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\~ I ~~'I I l { 'f~ ~.,, is ii_.~ j(1 ~ C~,u.iN,: ~.~, ~• ~ l ~ ~- ~ J ~'~1,'.<<;. 1. Pursuant to Section 783.14, maps should be provided of the regional and site surface geology, strucCUral contour of the Cop of the coal seam showing faults and outcrops, and :ui overburden map. 2. Copies sbould be provided of reports on noise levels at the Orchard Valley (line [hat wore forwarded to Llic Isurenu n ,anc~llanagemunC. 3. Pursuant [o tiection 7ri4.12, provide resulCS of percolation CesCs in the treatmcnC pL~nt oxidation pond. Provide water shed topography, and specific calculations for the parl:inp, lo[ sedimentation pond. (taps 21 and 17 do not join due to the lack of scale rni flap 21. 'Che calculations provided in Uie Apprndices are not adequate to evaluate compi.iance of the existing seclimenta[ion ponds with the pcrinanent re};ulatory program. The pertinent calculations should he presented in the text in a logical manner. Adequate data to enable selective checkinJ; by the regulatory authuri.ty should he included. Show relationship between conduit spillways and upper limit of sediment scor:y;c v~d ensure that during dewatering, sediment is no[ washed out. Provide [he results u[ surveying of these ponds (to present) in a Form that facilitates analysis of sediment yields and deliveries. Provide additional information [hat shows why retention of the sedimentation ponds will minimize disturbance to the hydrologic balance. 4. Pursuant to Section 783.25, provide a map showing the location of existing wells in the area. 5. On map lA of Volume V, there are three blocks in the southwestern corner of Section 24, and one block in the central part oP Section 31 immediately east of Colorado 187 [hat are missing owner designation, please provide. 6. The answer given Sn response to the following question: "'fhe application contains what could become a misleading sentence on page 13: "i.n contrast, most streams in the LJes[ern United Sates coal areas are ephemeral and would not qualify (as alluvial valley floors)." Some streams that are ephemeral may be alluvial valley floors." Is not satisfactory, even if the quote is from the lJestcentral Colorado. Regional GIS, it is misleading. Tlie Regional I:IS was prepared before the definition of alluvial valley floors and their identification was finalized. 7. The idlJl/4 and SIJI/4 of the Section 18 and SIJI/4 of Section 7 R911J, T135 '~ needs to he intensively inventoried for cultural resources. It is our understanding from tl~e reports that these areas were only sample surveyed.