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24 October 1997 <br /> AGE-NC Protect No 96-0235 <br /> Page 4 of 11 <br /> f l <br /> AGE was not present to observe the backfilling operation <br /> 7 0. EXPLORATORY SOIL BORINGS - <br />' On 19 November 1996 AGE advanced four soil probe borings (B-5 through B-8) to further assess <br /> hydrocarbon-impacted soil and ground water as directed by the PHS-EHD Advancement'of all <br /> probe borings was accomplished utilizing AGE's van-mounted Geoprobe 5400 The Geoprobe was <br /> equipped with i 25-inch diameter probe rods with an attached 2 15-inch diameter soil sampler Soil <br /> probe boring locations are depicted on Figure 2 Soil samples were collected from all four probe <br /> i borings and grab ground water samples were retrieved from two probe borings (B-6 and B-8) Probe <br /> borings B-6 and B-8 were advanced to 30 feet bsg, B-5 was advanced to 25 feet bsg, and B-7 was <br /> advanced to 35 feet bsg <br /> t <br /> 71 SOIL SAMPLE COLLECTION <br /> Discrete soil samples were collected at five-foot intervals, beginning at 10 feet bsg in B-5 and B-6, <br /> at 5 feet in B-7, and at 15 feet bsg in B-8 The soil samples were retrieved utilizing a Geoprobe soil <br /> sampling assembly loaded with pre-cleaned 1125-inch by 6-inch brass sleeves Soil samples were <br /> preserved by covering the ends of the second brass sleeve with Teflon sheets, capping and sealing <br /> Ewith tape Upon preservation, each sample sleeve was labeled <br /> The soil samples were logged on a chain-of-custody form, ,stored in a chilled container and <br /> transported to MAI Selected soil samples were' analyzed in accordance with EPA method <br /> 5030/8015m for TPH-g and TPH-d, in accordance with EPA method 8020 for BTE&X and methyl <br /> tert-butyl ether (MTBE), and in accordance with EPA Method 418 1 for TRPH <br /> 4 <br /> 72 BORE-HOLE LOGGING <br /> During probe boring activities, sample duplicates were monitored for the presence of organic vapor <br /> using an organic vapor meter (OVM) equipped with a photo-ionization detector (PID Thermo <br /> Environmental 580A, 10 0 eV, calibrated to isobutylene) and described on boring logs using the <br /> Unified Soil CIassification System (USCS) Boring logs are summarized in Appendix B <br /> t <br /> 73 GROUND WATER SAMPLING <br /> I <br /> Grab water samples' <br /> were collected from probe borings B-6 and B-8 using a Geoprobe water <br /> Advanced GeoEmironmental,Inc <br />