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aUNGEPS OESIGNEPSILON$tIL7AM5 <br /> 1.0 INTRODUCTION <br /> This work plan and quality assurance plan presents the procedures for a field investigation at the <br /> former location of a 500-gallon waste oil underground storage tank (UST) removed from Pep <br /> Boys Store #711, located at 4987 West Lane, Stockton, California. The purpose of the field <br /> investigation is to determine the horizontal and vertical extent of soil contamination and to <br /> determine if groundwater has been impacted by the release of petroleum products from the <br /> former waste oil UST. <br /> 1.1 SITE BACKGROUND <br /> On 1 July 1996 Roy F. Weston, Inc. (WESTON) collected a soil sample from underneath the <br /> waste oil UST fill line and a second sample from the fill line excavation stock pile. Organic <br /> analytes were not detected in these samples. On 18 October 1996 WESTON supervised the <br /> removal of the waste oil UST. During the UST removal WESTON collected a soil sample from <br /> the base of the excavation and from the soil stock pile. Organic analytes detected in the sample <br /> collected from the bottom of the excavation (7 feet below ground surface) included benzene at <br /> 20 ug/kg, toluene at 2,100 ug/kg, ethylbenzene at 1,100 ug/kg, total xylenes at 7,700 ug/kg, and <br /> purgable hydrocarbons as gasoline at 3.3 mg/kg. <br /> In a letter dated 26 February 1997 the San Joaquin County Public Health Services (PHS) <br /> required that Pep Boys submit a work plan by 2 June 1997 for an investigation to determine if <br /> .� groundwater was impacted and the horizontal and vertical limits of soil contamination. In a 10 <br /> March 1997 telephone conversation with WESTON, Mr. Infurna of PHS indicated that during <br /> an investigation of a BP station located down gradient of Store #711 xylene and ethylbenzene <br /> were detected in groundwater at a depth of 65 feet and that Pep Boys is a possible source of the <br /> contamination. Mr. Infurna also indicated that the groundwater table at Store #711 is about 45 <br /> feet below ground surface (bgs) and flows towards the northeast. <br /> 1.2 SCOPE OF WORK <br /> The scope of the field investigation includes: <br /> 1) Obtain drilling permits from PHS. <br /> 2) Notify Underground Service Alert to mark buried utility lines in the vicinity of Store <br /> #711. <br /> 3) Collect soil and groundwater samples from 4 direct push sampling locations. <br /> `�- 4) Prepare a final report. <br /> UPROJECfSTEPBOYSMP 1 January 1997 <br /> V <br />