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i Sampling and Analysis Chain-of-Custody Record The sampling and analysis chain-of-custody record is initiated at the time of sampling and contains, but is not limited to, the well number, sample type, analytical request, date of sampling, and the name of the sampler. The record sheet is signed, time logged, and dated by the sampler when transferring the samples. Custody transfers are recorded for each individual sample; for example,if samples are split and sent to more than one laboratory, a chain-of-custody record sheet wi11 accompany each sample. The number of custodians in the chain of possession`vill be kept to a minimum. A copy of the sampling and analysis chain-of-custody record is returned to EMCON with the analytical results. Groundwater Sampling and Analysis Request Form p g A groundwater sampling and analysis request form (see Figure A-4) or purchase order, or both, accompanies the samples delivered to each laboratory. These forms serve as official communication to the laboratory of the particular analysis/analyses required for each sample. At minimum, the groundwater sampling and analysis request form includes the following information: • Date submitted • Specific analytical parameters • Well number • Sample source ANALYTICAL METHODS Samples collected as part of the monitoring program are analyzed consistent with accepted analytical procedures. The following publications are the primary references for analytical procedures: • Methods for Chemical Analysis of Water and Wastes, USEPA-600/4-79-020, revised March 1983 • Methods for Organic Chemical Analysis of Municipal and Industrial Wastewater, i USEPA-600/4-82-057,July 1982 • Test Methods for Evaluating Solid Wastes: Physical/Chemical Methods, USEPA SW-846,3rd edition,November 1986 1 NWiscellaneous\Groundwater Info-All Sites\SAP AppendixA.doc A-7