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:Jo4/3 index data. (6) .-\ scanning density with a miIùmum of 200 dots per inch is required for recording documents that contain nO type font smaller than six point. (ï) A scanning density with a minimum of 300 dots per inch is required for engine€ring drawings, maps, and other documents with background detail. (8) The selected scanning density must be validated with tests on actual documents. (9) The use of the Consultative Committee on International Telegraphy and Telephony (CCnT) Group 3 or Group 4: compression techniques is required for document images without continuous tonal qualities. If use of a proprietary compression technique is unavoidable, the vendor must provide a gateway to either Grou p 3 or Group 4: compression techniques. (10) Optical drive systems must not be operated in environments with high levels of airborne particulates. (11) All aspects of the design and use of the imaging system must be documented, including administrative procedures for digital imaging. retrieval, and storage; technical syster.1 specifications; problems encountered; and measures taken to address them including hardware and software modifications. (h) Smoking. drinking, and eating must be prohibited in electronic media storage areas. §7.77. RETENTION OF ELECTRONIC RECORDS. (a) State agencies and local governments must establish policies and procedures to ensure that electronic records and any software, hardware, and / or documentation, including maintenance documentation, , ~ required to retrieve and read t~e electronic records are retained as long as the approved retention period for the electronic records. (b) The retention procedures must include provisions for: (1) scheduling the disposition of all electronic records, according to statutory requirèments, as well as related software, documentation, and indexes; and (2) establishing procedures for regular recopying, reformatting, and other necessary maintenance to enSure the retention and usability of electronic records until the expiration of their retention periods. (c) State records having archival value and s,cheduled to be preserved at the State Archives must be transferred to the State Archives as the source document, or printed out on alkaline paper for computer generated information, or on microforms that me€t the specifications in America~ National Standard for Imaging Media (Fz7m) - Silver-Gdatil1 Type - Specifications for Stability (ANSI IT9.1-1989 or latest revision). §7.78. DESTRUCTION OF ELECTRONIC RECORDS. (a) Electronic records may be destroyed only in accordance with a records schedule approved by the director and librarian or designe€ or, in lieu of an approved records schedule, an approved records disposition authorization request. (b) Each state agency and local government must ensure that: (1) electronic records scheduled for d estroction are disposed of in a manner that ensures protection of any confidential information; and (2) magnetic storage media previously used for electronic records containing confidential infor- Electronic Records Standards and Procedures 111 ¡ Suppl. p. 5-19.5