ARCHIVED REPORTS XR0001535 - Laserfiche WebLink

Home Browse Search

10 September 2004 AGE-NC Project No 03-1100 Page 3 of 10 samples were collected at 65, 70, and 74 feet bsg TPH-g and/or BTEX compounds were detected in all three soil samples analyzed A discrete ground water sample was collected at 60 feet bsg utilizing a SimulProbe sampling system,significant concentrations of TPH-g and BTEX compounds were detected in the analyzed ground water sample On 26 to 28 September 2001 monitoring wells MW4 through MW7 were Installed off-site MW4 and MW5 were Installed south of the subject site within the property boundary of the San Joaquin County Fairgrounds MW 6 was installed west of the subject property on the northwestern corner of Sierra Nevada Street and East Charter Way MW7 was installed north of the subject property on the eastern side of Sierra Nevada Street The wells are screened from 30 to 50 feet bsg All soil and ground water samples analyzed from the September 2001 investigation were below detectable limits for the constituents of concern On 20 and 21 February 2002, CPT1A and CPT2 were advanced at the subject property and surrounding area to determine the hydrocarbon impact to ground water Grab ground water samples were collected at 60 and 105 feet bsg in borings CPT1A and CPT2, an additional sample was collected at 130 feet bsg in boring CPT2 Petroleum hydrocarbons were detected in ground water samples collected at 60 and 105 feet bsg at maximum concentrations of 59,000µg11 TPH-g,210µg11 benzene, 1,000 gg/l toluene,840 gg/1 ethylbenzene and 5,300 ug/l total xylenes from boring CPT1 A at 60 feet bsg On 23 through 25 September 2003, CPT3 through CPT5 were advanced in areas surrounding the subject property to determine the lateral and vertical extent of the petroleum hydrocarbon impact The bonngs were advanced to a total depth of 124 feet bsg Discrete ground water samples were collected at approximately 55-60, 72-75 and 115-120 feet bsg TPH-g was detected in groundwater samples CPT3@73-77', CPT3@115-119' and CPT4@71-75' at concentrations of 90 ptg/l, 130 µg11 and 100 µg/l, respectively Analytical results of all previous investigations are summarized in Tables 1 and 2 3.0. PROCEDURES Five soil vapor extraction wells (SVEI through SVE5) and three ozone sparge wells (OZ1 through OZ3)were Installed in December 2003 In January 2004, two soil vapor extraction pilot tests were conducted to evaluate SVE as a remedial alternative The SVE unit and associated piping were installed in August 2004 Field work was performed in accordance with guidelines issued by the Central Valley Regional Water Quality Control Board (CVRWQCB) for the investigation of underground storage tanks (UST) sites Advanced GeoEnvironmental,Inc