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31 March 2004 <br /> AGE-NC Project No. 06-1156 <br /> Page 8 of 8 <br /> 4.6.3. Sample Withdrawal <br /> Water samples will be collected from the monitoring well using a dedicated Waterra polyethylene <br /> tubing or disposable polyethylene bailer.The tubing,which is dedicated to each individual well and <br /> replaced periodically(usually annually) and bailers,which are disposed of after one use and require <br /> no decontaminating,thereby minimizing cross contamination due to sampling devices. Samples will <br /> be drawn and collected in such a manner that agitation and exposure of the groundwater to the <br /> atmosphere is minimal. Sample containers will be filled using the appropriate disposable sampling <br /> attachment which allows controlled flow out of the bottom of the bailer by lifting up on the check <br /> valve. <br /> 4.6.4. Sample Handling <br /> Ground water samples will be collected into laboratory-supplied containers. Ground water samples <br /> for BTEX,TPH-g, and fuel oxygenates analyses will be collected into 40-m1 VOA vials containing <br /> 0.5 ml of hydrochloric acid as preservative. Following collection the samples will be placed on ice <br /> and kept in a cooler until delivered to the laboratory for analysis. Chain-of-custody protocols will <br /> be used to document sample custody transfer from the field to the analytical laboratory. A chain-of- <br /> custody form will accompany the samples. <br /> 4.7. EQUIPMENT DECONTAMINATION <br /> All sampling tools used for sample collection will be thoroughly washed with a solution of Alconox <br /> and rinsed with clean water prior to each sampling location. All probing rods will be cleaned prior <br /> to advancement at each probe boring location. Hollow-stem augers will be steam-cleaned prior to <br /> each boring. <br /> 4.8. BORING ABANDONMENT <br /> All soil probe borings and soil borings not completed as monitoring wells will be permanently sealed <br /> to prevent vertical migration of potential contaminants. Soil borings shall be abandoned by <br /> backfilling with bentonite or cement-bentonite slurry from the total depth to surface grade utilizing <br /> a tremmie pipe to within 30 feet of surface grade. The SJCEHD will be notified for grout inspection <br /> at least 48 hours prior to conducting grouting procedures. <br /> Advanced GeoEnvironmental,Inc. <br />