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R CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION MONITORING AND REPORTING PROGRAM NO. BP OIL COMPANY, TOSCO REFINING COMPANY, AND ST SERVICES BULK FUEL TERMINAL SAN JOAQUIN COUNTY Prior to 1989, Mobil Oil Corporation owned and operated the bulk fuel terminal at 3505 Navy Drive on the northeastern portion of Rough and Ready Island in Stockton. BP Oil Company operated the terminal from 1989 through August 1994. Tosco Refining Company operated the terminal from September 1989 through October 1998. Thereafter, ST Services has been operating the terminal for storage of diesel fuel only. Facility operations have resulted in petroleum hydrocarbon pollution of soil and groundwater beneath the facility. Groundwater is first d encountered at about 10 feet below ground surface. Local groundwater flow is generally to the west-southwest. However, a mound in near monitoring well(MW) 11 causes groundwater from this point to flow in all directions. This Monitoring and Reporting Program (MRP) is issued pursuant to Section 13267 of the California Water Code and is designed to delineate groundwater pollutant plumes and determine whether remediation efforts are effective. BP Oil Company,Tosco Refining Company, and ST Services (hereafter 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 Ell MRP No. 92-803,which was issued on 17 December 1992. Prior to construction of any new groundwater monitoring or extraction wells, the Discharger shall submit plans and specifications to the Board for review and approval. Once installed, all new wells shall be added to the monitoring program and shall be sampled and analyzed according to the schedule below. GROUNDWATER MONITORING Figure 1 shows there are 13 groundwater MWs, one of which has been decommissioned(MW 7). All the MWs are screened in the shallow groundwater zone. MWs with free phase petroleum product or visible sheen shall be monitored for product thickness and depth to groundwater only. The groundwater monitoring program for the 12 MWs shall follow the schedule below. Any wells installed subsequent to the issuance of this MRP shall be monitored quarterly for depth to groundwater; total petroleum hydrocarbons as diesel and gasoline; benzene, toluene, ethylbenzene, and xylenes; lead; and fuel oxygenates, including methyl tertiary butyl ether (MTBE), di-isopropyl ether(DIPE), ethyl tertiary butyl ether(ETBE), tertiary amyl methyl ether (TAME), tertiary butyl alcohol (TBA), ethanol, and methanol. If results are nondetectable for lead and fuel oxygenates in a well,no further monitoring is required for these constituents. If lead or a fuel oxygenate is detected, it shall be added to the quarterly monitoring program for the well in which it was detected. Sample collection and analysis shall follow standard EPA protocol.