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Parameter Requirement Frequency Operational Check <br /> Criteria <br /> Three-point calibration Prior to start of NA <br /> sampling event <br /> pH <br /> One-point check Prior to start of ±0.2 pH unit <br /> sampling event <br /> One-point calibration Prior to start of NA <br /> Specific sampling event <br /> Conductance One-point operational Prior to start of ±10%of standard <br /> check sampling event <br /> Temperature NA NA NA <br /> Table 2.Field Equipment Calibration Checks <br /> 4 Sample Identification and Handling Procedures <br /> Samples will be assigned an identifier that corresponds to each well name or surface sample <br /> location. In addition, a unique Project ID will be assigned to each sample group analyzed by the <br /> laboratory (See Section B.2, "Standard Practice for Sample Labeling," in Appendix B for more <br /> details). Laboratory personnel will document the identification number on the Chain of <br /> Custody form. <br /> All sample bottles will be supplied by the contracted laboratory. Sample bottles will be pre- <br /> cleaned to guidelines established by the EPA in Specification and Guidance for Contaminant- <br /> Free Sample Containers. To ensure the integrity of the sample, the sampling lead or designee <br /> is responsible for the care, packaging, and custody of the samples until they are dispatched to <br /> the laboratory. Section B.3, "Standard Practice for Chain of Custody and Physical Security of <br /> Samples," in Appendix B will be implemented to provide a secure sample and document sample <br /> custody. <br /> The sampling lead personnel will be responsible for ensuring that the samples are transferred <br /> to the laboratory in sufficient time for the laboratory to complete extraction/analysis prior to <br /> the expiration of sample holding times. If a commercial carrier sends the packages, receipts <br /> and any other shipping-related documents must be retained as part of the chain of custody <br /> documentation. The laboratory services coordinator will retain carrier and shipping receipts if <br /> they have value associated with the laboratory sample receiving activities. <br /> Chain of custody records document all transfers of sample possession and show that the <br /> samples were in constant custody between collection and analysis. A chain of custody form will <br /> Daub&Associates, Inc. 6 NS LLC 2022 SAP <br />