Laserfiche WebLink
--------- <br /> Working To Restore Nature <br /> _ ., Groundwater beneath the site stabilized in August at approximately 11.3 to 15.3 feet below <br /> ground surface. Groundwater flows to the northwest under a gradient of 0.011 ft/ft, or v' <br /> approximately 58 feet per mile. The groundwater flow regime is illustrated on Figure 7. " <br /> Historical groundwater elevations are summarized in Table 4. <br /> 5.1 Assessment of Soil Contamination <br /> =' No BTEX constituents were detected from any boring drilled in the August 1993 investigation, ✓ <br /> with the exception of low levels of xylenes in the samples collected from SB-8 at a depth of 15 <br /> feet (0.1$ ppm) and SB-10 at a depth of 14 feet (0.24 ppm). <br /> TPHd was reported at levels ranging from non-detected (less than 1.0 ppm) to 720 ppm in soil V <br /> samples collected across the site. TPHd was reported in boring SB-3 at depths of 10.5 feet (2.2 <br /> ppm) and 15.5 feet (720 ppm); boring SB-4 at 10.5 feet (19 ppm) and 15 feet (93 ppm); boring <br /> SB-5 at 15.5 feet (270 ppm); boring SB-6 at 10.5 feet (7.2 ppm) and 15 feet (1.3 ppm); boring <br /> =3' SB-8 at 10.5 feet (49 ppm) and 15 feet (230 ppm); boring SB-9 at 15 feet (630 ppm); boring SB- <br /> 10 at 14 feet (340 ppm); and well MW-6 at 14 feet (7.9 ppm). No TPHd was detected in <br /> borings SB-7 or MW-5. Results of laboratory analyses of soil samples are summarized in Table <br /> r 1. Laboratory data sheets and chain of custody documentation are included in Appendix VT. <br /> - Soil samples collected from depths greater than 11 feet below grade are within the saturated <br /> - zone. Analytical results of those samples are more indicative of groundwater contamination <br /> =: rather than soil contamination. Results of soil samples collected in the vadose zone (less than <br /> 11 feet deep) suggest that shallow soil contamination is somewhat random and not laterally <br /> continuous across the site. Furthermore, no BTEX constituents are present at significant levels. <br /> 5.2 Assessment of Groundwater Contamination <br /> On August 3 and 4, 1993, groundwater samples were collected from borings SB-3, SB-7, SB-8 <br /> and SB-9 using Hydropunch technology. Results of laboratory analyses are summarized in Table <br /> f REPORTS/PAR1093.FNL 7 <br /> �l <br />