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Eoeuao G.Bnovm JR. <br /> aoa <br /> ovn� <br /> o au e oa+i. MA VNEw Rovx,eula <br /> rMr 1. <br /> B <br /> Water Boards �YeiNtXr OROtL!' <br /> Central Valley Regional Water Quality Control Board <br /> 7 April 2014 <br /> Mr. Dan Schreiner <br /> Stantec <br /> 3017 Kilgore Road, Suite 100 <br /> Rancho Cordova, CA 95670 <br /> COMMENTS ON 7 MARCH 2014 MEETING—L&M OPERATING UNIT, STOCKTON, SAN JOAQUIN <br /> COUNTY <br /> Thank you for meeting with us here at the Central Valley Regional Water Quality Control Board (Central <br /> Valley Water Board) on 7 March 2014. During the meeting, we discussed the following items: <br /> • L&M Group's (Group) proposal to perform a rebound test of the Soil Vapor Extraction (SVE) <br /> system at the Delta View Apartment complex: <br /> o The SVE system has not been operating since November 2013 due to the malfunction <br /> of an LEL sensor. <br /> • SVE system construction details. <br /> • Review of historical and current soil vapor data. <br /> • Potential system optimization and verification sampling. <br /> We agreed on the following Action Items to be submitted by the L&M Group: <br /> • L&M Group will submit a proposal to remove the existing onsite SVE/DPE remedial equipment. <br /> System piping, manifolds, and other infrastructure will remain to allow for system optimization to <br /> occur using a mobile treatment unit, if necessary. <br /> • L&M Group will submit a work plan identifying additional soil vapor sampling locations to confirm <br /> the source area has been cleaned up: <br /> o Samples will be collected in accordance with DTSC's October 2011 soil gas sampling <br /> guidance. <br /> o Naphthalene soil vapor samples must have a detection level of at least 32 Ng/m3. <br /> Central Valley Water Board staff understands that the system will remain off pending the results of the <br /> upcoming rebound test data. Please submit the proposal to remove equipment and a work plan <br /> identifying the locations of additional soil vapor samples and the system upgrade specifications to this <br /> office by 30 May 2014. <br /> KFPL E. LONGLEY SOD, P.E.. CHAIR I PANE"C.CREEOON P.E.,8GEE,EXECUTIVE OFFICER <br /> 11020 Sun Center Dove 4200,Rancho Cordova,CA 95870 1 www waterboaraa.".goV/cantratvallay <br /> r,AlCYOLle.ev[n <br />