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' 12 Ju 19 June 96 AGE-NC Project No 95-0112 Page 5 of 7 1 4.0. FINDINGS 41 STRATIGRAPHY Predominantly clayey to silty sand was encountered from surface grade to approximately 16 feet below surface grade(bsg)and from 23 feet bsg to 36 feet bsg Silt was encountered from 36 feet bsg to 42 feet bsg and from 49 feet bsg to the bottom of the bonngs (60 feet bsg) Sandy clay and silty sand were encountered from 42 feet bsg to 49 feet bsg A clay layer was present from 27 feet bsg to ' 30 feet bsg in boring B9 Boring logs are included in Appendix A 1 42 LABORATORY AND FIELD EVIDENCE OF EAPACTED SOIL Organic vapors were detected in samples collected at depths of 45 and 50 feet in both boring B9 and ' B 10 at concentrations up to 112 pasts per million volatiles (ppmv) No organic vapors were detected in any other samples from either boring (Boring Logs, Appendix A) Six soil samples were analyzed for TPH-g and BTE&X TPH-g was detected in samples 139-45 and BIO-45 at concentrations of 12 pg/g (parts per million ppm) and 1,300 ppm, respectively Ethylbenzene and xylenes were detected in sample BIO-45 at concentrations of 0 32 ppm and 7 5 ppm, respectively No other petroleum hydrocarbons were detected in any of the soil samples analyzed Total lead was detected in sample BIO-40 at a concentration of 5 9 ppm Total lead was not detected in sample B9-40 Analytical results are summarized on Table 1 The laboratory reports (AAL Batch No 96-0315-014, 96-0517-020) and chain-of-custody forms are included in Appendix B 4TI 3 GROUND WATER ELEVATION AND FLOW DIRECTION The relative ground water elevation data is given in Table 2 Between February and April 1996, ground water elevation rose an average of 1 I feet Ground water mounding was observed during the April monitoring A lesser increase of ground water elevation was observed in MW-1, MW-3 and MW-4 during the April 1996 monitoring, corresponding to the greater increase observed in these wells during the previous quarter Relative ground water elevations for April 1996 are depicted in Figure 3 1 4 4 LABORATORY ANALYSIS OF GROUND WATER SAMPLES TPH-g was detected in the ground water sample collected from MW-I at a concentration of 670 parts per billion(ppb, reported as micrograms per liter) BTE&X were detected in the sample from