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' 08 June 2002 <br /> AGE-NC Project No-98-0433 <br />' Page 3 of 8 <br />' 2 1 4 Equipment Decontamination <br /> All probing rods used were cleaned prior to advancement in each probe boring location The <br /> sampling equipment was washed in an Alconox solution and rinsed with water prior to each <br /> sampling run to avoid cross-contamination <br /> 2 1 5 Borehole Abandonment <br />' At the conclusion of soil boring activities, the boring was permanently sealed to prevent vertical <br /> migration of contaminants Under EHD oversight, the borehole was,backfilled with cement slurry <br /> from the total depth to surface grade <br /> 2 2 QUARTERLY WELL MONITORING PROCEDURES <br /> The quarterly gr ound water monitoring event was perforined on 19 February Y2002, ground water <br /> 10 <br /> monitoring was performed on monitoring wells MW-1 through MW-8 <br /> 2 2 1 Well Monitoring and Evacuation <br /> A Solinst water level meter was used to measure the depth to ground water in eight ground water <br /> monitoring wells relative to the tops of the well casings The ground water elevations and gradient <br /> were determined from this data(Table 1) <br /> After water levels were gauged, a pre-cleaned, dedicated disposable bailer was used to purge each <br /> monitoring well of a minimum of three casing-water volumes (approximately 4 to 5 gallons) of <br /> ground water Temperature, pH, and conductivity were measured at approximately one-gallon <br />' intervals using an Oakton Water Analyzer The field data sheets are included in Appendix B Purged <br /> water was stored on site in 55-gallon drums <br />' 2 2 2 Collection and Analysis of Ground Water Samples <br />' Prior to the collection of ground water samples, the depth to ground water was re-measured in each <br /> well to ensure that a minimum of 80% of the initial water volume had recharged Water samples <br /> were then collected from each well using the pre-dedicated disposable bailer The water was <br /> Itransferred into one 1-liter amber bottle and three chilled 40-m1 volatile organic analysis(VOA)vials <br /> . containing 0 5 ml hydrochloric acid (18%) as a sample preservative <br /> Advanced GeoEnvironmental,Inc <br />