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' 16 February 1999 iAGE-NC Project No 97-0290 Page 4 of 1 I I advance borings B4 through B7, and 8 25-inch diameter hollow-stem augers that were used to ' advance borings MW1 through MW7 The drill rig and two-man crew were supplied by Soils Exploration Services, Inc (SES)of Rancho Cordova, California Auger returns generated by drilling were placed in 55-gallon DOT-approved drums, labeled and stored on-site pending laboratory ' analysis ' Soil samples were collected ahead of the drill bit using a split-tube sampler loaded with three pre- cleaned brass sleeves Due to sampler breakage, 3-inch by 6-inch brass sleeves were used for the collected of six samples collected from boring MW3 The remaining samples were collected in 2- inch by 6-inch brass sleeves The samples were collected at five-foot intervals, beginning at a depth of 40 feet bsg in boring MW2, at a depth of 5 feet bsg in borings MW1, MW3, MW4, MW5 and B4 and at a depth of 25 feet bsg. in bonngs B5, B6, B7, MW6 and MW7 using a 140-pound hammer to ' advance the sampler 18 inches The number of blows required to advance the sampler in 6-inch increments was recorded on the boring logs Sampling equipment was washed in an Alconox solution and rinsed with water prior to each sampling run to avoid cross-contamination ' For each sample, both ends of the leading sleeve were covered with Teflon sheets, capped and sealed with tape The samples were labeled, stored on ice and transported under chain-of-custody to MAI ' Grab water samples were collected from borings B4 through B7 Prior to collection of the 55-foot p g g 5 oot ' soil sample, ground water was allowed to enter the augers A disposable bailer was lowered through the augers into ground water for sample collection The samples were transferred into 40-m1 VOA vials containing 0 5 ml 18% hydrochloric acid as a sample preservative and one-liter amber bottles 1 without the preservative After collection, the samples were properly labeled, placed in a chilled container and transported under chain-of-custody to MAI ' 33 LOGGING ' Sol] was extruded from a second brass sleeve and screened for the presence of organic vapor using an organic vapor meter equipped with a photo-ionization detector (PID Thermo Environmental 580A, 10 0 eV, calibrated to isobutylene),and the readings were recorded on the boring log The soil ' was then visually described in accordance with the Unified Soil Classification System(see Appendix A - Boring Logs) ' 34 WELL AND BORING COMPLETION Borings MW 1 through MW7 were completed as ground water monitoring wells using two-inch diameter PVC casing with 0 020-inch slotted screen installed from. 60 feet to 40 feet bsg with blank Advanced GeoFnx ironmentai,Inc