SITE INFORMATION AND CORRESPONDENCE

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r CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION MONITORING AND REPORTING PROGRAM NO. R5-2002- 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(Figure 1). The Site, owned by Westrec Properties (Discharger), 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), total petroleum hydrocarbons as gasoline (TPHg), methyl tert-butyl ether (MtBE), and benzene, toluene, ethylbenzene, and xylenes (BTEX) due to leaks in the underground conveyance lines found in 1991. Subsequently, double-contained underground conveyance lines and related appurtenances were installed to replace leaking lines and couplings. Of five monitoring wells (Figure 2) on the property, one well (MW-3) contained free product at historic thicknesses up to 0.4 feet. Marina personnel measured free product thickness and remove free product in wells containing free product, using absorbent socks. Free product is no longer present in MW-3. This Monitoring and Reporting Program (MRP) is issued pursuant to Section 13267 of the California Water Code and is necessary to delineate groundwater contaminant plumes and determine whether remediation efforts are effective. Existing data and information about the Site shows the presence of various chemicals, including petroleum hydrocarbons TPH-d and TPH-g, BTEX, and fuel oxygenates emanating from the property resulting from the Discharger's operation. 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. 5-00-824, which was issued on 19 June 2000. 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 2, there are currently five monitoring wells at the Tower Park Marina. MW- 1, MW-2, MW-3, MW-4, and MW-5, and any wells installed subsequent to issuance of this MRP shall be monitored for depth to groundwater on a quarterly basis. Monitoring wells with free phase petroleum product or visible sheen shall be monitored for product thickness and depth to water only. If free product is observed in any 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. Sample collection and analysis shall follow standard EPA protocol.