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r..r S.,/ CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION REVISED MONITORING AND REPORTING PROGRAM NO. 95-802 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, and xylenes (BTEX) due to leaks in several areas of the facility. Of five monitoring wells on the property, one well(MW-3) contains free-phase product at historic thicknesses up to 0.40 ft. Product thickness measurement and removal occur on a weekly basis by Marina personnel. 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 on a weekly basis, as consistent with current activities. Currently, MW-3 is the only well with free-phase product present. However, if free-phase product is observed in additional Site wells, product thickness measurements and removal in those wells shall occur on a weekly basis. 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-phase petroleum product or visible sheen shall be monitored for product thickness and depth to groundwater only. Sample collection and analysis shall follow standard EPA protocol.