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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br />CENTRAL VALLEY REGION <br />REVISED MONITORING AND REPORTING ORDER NO. R5-2012-0805 <br />CALIFORNIA WATER CODE SECTION 13267 <br />FOR <br />CONOCOPHILIPS PETROLEUM COMPANY, <br />CHEVRON USA, <br />TEXACO REFINING AND MARKETING INC., <br />L&M PETROLEUM COMPANY, AND <br />MR. BILLY MCKIN NON <br />L&M OPERABLE UNIT <br />SAN JOAQUIN COUNTY <br />This Order is issued to ConocoPhilips Petroleum Company; chevron, USA; Texaco <br />Refining and Marketing Inc.; Tosco Corporation; L&M Petroleum Company; and Mr. Billy <br />McKinnon (hereafter Dischargers) pursuant to California Water Code section 13267, <br />which authorizes the Executive Officer of the California Regional Water Quality Control <br />Board, Central Valley Region (hereafter Central Valley Water Board) to issue a Monitoring <br />and Reporting Order (Order). <br />The Executive Officer finds: <br />INTRODUCTION <br />The Dischargers are jointly responsible for the South Shore Parcels L&M Operable Unit <br />(Site). The L&M Operable Unit was formed as a result of the breakup of the previous <br />joint discharger, the Stockton Group. <br />The Site is located at 666 West Weber Street, Stockton, just south of the Stockton <br />Deep Water Channel. The discharger is responsible for cleanup of the area west of the <br />centerline of former Harrison Street, extending south to Mormon slough and north to the <br />Stockton Deep Water Channel (Figure 1), and the Delta Gateway Apartments. <br />Historical bulk fuel storage/distribution facilities as well as various commercial uses <br />resulted in the release of chemicals to the subsurface. Four distinct groundwater <br />bearing zones exist at the Site: <br />A-zone extends from approximately 5 feet below ground surface (bgs) to 40 <br />feet bgs. <br />B-zone extends from approximately 42 feet bgs to 50 bgs. <br />C-zone extends from approximately 64 feet bgs to 73 feet bgs. <br />D-zone extends from approximately 115 feet bgs to 130 feet bgs. <br />3. Since 1989, the Site has been the subject of numerous investigations and studies. In <br />December 2003, the Dischargers installed a dual phase extraction (DPE) system at the <br />site, which has been in operation since its construction. In 2004, the Dischargers <br />performed pipeline abandonment and removal activities at the site.