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<=< QUARTERLY REPORT ! Elkhorn Country Club 1050 Elkhorn Drive Stockton, CA I June 1995 r= 1 A. INTRODUCTION E In accordance with a request from Mr. Bob Young of Elkhorn Country Club, Advanced GeoEnvironmental,Inc. (AGE) has prepared this Quarterly Report. This report details the activities la performed during the second quarter of 1995 at 1050 Elkhorn Drive in Stockton, California (the site). Each monitoring well at the site was purged and sampled. The location of the site is illustrated in Figure 1. A plan of the site is illustrated in Figure 2. The monitoring and sampling is performed in accordance with Tri-Regional Board and San Joaquin County Public Health Department -Environmental Health Division(PHS-EHD) guidelines for the investigation of underground storage tank sites. I` s . 2.0. BACKGROUND 2.1. SITE LOCATION Elkhorn Country Club is located in a flat rural/residential area north of Stockton, San Joaquin i1 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. UST 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 tank at depths of 10 and 10.5 feet. The samples were analyzed by a state-certified laboratory for total petroleum hydrocarbons quantified as gasoline(TPH-g), volatile aromatics (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 volatile aromatics were detected in the soil samples at concentrations up to 480 parts per million(ppm). I 2.3. MONITORING WELL INSTALLATION AND ASSESSMENT - On 20 June 1994, one soil boring(B-1)was drilled at the site. The boring was drilled near the center