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<br /> Tosca Corporation,a subsidiary of Phillips Petroleum Company 3
<br /> Tosco Station#11193,3202 West Hammer Lane Stockton CA March 7,2002
<br /> . ppm (133) Additionally, approximately 15,000 gallons of water was removed from the
<br /> UST excavation during the installation of the new USTs Laboratory analysis of a grab
<br /> groundwater sample detected maximum concentrations of TPHg, benzene, and MtBE at
<br /> 17,000 pg/L, 1,500 gg/L, and 120,000 gg/L, respectively Groundwater Monitoring Well
<br /> MW-1 was destroyed to allow the enlargement of the existing UST excavation to allow
<br /> 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 CB-1, CB-2, and CB-4 through CB-6 Water samples were collected at depths of
<br /> 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 315 and
<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 315 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-1),
<br /> benzene at 84 µg/L (VW-1), MtBE at 250,000 pg/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 pg/L and 68,000 gg/L, respectively, benzene at 14 3 gg/I, and 220gg/L
<br /> respectively, and MtBE at 12,400 gg/L and 68,700 gg/L respectively(Blaine, 2001)
<br /> DPE OPERATION
<br /> Pre-Test Activities
<br /> Prior to initiation of field activities, SECOR obtained authorization to perform the DPE
<br /> test from San Joaquin Valley Unified Air Pollution Control District SECOR also
<br /> prepared a site-specific Health and Safety Plan (HASP) The HASP is required by the
<br /> Occupational Health and Safety Administration (OSHA) "Hazardous Waste Operations
<br /> and Emergency Response" guidelines (29 CFR 1910 120), and by California
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