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<br /> 1 . 0 INTRODUCTION
<br /> This submittal presents Aqua Science Engineers, Inc (ASE)'s workplan f o r
<br /> further environmental activities at Frank's One Stop located at 2072 West
<br /> Yosemite Avenue in Manteca, California (Figure 1) This workplan
<br /> preparation was initiated by Mr Frank Guinta, owner of the property, to
<br /> meet the requirements of the San Joaquin County Public Health Services,
<br /> Environmental Health Division (PHS-EHD) as outlined in their letter dated
<br /> May 17, 2000 (Appendix A)
<br /> 2 . 0 BRIEF 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
<br /> 7 . 1 Febrjiary 1995 Site Assessment
<br /> In February 1995, Geological Audit Services of Stockton, California drilled
<br /> 13 soil borings (G13-1 through GB-10, ISLAND 1, IS and IW) 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), 25 ppm benzene, 44 ppm toluene, 2 4
<br /> ppm ethyl benzene and 83 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 ethyl
<br /> benzene 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 April 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 in
<br /> ethyl benzene, 63 ppm toluene and 92 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 p p b
<br /> toluene, 3,500 ppb ethyl benzene, 21,000 ppb total xylenes and 21 ,000
<br /> Frank's One Stop Workplan — June 2000
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