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` • • A-3 inch-long split-spoon sampler lined with three 6-inch-long thin-walled brass tubes The sampler will be driven its entire length into undisturbed soil, either hydraulically or by a 140-pound drop hammer When the sampler is extracted from the borehole, the brass tubes will be removed and the ends of the tubes will immediately be screened for the presence of hydrocarbons with a PID or equivalent instrument One sample per 5-foot sampling interval will be selected for possible chemical analysis on the basis of the highest PID reading The ends of the selected brass tube will be (1) covered with aluminum foil and plastic caps, which will then be taped with plastic tape to provide an air-tight seal, (2) labeled and placed into zip-lock plastic bags, and (3) stored in a cooled ice chest for delivery to the analytical laboratory These procedures minimize the potential for cross contamination and volatilization of volatile organic compounds prior to chemical analysis To prevent cross contamination during sampling, all equipment will be washed with laboratory- grade detergent, rinsed with tap water, and rinsed with deionized water before and between collecting each sample SAMPLING FROM STOCKPILES AND EXCAVATIONS Soil samples from stockpiles are composites, collected at a rate of one composite sample for every 100 cubic yards of soil The composite sample consists of about three, and not more than four, individual soil samples of approximately equal volume The individual soil samples will be collected using a decontaminated stainless steel trowel or an impact sampler The soils will be packed into a 2-inch by 6-inch brass tube, and the ends of the tube will be covered with aluminum foil and plastic end caps The end caps will be taped in place with duct or plastic electrical tape The individual soil samples comprising the composite soil sample will be homogenized at the analytical laboratory All samples will be labeled and handled as described in the Brown and Caldwell operating procedure entitled Sample Handling GROUNDWATER SAMPLING Prior to collecting a sample of groundwater from a well, the well will be purged by removing three or more well volumes of water, using either a pump or a bailer A well volume is defined as the amount of groundwater in the well casing The pH and electrical conductivity of the water will be measured periodically during the purging Use or disclosure of data continued on this sheet is subject to the restriction specified at the beginning of this document MEL\GEN\6271\WRKPLN DOC