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T <br /> • 10 September 2004 <br /> AGE-NC Prod ect No 03-1100 <br /> Page 4 of 10 <br /> 3 1 WELL INSTALLATION PROCEDURES <br /> Between 15 and 17 December 2003, a total of eight soil borings were advanced at the site Borings <br /> SVE1,SVE2 and ozone well,OZ3 were advanced at the north edge of the excavation area where the <br /> former USTs were located to vertical depths of 27, 35 and 62 feet bsg OZ1 was advanced in the <br /> southeast corner of the property to a vertical depth of 62 5 feet bsg Bonngs SVE3 through SVE5 <br /> and OZ2 were advance at the southwest corner of the property to vertical depths of 20, 30, 35 and <br /> 62 feet bsg Boring locations are depicted on Figure 2 <br /> The borings were advanced with a CME-75 drill rig equipped with 8 25-inch diameter hollow-stem <br /> augers The drill ng and three-man crew were supplied by Cascade Drilling Incorporated of Rancho <br /> Cordova, California Auger returns generated by drilling were stored on-site in Department of <br /> Transportation (DOT)-approved 55-gallon drums <br /> 3 1 1 Soil Sample Collection <br /> Discrete soil samples were collected using a 140-pound hammer to advance a California-modified <br /> split-spoon sampler The number of blows required to advance the sampler over each 6-inch <br /> increment of the 18-inch sampling interval were recorded on the boring logs Sampling equipment <br /> was washed in an Alconox solution and rinsed with water prior to each sampling run to minimize <br /> cross-contamination <br /> Soil samples were collected at five foot intervals, beginning at 5 feet bsg, or where soil was <br /> previously uncharactenzed Generally deeper soil samples were collected, so as not to duplicate <br /> previous sampling Soil samples were preserved by covering both ends of the second brass sleeve <br /> with Teflon sheets, capping and scaling with tape Each preserved sample sleeve was labeled with <br /> soil boring location, depth, time, date and sampler's initials and was stored in a chilled container <br /> under ice <br /> Soil encountered in the borings was visually classified on a boring log by an AGE geologist in <br /> accordance with the Unified Soil Classification System (USCS) Additionally, soil samples were <br /> selectively field-screened for the presence of volatile organic compounds using an organic vapor <br /> meter (OVM) equipped with a photo-ionization detector (PID Thermo Environmental 580B, <br /> 10 0 eV, calibrated to isobutylene), the concentration readings were recorded on the boring log <br /> Boring logs are included in Appendix A <br /> Advanced GeoEnvironmental,Inc <br />