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control of dust and drafts, protection from extreme temperatures, and access to a source of stable power. Laboratories should be designed so that there is adequate separation of functions to ensure that no laboratory activity has an adverse effect on the analyses. The laboratory may require specialized facilities such as a perchloric acid hood or glovebox. Separate space for laboratory operations and appropriate ancillary support should be provided, as needed, for the performance of routine and specialized procedures. As necessary to ensure secure storage and prevent contamination or misidentification, there should be adequate facilities for receipt and storage of samples. The level of custody required and any special requirements for storage such as refrigeration should be described in planning documents. Storage areas for reagents, solvents, standards, and reference materials should be adequate to preserve their identity, concentration, purity, and stability. Adequate facilities should be provided for the collection and storage of all wastes, and these facilities should be operated so as to minimize environ- mental contamination. Waste storage and disposal facilities should comply with applicable federal , state, and local regulations. The location of long-term and short-term storage of laboratory records and the measures to ensure the integrity of the data should be specified. 4.2 EQUIPMENT/INSTRUMENTATION Equipment and instrumentation should meet the requirements and specifica- tions of the specific test methods and other procedures as specified in the QAPjP. The laboratory should maintain an equipment/instrument description list that includes the manufacturer, model number, year of purchase, accessories, and any modifications, updates, or upgrades that have been made. 4.3 OPERATING PROCEDURES The QAPjP should describe or make reference to all laboratory activities that may affect data quality. For routinely performed activities, SOPs are often prepared to ensure consistency and to save time and effort in preparing QAPjPs. Any deviation from an established procedure during a data collection activity should be documented. It is recommended that procedures be available for the indicated activities, and include, at a minimum, the information described below. ONE - 15 Revision 1 July 1992