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1 02 February 2004 AGE-NC Protect No 99-0624 _Page 4of8 ' 2 2 QUARTERLY WELL MONITORING PROCEDURES A quarterly ground water monitoring event was performed on 22 September 2003 on ground water ' monitoring wells MW-1 through MW-4, MW-6 and MW-7 ' 2 2 1 Well Monitoring and Evacuation The depth to ground water in the six monitoring wells was measured from the top of each well ' ' casing to the nearest 0 01-foot utilizing a Solinst water level meter Ground water elevation in each well was calculated by subtracting the measured depth to ground water from the surveyed casing elevation (Table 1) ' After water levels were measured approximately 5 0 gallons of water a minimum of 3 casing-water pp Y g ( g volumes per well) were purged from monitoring wells MW-1 through MW-4 and MW-6 and ' approximately 17 50 gallons ofwater were removed from well MW-7 using a Watera hydrolift pump and dedicated tubing Ground water temperature, pH and conductivity were measured at regular ' intervals during purging using an Oakton water analyzer Field sheets and data are included in Appendix D Purged water was stored in properly labeled DOT-approved 55-gallon drums and stored on-site 1 2 2 2 Collection and Analysis of Ground Water Samples ' Water samples were collected from each purged well using a Watera hydrohft pump and dedicated tubing after allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume ' Each water sample was transferred into three 40-m1 VOA vials containing 0 5 ml 18%hydrochloric acid as a sample preservative After collection,the samples were properly labeled,placed in a chilled container and transported under chain-of-custody to CAL for analysis The samples were analyzed ' for • TPH-g in accordance with EPA Method 8015M, ' 6 BTEX and MTBE, in accordance with,EPA Method 8020, and • MTBE, DIPE, ETBE, TAME, TBA, 1,2-DCA and EDB in accordance with EPA Method 8260B Advanced GeoEnviron mental,Inc I