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-------------- <br /> 7 <br /> rx <br /> �.. QUARTERLY REPORT <br /> September 1995 <br /> Elkhorn Country Club <br /> 1050 Elkhorn Drive <br /> Stockton, California <br /> 1.0. INTRODUCTION <br /> In accordance with a request from Mr. Bob Young of Elkhorn Country Club, Advanced <br /> r:. GeoEnvironmental, Inc. (AGE) has prepared this Quarterly Report for field activities performed <br /> -:� during the third quarter of 1995 at 1050 Elkhorn Drive in Stockton, California(the site). The scope <br /> of work included the monitoring, purging and sampling of each monitoring well at the site. The <br /> "3 location of the site is illustrated in Figure 1 -Location Map. The layout of the site is depicted in <br /> Figure 2 -Site Plan. <br /> The monitoring and sampling are performed in accordance with the guidelines established by the Tri-; <br /> Regional Board and San Joaquin County Public Health Department -Environmental Health Division <br /> (PHS-EHD) for investigation of underground storage tank sites. <br /> 2.0. BACKGROUND <br /> 2.1. SITE LOCATION <br /> Elkhorn Country Club is located in a flat rural/residential area north of Stockton, San Joaquin <br /> County, California(Figure 1). The area of investigation is located east of the Pro Shop, immediately <br /> adjacent to the maintenance building and driving-range (Figure 2). <br /> 2.2. UNDERGROUND STORAGE TANK REMOVAL <br /> It is our understanding that one 1,000-gallon gasoline underground storage tank(UST) was removed <br /> from the site in 1991. Two soil samples were collected from beneath the tank at a depth of, <br /> approximately 10 feet. The samples were analyzed by a state-certified laboratory for total petroleum <br /> hydrocarbons quantified as gasoline (TPH-g), volatile aromatic hydrocarbons (benzene, toluene, <br /> ethylbenzene and xylenes: BTE&X), total lead and ethylene dibronude(EDB). No EDB or lead were <br /> detected in the samples. However, TPH-g and volatile aromatics were detected in the soil samples <br /> at concentrations up to 480 parts per million(ppm). <br /> 2.3. MONITORING WELL INSTALLATION AND ASSESSMENT <br /> On 20 June 1994, one soil boring(B-1)was drilled at the site. The boring was drilled near the center <br /> of the former underground storage tank (UST), and advanced to a depth of 3 8 feet below surface <br />