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PMY <br /> 4.0 Planning <br /> Field QA/QC is generally applicable when a new field procedure is being used, a new piece of equipment is <br /> being used, or if there is a possibility of litigation in the future that will involve the Site. If one of these issues <br /> arise, check the proposal to ensure that field QA/QC was accounted for in the budget. Samples submitted to <br /> a laboratory for QA/QC purposes are treated as if they were regular samples (analysis and billing). <br /> At Sites that do not fall into the above-mentioned categories, field QA/QC should not be performed unless <br /> stated in the work plan, included in the proposal, or requested and/or approved by the client. <br /> 5.0 Procedure <br /> There are two procedures with which field QA/QC can be evaluated: field blanks and equipment blanks. All <br /> field QA/QC samples should be collected in the field with distilled or deionized water. <br /> 5.I Field Blanks <br /> Field blanks are commonly used when it is suspected that samples may become contaminated from ambient <br /> contamination during field work or during transportation to the laboratory (i.e., from car exhaust). The field <br /> blank(s) should be prepared at the Site immediately prior to commencing sampling and near the most <br /> contaminated area of the Site. Field blanks can be analyzed for one or more of the regular analyses that will <br /> be conducted during that site visit. The type and number of field blanks should be confirmed by examining the <br /> scope of work. The field blank samples should be collected by placing distilled or deionized water in the same <br /> vials used for the regular field samples. Upon submitting the samples to the laboratory, include the field blank(s) <br /> on the same chain of custody as the rest of the samples in the lab pack. <br /> As an example, field blanks that will be analyzed for only volatile organic compounds (VOCs) should be <br /> collected by placing distilled or deionized water in a 40-milliliter (ml) vial containing the same preservative as <br /> the other sample vials. <br /> The field blank(s) should remain in the immediate vicinity and under the same conditions as the actual samples <br /> during the performance of field work. <br /> 5.2 Equipment Blanks <br /> Equipment blanks are used to evaluate whether field equipment decontamination procedures are adequate. All <br /> equipment needed during sampling that is reused for more than one sample (i.e., stainless steel bailer, water <br /> level meter, oil/water interface probe, split spoon samplers, submersible pump etc.) should be decontaminated <br /> in accordance with the work plan or with Pinyon SOP-SCREM04. <br /> To determine if the decontamination procedures used are adequate, equipment blanks can be prepared. While <br /> decontaminating a piece of equipment, the final rinse water should be containerized in sample containers <br /> consistent with the other field samples. The equipment blank should remain with the field samples and should <br /> be stored under identical conditions as the field samples. Upon submittal to the laboratory, the equipment <br /> blank should be noted on the chain of custody to instruct the laboratory to analyze the blank. The equipment <br /> blank should be analyzed for the same constituents as the sample obtained prior to decontamination of the <br /> piece of equipment. <br /> Field Sampling QA/QC <br /> December 23, 2022 <br /> Page 2 of 3 <br />