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T ~ <br /> .l <br /> 10 October 2005 <br /> . AGE-NC Project No 04-1168 <br />' Page 3 of 7 <br /> model 17H 55-gallon drums and stored on-site in an area lacking public access Field sheets and data <br /> Iare included in Appendix C <br />' 2 1 5 Well Head Survey <br />' On 04 August 2005, a California state-licensed surveying engineer from Baumbach&Piazza, Inc <br /> Civil Engineers & Land Surveyors surveyed the location and elevation of monitoring wells MW-1 <br /> through MW-3,the global positioning system(GPS) location was surveyed to the nearest 0 07-foot <br />' relative to coordinate datum NAD 83, and the elevation at the top of the well casing was surveyed <br /> to the nearest 0 1-foot relative to publicly available datum COS BM#64 utilizing conventional <br /> differential leveling The elevations of wells MW-1 through MW-3 were determined to be 24 74, <br />' 23 86 and 24 77 feet above mean sea level (MSL), respectively The results of the monitoring well <br /> survey are recorded in Table 1 The surveying report (Morrow Surveying) is presented in <br /> Appendix D <br /> I <br /> 2 16 Equipment Decontamination <br />' • All augers used were cleaned prior to advancement in each boring location The sampling equipment <br /> was washed in an Alconox solution and triple rinsed with water prior to each sampling run to avoid <br />' cross-contamination <br />' 22 QUARTERLY WELL MONITORING PROCEDURES <br />' The initial quarterly ground water monitoring event was performed on 05 August 2005,ground water <br /> monitoring was performed on monitoring wells MW-1 through MW-3 <br />' 2 2 1 Well Monitoring and Evacuation <br />' The depth to ground water in each monitoring well was measured from the top of the well casing to <br /> the nearest 0 01-foot utilizing a Solinst water level meter Ground water elevation in each well was <br /> calculated by subtracting the measured depth to ground water from the surveyed casing elevation <br />' (Table 1) <br /> After water levels were measured,between 6 and 6 5 gallons of water(a minimum of 3 casing-water <br />' volumes per well)were purged from monitoring wells MW-1 through MW-3 using a Waterra inertia <br /> pump with dedicated tubing in each well Ground water temperature, pH, and conductivity were <br /> Advanced GeoEnwronmental,Inc <br /> 1 <br />