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22 December 1995 AGE-NC Project No 95-0101 Page 3 of 5 excavation to cover the piping Plastic sheeting was placed over this gravel, and the new USTs were installed over the plastic sheeting 3.0. PROCEDURES 3 1 MONITORING WELL PURGE PROCEDURES On 10 August 1995, a Solinst water level meter was used to measure the depth to ground water in each well relative to the top of the casing The relative ground water elevations and hydraulic gradient were determined from these data(Table 1) Each well was then purged using pre-cleaned PVC bailers Approximately 3 to 6 gallons (mrnimum of three well volumes) of water were removed from each well Temperature, pH and conductrvtty were measured at one-gallon intervals using an ICM water analyzer Stabilization data and field logs are included in Appendix A All purged water was stored in 55-gallon drums on-site 3 2 COLLECTION OF GROUND WATER SAMPLES Water samples were collected from each well using new disposable bailers Immediately upon retrieval, the samples were transferred into 40-m1 EPA vials preserved with hydrochloric acid The samples were transported in a chilled container to McCampbell Analytical, Inc (MAI) and analyzed for TPH-g and BTE&X in accordance with EPA methods GCFID/5030 and 662, respectively The laboratory report and chain-of-custody form are presented in Appendix B 3 3 SAMPLING AND DISPOSAL OF PURGED WATER On 19 June 1995, samples were collected from seven drums of purge water located on-site One 40- ml EPA vial of water was collected from each drum using a disposable bailer The samples were transported in a chilled container to MAI and composited for analysis for TPH-g and BTE&X Pernussion was obtained from the City of Lockeford to dispose of the purge water in the city sanitary sewer system On 30 June 1995, the purge water was disposed of into the city sewer system