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Mr. Ross Atkinson <br /> March 30, 2001 <br /> Page 5 <br /> Upon collection, the sample will be prepared for shipment to a California state-certified <br /> laboratory and labeled as described below. Samples will be placed in a sealable plastic <br /> bag and placed on ice in a cooler pending transportation to the laboratory. Observations <br /> of the sample and sample area will be documented within a field notebook. <br /> The probe hole will then be backfilled with a bentonite-cement grout. <br /> Analyses. Groundwater grab samples will be analyzed for the following suite of <br /> parameters: <br /> • Total and dissolved chromium using EPA Test Method 6010. <br /> ■ Total and dissolved Chromium VI using EPA Test Method 7199. <br /> Filtration of samples for dissolved metals will be conducted by the laboratory. Because <br /> chromium VI has a 24-hour laboratory holding time, samples will be collected in a <br /> manner to meet overnight shipment to the laboratory. Sampling will not be conducted <br /> on a Friday to avoid sample receipt at the laboratory on the weekend. <br /> Field Quality Assurance/Quality Control (QA/QC) Samples. During this <br /> investigation additional samples will be collected in the field as QA/QC samples and will <br /> include the following: <br /> Field Duplicates. Field duplicates will be taken at a frequency of one duplicate <br /> sample per ten field samples. One duplicate will be collected if the number of <br /> samples is less than ten,with at least one duplicate collected at each facility. <br /> Field equipment blanks:One field equipment blank will be collected for each <br /> day of sampling using non-disposable sampling equipment (direct push <br /> groundwater collection tool). Equipment blanks will not be collected from <br /> disposable sampling equipment. <br /> Equipment Decontamination and Waste Containment. Non-disposable sampling <br /> equipment will be decontaminated between samples by the following three-stage <br /> decontamination process: <br /> • Washing with a non-phosphate detergent, <br /> • Rinsing in tap water, and <br /> • Rinsing again in distilled water. <br /> Direct push drilling equipment will be decontaminated by high-pressure wash, as need, <br /> and between facilities. Decontamination fluids will be stored at each facility in <br /> DOT-approved 55-gallon steel drums. The drums will be labeled with the generator <br /> name, site address, description of the contents, and generation date. <br /> 1''\wp\jobs\20587\102253 Groundwatrr%Rdoc <br />