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Additional Soil and Groundwater investigation Report Canepa's Car Wash(Pacific Avenue) January 21,2002 Page 7 TABLE 3 Soil Sample Laboratory Analytical Results (October 15-18,2001) Soil Samples B T E X MTBE TPH-G Lead Reporting limits: 0.005 0.005 0.005 0.005 0.005 1.0 0.30 Sample I.D. mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg 1707-MW10-40' ND ND ND ND ND ND NA 1707-MW9-35' ND ND ND ND ND ND NA 1707-SB3-25' ND ND ND ND ND ND NA 1707-SB3-30' ND ND ND ND ND ND NA 1707-SB3-35' ND ND ND ND ND ND NA 1707-SB4-20' ND ND ND ND ND ND NA 1707-SB4-30' ND ND ND ND ND ND NA 1707-SB4-40 ND ND ND ND 0,28 ND NA 1707-MW11-25' ND ND ND ND ND ND NA 1707-MW11-35' ND ND ND ND 0.005 ND NA I. 1707-MW 11-40' ND ND ND ND 0.009 ND NA Lead Composite NA NA NA NA NA NA. 3.7 Unit Conversions: Analytical mg/kg:parts per million(ppm) S,T,E,X=benzene,toluene,ethyl benzene,and total xylenes. NA:Not analyzed TPH-G=total petroleum hydrocarbons,quantified as gasoline. I NS:Not sampled MTBE=Methyl tertiary-Butyl Ether. ND:Not detected above the laboratory reporting limit 4.3 GROUNDWATER SAMPLING RESULTS Hydropunch borings HP-1 through HP-3 were installed to evaluate the vertical extent of groundwater contamination near the presumed center of the site contaminant plume. Groundwater samples were collected at three discrete depth intervals (120 to 125 feet bgs, 101 to 110 feet bgs, and 91 to 95 feet bgs in HP-1, HP-2, and HP-3, respectively) that corresponded with relatively permeable horizons identified in boring CPT-1. Hydropunch borings HP-4 through HP-6 were installed to evaluate the vertical extent of groundwater contamination near the potential northwest extent of the site contaminant plume_ Groundwater samples were collected at three discrete depth intervals(116 to 120 feet bgs, 91.5 to 95 feet bgs, and 79 to 83 feet bgs in HP-4, HP-5, and HP-6, respectively) that corresponded with reiatively permeable horizons identified in boring CPT-2. Hydropunch borings HP-7 through HP-9 were installed to evaluate the vertical extent of groundwater contamination near the potential northeast extent of the site contaminant plume. Groundwater samples were collected at three discrete depth intervals (117 to 120 feet bgs, 97 to 100 feet bgs, and 77 to 80 feet bgs in HP-7, HP-8, and HP-9, respectively) that corresponded with relatively permeable horizons identified in boring CPT-3. Monitor wells MW-9, MW- 10, and MW-I I were installed to investigate shallow groundwater quality (in the vicinity of the water table). The installation of these new shallow monitor wells was necessary because existing site monitor wells MW-1 through MW-8 are screened significantly below the current site water table. Deep monitor CONDOR