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Tosco Marketing Company 3
<br /> Tosco Wormer BP)#11193 3202 West Hammer Lane Stockton,CA October 29 2001
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<br /> of a grab groundwater sample detected maximum concentrations of TPHg, benzene, and
<br /> MtBE at 17,000 gg/L, 1,500 gg/L, and 120,000 ltg/L, respectively. Groundwater
<br /> Monitoring Well MW-1 was destroyed to allow the enlargement of the existing UST
<br /> excavation to allow for the installation of the new USTs (GR, 1999).
<br /> On October 7 and 8, 1999, Cambria Environmental Technology, Incorporated (Cambria)
<br /> conducted Cone Penetration Testing (CPT)by advancing six borings (CB-1 through CB-
<br /> 6) for soil and groundwater sampling and two borings (CB-2E and CB-4E) for electric
<br /> soil logging. Soil samples were collected every five feet to approximately 20 feet bgs.
<br /> Water samples were collected using a hydropunch at depths of 16 and 29 feet bgs in
<br /> borings C13-1, CB-2, and CB-4 through CB-6. Water samples were collected at depths
<br /> of 16 and 29 feet bgs in boring CB-3. Laboratory analysis of soil samples collected from
<br /> the soil borings detected maximum concentrations of gasoline range organics (GRO) at
<br /> 27 milligrams per kilogram (mg/kg) (CB-3-13.5),MtBE at 27 mg/kg (CB-3-13.5), and
<br /> Tert amyl methyl ether (TAME) at 0.058 mg/kg (CB-3-13.5). BTEX was not detected
<br /> above laboratory detection limits. Laboratory analysis of groundwater samples collected
<br /> from the soil borings detected maximum concentrations of gasoline range organics
<br /> (GRO) at 87,000 gg/L (CB-4-16HP),benzene at 1,300 gg/L(CB-4-16HP), MtBE at
<br /> 38,000 gg/L(CB-1-16HP), and TAME at 160 gg/L (CB-1-16HP) (Cambria, 1999).
<br /> On June 12 and 13, 2000, Cambria replaced destroyed Well MW-1 and damaged Well
<br /> MW-2 with Groundwater Monitoring Wells MW-1R and MW-2R to depths of 31.5 and f
<br /> 30 feet bgs, respectively. In addition, Cambria drilled and installed two 2-inch diameter
<br /> wells (MW-9 and MW-10) to a total depth of 31.5 feet bgs. Laboratory analysis of soil
<br /> samples collected from the soil borings detected maximum concentrations of TPHg at
<br /> 0.82 mg/kg (MW8-12') and MtBE at 2.6 mg/kg(MW8-30). BTEX was not detected
<br /> above laboratory detection limits. Laboratory analysis of groundwater samples collected
<br /> from all wells detected maximum concentrations of TPHg at 3,400 gg/L(VW-I),
<br /> benzene at 84 gg/L(VW-1), MtBE at 250,000 gg/L, and Tert-butyl Alcohol (TBA) at
<br /> 17,000 84 gg/L (MW-2R) (Cambria, 2000).
<br /> Based on the Quarterly sampling performed by Blaine Technical Services (Blaine), MW-
<br /> 2R and VW-1 have the most impacted groundwater with concentrations of TPHg at
<br /> 11,000 gg/L and 68,000 gg/L, respectively, benzene at 14.3 gg/L and 220gg/L
<br /> respectively, and MtBE at 12,400 gg/L and 68,700 gg/L respectively (Blaine, 2001).
<br /> PROPOSED SCOPE OF WORK
<br /> Task 1 —Pre-Event Activities
<br /> Prior to conducting the DPE event, SECOR will submit a letter of notification and a
<br /> Z copy of this work plan to the San Joaquin Valley Unified Air Pollution Control District
<br /> (SJVUAPCD). SECOR will also prepare a site-specific Health and Safety Plan (HASP).
<br /> The HASP is required by the Occupational Health and Safety Administration (OSHA)
<br /> 1 "Hazardous Waste Operations and Emergency,Response" guidelines (29 CFR 1910.120),
<br /> and by California Occupational Health and Safety Administration (Cal-OSHA)
<br /> "Hazardous Waste Operations and Emergency Response" guidelines (CCR Title 8,
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<br /> TOSCO 11193/pilottest-dualphase
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