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<br /> Tosco Corporation a subsidiary of Phillips Petroleum Company 2
<br /> Tosco Station#11193 3202 West Hammer Lane,Stockton,CA March 7,2002
<br /> analytical results for soil detected maximum concentrations of benzene at 0 1200 ppm (S-
<br /> 213-132),
<br /> S-213-B2), toluene at 0 0200 ppm (5-20 0-B1), ethylbenzene at 0 0180 ppm (S-21 3-B2),
<br /> and total xylenes at 0 0240 ppm (5-21 3-B2) Gasoline range total petroleum
<br /> hydrocarbons (TPHg) and diesel range total petroleum hydrocarbons (TPHd) were not
<br /> detected above laboratory detection limits Laboratory analytical results for groundwater
<br /> detected maximum concentrations of TPHg at 2,200 parts per billion (ppb) (MW-1),
<br /> benzene at 120 ppb (MW-2), toluene at 15 ppb (MW-1), ethylbenzene at 10 ppb (MW-
<br /> 2), and total xylenes at 24 ppb (MW-2) TPHd was not detected above laboratory
<br /> detection limits (RESNA, 1993)
<br /> In March of 1994, Alisto conducted a supplemental subsurface investigation by drilling
<br /> and installing three groundwater monitoring wells (MW-5 through MW-7) to total depths
<br /> of 31 to 32 feet bgs Groundwater Monitoring Well MW-5 was installed on the northeast
<br /> corner of the property, Well MW-6 was installed in an alley west of Kelly Drive, and
<br /> MW-7 was installed on the north side of West Hammer Lane Laboratory analysis of soil
<br /> samples detected maximum concentrations of benzene at 0 13 ppm (MW-5-16'), toluene
<br /> at 0 67 ppm (MW-6-16'), and total xylenes at 0 015 ppm (MW-5-16') TPHg and TPHd
<br /> were not detected above laboratory detection limits (EMCON, 1994)
<br /> On November 22, 1994, EMCON conducted a supplemental site assessment consisting of
<br /> collecting two grab soil samples (TD-2 and TD-3) below the eastern fuel dispensers at the
<br /> north and south dispensers, drilling of two soil borings (THP-1, THP-2) to total depths of
<br /> 26 5 feet bgs, and the dnlling and installation of Vapor Extraction Well VW-1 to a total
<br /> depth of 17 feet bgs Soil and hydropunch groundwater samples were collected and
<br /> analyzed from borings THP-1 and THP-2 Laboratory analysis of soil samples TD-2 and
<br /> TD-3 detected maximum concentrations of TPHg at 2,100 ppm (TD-2), toluene at 3 5
<br /> ppm (TD-3), ethylbenzene at 18 ppm(TD-3), and total xylenes at 110 ppm (TD-3)
<br /> TPHd, oil range total petroleum hydrocarbons (TPH-O), and benzene were not detected
<br /> above laboratory detection limits Laboratory analysis of soil samples from borings
<br /> THP-1 and THP-2 detected maximum concentrations of TPHd at 1 ppm (THP1S-10) and
<br /> benzene at 0 03 ppm (THP@S-15) TPHg, TPH-O, toluene, ethylbenzene, and total
<br /> xylenes were not detected above laboratory detection limits Laboratory analysis of
<br /> groundwater samples from borings THP-1 and THP-2 detected maximum concentrations
<br /> of TPHg at 6,900 ppb (THP2W-21), TPHd at 840 ppb (THP2W-21), benzene at 1,900
<br /> ppb (THP2W-21), and total xylenes at 77 ppb(THP2W-21) TPH-O, benzene toluene,
<br /> ethylbenzene, and Halogenated Volatile Organic Compounds (HVOC's) were not
<br /> detected above laboratory detection limits (EMCON, 1994)
<br /> On December 10 through 22, 1998, Gettler-Ryan Incorporated (GR) supervised the
<br /> removal of two 10,000 gallon and one 8,000 gallon single-walled UST, dispensers, and
<br /> associated product dispenser piping Laboratory analysis of soil samples collected from
<br /> the UST excavation detected maximum concentrations of TPHg at 31 ppm (3W),
<br /> benzene at 0 27 ppm (3W), and Methyl-tert Butyl Ether(MtBE) at 80 ppm (3E)
<br /> iLaboratory analysis of soil samples collected from the beneath the dispensers and product
<br /> piping detected maximum concentrations of TPHg at 1,600 ppm (Dl) and MtBE at 1 8
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