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4 rl r <br /> . 1 . 0 INTRODUCTION <br /> This submittal presents Aqua Science Engineers, Inc (ASE)'s remedial <br /> action plan (RAP) to conduct further on-site remediation at Frank's One <br /> Stop located at 2072 West Yosemite Avenue in Manteca, California (Figure <br /> 1) Also included in this report is a workplan to conduct additional off- <br /> site groundwater assessment downgradient of the site This workplan is <br /> being prepared to respond to the directives of the San Joaquin County <br /> Public Health Services, Environmental Health Division (PHS-EHD) <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 and <br /> U-Haul truck rental <br /> 2. 1 February 1995 Site Ass,ssment. <br /> In February 1995, Geological Audit Services of Stockton, California drilled <br /> 13 soil borings (GB-1 through G13-10, 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), 2 5 ppm benzene, 4 4 ppm toluene, 2 4 <br /> ppm ethyl benzene and 8 3 ppm total xylenes were detected 1n 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 Alm] 1997„Stt_e, -_Assessment <br /> In April 1997, Remedy, Inc of Fremont, California, drilled ten soil borings <br /> (B-I through B-10) at the site (Figure 2) Soil samples were collected at <br /> 12-feet below ground surface (bgs) to each of the borings Up to 880 <br /> ppm TPH-G, 1 0 ppm TPH-D, 0 89 ppm benzene, 15 ppm toluene, 10 p p m <br /> ethyl benzene, 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 p p b <br /> toluene, 3,500 ppb ethyl benzene, 21,000 ppb total xylenes and 21 ,000 <br /> Frank's One Stop Remedial Action Plan — August 2001 <br /> -1- <br />