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TABLE B.2 Laboratory Results (Groundwater/Hydropunch - August 1995) B T E X TPH-G TEPH Detection 03 03 03 06 005 0 05-0 5 Sample I D Limits 11 91 1 µg/1 µg/1 µg/1 mg/1 mg/i 1 332-HP1-$122195 3 2 14 5 5 26 022 079 (diesel) 143241P2-8/22/95 04 l 3 ND 8 7 ND 057 (diesel) 1432-HP3-8122/95 (4) 260 ND 84 36 1 0 024 (diesel) IJriit(onversions Analytical µg/I parts per billion(pp ) BTEX=benzene toluene ethyl benzene and xylene mg/l parts per million(ppm) FPH-G—total petroleum hydrocarbons,quantified as gasoline TFPH total extractable petroleum hydrocarbons quantified as dies,-] motor oil,and kerosene ND none detected at or above.the rcporti.d 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 Inve,;Ugation Report, prepared by Condor, dated September 26, 1995) Mr Ronald Rowe of the PIIS/EIID verbally approved the proposal for additional Investigation during a telephone conversation with Condor in mid4ebruary, 1996 On August 29, 1996, five (leoprobe boreholes (C3P-1 through GP-5) were installed at the site (see the figure attached to the back of Appendix B for borehole locations) I inda furkette of the. PHS/I Ili] was on site to I 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 1'PH-G, BTEX, and MTBI; were detected at GP-4 The TEPII (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)