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Od <br /> 09 Mai 2005 <br /> AGENC Project No. 02 091 1 <br /> Page 7 of 7 <br /> 3.61Well Purging <br /> Su sequen#to measurement-Qf depth to water and prior to sampling,each;weU will be purged using <br /> a bailer or submemible pump to ensure tliat.the sample is.representative ofthe surrounding aquifer <br /> ground water.The well wt11 be-' ed until i j_a minimum of three casing volumes is removed from. <br /> the well;and/or 2)the.field-m6asuiv_d ground water parameters have stabilized.-However,ifthe well <br /> is purged dry:prior to reruovng three casing volumes, a ground water`sample will be collected <br /> following 80 percent-i overy of ground-water within the well. , <br /> 3.6.3. Sample Withdrawal <br /> Water samples will be collected-frim the monitoring-well-using.a new, pre-cleaned disposable <br /> p"yF*Iene-bailer.;'These bailers afe disposed of atter:one use and require no decontaminating, <br /> thereby iiii imizmg.cross contamination due to sampling;devices. Samples will b6 drawn-and <br /> collected in such a manner that.agitation-and,exposure of the ground water to:the atmosphere is <br /> -mintimaL Sample eo ,will be filled using-the app ropr ate-disposable sampling.attachment <br /> which allows controlled.flow out cid the bottom of the bailer by lifting the check valve. <br /> 3.6.4.: Sample`Handli ig <br /> Ground water samples will be collected int©laboratory-supplied-containers.Ground water samples_ <br /> for 'IVH.g, TPH4- TPH-mo,.:BTF:X,.methanol, PDB and fuel;oxygenated <br /> compounds (l1fiI`K -ETBE, TAME, DIPE..and TBA) ll"be collected into,:40-m1 VOA vials <br /> containing 0.5 ml "hydxo t c aeYd as:preserwative �to Miter amber bottles without sample <br /> preservative.Following colleetion;the safmples:will be appropriately'iabeled and placed on ice and <br /> kept in a cooler until delivered to tli@ laboratory for eriralysis' Bain-of-custody protocols will be used <br /> to;document sample castody trans for from the field to the.analytical laboratory.Achain-of-custody ' <br /> form will.accompany the.samples. <br /> At*aw d eeoEavimnm utas,ice: <br />