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Remedial Action.Work Plan - August 1997 <br /> ELKHORN COUNTRY CLUB <br /> 1050 Elkhorn Drive, Stockton, California <br /> 1.0. INTRODUCTION <br /> In accordance with the request of Mr. Bob Young of Elkhorn Country Club, Advanced <br /> GeoEnvironmental, Inca(AGE) has prepared this Remedial Action Work Plan (RAWP) detailing <br /> design of an in-situ air sparging/soil vapor extraction(IAS/SVE) remediation system for petroleum <br /> hydrocarbon-impacted soil and ground water at 1050 Elkhorn Drive, Stockton, California(the site). <br /> The location of the site is illustrated on Figure 1-Location Map. The layout of existing structures <br /> and the locations of monitoring wells are illustrated in Figure 2 - Remediation Plan. <br /> The RAWP is prepared in accordance with San Joaquin County Public Health Services - <br /> Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control <br /> Board (CVRWQCB) guidelines for corrective action at leaking 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. PREVIOUS INVESTIGATIONS <br /> The following is a brief summary of previous investigations for the former underground storage tank <br /> (UST) location at the site: <br /> • In 1991 one 1,000-gallon gasoline underground storage tank (UST) was removed from the <br /> site. Two soil samples were collected from beneath the tank at a depth of approximately 10 . <br /> feet below surface grade(bsg). Total petroleum hydrocarbons quantified as gasoline(TPH-g) <br /> and volatile aromatics (benzene,toluene,ethylbenzene and xylenes: BTE&X)were detected <br /> in the soil samples at concentrations up to 480 parts per million(ppm). <br /> • In June 1994, one soil boring(B-1) was drilled at the site. The boring was drilled near the <br /> center of the former UST excavation, and advanced to a depth of 38 feet bsg. TPH-g and <br /> BTE&X. were detected in all four soil samples analyzed from boring B-1. The highest <br /> concentration of gasoline, 3,200 ppm, was detected in B-1 at a depth of 30 feet. Ground <br /> water was encountered at 36 feet bsg during drilling. <br /> i <br /> Advanced GeoEnvironmental,Inc. !� <br />