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s 's EXHIBIT A BROWN AND CALDWELL FIELD PROCEDURES FOR SAMPLING FROM STOCKPILES AND SAMPLE HANDLING Sampling from Stockpiles. Soil samples from stockpiles are composites: 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. Sample HandIing. Samples are handled during collection and shipment in such a way as to ensure maximum sample quality and integrity. All samples will be collected by experienced Brown and Caldwell field personnel. The samples will be collected in containers that are appropriate to the sample material and the required analyses. All containers will have been precleaned by the analytical laboratory, the container manufacturer, or will be cleaned in the field by washing in Iaboratory-grade detergent, rinsing with tap water, and then rinsing with deionized water. All sampling equipment will be cleaned in the same manor in which the sample containers are cleaned. Each sample container will have a label affixed in the field that identifies the date and time of sample collection, name of sampler, job number, and a unique sample number. This information will be recorded on the boring log or in the field records. Samples are stored and shipped to the laboratory in a cooled chest. Only analytical laboratories certified by the California Department of Health Services will be used. A chain-of-custody form will be used to record possession of samples from the time of collection to the time of arrival at the laboratory. The sample-control officer at the laboratory will verify sample integrity and confirm that they were collected in the proper containers, preserved correctly, and that there is an adequate volume for analysis. If these conditions are met, the samples will be assigned a unique log number for identification throughout analysis and reporting. The log number will be recorded on the chain-of-custody form and in the log book maintained at the analytical laboratory. The sample description, date received, client's name, and other relevant information will also be recorded. 26401REP0RT512640-01.WP