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GROUNDWATER MONITORING Chevron Environmental Management Company (Discharger) owns and operates a bulk fuel terminal at 22888 South Kasson Road in Banta (site). The active fuel terminal has nine aboveground fuel storage tanks, tank-truck loading racks, above and below ground piping, an office building, and other structures used for storage. Operations at the terminal resulted in petroleum hydrocarbon pollution of soil and groundwater. This pollution impaired the beneficial use of this water resource. Depth to first encountered groundwater is about six feet below ground surface. There are two water bearing zones identified as A and B. The A water bearing zone is divided into the upper A zone (UA) and the lower A zone (A). The groundwater is polluted with both separate and dissolved phase petroleum hydrocarbons. 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, benzene, toluene, ethylbenzene, xylenes, methyl tertiary butyl ether (MTBE), tertiary butyl alcohol (TBA), and tertiary amyl methyl ether (TAME) 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 This MRP replaces the requirements listed in MRP No. R5-2007-0829, which was issued on 29 November 2007 and is hereby rescinded. As shown on Site Plan (attached), there are 63 A-zone monitoring wells, 18 B-zone wells, an extraction well, and a water supply well that are sampled. The groundwater monitoring program for the 83 wells, and any wells installed subsequent to the issuance of this MRP, shall follow the schedule in Table 1 (attached). Wells with free phase petroleum product or visible sheen shall be monitored for product thickness and depth to water only. Sample collection and analysis shall follow standard EPA protocol. 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. MONITORING AND REPORTING PROGRAM No. R5-2007-0829 (REVISED) CALIFORNIA WATER CODE SECTION 13267 FOR CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION CHEVRON ENVIRONMENTAL MANAGEMENT COMPANY BULK FUEL TERMINAL # 1001621 BANTA, SAN JOAQUIN COUNTY