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� J <br /> WORK PLAN ADDENDUM <br /> January 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 /> GeoEnvironmental, Inc. (AGE)has prepared this Work Plan Addendum for the site at 1050 Elkhorn <br /> Drive in Stockton, California(the site). The scope of work includes the installation of two soil vapor <br /> extraction/in-situ air sparging and the performance of a soil vapor extraction (SVE) and inn-situ air <br /> sparging(IAS)pilot test. The location of the site is illustrated in Figure I -Location Map. The layout <br /> of the site is depicted in Figure 2 -Site Plan. <br /> This scope of work is being performed in accordance with San Joaquin County Public Health <br /> Department-Environmental Health Division(PHS-EHD)and Central Valley Regional Water Quality <br /> Control Board guidelines for the investigation of underground storage tank(UST) sites. <br /> 2.0. BACKGROUND <br /> One 1,000-gallon gasoline underground storage tank (UST) was removed from the site in 1991. <br /> Total petroleum hydrocarbons quantified as gasoline (TPH-g) and volatile aromatic hydrocarbons <br /> (benzene, toluene, ethylbenzene and xylenes: BTE&JQ were detected in soil samples collected during <br /> the tank removal at concentrations up to 480 parts per million (ppm). <br /> Between 1993 and 1995, six ground water monitoring wells were installed at the site. Petroleum <br /> hydrocarbons have been detected in three of the six monitoring wells. Results of monitoring and <br /> sampling have been reported in Quarterly Reports prepared by AGE. <br /> 3.0. SCOPE OF WORK <br /> 3.1. DRILLING AND SAMPLING <br /> The proposed scope of work includes the drilling and installation of two SVE/IAS wells. The first <br /> well will be installed in the former UST location and the second well is to be located between the first <br /> and MW-2. <br /> Each boring will be advanced utilizing a truck mounted, hollow stem drill rig and 8.25-inch hollow- <br /> stem augers. Proposed locations of the vapor wells are illustrated in Figure 2. Monitoring well <br /> design is illustrated in Figure 3. <br />