate future residential and commercial developments. In accordance with Discharge Specification B.2 of WDRs R5-2006-0114-002, "Effective on the date of Executive Officer approval of the reports required by Provision G.I.e, G.I.f, and G.1.h for each successive expansion of the WWTF, influent flows shall not exceed the average monthly flow limit specified in the approval letter." Provision G.1.e requires the Discharger to submit an As-Built Report certifying WWTP construction. Provision G.1.f requires submittal of a Recycled Water Application Plan. And Provision G.1.h requires submittal of a Recycled Water Expansion Report. The RWER included a water balance capacity analysis demonstrating that the existing pond capacity including an additional 1.8 acres of land application areas provides sufficient storage and disposal capacity for a monthly average wastewater flow of 86,300 gpd. A summary of the Phase 1A and Phase 1 B development capacities is shown in the table below. KARL E. LONGLEv BCD. P.E. cNun I PAMELA C. CREEOON P.E., BCEE, EXECUTIVE OFFICER 11020$Un C.n,Ar D..#200.Ran°Im Corc°ve,CA 95570 � www.wRLfbOpltle.ca.9ov/cenhelvellay ('j RAcru -'A.