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' TABLE B.2 Laboratory Results (Groundwater/Hydropunch-August 1995) B T E X TPH-G TEPH Detection 0.3 0.3 0.3 0.6 0.05 0.05-0.5 Sample I.D. Limits: µ9/1 pg/I µg/1 pg/1 mg/l mg/1 1432-HPI-8/22/95 3.2 14 5.5 26 0.22 0.79 ' (diesel) 1432-HP2-8/22/95 0.4 1.3 ND 8.7 ND 0.57 (diesel) 1432-HP3-8/22/95(#) 260 ND 8.4 36 1.0 0.24 ' (diesel) Unit Conversions: Analytical pg/[:parts per billion(ppb) 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. ND=none detected at or above the reported laboratory detection limits. N=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 (GP-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 13.4, below). ' TABLE B.3 Laboratory Results(SoiVGeoprobe) B T E X MTBE TPH-G TEPH Detection 5.0 5.0 5.0 5.0 5.0 1.0 1.0-10 Sample I.D. Limits: pg/kg pg/kg pg/kg pg/kg mg/kg pg/kg mg/kg 1432-GPI-9 ND ND ND ND ND ND ND ' 1432-GP2-11 ND ND ND ND ND ND 45(motor oil range?) 1432-GP-3-10 ND ND ND ND 14 ND 39(motor oil range?) 1432-GP4-5 920 1,500 ND(100) ND(100) 14,000 28 55(motor oil range?) 1432-GP5-13 ND ND ND ND ND ND ND ' Unit Conversions: Analytical pg/kg:parts per billion(ppb) BTEX=benzene,toluene,ethyl benzene,and total xylenes. mg/kg:parts per million(ppm) MTBE=methyl tertiary butyl ether TPH-G=total petroleum hydrocarbons,quantified as gasoline. ' TEPH=total extractable petroleum hydrocarbons,quantified as diesel,motor oil,and kerosene. ND=none detected at or above laboratory detection limits. (100)=detection limits raised due to gasoline interference. (motor oil range?)=organics detected within the motor oil range,however do not match the motor oil pattern. i B-2