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Additional Soil and Groundwater Investigation Report Canepa's Car Wash(Park Street) ' May 8 2002 Page 4 Hydropunch sample HP3 was collected at 119 to 123 feet bgs to correspond with the horizon near the bottom of the CPT1 boring Hydropunch sample HP5 was collected at 90 to 94 feet bgs (approximately midway between HP4 and HP6) to correspond with relatively permeable material at that depth in CPT2 ' Hydropunch samples HP7, HP8, and HP9 were collected at approximately 27 to 31 feet bgs (at the water table) along the eastern edge of San Joaquin Street north and south of Park Street Hydropunch samples HP10 through HP13 were collected at approximately 27 to 31 feet bgs (at the water table) along the northern edge of Park Street, north of the site Hydropunch samples HP 19, HP20, and HP21 were collected at approximately 46 to 50 feet bgs along the northern edge of Park Street Hydropunch samples HP14 through HP18 were collected at approximately 30 to 34 feet bgs (at the water table) along the ' southern portion of the site Sample locations are shown in Figure 2, in Appendix A 4 2 SOIL SAMPLING RESULTS ' Soil boring SB-1 was installed to evaluate the vertical extent of petroleum hydrocarbon contamination in soil in the vicinity of the former UST location Four soil samples from the boring were submitted for laboratory analysis The soil sample laboratory analytical results are shown in Table 1, below, and in ' Figure 2, Appendix A Analytical results indicate that BTEX constituents and TPH-G were detected in all of the soil samples MTBE was not detected at or above the laboratory reporting limit in any of the soil samples The lowest BTEX and TPH-G constituent concentrations were detected in the soil sample collected at 82 feet bgs, the deepest sample collected TABLE 1 lie Soil Sample Laboratory Analytical Results (March 25,2002) Soil Samples B T E X MTBE TPH-G ' Reporting limits 0 005 0 005 0 005 0 005 0 005 1 0 Sample I D mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg 2038-SBI-66'-3/25/02 14 180 44 210 <2 5 3,700 2038-SBI-69'-3/25/02 1 6 16 5 3 26 <0 5 360 2038-SBI-76'-3/25102 19 250 75 270 <2 5 4,900 ' [2038-S131-82'-3/25/02 046 11 3 9 20 <0 25 340 Unit Conversions Analytical mg/kg parts per million(ppm) B T 11,X=benzene,toluene,ethyl benzene,and total xylenes TPH-G=total petroleum hydrocarbons,quantified as gasoline MTBE=Methyl tertiary-Butyl Ether ' 4 3 GROUNDWATER SAMPLING RESULTS The laboratory analytical results of the groundwater samples collected from the hydropunch borings are ' shown in Table 2, on the next page, and in Figure 2, Appendix A Shallow groundwater benzene, intermediate groundwater benzene, and shallow groundwater MTBE iso-concentration contour maps are included as Figures 3, 4 and 5, respectively, Appendix A Laboratory Certificates of Analysis and Chain- of-Custody Records are included in Appendix C ' `� CONDOR