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r <br /> National Turbidity Units [NYU]) will be monitored and recorded on the Groundwater <br /> Sampling Form <br /> • If a well is purged dry before three casing volumes have been removed, the sample will <br /> be taken after the well has recovered to at least 80 percent of the static water level prior <br /> to purging or after 4 hours when sufficient water volume is available to meet analytical <br /> requirements, whichever comes first Reasonable efforts will be made to avoid <br /> dewatering wells by using low-yield pumps as necessary <br /> • Water samples will be collected with a stainless steel or Teflon bailer To reduce <br /> potential cross contamination, sampling should take place in order from least to most <br /> contaminated wells Bauer strings should be replaced between each well to avoid cross <br /> contamination from a bailer string which has absorbed contamination <br /> • Sample containers will be filled directly from the bailer <br /> • Use only sample containers prepared and provided by an analytical laboratory <br /> Preservatives are required for some types of samples Sample containers containing <br /> preservatives should be supplied by an analytical laboratory <br /> • For volatile organics analysis, each sample vial will be filled with sample water so that <br /> water stands above the lip of the vial The cap should then be quickly placed on the vial <br /> and tightened securely The vial should then be checked to ensure that no air bubbles <br /> are present pnor to labeling the sample <br /> • Take site blank samples (trip and rinsate) using distilled water or laboratory supplied <br /> water from a known uncontaminated source One trip blank and one rinsate blank <br />. sample for each site will be analyzed for each site sampling event <br /> • Once collected and labeled, all samples will be stored in a cooler maintained at 4 <br /> degrees Celsius using frozen water ice <br /> Sample Custody Procedures <br /> Sample custody procedures will be followed through sample collection, transfer, analysis and ultimate <br /> disposal The purpose of these procedures is to assure that the integrity of samples is maintained during <br /> their collection and transfer Sample quantities, types and locations will be determined before the actual <br /> field work begins As few people as possible will handle samples The field sampler is personally <br /> responsible for the care and custody of the collected samples until they are properly transferred <br /> Each sample will be labeled and sealed properly immediately after collection Sample identification <br /> documents will be carefully prepared so that identification and chain-of-custody records can be <br /> �..maintained and sample disposition can be controlled Forms will be filled out with waterproof ink The <br /> following are sample identification documents that will be utilized dunng the field operations <br /> • Sample Identification Label <br /> Chain-of Custody <br /> Page 3 of 5 <br /> P IGWMPIFORMSITEX-SOP DOC <br />