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QUARTERLY REPORT AND CORRECTIVE ACTION PLAN May 1996 Elkhorn Country Club 1050 Elkhorn Drive Stockton, California -1 1.0. INTRODUCTION AND SCOPE OF WORK In accordance with a request from Mr. Bob Young of Elkhorn Country .Club, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Corrective Action Plan(CAP) for 1050 Elkhorn Drive, Stockton, California (the site). The scope of work included the installation of soil vapor extraction/in-situ air sparging wells, conducting feasibility studies and quarterly ground water monitoring. The location of the site is illustrated in Figure 1 - Location Map. The layout of the site << is depicted in Figure 2 - Site Plan. Field activities were performed in accordance with the guidelines established by the Central Valley r< Regional Water Quality.Control Board (CVRWQCB) and the San Joaquin County Public Health Department- Environmental Health Division (PHS-EIID) for investigation of underground storage tank (UST) sites. 2.0. BACKGROUND 2.1. SITE LOCATION Elkhorn Country Club is located in a rurallresidential area of low topographic relief north of _! Stockton, San Joaquin County, California.(Figure 1). The area of investigation is located east of the _ Pro Shop, immediately adjacent to the maintenance building and driving range (Figure 2). 2.2. UNDERGROUND STORAGE TANK REMOVAL It is our understanding that one 1,000-gallon gasoline underground storage tank(UST)was removed from the site in 1991. Two soil samples were collected from beneath the former tank location at a depth of approximately 10 feet below surface grade (bsg). The samples were analyzed by a state- certified laboratory for total petroleum hydrocarbons quantified as gasoline (TPH-g), volatile aromatic hydrocarbons (benzene, toluene, ethyl .benzene and xylenes: BTE&X), total lead and ethylene dibromide (EDB). No EDB or lead were detected in the samples.However, TPH-g and BTE&X were detected in the soil samples at concentrations up to 480 parts per million (ppm, reported as milligrams per kilogram).