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QUARTERLY REPORT Elkhorn Connti-' Club 1050 Elkhorn Drive Stockton, CA 1liarch 1995 1.0. INTRODUCTION In accordance with a request frons N4x. Bob Yaung of the Ell<hor-n Country Club,,ldvrrncerl. G.eoEnvii'onmental, Inc_ (AGE) has prepared this Quarterly Report. This report details the activities performed during the fii-St 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 as illustrated in Figure 1. A plan of the site is illustrated in Figure,2. 2.0. BACKGROUND 'r;= r 2.1. SITE LOCATION Elkhorn Country Club"is located in a flat rurallresidential area north of Stockton, in San L. Joaquin County, California {Figure 1). The area of ins estigatron is located east of the F'ro Shop, immediately adjacent to the maintenance building (Figu-re 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 frons beneath the tank in depths of 10 and 10.5 feet. The samples were analyzed by a state-certified laboratory for total petroleum hydrocarbons (TPH as gasoline),volatile aroinatics (BTE&X), total lead and ethylene dibroniide (EDB). No EDB or lead were detected in the samples. However; TPH as gasoline and volatile aromatics were detected in the soil samples at concentrations up to 480 parts per million (pprlr). 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 > advanced to a depth of 3S the center of the former underground stoia�Qc, Lank {UST), and a p feet. TPH as gasoline and BTERX were detected at depths between 25 and 35 feet. During drilling, ground water was encountered at 36 feet. Therefore, assessment of the hydrocarbon release in the ground water was warranted and three monitoring wells Were installed at the