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04 November 2008 <br />AGE-NC Project No. 02-0926 <br />Page 2 of 5 <br />pilot borings at 5-foot intervals, beginning at 5 feet bsg, using a 140-pound hammer to advance the <br />sampler. The number of blows required to advance the sampler over each 6-inch increment of the <br />18-inch sampling interval was recorded on the boring logs (Appendix B). <br />After sample recovery, both ends of the middle sleeve were covered with Teflon sheets, capped, and <br />sealed with tape. The sealed sample sleeves were labeled, stored on ice, and transported under chain <br />of custody to Cal Tech Environmental Laboratories (CTEL), a State of California Department of <br />Public Health (CDPH)-certified analytical laboratory in Paramount, California. Selected soil samples <br />were analyzed for: <br />Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br />accordance with EPA Method 8015 Modified; and <br />Benzene, toluene, ethylbenzene, and total xylenes (BTEX) and fuel oxygenates di-isopropyl <br />ether (DIPE), methyl tertiary-butyl ether (MTBE), ethyl tertiary-butyl ether (ETBE), <br />tertiary-amyl methyl ether (TAME), tertiary-butyl alcohol (TBA), 1,2-dichloroethane <br />(1,2-DCA), and 1,2-dibromoethane (EDB) in accordance with EPA Method 8260B. <br />Sampling equipment was washed in an Alconox solution and rinsed with water prior to each <br />sampling run to minimize cross-contamination. <br />2.2. LOGGING <br />Soil was extruded from the remaining brass sleeves and screened for the presence of organic vapor <br />using an organic vapor meter (OVM) equipped with a photo-ionization detector (PD: Thermo <br />Environmental 580B, 10.0 eV, calibrated to isobutylene); the OVM readings were recorded on the <br />boring log. The soil was then visually described in accordance with the Unified Soil Classification <br />System. Boring logs are provided in Appendix B. <br />2.3. WELL COMPLETIONS <br />Pilot borings MW4,MW5, and MW6 were completed as ground water monitoring wells using 2-inch <br />diameter polyvinylchloride (PVC) casing with a 0.010-inch slotted screen installed from 35 feet to <br />55 feet bsg(MW4 and MW5) and 70 feet to 75 feet bsg (MW6). Filter pack (No. 3 Lonestar sand) <br />was installed from total depth to approximately one to two feet above the slotted screen, and a <br />nominal 1 to 2-foot bentonite plug was installed above the filter pack and hydrated. <br />Advanced GeoEnvironmental, Inc.