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Equipment Blank <br /> An equipment rinsate blank will be collected during the sampling activities by running laboratory- <br /> grade deionized water or distilled water through or over the cleaned sampling equipment. The <br /> collected water will be placed in appropriate containers and properly preserved. The analysis of the <br /> equipment blank will provide an indication of contamination from field procedures. <br /> Field Duplicates(soil) <br /> Field duplicates will be collected at a frequency of one duplicate every 20 primary soil samples. <br /> These samples will evaluate analytical precision (reproducibility). The field duplicates will be <br /> provided with a sample number that differs from the primary sample number to prevent the <br /> laboratory from recognizing the sample as a duplicate. The analysis will be the same as the primary <br /> sample. <br /> Trip Blank <br /> A trip blank prepared by the laboratory will accompany samples from the time collected until <br /> delivered to the laboratory. The results will determine if the samples were contaminated during <br /> transport from the field to the laboratory. <br /> 3.5.6 Sample Custody <br /> Samples will be collected, transported, and received under the chain-of-custody protocols consistent <br /> with procedures established by the EPA for litigation-related materials. Each transfer of possession <br /> will be logged on the chain-of-custody form. Signature of relinquisher and recipient will be required. <br /> A copy of the chain-of-custody form will be produced and filed by GRI whenever samples will be <br /> sent to the laboratory. Upon receipt at the laboratory, the laboratory custody procedure will provide <br /> the mechanism through which the disposition and custody of the samples will be accurately <br /> documented during each phase of the analytical process. A sample receipt checklist will be used to <br /> document the condition of samples on arrival at the laboratory. <br /> 3.5.7 Background Samples <br /> Four background samples will be collected and analyzed for metals. The results will be compared to <br /> the primary site samples (including previous samples) to determine if the concentrations on-site are <br /> representative of background concentrations or indicate impact from site activities. The background <br /> samples will be analyzed for Title 22 Metals. <br /> 3.6 Field Measurements <br /> 3.6.1 Equipment Calibration and Quality Control <br /> Field measuring equipment will be calibrated per the specifications of the manufacturer and at least <br /> once prior to the planned activities. GRI will maintain a calibration log and have it available for <br /> viewing upon request. <br /> 1163-3 2014 0617 PEAWP 3 11 GRI <br />