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,, 15 <br /> August 1996 <br /> AGE-NC Project No. 95-0185 <br /> Page 4of8 <br />.' Both ends of the leading sleeve were covered with Teflon sheets, capped and sealed with tape to <br /> preserve the sample for laboratory analysis. The samples were then labeled and stored in a chilled <br /> container, and were transported under chain-of-custody to MAI. Each sample was analyzed for total <br /> petroleum hydrocarbons quantified as gasoline(TPH-g),TPH-d,BTE&X and methyl-tert-butyl ether <br /> (MTBE) in accordance with EPA methods 5030/8015m, 5030/8015m, 8020 and 8020,respectively. <br /> During drilling, auger returns were monitored for the presence of organic vapors using a photo- <br /> ionization detector(PID: Thermo Environmental 580A, 10.0 eV, calibrated to isobutylene). Auger <br /> ' returns were then placed on plastic sheeting and stored on-site pending laboratory analysis. <br /> 3.2.2. LOGGING <br /> Soil was extruded from the second brass sleeve and screened for the presence of organic vapors, <br /> ' using a PID, and the readings were recorded on the boring logs. The soil was then described in <br /> accordance with the Unified Soil Classification System (see Boring Logs, Appendix B). <br /> y3.2.3. WELL COMPLETION <br /> ' Borings B 1, B2 and B3 were completed as 2-inch diameter ground water monitoring wells using <br /> 0.02-inch slotted screen,PVC casing from 14 to 34 feet bsg. The filter pack (42 Lonestar Sand)was <br /> installed from 12 to 34 feet bsg, extending two feet above the screened interval. <br /> Boring B4 was completed as a 4-inch diameter ground water monitoring well using 0.02-inch slotted <br /> ' screen, PVC casing from 15 to 30 feet bsg. Bentonite chips were used to make a two-foot plug in <br /> each well,then Portland Cement was used to seal the wells to the surface. As-built well diagrams <br /> for each well are depicted in Appendix C. <br /> 3.2.4. MONITORING WELL PURGE PROCEDURES <br /> On 24 June 1996,,the water level in each monitoring well was measured relative to the top of the <br /> well casing using a Solinst water level meter. The depths to ground water and relative ground water <br /> elevations are depicted in Table I -Relative Ground Water Elevation.-A thin sheen of free product <br /> was present in MW-1 and MW-4; however an MMC interface probe'was unable to measure the <br /> product thickness. <br /> a - <br /> After water levels were measured, a two-stage submersible pump was used to surge and purge each <br /> n <br /> well.Twenty gallons of water were removed from MW-1;MW-2 and MW-3 (minimum ofthree well <br /> 1.,1 <br />