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1 <br /> 4 August 1995 <br /> AGE-NC-95-0120 <br /> Page 3 of 5 <br /> ' 3.4. PROCEDURES <br /> 3 1 MONITORING WELL PURGE PROCEDURES <br /> ' <br /> On 31 March and 21 June 1995, a Sohnst water level meter was used to measure the depth to ground <br /> water in each well relative to the top of the casing The relative ground water elevations and hydraulic <br /> ' gradient were determined from these data(Table 1) <br /> Each well was then purged using precleaned PVC bailers Approximately 8 gallons (minimum. of three <br /> ' well volumes) of water were removed from each well Temperature, pH and conductivity were <br /> measured at one-or two-gallon intervals using an ICM model 52200 water analyzer All purged water <br /> ' was stored in 55 gallon drums on-site Ground water depths were re-measured prior to sampling to <br /> assure a minimum of 80%recharge in each well Stabilization data and field logs for both monitoring <br /> events are included in Appendix A GeoAudit performed monitoring procedures on 31 March 1995, <br /> ' AGE performed monitoring procedures on 21 June 1995 <br /> 3 2 COLLEC'T'ION OF GROUND WATER SAMPLES <br /> After purging, water samples were collected from each well using new disposable bailers <br /> ' Immediately upon retrieval, the samples were transferred into 40-m1 EPA vials preserved with <br /> hydrochloric acid and 1-liter amber bottles The samples transported in a chilled container to Alpha <br /> Analytical Laboratories(AAL) in Ulaah and analyzed for TPH-g, TPH-d and BTE&X in accordance <br /> ' with EPA methods 5030, 8015m and 602, respectively <br /> ' 4.0. FINDINGS <br /> 4 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> ' he relative elevation of ground water in each well was calculated by subtracting the depth to water <br /> T <br /> from the surveyed relative casing elevation(Table 1) Ground water rose an-average of 2 22 feet <br /> ' between September 1994 and March 1995,an average rise of 0 99 feet was measured between March <br /> and June 1995 <br /> ' In March 1995,the gradient was calculated to be 0 0020 ft/ft (0 2 %) in a northeasterly direction (N <br /> 62° E, Figure 3)_ In June 1995, the gradient was calculated to be 0 0039 ft/ft (0 39 %) in a <br /> ' northeasterly direction (N 69° E, Figure 4) The March 1995 gradient is slightly more shallow than <br /> previous calculations The ground water flow direction continues to shift towards the east <br />