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Preliminary Site Assessment Work Pian <br /> Former BOB'S MUFFLER SHOP' <br /> 466 Moffat Road, Manteca, California <br /> ' 1.0. INTRODUCTION <br /> At the request of Mr. Tom Barbour, on the behalf of Ms. Amelia 'Barbour, Advanced <br /> tGeoEnviromriental, Inc. (AGE) has prepared the enclosed Work Plan for the Bob's Muffler Shop <br /> site located at 466 Moffat Road, Manteca, California. The location of the site is illustrated on <br /> Figure 1 - Location Map. A plan of the site is illustrated on Figure 2 •- Site Plan. <br /> This Work Plan has been prepared as required by the San Joaquin County Public Health Services - <br /> Environmental Health Division (PHS-EHD) to evaluate an unauthorized release of petroleum <br /> hydrocarbon compounds from underground storage tanks .(USTs) fonnerly located at the site. <br /> Additionally, this work plan is prepared in accordance with PHS-EHD and Central Valley Regional <br /> Water Quality Control Board (CVRWQCB) guidelines for the investigation of UST sites. <br /> The purpose of this site assessment is to evaluate the lateral and vertical extent of petroleum <br /> t Hydrocarbon impacts to.soil and groundwater at the site. This Work Plan provides a description of <br /> the scope of work and procedures to be used in soil probe borings, soil and.groundwater sample <br /> collection and analysis, soil boring abandonment, and ground water monitoring well installation.' <br /> 2.0. BACKGROUND <br /> ' It is our understanding that one' 10,000-gallon regular gasoline UST one 8,000-gallon unleaded <br /> i <br /> gasoline UST and one 550-gallon waste oil UST were removed from the site in 1988. During UST <br /> ' removal activities, soil samples were collected and analyzed from beneath the ends of each UST. <br /> Total xylenes were detected at a concentration of 230 micrograms per kilogram (,Ug/kg) in a soil <br /> sample collected from the base of the gasoline UST Tank No. 2 excavation at a depth of 15 feet <br /> below surface grade (bsg). Total petroleum hydrocarbons.quantified as motor oil (TPH-mo) was <br /> detected at a concentration of 97 milligrams per kilograms (mg/kg) in a soil sample collected at a <br /> ' depth of 12 feet bsg from the base of the waste oil UST (Tank'No. 3) excavation. However, <br /> laboratory detection limits were elevated and may not have indicated low concentrations of <br /> petroleum hydrocarbon compounds above standard reporting levels. According to a PHS-EHD <br /> ' inspection report, soil discoloration and petroleum hydrocarbon odors were noted beneath USTs <br /> Tank No. 1 and No. 2. <br /> ' 2.0. SCOPE OF WORK <br /> ' Based on the results of the previous UST removal soil sampling, an unauthorized release of <br /> petroleum hydrocarbon compounds has occurred at the site. AGE proposes to collect soil and.grab <br /> ground water samples to evaluate the lateral and vertical extent of petroleum hydrocarbon impacts. <br /> Advanced GeoEnvironmental,Inc. <br /> 1 <br />