Laserfiche WebLink
• constructed to last forever (Ruk ~.09.3(i ji The regula[ions also speak to <br />temporary diversions needing sizing fora 2-year ?~-hour s[otzrt (Rule 4.05.312)). <br />Rule -4.0.3(3) Qoes on [o say that fills should be protected by pet~rtanen[ ditches <br />sized to handle the 10-year recurrent interval. or a larger event as specified by the <br />Division for Qood cause shown. Operations at R1 and P3 will be finished within <br />ten years. and it seems reasonable to construct diversions at a size appropriate to <br />the duration of the s[ructure and the relative risk of experiencing such an event. <br />To that end. LCC proposes [o design the ditches fur the P1P3 temporary <br />overburden stockpile fora 25-year 24-hour storm even[, but to leave the ditches at <br />R1 and P3 as 10-year structures. <br />h. Ditch 8E has been added to Table 15-13A. <br />CCWDS-C and CCWDS-D are also on Table 15-13A. Fieure ESC. 15-13A and <br />runs for D8E, D12. D13. C4, and CS have been added. <br />j. The second page of the Lorenci[o Access Road Summary from Exhibit 14 was not <br />provided in the last submit[al. The full table is attached and includes infornation <br />on culvert LAR 187+17. <br />P3 Portal pond and fill pond designs <br />• a. Pond 006 will be re-run to move more water inro the west end of the pond. <br />b. Ex. 15-14 will be revised to reflect the accurate volume and construction designs <br />for Pond 006. <br />Fill 9 pond designs <br />a. LCC acknowledges [he Division's concerns and will attempt to address [hem during <br />construction and preparation of the As-Built. Disturbance in this area is proposed, <br />but is not likely according to the coal information available at this time. and given <br />that the designs meet the minimum requirements. LCC is refraitung from doing any <br />additional work at this time. <br />As previously discussed. foundation conditions fur the pond will be im estigated. likzh a8er <br />a conditional permit approval for the applicant to beein construction of haul roads [o access <br />areas for pond foundation investigation. Thus, the applicant's response at this time is <br />^~~ inadequate but will likely be resohed through the stipulation process. <br />"' <br />Response <br />~J~~ <br />• Investigations for dte surface mine sedimentation ponds will he conducted following permit <br />issuance. CTUThompson has provided a methodolosv for the ~ISHA pond foundation <br />14 <br />