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15 August 1996 <br /> AGE-NC Project No. 95-0185 <br /> 1 Page 2 of 8 <br /> t (bsg).Regional ground water flow direction in the area of the site is toward the southwest; however, <br /> flow direction can vary locally and seasonally. <br />' 3.0. PROCEDURES <br /> 1 3.1. ADVANCEMENT OF SOIL PROBE BORINGS <br />' 3.1.1. PROBING AND SAMPLING <br /> On 12 December 1995, five(5) soil probe borings were advanced at the site. Probing locations are <br /> illustrated on Figure 2. The borings were advanced using AGE's van-mounted Geoprobe 5400 soil <br /> probing machine equipped with a 1.375-inch diameter soil sampler on the leading end of the probe <br /> rods. <br />' Probings P1 and P2 were advanced west and south of the former UST excavation, respectively. <br /> Probing P3 was located approximately 55 feet south of the former UST excavation. Probing P4 was <br /> advanced in the center of the former diesel UST excavation. Probing P5 was advanced on the <br /> northeast corner of the site, east of the former UST excavation. All probe borings were advanced to <br /> approximately 25 feet bsg. <br /> Discrete soil samples were collected in each probing at 5-foot intervals beginning at a depth of 5 feet <br /> bsg using a 1.375-inch diameter, two-foot long, piston type sampler loaded with four pre-cleaned <br /> ' . 1,125-inch diameter, 6-inch length brass sleeves. The sampling equipment was washed in an <br /> Alconox solution and rinsed with water prior to each sampling run to prevent cross-contamination. <br /> Upon sample.retrieval,both ends of the second brass sleeve were covered with Teflon sheets,capped <br /> and sealed with tape. Samples were then labeled and placed in a chilled container, and transported <br /> ' under chain-of-custody to Me Campbell Analytical Laboratories, Inc. (MAI) in Pacheco, California. <br /> 3.1.2. SOIL LOGGING <br /> Soil was extruded from the remaining brass sleeves and screened for the presence of organic vapors <br /> using a photo-ionization detector (PID: Thermo- Environmental 580A; 10.0 eV, calibrated to - <br /> isobutylene), and the readings were recorded on the Boring Logs (Appendix A). The soil was <br /> described in accordance with the Unified Soil Classification System. <br />