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17 April 2002 <br /> AGE-NC Project No. 01-0872 <br /> Page 3 of 6 <br /> r <br /> 3.1. DRILLING <br /> Soil probe borings B 1 through B3 were advanced utilizing a van-mounted Geoprobe 5400 equipped <br /> with 1.125-inch diameter probe rods with an attached 2.15-inch diameter soil sampler,using"direct <br /> push" technology. The probe borings were advanced vertically to depths of 30 feet bsg. <br /> &W 3.2. SOIL SAMPLING <br /> ' Discrete soil samples were collected at 5-foot intervals,beginning at 5 feet bsg in boring B3, at 10 <br /> feet bsg in boring B 1 and at 15 feet bsg in boring B2 to the total depth of each boring(30 feet bsg). <br /> Soil samples were collected using a Geoprobe soil sampling assembly loaded with four pre-cleaned <br /> 1.125-inch by 6-inch brass sleeves. Soil samples were preserved by covering both ends of the brass <br /> ... sleeve with Teflon sheets,capping, and sealing with tape. Each sample sleeve was labeled with soil <br /> probe boring location, depth, time, date and sampler's initials. Then each sleeve was logged on a <br /> chain-of-custody form, placed in a chilled container and transported to Cal Tech Environmental <br /> +r Laboratories (CTEL), a State of California Department of Health Services-certified laboratory. <br /> 3.3. SOIL ANALYSES <br /> Selected samples were analyzed for the following: <br /> • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) in <br /> accordance with EPA Method 8015 Modified; <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl-tertiary butyl ether <br /> y (MTBE) in accordance with EPA Method SW846 8021; and <br /> 46. Fuel additives including: MTBE, tertiary-butyl alcohol (TBA), di-isopropyl ether(DIPE), <br /> ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether(TAME), ethylene dibromide <br /> (EDB) and 1,2-dichloroethane (1,2-DCA)by EPA Method 8260B. <br /> ` 3.4. SOIL LOGGING <br /> During drilling,sample duplicates were monitored for the presence of organic vapor using an organic <br /> vapor meter equipped with a photo-ionization detector(PID:Thermo Environmental 580A, 10.0 eV, <br /> calibrated to isobutylene)and were visually described on boring logs in accordance with the Unified <br /> Soil Classification System (USCS). Boring logs are included as Appendix A. <br /> ii Advanced GeoEnvironmental,Inc. <br /> x <br /> M <br />