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<br />-;i 9 - <br />XIX. Roads (2.05.3(3), 4.03 <br />All of the roads within the permit bo wrdary are desi.yned to meet the haul road perfor- <br />mance~standards of Section 4.03.1. The haul road which connects the permit area to <br />Jackson County Road 23a has been designed to meet the requirements of the BLM Right- <br />of-Way Grant C-23190. The entire haul road system meets all of the specific require- <br />ments of Section 4.03.1, except 9.03.1(9)(vi)(A), dealing with culvert spacing. The <br />alternative culvert spacing was reviewed to determine compliance with Section <br />4.03.1(4)(vi). This section rerluires the Division to make a finding that the alterna- <br />tive~spacing will not result in increased erosion. fJhile the Division makes the <br />finding that the alternative spacing will not result in increased erosion, there has <br />been identified in numerous inspection reports a problem with maintenance of the <br />culverts as installed. For this reason, the Division imposes the following stipulation: <br />WYOMING FUEL COMPANY 47ILL PROVIDE DESIGNS FOR IMPROVED INLET CONFIG URATIOtJS <br />AND/OR INLET STRUCTURES TO ALT. OF THEIR ROAD CULVERTS, WF17CH WILL REDUCE THE <br />TENDENCY FOR THE CULVERT h10UTHS TO BECOME FILLED lJI Tl1 AEDIFIENT AND DEBRIS, <br />WITHIN 90 DAYS~OF PERMIT IS.s UANCE. <br />During the course of the review, culverts at the mine site and along the coal haul <br />road were investigated to insure compliance with design criteria specified in the <br />Regulations. This was done using r7esign charts contained .in the U.S. L~partment of <br />Transportation Federal Highway Administration publication, flydraulic Charts for the <br />Selection of Highway Culverts, Jfydraulic Engineering Circular No. 5, 1965. The avail- <br />able headwater was assumed to extend to the crest of the roadway embankment, which the <br />applicant has specified to be at least one foot (Volume I, page 33). All culverts were <br />found to be capable of passing the peak flow of the 10-year, 24-hour storm event. <br />However, the culvert at the haul road crossing of the North Fork of Bolton Draw will. <br />be capable of passing the 10-year, 29-hour storm peak flow only so long as Di vc rs.i on <br />Ditch E diverts the runoff from 211 acres upstream of the crossing. This will be the <br />case during the entire life of the mining operation. This roadway is a preexisting <br />access to the M6T oil well. Presumably, it meets the design requirements of the BL74, <br />the federal land management agency. The road will continue in place after reclama- <br />tion is completed. The road will be improved to haul road standards as specified <br />in Section 9.03.1 and will continue to meet these standards throughout the mining <br />and reclamation operations at the site. As the culvert installation at the crossing <br />is preexisting, meets the design requirements of the DLM, and will be improved by <br />the applicant, the Division deems it unreasonable to impose the requirements of <br />4.03.1(7)(1) dealing with post-mining retention of roads. <br />XX. Bonding <br />The bonding estirrr~te provided by the applicant of 5921,000 has heen carefully reviewed <br />by the Division and has been found to be appropriate for. the worst-case reclamation <br />cost during the permit term. The worst-case has been shown to be the point at which <br />all of the initial boxcut in Pit 2 has been removed to Pit 1. This is scheduled to <br />occur late in the first quarter of 1982. <br />The 1981 Rental Rate Blue Book for Construction Equipment, ;Jielsen-Dataquest Equipment <br />Guide-Book Division, was used to determine the cost of heavy equipment rental. An <br />area rental rate adjustment of 4%; of the base rate was assumed (see Xerr Coal Company <br />application, Volume 12, Appendix 58, page 2). As the applicant proposes to work two <br />shifts, the area adjusted base rental rate was multiplied by 1.5, as described on <br />