ARCHIVED REPORTS_QUARTERLY GROUNDWATER MONITORING REPORT 1ST QUARTER 2016

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' CALIFORNIA REGIONAL WATERQUALITY CONTROLBOARD CENTRAL VALLEY REGION MONITORING AND REPORTING PROGRAM NO.R5-2004-0820 CALIFORNIA WATER CODE SECTION 13267 FOR SOUTH SHORE PARCELS,L&M OPERABLE UNIT CONOCOPHILLIPS PETROLEUM COMPANY;CHEVRON,U.S.A.; TEXACO REFINING AND MARKETING,INC.;TOSCO CORPORATION; L&M PETROLEUM COMPANY,INC.;AND MR.BILLY MCKINNON STOCKTON,SAN JOAQU N COUNTY C000coPhillips Petroleum Company;Chevron,U.S.A.;Texaco Refining and Marketing,Inc.;Tosco Corporation; L&M Petroleum Company,Inc.; and Mr.Billy McKinnon,collectively hereafter referred to as Discharger, are jointly responsible for the South Shore Parcels L&M Operable Unit(OU)formed as a result of the breakup of the Stockton Group. The other corporations associated with the former Stockton Group are responsible for the Unocal OU and Morton OU. The Discharger is responsible for cleanup of the area west of the midline of the former Harrison Street,with the midline extending south to Mormon Slough and north to the Stockton Deep Water Channel,which is shown on Figure 1,and the Delta Gateway Apartments. Historically,bulk fuel storageldistribution facilities,various commercial uses,and residential buildings occupied these areas,which resulted in releases of chemicals to the subsurface. This pollution impaired the beneficial use of this water resource, The Discharger owned andlor operated petroleum storageldistdbution facilities on Parcel 2A,which is owned by the Stockton Redevelopment Agency. Groundwater is about 1'5 feet below ground surface. The Discharger is currently operating a dual phase extraction(DPE)system to remove separate phase hydrocarbons(SPH). . This Monitoring and Reporting Program(MRP)is issued pursuant to Section 13267 of the California Water Code and is necessary to delineate groundwater pollutant plumes and determine whether remediation efforts are effective. Existing data and information about the site show the presence of various chemicals,including total petroleum hydrocarbons(TPH)as gasoline,TPH as diesel,TPH as motor oil,benzene, toluene,ethylbenzerte,xylenes,metals,volatile organic compounds,and semi- volatile organic compounds emanating from the property due to the Discharger's past operations. The Discharger shall not implement any changes to this MRP unless and until a revised MRP is issued by the Executive Officer. This MRP replaces the requirements listed in MRP No.R5-2003-0802,which was issued on 27 January 2003. Prior to construction of any new groundwater monitoring or extraction wells,and prior to destruction of any groundwater monitoring or extraction wells,the Discharger shall submit plans and specifications to the Board for review mrd approval. Once installed,all new wells shall be added to the monitoring program and shall be sampled and analyzed according to the schedulb below. GROU"W ATER MONITORING As shown on Figure 1,there are 53 monitoring wells associated with the three OUs. Two of the monitoring wells are either missing or damaged. Forty of the 53 wells are associated with the area owned/operated by the Discharger. Of the 40 wells,there are 12 wells associated with the DPE system, 20 shallow zone monitoring wells,and eight deeper water bearing zone monitoring wells. The groundwater monitoring program for the 40 wells and any wells installed subsequent to the issuance of this MRP,shall follow the schedule below. Monitoring wells with SPH or visible sheen shall be monitored, at a minimum,for product thickness and depth to water. The volume of extracted