Laserfiche WebLink
SAMPLING FROM STOCKPILES AND EXCAVATIONS <br /> Soil samples from stockpiles are composites, collected at a rate of one composite sample <br /> for every 100 cubic yards of soil. The composite sample consists of about three, and not more <br /> than four, individual soil samples of approximately equal volume. The individual soil samples <br /> will be collected using a decontaminated stainless steel trowel or an impact sampler. The soils <br /> will be packed into a 2-inch by 6-inch brass tube, and the ends of the tube will be covered with <br /> aluminum foil and plastic end caps. The end caps will be taped in place with duct or plastic <br /> electrical tape. The individual soil samples comprising the composite soil sample will be <br /> homogenized at the analytical laboratory. <br /> Soil samples from excavations will be collected using a decontaminated stainless steel <br /> trowel or an impact sampler. They will be packed individually into 2-inch by 6-inch brass tubes. <br /> The ends of the tubes will be covered with aluminum foil and plastic end caps, and the end caps <br /> will be taped in place with duct or plastic electrical tape. For deep excavations that are not safe <br /> to enter, the soil samples will be collected from the bucket of a backhoe or other excavating <br /> machinery, which has scraped soil from the excavation wall or floor, as directed by the on-site <br /> geologist. <br /> Soil samples from the product-piping trenches of underground storage tanks will be collected <br /> as described above, at a rate of one sample for every 20 feet of pipeline. <br /> Water samples from excavations will be collected by lowering into the cavity a <br /> decontaminated glass jar or bottle at the end of a rope or rod. The water in the glass container <br /> will be slowly poured into 40-milliliter vials to a height that forms a meniscus at the rim of the <br /> vial. The vials will be capped with lids having teflon septa, and they will be inspected to ensure <br /> that no air bubbles remain within. <br /> All samples will be labeled and handled as described in the Brown and Caldwell operating <br /> procedure entitled Sample Handling. <br /> SAMPLE HANDLING <br /> Samples are handled during collection and shipment in such a way as to ensure maximum <br /> sample quality and integrity. All samples will be collected by experienced Brown and Caldwell <br /> field personnel. The samples will be collected in containers that are appropriate to the sample <br /> material and the required analyses. All containers will have been precleaned by the analytical <br /> laboratory or the container manufacturer. All sampling equipment will be decontaminated prior <br /> to and between use by washing in laboratory-grade detergent, rinsing with tap water, and then <br /> rinsing with deionized water. <br /> IMP <br />