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11 April 2003 <br /> AGE-NC Project No 01-0865 <br /> Page 3 of 9 <br /> initials The preserved samples were logged on a chain-of-custody form,placed in a chilled container <br /> and subsequently transported to CTEL for analysis The ground water samples were analyzed for the <br /> same chemical constituents as the soil samples (see Section 2 3 ) <br /> 2 6 EQUIPMENT DECONTAMINATION <br /> Pnor to sample collection, Geoprobe soil and ground water sampling equipment was thoroughly <br /> rinsed with clean water after washing with a solution of Alconox Geoprobe rods were thoroughly <br /> cleaned prior to soil probe boring advancement <br /> 3.0. FINDINGS <br /> Soil descriptions from boring logs for B 11,B 12 and B 13, supplemented with soil descriptions from <br /> previous site investigations,were utilized to construct the site geological model,laboratory analysis <br /> of soil and ground water samples were utilized to assess the petroleum-hydrocarbon impact on soil <br /> and ground water <br /> 3 1 SOIL PROFILE <br /> Borings BI I and B12 were advanced at the former USTs location at the eastern edge of the levee <br /> (Figure 2) The upper 2 feet of core(between 10 and 12 feet bsg) consisted of a dry,brown, poorly- <br /> sorted coarse-grained sand, an approximately 1-foot whitish pebble zone encountered at <br /> approximately 12 feet bsg may be road-base material from a previous levee surface Dry to moist, <br /> tan to dark brown silty sand with gravel was encountered from 14 to 18 feet bsg Moist to saturated <br /> black peat was recovered between 18 and 35 feet bsg, an approximately 2-foot thick, porous zone <br /> of black peat encountered between 25 and 27 feet bsg appeared to be composed of fibrous,root-like <br /> material Moist to saturated, olive green, well-sorted to silty fine sand was encountered from 35 to <br /> 45 5 feet bsg, and stiff and hard, olive green-blue clay was observed from 45 5 feet to total depth at <br /> 46 feet bsg <br /> Boring B 13,located at the base of the levee(Figure 2),consisted of saturated black peat from surface <br /> grade to approximately 16 feet bsg A moist to saturated, grayish green interval consisting of inter- <br /> bedded medium sand and silty fine sand was encountered from 16 feet bsg to 24 feet bsg Underlying <br /> the sandy layer was a 2-foot section of dry to moist, olive green silty clay, followed by a basal silt <br /> to total depth at 26 feet bsg Boring logs are included in Appendix B <br /> Advanced GeoEnwronmental,Inc <br />