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i <br />T <br />/, <br />~~~ f <br />~" <br />tilAil nl' rf>I •)~, Alrn un ncoii.l~ ir.~p) III IIIIII III IIII III <br />DFI'ARTMENT OF NAIUN AI NrSUIIRf~ <br />U. Mnnle Patcor., E. crulrvc U~n•c vr. 999 <br />2 <br />423 Centennial BuJding. 13135herman Strrel <br />Denver, Colorado 80203 Tel. (30J) 839-3567 <br />David C. 1 It j <br />Director <br />July 22, 19R1 <br />Mr. Ilenry Barbe <br />Dorchester Coal Company <br />2995 Skyline Court <br />Grand Junction, Colorado 81501 <br />Re: Responses to Your Concerns over .Sediment .Storage Volume <br />Dorchester No. 1 and Fru.i.ta flo. 1 and No. 2 11inr_s <br />Our File No. C-014-81 and C-015-81 <br />- Dear Mr. Barbe: <br />In response to our telephone conversation, I rrouid .Iika to explain the <br />Division's position on.determining the pond sediment stnrayr_ volurm: <br />Section 9.05.6(3) (h) of the Regulations of the C'o7ornrl_o ~riinorl band P.eclamatron <br />Board for Coal Mininq requires that all sedimr`ntatinn ponds provide for a <br />minimum sediment storaryc vat ume and periodic sodim^nt removal. True, the <br />Language in our regulations i.s vaque, but the intent way to all ow the Dr: vision <br />to set a policy on sediment storage that would be flexible to the individual <br />operation. <br />The OSM Permanent Regulatory Program (44 F.R. ldo. S0, Tuesday, March 13, 1979, <br />15426-15927) required under Section 816.4G(b) that the sedirrlrnt storage <br />volume he equal to the accumulated sediment volunrc~ from the drainage area <br />to the pond Eor a minimum of 3 years, The voL my I~:ns r.o }~~ rletcrmin~d using <br />the Universal Soil Loss Bquati on, gullr`y erosion rato' earl the scrlimcnt <br />delivery ratio converted to sediment volume. 'fhn only nltr'rnativc was to <br />calculate the sediment storage volume baser] on n J ac m-foot store?^ For ouch <br />acre of disturhance (.Section 817.46(b)(2)). .Sediment Iran to he remover] at <br />the~60~ sediment storage level. <br />Similarly, the OSM Federal Interim Program (42 F.R. No. 239, Tuesday, <br />December 13, 1977, fi26RC,) required under Sect.ior) 715. 17 (e) that sedimr:nt storage <br />volume must be equal to 0.2 acre-feet stnrnge far rnch ~)cr~ of gistnrhrvl <br />area. Sediment real to be mmovcd at the 80~ :x'rlrmcvrt stern yr' ]Duel. <br />The Di viS ion.'s police on ~.."li mr,nt sMrngr` vnlurm~ r•: •.imi lnr ro n:af re;lu)ntinn.;, <br />but is somewhat mom fl cxi bJc thin OSf~i. Unrlr'r Ff 1.PD p•,licy, [Ar' nper ator has <br />several options available: <br />