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I04 February 2004 • AGE-NC Project No 95-0173 Page 3of10 In addition, a composite of the EW-1 soil samples collected at 20, 35, 50 and 65 foot were analyzed for total lead by EPA Method 7420 2 12 Sample 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 visually described on a boring logs in accordance with the Unified Soil Classification System (USCS) The boring log for EW-1 is included as Appendix B I2 1 3 Equipment Decontamination Prior to soil boring advancement,each section of hollow stem auger was pressure washed Sampling tools and brass sleeves used for sample collection were thoroughly washed with a solution of Alconox, and were thoroughly rinsed with clean tap water prior to each sampling sequence '. Following drilling activities,rinseate generated from decontaminating the equipment was placed in properly labeled DOT-approved model 17H 55-gallon drums and was stored at the site in an area lacking public access ' 2 14 Ground Water Extraction Well Completion The soil boring for EW-1 was single-completed as a ground water extraction well utilizing an ' assembly of 6-inch diameter,schedule 40,blank polyvinylchloride(PVC)well casing and perforated, 6-inch diameter PVC well casing(0 030-inch slot) The extraction well was installed by placing the PVC well casing assembly through the hollow stem of the augers to the total depth of the boring The ' hollow stern augers were incrementally raised as a filter pack material consisting of a 50/50 blend of No 3 Lonestar Lapis Luster sand and fine-grain aquarium gravel was slowly poured down the annulus between the well casing and the inner wall of the hollow stem auger The filter pack was placed adjacent to the screened casing from the bottom of the boring to a point approximately two feet above the top of the screen, following filter pack placement, a 6-inch surge block was inserted into the well casing and was alternately raised and lowered (surged)repeatedly for approximately ' 20 minutes Immediately thereafter, EW-1 was developed utilizing an air compressor with attached 1-inch diameter hosing to air-lift any sediment that may accumulated at the bottom of the well Development ground water was air-lifted out from the well until the ground water was visually sediment free, approximately 150 gallons (3 drums) of water was removed from EW-1 Purged 0 Advanced GeoEnvaronmental,Inc