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i TABLE B 2 Laboratory Results (Groundwater/Hydropunch- August 1995) ' B T E X TPH-G TEPH Detection 0.3 03 03 06 005 0 05-0 5 ' Sample I D Limits. µg11 4/1 µg/1 µg11 mg/1 mg/1 1432-HPI-8/22195 32 14 55 26 02.2 079 (diesel) ' 1432-HP2-8/22/95 04 1 3 ND 8 7 ND 057 (diesel) ' 1432-HP3-8/22195 (0) 260 NT] 84 36 1 0 024 (diesel) Unit Conversions Analytical µg/1 parts per billion(pp) BTEX=benzene,toluene,ethyl benzene,and Xylene mgll parts per million(ppm) TPH-G—total petroleum hydrocarbons,quantified as gasoline TEPH=total extractable petroleum hydrocarbons,quantified as diesel motor oil and kerosene f ISD=none detected at or above the reported laboratory detection limits #—detection limit raised due,to gasoline interference Based on the results of the August, 1995, investigation, Condor recommended additional investigation be conducted to evaluate the extent of the hydrocarbon plume (reference Soil and Groundwater Investigation Report, prepared by Condor, dated September 26, 1995) Mr Ronald Rowe of the PHS/EHD verbally approved the proposal for additional investigation during a telephone conversation with Condor in mid-February, 1996 On August 29, 1996, five Geoprobe boreholes (CSP-1 through GP-5) were installed at the site (see the figure attached to the back of Appendix B for borehole locations) Linda Turkette of the PHS/EHD was on site to ' observe the fieldwork Soil and groundwater samples were collected during the investigation for laboratory analyses The results of the laboratory analyses indicated that elevated concentrations of TPH-G, BTEX, and MTBE were detected at GP-4 The TEPH (motor oil range) concentrations detected in soil samples collected from GP-2, GP-3, and GP-4, are questionable and are likely to be associated with the natural organic content of the soil (i e,peat), which is known to produce false positive results (see Tables B 3 and B 4 on the next page) r