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14'September 1998. AGE-NC.ProJect No. 98-0:440 ' ,'-Page 4 ; _ of g if detected by EPA Method 8020., r The"results of the soil,analyses.,are contained inTable'"1. s " 3.1:2: .•Equipment Decontamination The hollow stem augers were steam.cleaned'prior-to'each bore hole advancement:Sampling tools' and brass sleeves used for sample collection were'thoroughly washed with a solution of Alconox,' t and thoroughly rinsed with cleaii;tap water prior'to'each sampling run. Following drilling activities,i 'rinseate generated from•decoritai.A ing the.equipment-was placed in properlylabeled R.O.T.-model 17H 55-galIon-drums an&was stored on-site in an area lacking public access. ' 3.1'.3:1 Logging During drilling activities, sample duplicates were monitored for.the presence of organic 'vapor using • an or anic-va or,meter a ui ed with a photo-ionization detector (PID: Thermo Environmental'.' 580A, 10.0 eV,�cal ibrated to isobutylene) and were described on•boring lags using the Unified Soil "Classificatiori System(USCS). Boring logs are included as Appendix A. General lithology beneath ' the site in cross sectional view is depicted on Figures 3 and 4: ' .3.1.4. '.Monitoring Well Completion, , ,•'. '� �. � _ n Soil borings"MW-`1"ithrough.,MW-4 "were single-completed as,,ground water'monitorig wells utilizing 2-inch diameter, schedule 40,blank polyvinylcholoiide (PVC) casing and'2-inchdiameter. Screened PVC.casing (0.020-inchslot) ' Eac ' was installed b 'lacin! the PVC well'casing assembl through the hollow.stem of the h well y p g g Y� g , augers to the total depth'of the boring:'The augers were incrementally_raised as.#3 Lonestar Lapis, Luster sand (filter pack) was slowly poured down the annulus between the well-casing and the inner ' wall of the hollow stem au er."The filter ack.was, Laced ad'aceni'to the screened casing from the g P P J , bottom'of the�,boring to:a paint'approximately two,feet above the top of the screel. Fohwing .. ' placement of the filter pack, a surge block was"inserted'irito.the'PVC casing arid was ower• then_ .y raised(suiged),repeatedly,forapprokimately'10 minutes.'Thereafter,the'depth to:the,top of the filter pack was measur•ed and bentonite chips (annular seal)placed above the filter pack:and,hydrated with clean tap water.•The remaining annular space was.sealed with portland type•H.cement: As-built well ' " consiruction•diagrams'are included as Figuies,5 through 8. i Advanced GeoEn'vironmental,Inc.