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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) I inda -1 urkette of the PHS/EHD was on site to observe the fieldwork Soil and groundwater samples were collected during the investigation for laboratory analyses I he results of the laboratory analyses indicated that elevated concentrations of TPH-G, B TFX, 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, below) TABLE B 3 Laboratory Results (Sod/Geoprobe) B t E X MTBE 1 PI I-G l EPII Detection 50 50 50 — 50 50 1 (1 1 0-10 Sample I D Limits µg/kg µg/kg µg/kg µg/kg mg/kg µg/kg mg/kg 1432 GPI-9 NJ) NI) NI) NJ) ND ND M) 1432-GP2-11 M) NI) NI) NI) ND NI) 45(motor oil range?) 1432-OP-1-10 ND ND M) M) 14 NJ) 39(motor oil range,�) 1432-61`4 5 920 1 500 ND(100) Nl)(100) 14,000 28 55(motor oil rangL�) 1432 OP5 13 NI) N1) NJ) N]) NI) NJ) ND ( nitC'onrcrsrons Analytx,al µg/kg parts pc.r billion(ppb) 13 r>✓X bcn/A nc t[IhienL ethyl bcvzcnc and total xylcric.s mgJkp parts per million(ppm) WIIII m(-Ihyl tertiary butyl ether I I'll-fl total pctrolcum hydrocarbons quantified a5 pasolinc T]PI total extractable PCU)]cum hydrocarbons quantth d as du+cl motor oil and kerosene. XI) none detected at or above laboratory detcetion hmrts (100) detcetron limits raisad due to gasoline interference (motor oil range?) orgames detc,-ted within the motor oil range however do not match the motor oil pattern TABLE B 4 Chemical Analyses (Groundwater/Geoprobe) B T E X M ME TPH-G TFPII Detection 03 03 03 06 l 0 005 0 05-0 5 Sample I D Limits µg/I µg/1 µg/1 µg/I }tall µg/1 mall 1432-GPI-8/29/96 NJ) 03 M) ND ND ND NI) I1432-GP2-8/29196 04 06 ND 06 ND ND ND 1432-GP4-8/29196 69 600 66 400 1,300 27 ND 1432-(-,PS-8/29/96 NJ) N17 N1) M) I NI) M) ND Unit Conversio ns Analytx.al µg/1 parts per billion(ppb) BTEX benzenc,toluene ethyl benzene,and xylene rng/l parts per million(ppm) MTBP methyl tertiary butyl ether TPH-G total petroleum hydrocarbons quantified as gasoline ThPH total extractable petroleum hydrocarbons quantified as diesel motor oil,and kerosene ND none detected at or above the reported laboratory detection limits t� CONDOR 1