ARCHIVED REPORTS_XR0003131 - Laserfiche WebLink

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4F ry 1 Whenever possible, groundwater parameters pH, temperature (,n degrees Celsius [C]), specific conductance (in micromhos per centimeters squared jumhos)), and turbidity (in National Turbidity Units [NTU]) will be monitored and recorded on the Groundwater Sampling Form • If a well is purged dry before three casing volumes have been removed, the sample will be taken after the well has recovered to at least 80 percent of the static water level prior to purging or after 4 hours when sufficient water volume is available to meet analytical requirements, whichever comes first Reasonable efforts will be made to avoid dewatering wells by using low-yield pumps as necessary • Water samples will be collected with a stainless steel or Teflon bailer To reduce potential cross contamination, sampling should take place in order from least to most contaminated wells Bailer strings should be replaced between each well to avoid cross contamination from a bailer string which has absorbed contamination • Sample containers will be filled directly from the bailer • Use only sample containers prepared and provided by an analytical laboratory Preservatives are required for some types of samples Sample containers containing preservatives should be supplied by an analytical laboratory • For volatile organics analysis, each sample vial will be filled with sample water so that water stands above the lip of the vial The cap should then be quickly placed on the vial and tightened securely The vial should then be checked to ensure that no air bubbles are present prior to labeling the sample • Take site blank samples (trip and rinsate) using distilied water or laboratory supplied water from a known uncontaminated source One trip blank and one rinsate blank sample for each site will be analyzed for each site sampling event • Once collected and labeled, all samples will be stored in a cooler maintained at 4 degrees Celsius using frozen water ice Sample Custody Procedures Sample custody procedures will be followed through sample collection, transfer, analysis and ultimate disposal The purpose of these procedures is to assure that the integrity of samples is maintained during their collection and transfer Sample quantities, types and locations will be determined before the actual field work begins As few people as possible will handle samples The field sampler is personally responsible for the care and custody of the collected samples until they are properly transferred Each sample will be labeled and sealed properly immediately after collection Sample identification documents will be carefully prepared so that identification and chain-of-custody records can be maintained and sample disposition can be controlled Forms will be tilled out with waterproof ink The following are sample identification documents that will be utilized during the field operations iP 1GWMPIFORMSITEX-SOP DOC Page 3 of 5