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Lamrnersvilfe School District <br /> July 16, 1990 2021899-7004 <br /> 12 <br /> 6.0 SUBSURFACE CONDITIONS <br /> The upper 3 to 4 feet of soil beneath the site consists of gravelly sand used for the shoulder of <br /> Hansen Road. beneath this layer, the soils underlying the subject site consist of interbedded layers of <br /> tan, sandy clay, and brown, medium-grained sand. With the exception of sand encountered near the <br /> water table at a depth of approximately 7 feet below grade in boring MW-6, none.of the soil la ers,�~. <br /> encountered in MW-6, MW-7;and MW-8 exhibited an � y u, x <br /> y petroleum hydrocarbon odors. A distribution of <br /> the soils encountered in MW-6,MW-7,and MW-8 is presented in the driil logs in Appendix ll, and cross- <br /> sections A-A'and 8-B'(Figure 4). The initial depth to groundwater encountered in MW-6,MW-7,and MW <br /> 8 during the drilling operation was 7 feet below ground Surface. Static groundwater levels measured in <br /> MW-6, MW-7, and MW-8 on Jane 21, 1990, were 7.16 feet, 7.34 feet, and 7.42 feet, respectively, below <br /> ground surface. Elevation surrey d to of the wells indicates groundwater is flowing in a northerly <br /> My direction, with a hydraulic gradient of approximately 0,009 ft/ft (Figure 3). <br /> 7.0 RESULTS OF CHEMICAL ANALYSES <br /> 7.1 SOIL <br /> 1 able 5 lists the soil samples submitted for chemical analysis, the depths belDw grade at which <br /> they were collected, and their corresponding PID readings. <br /> TABLE 5 <br /> SOIL SAMPLES SUBMITTED FOR ANALYSIS <br /> BORING SAMPL DEPTH feet <br /> ——LZ PID READING m <br /> o MW-6 MVV-6A 7 <br /> 1 <br /> MW-7 MW-7A g <br /> d.. 1 <br /> MW-8 <br /> MW-8A <br /> L' GROtJ=%ATER <br /> TECHNOLOGY,I:\C.. <br />