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12 December 2005 <br />AGE -NC Project No 03-1055 <br />Page 3 of 6 <br />approved model 17H 55 -gallon drums and stored on-site in an area lacking public access Field <br />sheets and data are included in Appendix C <br />2 1 5 Well Head Survey <br />On 06 September 2005, a California state -licensed surveying engineer from Morrow Surveying Land <br />Surveyors surveyed the location and elevation of monitoring wells MW -5 through MW -10, the <br />global positioning system (GPS) location was surveyed to the nearest 0 07 -foot relative to coordinate <br />datum NAD 83 (1986), and the elevation at the top of the well casing was surveyed to the nearest 0 1 - <br />foot vertical datum NAVD 88 using CORS stations FARB and CNDR The elevations ofwells MW - <br />5 through MW -10 were determined to be 49 11, 49 29, 49 59, 49 53, 49 78 and 50 09 feet above <br />mean sea level (MSL), respectively The results of the monitoring well survey are recorded in Table <br />1 The surveying report (Morrow Surveying) is presented in Appendix D <br />2 16 Equipment Decontamination <br />All augers used were cleaned prior to advancement in each boring location The sampling equipment <br />10 was washed in an Alconox solution and triple rinsed with water prior to each sampling run to avoid <br />cross -contamination <br />2 2 QUARTERLY WELL MONITORING PROCEDURES <br />The third quarterly ground water monitoring event was performed on 31 August 2005, ground water <br />monitoring was performed on monitoring wells MW -5 through MW -10 <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 Solmst 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, approximately 3 to 5 gallons of water (a minimum of 3 casing - <br />water volumes per well) were purged from monitoring wells MW -5 through MW -10 using <br />disposable plastic bailers Groundwater temperature, pH, and conductivity were measured at regular <br />intervals during purging using an Oakton water analyzer Field sheets and data are included in <br />• Appendix C Purged water was stored on-site in properly labeled, 55 -gallon, DOT -approved drums <br />Advanced CeoEnvironmental, Inc <br />