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} <br /> I ' <br /> 20 June 1995 <br /> AGE-NC-95-0111 <br /> Page 2 of 3 <br />' from the borings mchcated low concentrations of petroleum hydrocarbons in four of the five borings <br /> Impacted ground water was present in samples from two of the three monitoring wells <br />' Prior to March 1995, ground water samples have been collected on three occasions from each well <br /> at the site Ground water depth at the site is approximately 8 feet, with a prevailing flow direction to <br /> r the north to northeast <br /> , <br />' 3.0. PROCEDURES <br /> 3 1 MONITORING WELL PURGE PROCEDURES <br /> On 31 March 1995, the water level in each monitoring well was measured relative to the top of the <br /> casing using a Solinst water level meter After water levels were measured, a clean PVC bailer was <br /> rused to surge and purge each well Five to six gallons (minimum three well volumes) of water were <br /> removed from each well until temperature, pH and conductivity had stabilized (Appendix A) <br /> Stabilization parameters were measured at one-gallon intervals using an ICM water analyzer Purged <br /> water was stored on-site in 55-gallon DOT drums <br /> t S <br /> 3 2 COLLECTION OF GROUND WATER SAMPLES <br /> Water samples were collected from each well using a new disposable plastic bailer Each water <br /> sample was collected in two 40-m1 VOA vials and one 1-liter amber bottle After collection, the <br /> samples were placed in a chilled container and transported under chain-of-custody procedures to <br /> McCampbell Analytical, Inc (MAI) in Pacheco, California Each sample was analyzed for total <br /> petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d), volatile aromatics <br /> (benzene, toluene, ethyl benzene and xylenes BTE&X) in accordance with EPA'methods <br /> 5030/8015m and 602, respectively <br /> 4.0. FINDINGS <br /> 4 1 GROUNDWATER GRADIENT AND DIRECTION <br /> The relative elevation o ground and water in each well was calculated by subtracting the depth-to-water <br /> from the surveyed relative casing elevation(Table 1) All wells were surveyed relative to MW-I The <br /> relative ground water elevation ranges from 12 05 feet in MW-3 to 11 55 feet in MW-4 The water <br /> elevation rose an average of 0 45 feet at the site compared to data the December 1994 monitoring <br /> 10 event <br />