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19 January 1998 <br /> AGE-NC Project No 96-0229 <br />' Page 2 of 8 <br /> 2 2 1 SOIL SAMPLE COLLECTION <br />' Discrete soil samples were collected at 5-foot Intervals, beginning at 10 feet bsg, utilizing a <br /> California split-spoon sampler loaded with 2-inch by 6-inch brass sleeves, discrete soil samples were <br /> continuously cored from MW4 utilizing a 60-inch macro-core sampler The sampler was driven by <br /> dropping a 140-pound weight from a height of 30-inches The number of blows required to drive <br /> each 6-inch length of the sampler (blow counts) was recorded on boring logs by an AGE staff <br /> geologist <br /> Soil samples were preserved by covering both ends of the second brass sleeve with Teflon sheets, <br />' capping and sealing with tape Each preserved sample sleeve was labeled with soil probe boring <br /> location, depth, time, date and sampler's initials <br /> Each preserved sample was logged on a chain-of-custody form, placed in a chilled container and <br /> transported to Castle Analytical Laboratory(CAL),a California state-certified laboratory for analysis <br />' by EPA Method 8015-m for total petroleum hydrocarbons quantified as gasoline (TPH-g), by EPA <br /> Method 8020 for volatile aromatics (benzene, toluene, ethylbenzene and xylenes BTE&X) with <br /> methyl tertiary butyl ether (MTBE), and by EPA Method 8260 for tertiary butanol (TBA), di- <br /> isopropyl ether (DIPS), ethyl tert butyl ether (ETBE) and tert amyl methyl ether (TAME), and to <br /> confine and quantify MTBE if detected by EPA Method 8020 The results of the analysis are <br /> contained in Table 1 -Analytical Results Of Sail Samples <br /> 2 2 2 EQUIPMENT DECONTAMINATION <br />' Hollow stem augers were steam cleaned prior to bore hole advancement Sampling tools and brass <br /> g <br /> sleeves used for sample collection were thoroughly washed with a solution of Alconox, and <br />' thoroughly rinsed with clean tap water prior to each sampling run Following drilling activities, <br /> rinseate generated from decontaminating the equipment was placed in properly labeled D O T model <br />' 17H 55-gallon drums and was stored on-site in an area lacking public access <br /> 2 2 3 LOGGING <br /> During drilling activities, sample duplicates were monitored for the presence of organic vapor using <br />' an organic vapor meter equipped with a photo-ionization detector (PID Thermo Environmental <br /> 580A, 10 0 eV,calibrated to isobutylene) and were described on bonng logs using the Unified Soil <br /> Classification System (USCS) Boring logs are included as Appendix A General lithology beneath <br />' the site in cross sectional view is depicted on Figure Nos 3 and 4 - Geological Cross Sections A - <br /> A 'and B -B', respectively <br /> Advanced GeoEn\ironmental,Inc <br />