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4.5.2 Packaging and Shipping <br /> Immediately after sample labeling, groundwater sample containers will be bagged in re-sealable plastic bags <br /> to protect the samples from moisture and to prevent breakage and potential cross-contamination during <br /> transportation to the laboratory.All glass sample containers will be protected with laboratory supplied bubble <br /> wrap or similar. Groundwater samples will then be placed on ice in a laboratory supplied cooler. <br /> Each cooler will be shipped with a temperature blank and trip blank. A temperature blank is a vial filled with <br /> tap water and stored in the cooler during sample collection and transportation. The temperature of the cooler <br /> will be recorded by the laboratory on the chain of custody record immediately upon receipt of the samples. A <br /> trip blank is a set of VOAs filled by the lab with distilled water to determine if cross contamination has occurred <br /> during the transportation process. <br /> Upon completion of vapor sample collection, the Summa canister valve will be closed, the final vacuum <br /> reading will be recorded, and the brass cap replaced. Each canister sample tag will be filled out with the <br /> sample identification number and the date of collection. All Summa canisters will be returned to the shipping <br /> boxes provided by the laboratory. <br /> All samples collected as part of this data gap investigation will be either picked up by a courier, hand delivered <br /> by a Roux employee, or shipped via a reputable shipping provider such as FedEx to the appropriate <br /> laboratory under chain of custody protocols. <br /> 4.6 Field Quality Control <br /> To document the quality of the data being collected, several control checks for both laboratory and field data <br /> will be performed. The following identifies the field quality control samples to be collected as part of this <br /> investigation: <br /> 4.6.1 Field Duplicates <br /> Field duplicate samples will be collected to check for sampling and analytical reproducibility. The general <br /> level of QC effort will be one field duplicate collected for every 10 investigative samples. Duplicate samples <br /> will be collected, numbered, packaged, and sealed in the manner as the primary samples laid out in the <br /> sample collection procedures described above.Any duplicate sample will be submitted blind to the laboratory. <br /> 4.6.2 Blank Samples <br /> Blank samples will be collected to check for possible cross-contamination during sample collection, shipment, <br /> and in the laboratory. Equipment blanks and trip blanks will be prepared and analyzed to determine the data <br /> quality provided by the sampling and analysis activities conducted during the execution of this Work Plan. <br /> Field blanks are used to document that contamination is not introduced during sample collection. One field <br /> blank sample will be collected during collection of groundwater samples. <br /> Trip blanks are used to assess the potential for contamination during sample storage and shipment. The trip <br /> blank consists of laboratory provided blank water and will be provided with the sample containers to be used <br /> when sampling for VOCs. Trip blanks will remain inside the coolers and will be included with each shipment <br /> containing project samples to be analyzed for VOCs. <br /> 3989.0001S101/R Revised Data Gap Investigation Work Plan I ROUX 111 <br />