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' RECEVED AUG 13 2002 SECOR 16 August 7, 2002 ENVIRONMENT HEALTH International Incorporated t Mr. James Barton PERMIT/SERVICES California Regional Water Quality Control Board Central Valley Region 3443 Routier Road, Suite A Sacramento, California 95827-3098 ' SECOND QUARTER 2002 GROUNDWATER MONITORING REPORT, TOWER PARK MARINA, 14900 WEST HIGHWAY 12,LODI, CALIFORNIA ' Dear Mr, Barton: On behalf of Tower Park Marina Investors LP and Westrec Marinas Management, Inc., SECOR International Incorporated (SECOR) is submitting this Second Quarter 2002 Groundwater Monitoring ' Report for Tower Park Marina (the Marina), located at 14900 West Highway 12 in Terminous (near Lodi), California (the Site, see Figure 1, Site Location Map). We are providing this document to the California Regional Water Quality Control Board, Central Valley Region (RWQCB), in accordance with ' the RWQCB's Monitoring and Reporting Program (MRP)No. R5-2002-0824 dated July 18, 2002. BACKGROUND ' The Site is an operating marina situated on a levee along Potato Slough and operates aboveground storage tanks (ASTs), a roadside fuel dispenser for fueling automobiles/trailered-boats, and dockside fuel dispensing facilities for fueling boats (Figure 2). Petroleum hydrocarbon-impacted soil was observed during AST and underground conveyance line replacement activities on the levee in September 1991. Pressure testing prior to line replacement activities indicated the potential presence of leaks from the roadside gasoline dispenser, unleaded and regular gasoline pipes leading from the roadside dispenser to ' the manifold near the shop office (manifold), the premix line from the AST area to the manifold, and the diesel piping leading from the manifold to the docks. The diesel pipe leading from the manifold to the dock area was excavated and a damaged coupling was found just outside of the shop office; the coupling ' was replaced. No visible signs of leaks, surface stains, or sheen on the water in the slough were found. Subsurface investigative activities were first conducted at the Site in November 1991; soil samples ' submitted for laboratory analysis confirmed the presence of petroleum hydrocarbon-impacted soil beneath the conveyance lines. The highest levels of petroleum hydrocarbons were found in the soil sample collected near the roadside dispenser; this sample contained 150 milligrams per kilogram (mg/kg) of total ' petroleum hydrocarbons as gasoline(TPHg),30 mg/kg of total petroleum hydrocarbons as diesel (TPHd), and 25.67 mg/kg of benzene, toluene, ethyl benzene,and xylenes (BTEX) constituents. In January 1992, a geophysical survey was conducted to assess the presence and extent of underground ' piping systems; a soil vapor survey was conducted to evaluate the presence of petroleum hydrocarbons in the subsurface and to select boring locations. The results of the soil vapor survey indicated an apparent area of free product on the levee, which extended from the fuel dispenser(near MW-3)westward towards ' well MW-5. The geophysical survey identified an abandoned sewer line located parallel to the building fronting the slough, which presumably acted as a preferential pathway for contaminant transfer. In May and June 1993, ten soil borings were advanced to depths ranging between 15 to 25 feet below ground surface; soil samples from two of the borings contained TPHg at concentrations up to 1,200 Ing/kg (in boring B-2 located near the roadside dispenser), soil samples from three of the borings were ' found to contain TPHd at concentrations up to 89 mg/kg (in well MW-3), and soil samples from three of ' I:\Tower Park\QMR\2002 QMR\Q2_2002\2nd QTR 2002.doc SECOR International Inc. 57 Lafayette Circle, 2nd Floor, Lafayette, CA 94549-4321 925 299-9300 925 299-9302 Fax www.secor.com