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0 • <br /> TABLE B.2 <br /> Laboratory Results (Groundwater/Hydropunch - August 1995) <br /> B T E X TPH-G TEPH <br /> Detection 0.3 0.3 0.3 0.6 0.05 0.05-0.5 <br /> Sample I.D. Limits: ug/1 pg/I ltg/I ug/l mg/I mg/I <br /> 1432-HPI-8/22/95 3.2 14 55 26 0.22 0.79 <br /> (diesel) <br /> 1432-HP2-8/22/95 0.4 1.3 ND 8.7 ND 0.57 <br /> (diesel) <br /> 1432-HP3-8/22/95(#) 260 ND 8.4 36 1.0 0.24 <br /> (diesel) <br /> Unit Conversions: Analytical <br /> FIJI:parts per billion(pp.) BTEX=benzene,toluene,ethyl benzene,and xylene. <br /> mg/I:parts per million(ppm) TPH-G=total petroleum hydrocarbons,quantified as gasoline. <br /> TEPH=total extractable petroleum hydrocarbons,quantified as <br /> diesel. motor oil,and kerosene. <br /> ND=none detected at or above the reported laboratory detection <br /> limits. <br /> • #=detection limit raised due to gasoline interference. <br /> Based on the results of the August, 1995, investigation, Condor recommended additional <br /> investigation be conducted to evaluate the extent of the hydrocarbon plume (reference Soil and <br /> Groundwater Investigation AeTort, prepared by Condor, dated September 26, 1995). Mr. Ronald <br /> Rowe of the PHS/EHD verbally approved the proposal for additional investigation during a <br /> telephone conversation with Condor in mid-February, 1996. <br /> On August 29, 1996, five Geoprobe boreholes(GP-I through GP-5) were installed at the site(see <br /> the figure attached to the back of Appendix B for borehole locations). Linda Turkette of the <br /> PHS/EHD was on site to observe the fieldwork. Soil and groundwater samples were collected <br /> during the investigation for laboratory analyses. The results of the laboratory analyses indicated <br /> that elevated concentrations of TPH-G, BTEX, and MTBE were detected at GP-4. The TEPH <br /> (motor oil range) concentrations detected in soil samples collected from GP-2, GP-3, and GP-4, <br /> are questionable and are likely to be associated with the natural organic content of the soil (i.e., <br /> peat), which is known to produce false positive results (see Tables B.3 and B.4 on the next page). <br />