SITE INFORMATION AND CORRESPONDENCE

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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION MONITORING AND REPORTING PROGRAM NO. 5-00-824 4 FOR TOWER PARK MARINA SAN JOAQUIN COUNTY The Tower Park Marina (Site) is at 14900 West Highway 12 in Terminous (near Lodi), San Joaquin County. The Site is an operating marina situated on a levee along Potato Slough and operates aboveground tanks (AGTs), a roadside fuel dispenser, and a dockside fuel dispenser. Groundwater is contaminated with total petroleum hydrocarbons as diesel (TPHd) and benzene, toluene, ethylbenzene, andxylenes (BTEX)'due- to'l" aks-ii the underground conveyance Ti fizi-pio,und in 1991. Subsequently, double-contained underground conveyance lines and related appurtenances were installed to replace leaking lines and couplings. Of five monitoring wells on the property, one well (MW-3) contains free product at historic thicknesses up to 0.4 feet. Marina personnel measure free product thickness.and remove free product in wells containing free product. This Monitoring and Reporting Program (MRP) is issued pursuant to Section 13267 of the California Water Code and is designed to delineate groundwater contaminant plumes and determine whether . remediation efforts are effective. 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 groundwater monitoring requirements listed in the MRP No. 95-802 dated 17 January 1995. 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 Table 1. GROUNDWATER MONITORING As shown on Figure 1, there are currently five monitoring wells at the Tower Park Marina. MW-1,MW- 2, MW-3, MW-4, & MW-5 shall be monitored for depth to groundwater on a quarterly basis. Product thickness measurements and product removal shall continue as needed. Currently, MW-3 is the only well with free product present. However,if free product is observed in additional Site wells, free product thickness measurements and removal in those wells shall occur as needed. "As needed" means there_ is a sheen or measurable volume of free product present in the well. The groundwater monitoring program for wells MW-1, MW-2, MW-3, and MW-4 and any wells installed subsequent to issuance of this MRP, shall include the list below. Monitoring wells with free product or visible sheen shall be monitored for free product thickness and depth to groundwater only. Sample collection and analysis shall follow standard EPA protocol.