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r� I•t SITE CONTAMINATION WORK PLAN 7001 Rand Road Lodi, California 1. 0 INTRODUCTION In accordance with a request from Ms. Patricia Duncan, Geological Audit Services, Inc. (GeoAudit) has prepared this work plan for the preliminary investigation of soil and groundwater contamination at 7001 Rond Road, Lodi, California (the site) . 2 . 0 BACKGROUND 2 .1 Site Location The site is located on a ranch in a rural area of northern San Joaquin County (Figure 1) . A house, barn, shop and numerous storage buildings are located on the property (Figure 2) . 2 .2 UST Removal One 1, 000-gallon gasoline and one 500-gallon diesel underground storage tanks (UST' s) were removed from the property in March 1992 . Contamination was detected in soil samples collected from beneath the UST' s at levels to 900 lig/kg (parts per billion, ppb) . In a letter dated June 30, 1992 from the San Joaquin County Public Health Services - Environmental Health Division (PHS/EHD) stated "the presence of contaminants at your facility [7001 Rond Road) exceed the allowable limits of leaching potential as recommended by the LUFT Manual. The former underground storage tanks (UST) cannot be recommended for final closure without further investigation to determine the full extent of the soil and/or groundwater problem. " 2 .3 Groundwater Depth and Gradient According to the San Joaquin County Flood Control Map (Fall, 1990) , depth to groundwater in the area is between 10 and 20 feet. The regional groundwater gradient is towards the west or southwest. 3.0 SCOPE OF WORK To perform a preliminary investigation of the extent of soil and groundwater contamination at the site, GeoAudit proposes to drill one soil boring to a depth of approximately 30 feet. Areas north and west of the tank excavation are not accessible by a drill rig because of structures that are present. Therefore, the boring will be drilled immediately southwest of the tank 1