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EDMUNO G. BROWN JR. )l�e GOVERNOR ovw� MATTHEW ROO RIOUEZ SE11L111 AL IE O R N I ENVIRONMENTAL PROTECTION Water Boards Central Valley Regional Water Quality Control Board RECEIVED 24 November 2014 NOV 2 5 2014 ENVIRONMENTAL HEALTH Patrick Flynn PERMIT/SERVICES Director of Public Works 390 Towne Center Drive Lathrop, California 95330 MONITORING WELL DESTRUCTION WORKPLAN APPROVAL, CITY OF LATHROP CONSOLIDATED TREATMENT FACILITY, RIVER ISLANDS USE AREAS, SAN JOAQUIN COUNTY I have reviewed your letter dated 20 November 2014, and the Work Plan for Well Abandonment, dated 5 November 2014, for the River Islands community (River Islands) in San Joaquin County. The Work Plan was submitted on behalf of River Islands Development LLC by ENGEO. The Work Plan proposes the abandonment and destruction of two existing groundwater monitoring wells (MWR-1 and MWR-2) associated with the River Islands development. The monitoring wells were originally installed in 1999 on behalf of Califia Development Group. Since then, these two monitoring wells have been used to monitoring groundwater conditions related to the nearby discharge of recycled water for the City of Lathrop under Waste Discharge Requirements (WDRs) and Master Recycling Permit Order R5-2006-0094, which was adopted on 22 September 2006. Groundwater monitoring wells MWR-1 and MWR-2 are not routinely sampled and are not critical to ongoing groundwater monitoring activities under R5-2006-0094. It is our understanding that River Islands intends to properly abandon these wells in advance of grading and land development activities. Although we concur with River Islands'. proposal to abandon these two monitoring wells, all well abandonment activities must be conducted in accordance with San Joaquin County Environmental Health Department permitting requirements to effectively seal the shallow groundwater interval from deeper water-bearing zones. Therefore, provided that the work is conducted in accordance with permits issued by the San Joaquin County Environmental Health Department, the Work Plan is approved. Upon completion of well abandonment activities, please submit a Monitoring Well Abandonment Report to this office that describes in detail the methods used to abandon each well and including copies of well abandonment permits issued by the San Joaquin County Environmental Health Department. Please note that all letters, documents, and other materials that you would normally submit to us as hard copies must also be submitted in a searchable Portable Document Format (PDF). Documents that are less than 50 MB should be emailed to: centralvalleysacramento(a-)waterboards.ca.gov KARL E. LONGLEV ScD, P.E., CHAIR j PAMELA C. CREEDON P.E., BCEE, EXECUTIVE OFFICER 11020 Sun Center Drive#200,Rancho Cordova,CA 95670 1 www.waterboards.ca.gov/c.ntralvalley CD RECYCLED PAPER