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O � 28 April 2006 AGE-NC Project No 04-1214 Page 3 of 5 container and transported under chain of custody to the previously reported laboratories April 6,2006 Sampling Event The quarterly ground water monitoring of wells MW-101 through MW-104 and MW-5 was conducted on 06 April 2006 Prior to purging, depth-to-water measurements were obtained from each well using a Solinst water level meter Each well was then purged of approximately 5 to 8 gallons or three casing volumes using a dedicated Waterra inertial pump equipped with 5/s-inch diameter polyethylene tubing and a check valve The purged water was monitored for temperature, pH, and conductivity at regular intervals during purging using an Oakton water analyzer Purged ground water was containerized in properly labeled DOT-approved 55-gallon drums and stored on-site Field sheets and data are included in Appendix B,/Following purging, samples were collected using a dedicated Waterra inertial pump after allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume and placed into 500m1 plastic,unpreserved containers, labeled, stored in a chilled container, and transported under chain of custody to MAI Each sample was analyzed for Ammonia as Nitrogen by method SM4500, Nitrate as Nitrogen and Nitrite as Nitrogen, by method 300 1, and pH, by method SM4500 A summary of the depth-to-water and groundwater elevation data are presented in Table 1 . 3.0. FINDINGS 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION vY4 G G/g/� , Depths to ground water during the April 2006 monitoring event ranged from 20 95 feet(MW-I Off) to 24 55 feet(MW-101)below the tops of the well casingshe calculated groundwater elevations ranged from 36 07 feet (MW-104) to 38 86 feet (MW-1A above MSL The ground water flow direction was inferred to be west to southwest, at a ground water gradient of 0 0007 foot/foot(ft/ft) northwest of well MW-101 The groundwater flow direction and gradient are depicted in Figure 3 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES The results of analysis for nitrate (NOA nitnte (NO2), ammonia (NH3) and pH are summarized below and in Table 2 10 February 2006 Samples from this event were submitted to both CTEL and MAI for analysis CTEL reported nitrate as non-detect in all samples (<0 2 mg/1 nitrogen) MAI reported nitrate in all but one sample t analyzed, at concentrations betweens2 mg/l (MW-6 located on the Jimco Truck facility) and,2-l-2 • 6A Advanced GcoEnvironmental,Inc