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1 . 0 INTRODUCTION
<br /> This report presents the methods and findings of Aqua Science Engineers,
<br /> Inc (ASE)'s soil and groundwater assessment for Frank's One Stop located
<br /> at 2072 West Yosemite Avenue in Manteca, California (Figure 1) This
<br /> assessment was initiated by Mr Frank Guinta, owner of the property, as
<br /> required by the San Joaquin County Public Health Services, Environmental
<br /> Health Division (PHS-EHD)
<br /> 2 . 0 SITE HISTORY AND BACKGROUND INFORMATION
<br /> The site is currently a gasoline and diesel service station with additional
<br /> on-site businesses such as automotive repair, bait shop, mini market, U
<br /> Haul truck rental and propane sales located on the property
<br /> 2- 1 February 1995 Site Assessment
<br /> In February 1995, Geological Audit Services of Stockton, California drilled
<br /> 13 soil borings (GB-1 through GB-10, ISLAND 1, IS and AW) at the site
<br /> (Figure 2) Up to 1,400 parts per million (ppm) total petroleum
<br /> hydrocarbons as gasoline (TPH-G), 18,000 ppm total petroleum
<br /> hydrocarbons as diesel (TPH-D), 2 5 ppm benzene, 4 4 ppm toluene, 2 4
<br /> ppm ethylbenzene and 8 3 ppm total xylenes were detected in soil
<br /> samples collected from the site Up to 13,000 parts per billion (ppb)
<br /> TPH-G, 2,500 ppb TPH-D, 83 ppb benzene, 840 ppb toluene, 230 ppb
<br /> ethylbenzene and 1,900 ppb total xylenes were detected in groundwater
<br /> samples collected from the borings The highest concentrations were
<br /> detected in samples collected northwest or adjacent to the underground
<br /> storage tanks (USTs), and in samples collected adjacent to the diesel fuel
<br /> dispenser
<br /> 2-2 A}L, 1997 Site Assessment
<br /> In April 1997, Remedy, Inc of Fremont, California, drilled ten soil borings
<br /> (B-1 through B-10) at the site (Figure 2) Soil samples were collected at
<br /> 12-feet below ground surface (bgs) in each of the borings Up to 8 8 0
<br /> ppm TPH-G, 1 0 ppm TPH-D, 0 89 ppm benzene, 15 ppm toluene, 10 p p m
<br /> ethylbenzene, 63 ppm toluene and 9 2 ppm methyl tertiary butyl ether
<br /> (MTBE) were detected in the soil samples collected from these borings
<br /> Groundwater samples collected from these borings contained up to
<br /> 130,000 ppb TPH-G, 760 ppb TPH-D, 5,300 ppb benzene, 28,000 ppb
<br /> toluene, 3,500 ppb ethylbenzene, 21,000 ppb total xylenes and 21 ,000
<br /> ppb MTBE The highest hydrocarbon concentrations were detected in soil
<br /> Franks One Stop Report - June 1999
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