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' TABLE B 2 . Laboratory Results (Groundwater/Hydropunch - August 1995) i ' B F E X TPH-G TEPH Detection 03 03 03 06 005 0 05-0 5 ' Sample 1 D Limits µg1[ µgtl µg/l µg/I mg/1 mg/l. 1432-HPI-8/22/95 3 2 14 5 5 26 022 079 (diesd) ' 1432-11P2 8/22/95 0 4 1 3 'N 1) 8 7 NLS 057 (diesel) 1432-}{P3-$/22/95 (ki) 260 ND 84 36 1 0 024 ' (diesel) I nit(onversiom Analytical ' µg11 parts per billion(pp J 8 rEX ben7Lne toluene ethyl benLene and xylene Mg/1 parrs per million(ppm) TPH-G-total petmleum hydrocarbons quantified as gasoline TEPH -total extractable,petroleum hydrocarbons quantified as diesel motor oil and kerosene ' ND-none detected at or above the reported laboratory detection limits 4 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 Sod 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 lie On August 29, 1996, five (,eoprobe boreholes -1 through GP-5) were installed at the site (see the figure attached to the back of Appendix B for borehole locations) Lmda I urkette of the PHS/1-HD 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 (t e , peat), which is known to produce false positive results (see Tables B 3 and B 4 on the next page) 1 1 1 • 1 1