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' 08 January 1996 . AGE-NC Project No 95-0104 Page 2 of 4 September 1993 TPI:-g and aromatic hydrocarbons (benzene, toluene, ethyl benzene and xylene BTE&X) were not detected in any of the soil samples analyzed Only a single compound of HVO, bromomethane, was detected in soil sample MW4-45 at 0 43 gg/g(ppm) On 04 April 1995, another well, VW-1, was installed at the site near the center of the former UST for future remediation purposes This well was drilled to a total depth of 80 feet and completed as a 4-inch diameter remediation well with slotted casing from 22 to 72 feet TPH-g was detected in sample VW1-25 at a concentration of 14,000 ppm rOn 24 July 1995, samples were collected from 29 drums on-site using PVC bailers and transported to a state certified laboratory for analysis The 29 samples were composited at the laboratory into three samples for analysis Each composite sample was analyzed for TPH-g, BTE&X and HVO ' Toluene was detected from composite sample WS-3 at a concentration of 0 44 gg/L Trace levels of several HVO were detected from composite samples WS-2 &3 I 3.0. PROCEDURES 3 1 MONITORING WELL PURGE PROCEDURES ' On 25 October 1995, the depth to ground water in ground water monitoring wells was measured to the nearest 0 01 foot utilizing a Sohst water level meter The relative elevation of ground water in each well was calculated by subtracting the depth to ground water from the surveyed relative casing elevation(Table 1) Relative ground water elevations were plotted on a scaled site map, whereupon ground water elevation contours were generated (Figure 3) ' After water levels were measured, three well volumes of ground water were purged from each well Approximately 3 gallons of water were removed from MW-1 utilizing a disposable polyethylene bailer and new nylon rope, approximately 50 to 70 gallons of ground water were removed from MW-2 ' through MW-4 utilizing a Grundfos Reda-Flo II submersible pump Temperature, pH and conductivity were measured at well volume intervals in each well using an ICM model 52200 water analyzer Stabilization data and field logs are included in Appendix A Purged water was stored in 55-gallon ' drums stored on-site in an area inaccessible to the general public ' 3 2 GROUND WATER SAMPLING ' Monitoring wells MW-1 through MW-4 were purged and allowed to recover for a minimum of one hour prior to sample collection Water samples were collected from MW-1 through MW-4 utilizing i' a dedicated, disposable polyethylene bailer and new nylon rope Sufficient sample was collected from each well to fill four 40-m1 EPA vials preserved with hydrochloric acid Care was taken to