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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION MONITORING AND REPORTING PROGRAM NO. R5-2002-0838 FOR VOLK FARM SAN JOAQUIN COUNTY Volpi Farm(site) is located approximately four miles southwest of Holt in San Joaquin County. The current property owner, Mr. Herbert A. Specman and additional responsible parties, A. Volpi And Sons, Inc. and Witting Weltch, are hereafter named as Discharger. During a preliminary site assessment conducted in June 1998, two leaking above-ground storage tanks (AGTs) and an area used for waste oil handing and possible disposal were identified. In September 1999,the AGTs and polluted soil were removed from the site, and six groundwater monitoring wells were installed(Figure 1). Groundwater pollutants include total petroleum hydrocarbons as gasoline (TPH-g), as diesel (TPH-d), and as motor oil(TPH-mo); fuel oxygenates, including methyl tert- butyl ether(MtBE); and benzene-toluene-ethylbenzene-xylenes (BTEX). On 5 December 2001, Regional Board staff requested the installation of one additional well downgradient of the groundwater plume. 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 shows the presence of various chemicals, including TPH-g, TPH-d, TPH-mo, fuel oxygenates (including MtBE), and BTEX, in groundwater resulting from the Discharger's current or past operation. The Discharger shall not implement any changes to this MRP unless and until a revised MRP is issued by the Executive Officer. 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 As shown on Figure 1, there are seven monitoring wells,MW-1 through MW-7 at the site. The groundwater monitoring program for the seven monitoring wells and any wells installed subsequent to the issuance of this MRP, shall follow the schedule below. Monitoring wells with free phase petroleum product or visible sheen.shall be monitored for product thickness and depth to water only. The volume of extracted groundwater also shall be provided in quarterly monitoring reports. Sample collection and analysis shall follow standard EPA protocol.