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03 September 2004 <br /> AGE-NC Project No 98-0448 , <br />' Page 4 of 13 <br />' of the screen Following filter pack placement at AW-5, a surge block was inserted Into the well <br /> casing and was alternately raised and lowered(surged)repeatedly for approximately 10-20 minutes <br /> Approximately 2'/2 feet of bentonite chips(annular seal)were placed above the filter pack and were <br />' hydrated with clean tap water The remaining annular space was backfilled with portland cement <br /> (grout seal) As-built monitoring well-construction diagrams are shown on Figures 4 and 5 <br /> t <br />' 2 5 SVE AND IAS WELL INSTALLATION FINDINGS <br />' SVE/IAS well Installation soil descriptions were utilized to construct geologic cross section C-C' <br /> beneath the site, field data was utilized to select soil samples for laboratory analysis Petroleum <br /> hydrocarbon-Impact to soil was assessed and quantified by laboratory analysis <br />' 2 5 1 STRATIGRAPHY <br /> Generally,less permeable,fine sandy silt was observed from wells VW-6 and AW-5 at depths of 15 <br /> feet bsg,more permeable,silty fine sands and fine to medium sands were encountered from the same <br /> borings at depths between 20 feet and 35 feet bsg Bonng logs are included in Appendix B General <br /> llthology beneath the site Is depicted in cross-section C-C'(Figure 3) <br /> 2 5 2 FIELD EVIDENCE OF HYDROCARBON-IMPACTED SOIL <br />' No hydrocarbon odor was noted from VW-6 soil samples, however faint to moderate hydrocarbon y <br /> odor was noted between 20 and 35 feet from AW-5 soil samples Hydrocarbon odor observations <br /> Iare noted on the boring logs in Appendix B <br /> Organic vapor (confirmed with the PID) was noted in AW-5 soil samples between 15 feet and 35 <br />' feet bsg and in VW-6 soil samples between 15 feet and 20 feet at concentrations as high as 321 parts <br /> per million (ppm) Organic vapor observations are noted in boring logs in Appendix B <br /> 2 5 3 ANALYTICAL RESULTS OF SOIL SAMPLES <br /> A total of six soil samples were submitted to McCampbell Analytical, Inc (MAI), a DHS-certified <br /> laboratory for analysis of petroleum hydrocarbons <br /> Advanced GeoEnvironmental,Inc <br /> I ' f <br />