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.w. <br /> 30 April 1997 <br /> AGI?-NC Project No. 96-0209 <br /> Page 4 of 5 <br /> 3.4. LABORATORY ANALYSIS <br /> Selected soil and grab ground water samples were analyzed for total petroleum hydrocarbons <br /> quantified as gasoline ("FPH-(Y) and volatile aromatics (benzene, toluene, ethyl benzene and xylenes: <br /> BTI;&X). Soil samples ,sere analyzed in accordance with EPA methods 5030/8015m and 8020; <br /> ground water samples were analyzed in accordance with methods 503018015m and 602. <br /> 4.0. FINDINGS OF SOIL PROBE BORING INVES'T'IGATION <br /> 4.1. STRATIGRAPHY <br /> ']',in and gray, silty clay was encountered from surface grade to approximately 20 feet bsg. In probe <br /> borings advanced to 25 feet bsg, the soil tyle consists of tan aa�d ;ray, silty sand. Saturated <br /> conditions were encountered in the deeper soil unit. <br /> 4.2. LABORATORY RESULTS OF SOIL BORING SAMPLES <br /> TPH-g was detected in five of mvlve samples submitted for analysis at concentrations ranging from <br /> 2.0 to 810 ppm. Benzene %vas detected in two samples analyzed; toluene: was detected in three <br /> samples analyzed; while ethylbenzerne and xylcnes �yere detected in four samples analyzed. MTB1-' <br /> %vas detected in one sample, P6-20, at a concentration of 5.5 ppm. <br /> -- Analytical results of probe boring samples are summarized for review on Table 1 -Anul-vlicul Results <br /> of Soil Su»rples. The laboratory report (MAI Laboratory ID 7123)6 through 71248), QzVQC report <br /> and chain-of-custody ars; enclosed as Appendix B. <br /> 4.3, LABORATORY RESULTS OF GRAB GROUND WATER SAMPLES <br /> Grab ground water samples «^cre collected from probe borings PI and P2. No petroleum <br /> _ hydrocarbons were detected in either grab ground water sample. Analytical results of ground �\tater <br /> samples are summarized on Table 2 -A)ialytical Results of Ground lf,ater 5anrples. `The laboratory <br /> report (MAI Laboratory ID 71234 through 71235). Q AJQC report and chain-of-custody are <br /> presented in Appendix B. 4 <br />