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10 September 1996 <br /> AGE-NC Project No. 95-0106 <br /> Page 3 of 8 <br /> Each probe boring was advanced to a depth of 6 feet bsg. Discrete soil samples were collected in <br /> each probe boring at 2-foot intervals beginning at a depth of 3 feet bsg; samples were collected using <br /> a 1.375-inch diameter, two-foot long,piston type sampler loaded with four pre-cleaned 6-inch brass <br /> sleeves. The sampling equipment was washed in an Alconox solution and rinsed with water prior <br /> to each sampling run to avoid 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 placed in a chilled container and transported under chain-of- <br /> custody to McCampbell Analytical, 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 vapor <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 />• <br /> 3.1.3. GRAB GROUND WATER SAMPLE COLLECTION <br /> Grab ground water samples were collected from Probe Borings P1, P2, P4, P5, and P6 using a <br /> Geoprobe water sampling assembly. Probe rods were extended into ground water, then pulled back <br /> to expose a water sampler screen interval. Ground water was allowed to enter the sampler, and <br /> samples were retrieved using a modified PVC tubing bailer. <br /> After sample retrieval, the sampler was disassembled and cleaned between each sampling event. <br /> New PVC tubing was used for each sample. Samples were collected in 40-m1 EPA vials containing <br /> hydrochloric acid for sample preservation, and 1-liter amber bottles. The samples were placed in a <br /> chilled container and transported under chain-of-custody to MAI for analysis. <br /> 3.1.4. LABORATORY ANALYSIS <br /> Selected soil and ground water samples were analyzed for total petroleum hydrocarbons quantified <br /> as gasoline(TPH-g) and volatile aromatics (benzene, toluene, ethyl benzene and xylenes: BTE&X) <br /> Soil samples were analyzed in accordance with EPA methods 5030/8015m, 8020; ground water <br /> samples were analyzed in accordance with methods 5030/8015m and 602. <br />