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ECMl1ND G. BROWN JR. <br /> • 6CVERHCR <br /> CAI 1 E O R N 1 n SEC EHEW ORDRIGUEZ <br /> WaterBoards ENVIRDNMENinL AROTECIIQN <br /> Central Valley Regional Water Quality Control Board <br /> 11 May 2012 <br /> L&M Group <br /> c/o Mr. Dan Schreiner <br /> Stantec Consulting Services, Inc. <br /> 3017 Kilgore Road, Suite 100 <br /> Rancho Cordova, CA 95670 <br /> REVISED MONITORING AND REPORTING PROGRAM, L&M OPERABLE UNIT, SAN <br /> JOAQUIN COUNTY <br /> The L&M Group (Group) is monitoring groundwater at the L&M Operable Unit under Monitoring <br /> and Reporting Program (MRP) No. R5-2004-0820 due to a release of Total Petroleum <br /> Hydrocarbons (TPH) and various other contaminants. In a meeting on 8 August 2011, the <br /> Group requested a revision to the existing MRP. Central Valley Regional Water Quality Control <br /> Board (Central Valley Water Board) staff revised the MRP based on that meeting and <br /> subsequent discussions. <br /> After review of the historical groundwater data, Central Valley Water Board staff concur that the <br /> monitoring frequency can be revised as shown in the table below: <br /> Quarter) Semi-annual) Annual) <br /> MW-9, 16-20, 42, 43, 46-52, MW-21, 22, 31, 56, 58, 61 MW-23-28, 34, 35, 44, 45 <br /> 54, 55, 57, 59, 60, 62-74, <br /> 2AMW-12-14 <br /> Revised MRP No. R5-2012-0805 is now in effect. The next required quarterly report is due 1 <br /> August 2012. A copy of the new MRP is included for your records. If you have any questions <br /> in regard to this matter, you may contact me at 916.464.4682 or by email at <br /> rcervantesCcDwaterboards.ca.gov. <br /> Roberto Cervantes, PE <br /> Private Sites Cleanup Unit <br /> Enclosure <br /> cc: Mr. Eric Hetrick, ConocoPhillips <br /> Mr. Rick Rittenberg, Chevron Environmental Management Company <br /> Mr. Robert Goodman, Rogers Joseph O'Donnell <br /> KARL E. LONOLEY SCR, P.E.,CHAIR I PAMELA C. CREEDON P,E., BCEE,EXECUTIVE OFFICER <br /> 11020 Sun Center Drive 0200,Rancho Cordova,CA 95870 1 www.waterboards.ca.govlce ntralvallBY <br /> ('#RECYCLED PAPER <br />