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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION MONITORING AND REPORTING PROGRAM NO. R5-2003-0801 FOR CHEVRON ENVIRONMENTAL MANAGEMENT COMPANY ALDEN PARK, TRACY SAN JOAQUIN COUNTY Petroleum hydrocarbon constituents have been detected in soil and groundwater at the former ChevronTexaco (Discharger) site at Alden Park in Tracy, California, a fuel oil (Bunker C) site. The site was decommissioned and Alden Park was constructed as part of a residential development. Groundwater monitoring and remediation at the site has been conducted by ChevronTexaco since 1987. 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. Total petroleum hydrocarbons, quantified as diesel (TPH-d) and polycyclic aromatic hydrocarbons (PAHs) have been detected in groundwater samples collected from the site. 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. 97-801, which was issued on 4 March 1997. Prior to construction of any new groundwater monitoring or extraction wells, and prior to abandonment of any groundwater monitoring or extraction wells, the Discharger shall submit plans and specifications to the Board for review and approval by the Executive Officer. 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 As seen on Figure 1, there are 21 monitoring wells associated with this site (MW-1/KJC, MW-1, MW-2, MW-3, MW-4, MW-5,MW-6, MW-7, MW-8, MW-9, MW-10,MW-11, MW-12, MW-13, MW-14, MW-15, MW-16, MW-17, MW-18, MW-20, and MW-21). The groundwater monitoring program for the 21 monitoring wells and any wells installed subsequent to the issuance of this MRP shall follow the schedule below. Monitoring wells with free phase petroleum and/or visible sheen (MW-1, MW-3,MW-6, MW-15, MW-16, MW-18, and MW-20) shall be monitored for product thickness only. Sample collection and analysis shall follow standard EPA protocol.