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6.0 DISCUSSION OF RESULTS <br /> The results of the field investigation and.laboratory analyses are discussed in the <br /> following section. <br /> 6.1 SOIL <br /> The description of the subsurface conditions provided herein was obtained from <br /> the on-site observations of soil samples. The soil stratigraphy at the subject site <br /> was generally consistent between soil borings. Biased on the observations of <br /> discrete soil samples, the general soil stratigraphy is characterized as follows: <br /> f <br /> • Asphalt or concrete surfacing <br /> I • Dark yellow brown silty clay; moist; moderate plasticity <br /> • Yellow brown clayey silt; wet <br /> • Yellow brown silty sand; wet; moderate cohesion <br /> Ll • Yellow brown clayey silt; wet; highly cohesive <br /> Detailed drilling logs are contained in Appendix B. - <br /> Laboratory results revealed that concentrations of TiPH-G and BTEX were below <br /> analytical detection limits for soil samples analyzed from each boring location. <br /> 6.2 GROUNDWATER <br /> 1' <br /> The hydrologic gradient for the site was calculated using water level <br /> measurements obtained from monitoring wells MW,1,2, and 3 on February 29, <br /> { 1996, and April 5, 1996, and the vertical elevations of the monitoring wells, <br /> surveyed by Enke and Associates, Inc., on March ',122, 1996. According to the <br /> data, the hydrologic gradient for the site is towards 'the north. Two groundwater <br /> contour maps, indicating the hydrologic gradient for�each groundwater sampling <br /> event, are included in Appendix A. <br /> � P <br /> Laboratory results revealed that concentrations of TPH-G and BTEX were below <br /> r <br /> analytical detection limits for both rounds of groundwater samples collected from <br /> Yt 9 p <br /> the three on-site monitoring wells. <br /> _ 11 - <br />