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06/24/2002 15 42 2094671118 AGE STOCKTON PAGE 03 • 31 Januaiy 2002 AGE-NC Project No 95-0128 Page 2 of 8 2 1 1 Soil Sampling Soil samples were collected from boring EW 1 at five-foot intervals,beginning at 30 feet bsg utiliaing a California split-spoon sampler loaded with 2-mch by 6-inch brass sleeves The sampler was driven by dropping a 140-pound weight from a height of 30 Triches The number of blows requn ed to drive each 6-inch length of the sarnplei (blow counts) was reeoi ded on boring logs by an AGE staff geologist, boring logs are in Appendix.A. Soil samples were preserved by coveting both ends of the second brass sleeve with Teflon sheets, capping and sealing with tape Each preserved sample sleeve was labeled with soil boring designation, depth, time, date and sampler's initials The soil samples duplicates, from 30 feet to 45 feet bsg, were monitored for the presence of organic vapor using an organic vapor metes equipped with a photo-ionization detector (PID Thermo )Envn onmental 580A, 10 0 eV,calibi atedto isobutylene) The soil samples were collected specifically for permeability analysis 2 1 2 Equipment Decontamination The hollow stem auger s were pi a-cleaned pi ioi to advancement of each soil pilot boring Sampliiig tools and brass sleeves used for sample collection were thoroughly washed with a solution of Aleonox, and were thoroughly rinsed with clean tap water pnoi to each sampling sequence All sampling equipment was washed in an Alconox solution and rinsed twice with water prior to each sampling run Following drilling activities, rinscat e generated fi om decontaminating the equipment was placed in properly labeled DOT-approved model 17H 55-gallon drums and placed in the southeast portion of the site 2 2 WELL COMPLETION Borings EWI and EW-2 were smgle-completed as giound water extraction wells (EW-1 and EW-2) Utilizing schedule 40, 6-inch diameter blank polyvinylchloride (PVC) well casing and perforated, 6- inch diameter PVC well casing (0 020-inch slot) The wells was installed by placing the PVC well casing assembly through the hollow stem of the augers to the total depth of the boring The augei s wei a incrementally raised as filter pack material was slowly poured down the annulus between the well casing and the inner wall of the hollow stein auger The filter pack material placed consisted of a 50/50 blend of fine grained aquarium gravel(3/8 gavel) and 2/12 Monterey Sand The filtei pack was placed adjacent to the screened casing from the �� Advaarcd Ge*Euvur9wmcn41 Inc