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18 December 1997 AGE-NC Project No 95-0173 Page 3 of 10 by dropping a 140-pound weight from a height of 30 inches The number of blows required to drive each 6-inch length of the sampler (blow counts) was recorded on boring logs by an AGE staff geologist Soil samples were preserved by covering both ends of the second brass sleeve with Teflon sheets, capping and sealing with tape Each preserved sample sleeve was labeled with soil probe boring location, depth,time, date and sampler's initials Each preserved sample was logged on a chain-of- custody form, placed in a chilled container and transported to Castle Analytical Laboratory (CAL), a California state-certified laboratory for analysis by EPA Method 8015-m for TPH-g and TPH-d, by EPA Method 8020 for BTE&X with MTBE, and by EPA Method 8260 for TA, DI PE, MTBE and TAME,and to confirm and quantify any MTBE detected by EPA Method 8020 The results of the laboratory analysis are contained in Table 4 -Analytical Results Of Soil Samples 2 3 2 EQUIPMENT DECONTAMINATION The hollow stem augers were steam-cleaned prior to bore hole advancement Sampling tools and brass sleeves used for sample collection were thoroughly washed with a solution of Alconox, and thoroughly rinsed with clean tap water prior to each sampling run Following drilling activities, rinseate generated from decontaminating the equipment was placed in properly labeled D O T - approved, model 17H 55-gallon drums and stored on-site in an area lacking public access During drilling activities, soil cuttings were stockpiled on plastic sheeting in an area at the site lacking public access 2 3 3 LOGGING During drilling activities, soil sample duplicates were monitored for the presence of organic vapor using an organic vapor meter equipped with a photo-ionization detector (PID Thermo Environmental 580A, 10 0 eV,calibrated to isobutylene) and were described on boring logs utilizing the Unified Soil Classification System(USCS) Boring logs are summarized in Appendix B General lithology beneath the site in cross sectional view is depicted on Figure Nos 4 and 5 - Geological Cross Sections A -A 'and B - B', respectively 24 IN-SITU AIR SPARGING WELL INSTALLATION Soil borings AW-1 and AW-2 were dual-completed as in-situ air sparging (IAS) wells by utilizing schedule forty 2-inch diameter blank polyvinylcholoride (PVC)casing and 2-inch diameter screened Advanced CcoEnvironmenlal,Inc