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r..+ KLEINFELDER <br /> -� 3 FIELD ACTIVITIES <br /> z <br /> 3.1 SOIL-GAS SURVEY <br /> On March 1, 1990, a soil-gas survey was conducted by Tracer Research. An attempt to <br /> extract soil-gas was made at 14 locations, A through N, as shown on Plate 2. In most <br /> locations, the impermeable nature of the soil did not allow gas to be extracted. For this <br /> reason,the probe was pushed one to two feet deeper and ground water was extracted. Soil. <br /> gas was extracted at depths of three feet and four feet at locations E and F, respectively. <br /> Ground water samples were extracted from depths of seven feet at locations B, C and E; <br /> eight feet at locations F,H, K, M and N;and at 10, 11 and 13 feet at locations 1, A, and D <br /> r respectively. After the sample was extracted, the holes were filled with bentonite pellets, <br /> and distilled water was poured into the holes to hydrate the bentonite and seal off the <br /> �- holes. Soil-gas and water samples were analyzed on site by GC/FID. <br /> The mobile laboratory, GC/FID, is not a state certified for these analyses and was used to <br /> serve as a preliminary screening tool. To obtain quantitative data, information from the <br /> soil-gas survey is used to collect confirmatory samples from soil borings, which are <br /> submitted to a state certified laboratory for analysis. <br /> Soil-gas survey protocol and results are presented in Appendix B, "Shallow Soil Gas and <br /> Ground Water Investigation." <br /> 3.2 SOIL BORINGS <br /> t-� <br /> On March 6, 1990, three soil borings were drilled at the Weber Avenue Site. Soil borings <br /> were placed at locations designed to confirm the boundaries of potentially affected soil as <br /> `rte <br /> indicated by the soil-gas survey. Soil borings were drilled to an approximate depth of 7.5 <br /> feet and soil samples were collected at depths of 15 feet,45 feet, and 7.5 feet (Table 1). <br /> Generally fine silty sand or silty clays were encountered. Locations of the soil borings are <br /> shown on PIate 3. Drilling protocol is described in Appendix B. <br /> On the oasts of field observations and qualitative-field scseeniaig�one of the-multiple <br /> }e samples collected from each boring was selected for chemical analysis- Table 2 is a log of <br /> F15-90-101 3 <br /> }� cWight 1990 Kteinfetder, Inc. <br /> T9 <br />