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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION MONITORING AND REPORTING ORDER NO. R5-2010-0818 CALIFORNIA WATER CODE SECTION 13267 FOR BP AMERICA SAN JOAQUIN COUNTY This Order is issued to BP America (hereafter Discharger) pursuant to California Water Code section 13267, which authorizes the Executive Officer of the California Regional Water Quality Control Board, Central Valley Region (hereafter Central Valley Water Board) to issue a Monitoring and Reporting Order (Order). The Executive Officer finds: INTRODUCTION 1 . Applied Aerospace Structures is located at 3437 S. Airport Way in Stockton, San Joaquin County (Site). Applied Aerospace Structures was acquired by BP Chemicals, Inc., now called BP America. Investigations have shown that discharges of waste resulting from past operations at the Site have adversely affected Site groundwater. BP America is performing cleanup at the Site. 2. Investigations have shown that elevated levels of volatile organic compounds (VOCs) are present in groundwater at the Site. Groundwater flows generally to the east and is approximately 40 feet below ground surface. This pollution has impaired the beneficial use of groundwater resources at the Site. 3. The Discharger implemented corrective action measures in 1999, including a soil vapor extraction (SVE) system and a groundwater extraction and treatment system (GWETS). The SVE system operated until December 2000. The GWETS continues to operate to achieve gradient control and to remove pollutants from the groundwater. The extracted groundwater is treated by carbon filters and discharged under permit to the City of Stockton sanitary sewer system. 4. This Monitoring and Reporting Program (MRP) is issued by the Central Valley Water Board, pursuant to California Water Code (CWC) section 13267 and is necessary to determine whether remediation efforts are effective. 5. Existing data and information about the Site show the presence of various chemicals, including trichloroethylene (TCE), emanating from the property under the control of the Discharger. The Discharger is responsible for the discharge because the Discharger formerly owned the property. 6. 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. R5-2003-0703, which was issued on 27 March 2003.