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0 {r��y 0 �(( <br /> L/ ECOV rj "�-f 1 GG LHNUIHG. BHl/Y1N JH. <br /> MAR 1 7 2014 MATH P R pOR104EZ <br /> WaterBoards LII/iRONM LNTAL PRUTLCTIOIi <br /> Central Valley Regional Water Quality Control Board PERMIT/SERVICES <br /> 14 March 2014 <br /> Mr. Donald Rodgers <br /> 11900 South Union Rd. <br /> Manteca, CA 95336 <br /> THE TRANSMISSION STORE, 515 WEST CHARTER WAY, STOCKTON, SAN JOAQUIN COUNTY <br /> (REGIONAL BOARD CASE#390891) <br /> The California Regional Water Quality Control Board-Central Valley Region (Central Valley Water Board) <br /> staff reviewed the Second Semi-Annual Groundwater Monitoring Report 2013 (Report) submitted on your <br /> behalf by Advanced GeoEnvironmental Inc. (AGE) on 10 February 2014. Groundwater monitoring is <br /> consistent with previous sampling events and results indicate that the groundwater plume is not declining <br /> in concentration under active remediation. AGE recommends continuing the limited groundwater <br /> monitoring, and operation of the soil vapor extraction/air sparging treatment system while conducting an <br /> evaluation of additional technologies to treat the dissolved plume. <br /> We concur to AGE's recommendations. In the Report, AGE did not indicate if maintenance of the <br /> SVE/AS system had been conducted during the second half of 2013, therefore we cannot determine if <br /> system optimization has been performed. After our review of the Second Semi-Annual Remediation <br /> Status Report 2013, which is due 30 April 2014, we may request the evaluation of additional <br /> technologies to treat the dissolved plume which may include a work plan to conduct a pilot study of the <br /> preferred remedy. <br /> We also request that AGE optimize the SVE/AS treatment system in an attempt to increase the efficiency <br /> of the SVE/AS system, and report the effectiveness of those efforts in the next semi-annual remediation <br /> status report and groundwater monitoring report, which is due 30 July 2014. <br /> If you have any questions or comments, you may call (916) 464-4615 or email <br /> ibarton(cr_waterboards.ca.gov. <br /> JAMES L.L. BARTON, P.G. <br /> Iv <br /> Engineering Geologist <br /> cc: Nuel Henderson, San Joaquin County Environmental Health Department, Stockton <br /> William Little, Advance GeoEnvironmental, Inc., 837 Shaw Rd. Stockton 95215 <br /> KARL E. LCNCLEY SCD, P.E., CHAIR I PAMELA C. CnEu)rm P.E., BCEE, CXCCUTIVC CrriCCn <br /> 11020 Sun Center Drive#200.Rancho Cordova,CA 35670 ; www.waterboards,ca.gov/centralvalley <br /> L9 NYC:\'Ci[U 1—r.n <br />