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gradient is altered, or if the road is otherwise upgraded". As such, the Grand Valley Book Cliffs Notice of Intent must be revised to include a discussion as to how Ark Land Company will comply with the applicable requirements of Regulations 4.03.3(1) through 4.03.3(7) pertaining to Light-Use Roads. Please include designs for these roads that reflect compliance with the applicable design criteria of Regulations 4.03.3(1) through 4.03.3(5). As an additional example, portions of the Notice of Intent that pertain to proposed topsoil stripping, salvaging, and redistribution need to be revised to reflect the requirements of Regulation 4.21.4(5) regazding segregation, storage, and redistribution of A, B, and subsoil horizons. Further, portions of the Notice of Intent that pertain to reclamation of coal exploration activities should be revised to reflect the revegetation standards of Regulations 4.21.4(6), (6)(a), and (6)(b) applicable to operations proposing to remove 250 tons or less of coal. 6. Regarding the Performance Standards at Regulation 4.21,4(7) pertaining to diversions of overland flow, please revise the first paragraph on Page 10 of the "Exploration Plan" to include the following sentences: "In accordance with Rule 4.21.4(7) of the Regulations of the Colorado Mined Land Reclamation Boazd for Coal Mining, and with the exception of small and temporary diversions of overland flow of water azound new roads, dri[I pads, and support facilities (such as camps and lay down areas), no ephemeral, intermittent or perennial stream shall be diverted during coal exploration activities. Overland flow of water shall be diverted in a manner that (a) controls erosion; (b) to the extent possible using the best technology currently available, prevents additional contributions of suspended solids to stream flow or runoff outside the exploration azea; and (c) complies with Rule 4.05.3 and all applicable State or Federal requirements." Regazding the Performance Standazds at Regulation 4.21.4(10), please revise the first paragraph on Page 10 of the "Exploration Plan" to include the following sentence: "In accordance with Rule 4.21.4(1) of the Regulations of the Colorado Mined Land Reclamation Boazd for Coal Mining, coal exploration activities will include the use of sediment control measures such as those listed in Rule 4.05.5." Regarding the Performance Standards at Regulation 4.21.4(11), the definition of "acid-forming materials" can be found at Regulation 1.04(2), and the definition of "toxic-forming materials" can be found at Regulation 1.04(139). Please revise the first pazagraph on Page I 1 of the "Exploration Plan" to include the following sentence: "Any toxic- or acid-forming materials that may be encountered during coal exploration and reclamation activities will be handled and disposed of in accordance with Regulations 4.05.8 and 4.14.3 of the Regulations of the Colorado Mined Land Reclamation Boazd for Coal Mining." 9. The Division is conducting its review of the reclamation cost estimate for the activities proposed under this Notice of Intent. We will contact you if we have any questions in this regazd.