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Selection for laboratory analysis was based upon field evidence of contamination (PID readmgs, <br /> ,. discoloration, odors) and site stratigraphic changes. Two consecutive samples were collected <br /> ' to document the vertical extent of contamination within a boring. Analytical methods, sample <br /> containers, holding times, and means of preservation are listed in WaterWork's QA/QC Plan <br /> (Appendix IV) <br /> Subsequent to well installation, water samples were collected from the monitoring well after <br /> ' purging a minimum of four well volumes. A well volume is defined as the amount of <br /> groundwater in the well casing and sandpack in the annular space surrounding the casing <br /> Stabilization of EC, pH, and temperature were checked after purging and before and after <br /> sample collection to ensure samples collected were representative of formation water. Water <br /> sample collection and preservation was performed in accordance with WaterWork's QA/QC <br /> Groundwater Sampling Protocol (Appendix IV) The samples were analyzed for BTEX and <br /> ' TPHG by Applied Analytical Laboratory. <br /> IP4.0 RESULTS OF INVESTIGATION <br /> 4.1 Soils <br /> ' Subsurface soil samples collected on January 15 and 16, 1991, were submitted to Applied <br /> Analytical and analyzed for BTEX and TPHG. Laboratory results for Monitoring Well 1 (MW- <br /> 1) indicated non-detectable levels for BTEX and TPHG at 66 and 71 feet below grade <br /> Laboratory analyses for Angle Soil.Boring 1 (ASB-1) reported levels below one part per million <br /> ' (ppm) for BTEX at 51.5 longitudinal feet Laboratory results reported levels below one ppm <br /> for BTEX for the 26 0 foot interval in Angle Boring 2 (ASB-2) Benzene was non-detectable <br /> at the 3 1.0 foot interval in ASB-2. However, elevated levels of toluene, ethylbenzene, xylenes <br /> and TPHG were detected Soil Boring 3 (SB-3) indicated less than one ppm for the toluene, <br /> ' ethylbenzene, and xylenes and non-detection for benzene at 21.0 feet below grade. At 26 0 feet <br /> and 45.5 below grade, Soil Boring 3 contained less than one ppm xylenes and non-detectable <br /> ' levels of benzene, toluene, ethylbenzene and TPHG, with the exception of 1.2 ppm toluene at <br /> 45.5 feet. <br /> ' BU8R122 NK 5 <br />