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r • 40 B.3 Disposal Procedures Residual substances generated during cleaning procedures (if any) that are known or suspected to pose a threat to human health or the environment will be placed in appropriate containers until chemical testing has been completed to determine the proper means for their disposal. C. SAMPLE CUSTODY Sample custody procedures will be followed through sample collection, transfer, analysis, and ultimate disposal. The purpose of these procedures is to assure that (1 the integrity of samples is maintained during their collection, transportation, and storage prior to analysis and (2 post-analysis sample material is properly disposed of. Sample custody is divided into field procedures and laboratory procedures, as described below. C.1 Field Custody Procedures Sample quantities, types, and locations will be determined before the actual fieldwork commenced. As few personnel as possible will handle the samples. The field sampler will be personally responsible for the care and custody of the collected samples until they were properly transferred. C.1.1 Field Documentation Each sample will be labeled and sealed properly immediately after collection. Sample identification documents will be carefully prepared so that identification and chain-of-custody records can be maintained and sample disposition can be controlled. Forms will be filled out with waterproof ink. The following sample identification documents will be utilized. Field notebook or soil boring logs Chain-of-custody forms C.1.2 Sample Labels The intact soil and water samples will be labeled with the following information: Name of collector Date and time of collection Place of collection and/or ADR project number Sample number C.1.3 Chain-of-Custody Record A chain-of-custody record will be filled out for and accompanied every sample and every shipment of samples to the analytical laboratories in order to establish the documentation necessary to trace sample possession from the time of collection. The record will contain the following information: Station of sample number or sample I.D. Signature of collector, sampler, or recorder. Date and time of collection. Place of collection. Sample type. Signatures of persons involved in the chain of possession. Inclusive dates of possession.