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1 <br />' 29 January 2001 <br /> .� AGE-NC Project No 00-0725 <br />' Page 5 of 11 <br />' 3 5 BACKFILLING OF EXCAVATION AND DISPOSAL OF HYDROCARBON-IMPACTED <br /> SOIL <br /> The excavation was backfilled and compacted with approximately 60 cubic yards of pea gravel to <br /> the upper portion of the water table and clean fill sand was then roll compacted with a sheep's foot <br /> wheel into the excavation to the surface grade <br /> On 09 November 2000, approximately 236 5 metric tons of excavated soil was transported from the <br /> site and disposed at Forward Landfill The manifests with weight master certificates etc are attached <br />' in Appendix A <br />' 3 6 DRILLING AND SAMPLING <br /> In 29 November 2000, five soil borings were advanced at the site Each soil borings was advanced <br />' using a CME-75 drill ng, equipped with 8 25-inch diameter hollow-stem augers The drill rig and <br /> two-man crew were supplied by West Hazmat Drilling Auger returns generated by drilling were <br />' stockpiled on site, pending laboratory analysis <br /> Soil samples were collected ahead of the drill bit using a California modified split-spoon sampler <br />' loaded with three pre-cleaned 2-inch by 6-inch brass sleeves The samples were collected from <br /> monitoring well pilot bonngs MW1 through MW5 at five-foot intervals, beginning at 5 feet bsg <br /> using a 140-pound hammer to advance the sampler The number of blows required to advance the <br />' sampler over each 6-inch increment of the 18-inch sampling interval was recorded on the boring <br /> logs Sampling equipment was washed in an Alconox solution and rinsed with water prior to each <br /> sampling run to minimize cross-contamination of the samples <br /> lBoth ends of the leading or other selected sleeve were covered with Teflon sheets, capped and sealed <br /> with tape The samples were labeled, stored on ice and transported under chain-of-custody to <br />' McCambell Analytical, Inc (MAI) in Pacheco, California, DHS-certified analytical laboratory <br /> I37 LOGGING <br /> Soil was extruded from a second brass sleeve or from the unpreserved portions of the soil in the core <br /> barrel samples and was screened for the presence of organic vapor using an organic vapor meter <br /> (OVM) equipped with a photo-ionization detector (PID Thermo Environmental 580A, 10 0 eV, <br /> calibrated to isobutylene), and the OVM readings were recorded on the boring log The soil was then <br /> visually described in accordance with the Unified Soil Classification System (see Appendix B) <br /> IAdvanced GeoEnvironmental,Inc <br />