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Groundwater Quality Sampling Plan <br /> need to be sealed inside a gallon-size ZiplocTm bag and placed in the cooler for <br /> shipment. If the sample cooler is shipped for overnight delivery, the cooler will be sealed <br /> with shipping tape and a signed COC seal, provided by the laboratory, will be affixed to <br /> the outside of the cooler. <br /> Sampling schedules and deliveries or shipments to the laboratory will be coordinated <br /> such that every attempt will be made to meet the recommended holding times of the <br /> analyses. Laboratory analyses performed outside the recommended holding times will <br /> be flagged or qualified appropriately in the report of analyses provided by the laboratory. <br /> 4.5 Chain-of-Custody of Samples <br /> EPA-accepted chain-of-custody (COC) procedures will be followed to maintain the <br /> validity of the groundwater samples being delivered to the laboratory. From the time the <br /> empty sample containers leave the laboratory until the issuing of the laboratory results, <br /> the samples and/or sample containers will be: 1) in sight of the assigned custodian, or <br /> 2) locked in a tamper proof location, or 3) sealed with a tamper proof seal. A written <br /> record of sample container possession and transference of samples will be documented <br /> on appropriate COC forms. The forms will also be used as a mechanism of <br /> communication between the sampling personnel and the analytical laboratory to note <br /> any specific details or requirements regarding the requested laboratory analysis. At the <br /> completion of the sampling event, a copy of the completed COC form, signed by all the <br /> appropriate entities handling the samples, will be retained with the laboratory report. <br /> 4.6 Quality Assurance and Quality Control <br /> Quality assurance (QA) and quality control (QC) procedures will be followed so that <br /> laboratory preparation, field sampling, and transport activities do not bias the results of <br /> the chemical analysis. QA/QC samples are collected to provide a quantitative basis for <br /> evaluating the analytical results. Typical QA/QC samples collected for groundwater <br /> sampling programs may include one or more of the following: <br /> Duplicate Sample - Duplicate samples are collected by the sampling personnel <br /> in a manner identical to the primary sample. The duplicate sample will be <br /> analyzed by the laboratory just as the primary sample is analyzed. The duplicate <br /> is intended to verify that the results from the primary sample are accurate and <br /> reproducible. <br /> Trip Blank - A trip blank consists of an analyte-free water sample prepared by <br /> the laboratory. The trip blank will accompany the sample container shipment from <br /> the laboratory to the field and back. At no time will the trip blank container(s) be <br /> opened in the field. Trip blanks will be analyzed by the laboratory only for volatile <br /> organic compounds. <br /> FgAlMOLEN LG Everist Sampling Plan <br /> &ASSOCIATES Page 8 of 10 <br />