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V SWW • The percent of soil recovered from a sampling depth interval, and • The notable changes in soil types. Lithologic changes that may result in higher soil organic content and/or fine grained soils will be of particular importance in the selec- tion process, because these characteristics have a direct affect on soil mobility and retention of DBCP. The specific analyses to be performed by the laboratory will include: DBCP, total organic carbon (TQC), mois- ture content, and grain size distribution. Stainless steel sample tubes selected for laboratory analysis will be sealed with Teflon tape and end caps. A label will be affixed to the stainless steel or brass tube, and the tube will be placed into a Ziplo& plastic bag. The information to be included on the label is described later in this section in the Sample Designation and Custody discussion. A field technician will decontaminate nondisposable sampling equip- ment before use and between each sampling. The following field cleaning procedures will be followed: • Either steam clean or wash with Aiconox detergent. • Rinse with tap water. • Rinse three times with deionized carbon-free water. The samples will immediately be put on ice inside a cooler. Field doc- umentation will consist of field activity logs and Chain of Custody and Sample Identification Record forms. All entries onto the various forms will be in water-resistant ink. Drill cuttings will be drummed as drilling progresses. When drilling is completed, drilling cuttings will be dumped on the ground and spread over the site. 2.2 SAMPLE DESIGNATION AND CUSTODY Proper sample container usage, sample labeling, and sample documen- tation is required to ensure proper collection, storage and transfer of representative samples. To this end, analytical laboratories will not accept samples without a correctly-prepared Chain of Custody and Sample Identification Record form. A soil sample is considered "in custody" if: 2-2