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Geosyntec'� <br /> consultants <br /> 3.2.4.3 Chain-of-Custody Procedures <br /> Chain-of-custody (COC) procedures will be followed for all samples throughout the <br /> collection, handling, and analysis process. Samples are considered to be in one's custody <br /> if within the custodian's possession or view, in a secured location with restricted access, <br /> or in a container that is secured with an official seal such that the sample cannot be <br /> accessed without breaking the seal. <br /> The principal document used to track possession and transfer of samples will be the COC <br /> form. Each sample will be entered on a COC form the day it is collected. All data entries <br /> will be made using an indelible-ink pen. Corrections will be made by drawing a single <br /> line through the error, writing in the correct information, then dating and initialing the <br /> change. <br /> A COC form will accompany each cooler of samples to the analytical laboratory. Each <br /> person who has custody of the samples will sign the COC form and ensure that the <br /> samples are not left unattended unless properly secured. Copies of all COC forms will be <br /> retained in the project files and included in an appendix to the final report. <br /> 3.2.5 Equipment Decontamination Procedures <br /> All down-hole drilling, augering, and/or sampling equipment will be decontaminated <br /> after arrival on-site and after use in each boring. The equipment will be thoroughly <br /> cleaned before it is removed from the site at the end of field sampling. <br /> The following general decontamination procedures will be followed for all field <br /> equipment: <br /> • Perform a pre-wash rinse with tap or site water; <br /> • Wash with a solution of tap or site water and phosphate-free soap (e.g., <br /> Alconox®); <br /> • Rinse three times with distilled water; and <br /> • Store in a clean closed container for next use. <br /> 20190122- FINAL UST Data Gap Work Plan 10 22.01.2019 <br />