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Section 816.116 (b). • (b)(1) Ground cover and productivity of living plants on the revege- tated area within the permit area shall be equal to the ground cover and productivity of living plants on the applied reference area or to the standards in other technical guides approved by the Director for use ir. the regulatory program. The period of extended responsibility under the performance bond requirements of Subchapter J initiates when ground cover equals the approved standard after tY~e last year of augmented seeding, fertilizing, irrigation or other work which ensures success in-- (i) Areas of more than 26.0 inches average annual precipitation; and continues for not less than five years. Ground cover and productivity shall equal the approved standard for the last two consecutive years of the responsibility period; or in (ii) Areas of less than or equal to 26.0 inches average annual precipi- tation; and continues for not less than 10 years. Ground cover and pro- _ ductivity shall equal the approved standard for the last two consecutive years of the responsibility period. (2) For purposes of paragraph (b)(1) of this Section, the average annual preciptation can be determined either-- (i) By interpolation, using standard techniques, from 't9ean Annual ?recipitations', P1ap, p. 97, The National Atlas of the United States, L'. S. Department of the Interior, Geological Survey, 1970; or from 'Climatic Atlas of the United States', U.S. Dept. o` Commerce, National Oceanic and Atmospheric Aamir.istration, 1974; or from long-term precipitation averages from 'Climatological Lata', U.S. Dept, of Commerce, National Oceanic and Atmospheric Administration; or from other official records; or (ii) Eased on 10 years of continuous and reliable precipitation records • mom stations located in or adjacent to the mine plan area. 816-158