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i <br /> Additional Soil and Groundwater Investigation Report <br /> Canepa's Car Wash(Pacific Avenue) <br /> January 21,2002 <br /> Page 8 <br /> well MW-12d was installed to monitor groundwater at 100 to 110 feet bgs based on the results of the <br /> groundwater sample collected at that interval in hydropunch boring HP-2 (described below). <br /> The laboratory analytical results of the groundwater samples collected from the hydropunch borings and <br /> new monitor wells are shown in Table 4, below. The results of the groundwater samples collected from <br /> the monitor wells are described under separate cover(Fourth Quarter Groundwater Monitoring Report, <br /> dated January 14, 2002, prepared by Condor). The results of the groundwater samples collected from the <br /> hydropunch borings indicate that none of the analytes requested were detected at or above the laboratory <br /> reported detection limits in any of the samples with the exception of the sample collected from 11P-2 <br /> (100 to 110 feet bgs). BTEX constituents were detected in the HP-2 sample at concentrations ranging <br /> from 1.6 to 5.5 pg/L and TPH-G was detected at a concentration of 53 µg/L. <br /> TABLE 4 <br /> IGroundwater Sample Laboratory Analytical Results (September, October,2001) <br /> Groundwater Samples B T E X MTBE TPH-G <br />' Reporting limits: 0.3 0.3 0.3 0.6 0.5 50 <br /> Monitor Well/Sample n/L gg/L gg/L 14g/L 1tgAL gg/L <br /> I.D. <br />' 1707-HPI-120-125 ND NO NO ND ND* NO <br /> 1707-HP2-101-110 2.8 2.7 1.6 5.5 ND* 53 <br />' 1707-HP3-91-95 ND ND ND ND ND* ND <br /> 1707-HP4-116-120 ND NO NO NO ND* NO <br /> I1707-HP5-91.5-95 NO ND NO NO ND* ND <br /> 1707-HP6-79-83 ND NO NO NO Nil* ND <br /> I1707-HP7-117-120 NO NO NO NO ND* ND <br /> 1707-HP8-97-100 NO NO NO NO ND* ND <br /> I1707-HP9-77-80 ND NO ND NO ND's ND <br /> 1707-MW9-10125101 NO NO NO NO ND NO <br /> I1707-MW10-10125101 NO ND ND NO ND NO <br /> 1707-MW11-10/25/01 390 64 61 140 85 2.4 <br /> 1707-MW 12d-10/25/0I 17€1 240 72 430 NO 2.4 <br /> Unit Conversions: Analytical <br /> µg/L:parts per billion(ppb) B,T,E,X=benzene,toluene,ethyl benzene,and total xylenes. <br /> mg/L:parts per million(ppm) "1'PH-G=total petroleum hydrocarbons,quantified as gasoline. <br /> NA:Not analyzed MT13E=Methyl tertiary-Butyl Ether. <br /> ND:Not detected above the laboratory reporting limit <br /> *All gasoline oxygenates other than MTBE were not detected at or above the laboratory reported detection limits. <br /> i CONDOR <br />