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oo E:.on� °wx <br /> RECEIVE® <br /> Water Boards FEB 4 2013 v MA'11.. <br /> xvrunnuFr,ra namrcn°x <br /> Central Valley Regional Water Quality Control BbbWITlSERVICES <br /> 31 January 2013 <br /> Mr. Jay Utal <br /> Nextbay Properties, LLC <br /> 3000 Danville Boulevard <br /> Alamo, CA 94507 <br /> REPORT REVIEW, TRAILS OF MANTECA, 2368 EAST WOODWARD AVENUE, <br /> MANTECA, SAN JOAQUIN COUNTY <br /> Regional Water Quality Control Board, Central Valley Region (Central Valley Water <br /> Board) staff reviewed your 3 January 2013 Soil and Groundwater Assessment (Report) <br /> submitted on your behalf by ENGEO, Inc. (ENGEO). The Report was submitted in <br /> response to our 30 October 2012 letter approving your work plan for further site <br /> investigation at the Trails of Manteca site located at 2368 East Woodward Avenue in <br /> Manteca (Site). <br /> In 2005, diesel was detected in soil and groundwater samples obtained adjacent to an <br /> above-ground storage tank (AST). In 2008, you excavated 315 tons of diesel-impacted <br /> soil to a depth of eight feet; however, you did not sample groundwater to evaluate if <br /> residual hydrocarbons remained. <br /> In December 2012, ENGEO collected soil and groundwater samples from 10 borings <br /> drilled to a depth of 25 feet below ground surface (bgs) and located in a grid pattern <br /> around the former AST area. First groundwater was encountered during drilling from 15 <br /> to 17 feet bgs. Seventeen soil samples were collected at various depths (including the <br /> center of the excavation footprint at 11, 16 and 25 feet bgs) from the 10 boring locations <br /> and one groundwater sample was collected from each boring. ENGEO also sampled a <br /> water supply well located 100 feet southeast of the former AST. <br /> The laboratory reported no detections above reporting limits for soil and groundwater <br /> samples, which were analyzed for analysis of Total Petroleum Hydrocarbons as <br /> gasoline (TPHg), TPH as diesel (TPHd), TPH as motor oil (TPHmo), TPHd and TPHmo <br /> with silica gel filtration preparation, and volatile organic compounds (VOCs). In addition, <br /> selected shallow soil and groundwater samples were analyzed for polychlorinated <br /> biphenyls (PCBs) to address potential impacts from hydraulic fluid. <br /> Based on the current lack of petroleum hydrocarbons in groundwater, groundwater <br /> meets water quality objectives and Water Board staff will not be opening a cleanup case <br /> related to the petroleum hydrocarbon release for this site. <br /> {CARL E. LONGLEY BGD, r.E., CHAIR I PAMELA C. GREECON P.E., SCEE, EXECUTIVE OFFICER <br /> 11020 Sun Center Drive#200.Rancno Cordova,CA 95670 www.watereo9Msca g oW,Antra Walley <br /> �l nmvccc rnrcn <br />