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PERMFILE60699
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PERMFILE60699
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Entry Properties
Last modified
8/24/2016 11:07:30 PM
Creation date
11/20/2007 6:49:04 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M2000158
IBM Index Class Name
Permit File
Doc Date
5/18/2001
Doc Name
Riverbank Faxes
From
DMG
To
PLATTE SAND GRAVEL LLC
Media Type
D
Archive
No
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<br />MEMORY TRANSMISSION REPORT <br /> <br />PAGE :001 <br />TIME MIRY-IB-O1 10:14AM <br />TEL NUMBERI: +13038663567 <br />NAME :Colorado Division of Minerals i GeoloeY <br />FILE NUMBER 179 <br />DATE NAY-18 09:51AM <br />TO : 519707652590 <br />DOCUMENT PAGES 006 <br />START TIME NAY-18 10:04AM <br />END TIRE MAY-18 10:14AM <br />SENT PAGES OOfi <br />STATUS OK <br />FILE NUMBER :179 *** SUCCESSFUL TX NOTICE *** <br />STATE OF COLORADO <br />OIVIi)ON OF MINEaALa ANp GEpyQG]' __ -_ _ _-_ _„ <br />O,e/ann.enl of Natural Meae.n<a. <br />1 ] I.l aA.rm.n ae., ncem 3l a <br />pnnvar, Coloratlo e0303 <br />PFOn.: IJ03) aa6-35ar <br />PA%: 1]o]I a]3-0100 <br />May 1 ), 2001 <br />Pen4M1` Fan[ Noln !e!1 osa (p <br />T• cmm ' <br />GoJp.pL Ge. <br />Pnene • • .~jJ <br />M[ N E~ R A G S <br />G E O„ O G Y <br />n ~ni -f AiaTY <br />Roolry Hoffscltneldcr ):: ow_n. <br />Platte Smd dt Ornvci LLC ' <br />P.O. BOX 3 BO o:ew a w.,~,.~ <br />e~ .,.. <br />Linleton, CO 80106 <br />o:-:ar.. ii.:..:.,. <br />liT: Altrcrbad[ and Pit 91opc Armoring Prvpoaal, Technical Rcvlsion <br />m SdkH Mlne Smdon 113 Itaclamatlon Permit Appgeatloo, Plana <br />Vallsy Sand and Graw1, Flle No. M..2000-156 <br />Dear Mr. kioffichnsidcr, <br />Platte Smd g Citavcl LLC ban providsd s technics] revision (TR) to £.•^her addross concern9 wish erosion <br />poundal through the gravel pit mining Della during a Iergs flood wmt. The TA includaa m illustrat:an oT <br />locn[iona that the Applicm[ ban darermined to be sensitive sro with the poimcial Tor oeceaslve erosion. The TR <br />includes a proposal and deafgta to subil[ze retain o{thane pocmtially emaitit.c nroaa by armoring through th¢ <br />pleeemmt of ripsap. The TR also includes cos[ est:masea for the plaoammt o{riprnp and a desr:ription of Ne <br />timing oT riprnp inatnllatian rolntiye co dte sequence o{exeavn[lon in the gravel pies. Tha Division's review of the <br />TR is brohm out into four asctions in thin memormdum e. follows: <br />• The determimdoa of locstlona drat msy be subject [o erosion during a large flood. <br />• The speaifloas:on and drawings chess will gov¢ro she a tag and plaummt of riprop. <br />• Tlas estimated cost to purchase and sslca delivery oT riprop that meeu spcc: reacfon, and to install Na rlprop iaa <br />eordance with designs and drawings approved by the Division. <br />The timeuble {or riprap installs[ion, in particular the :nstallotion o{the riyerban>< r:prap. <br />Aa a rominder, doe purpose of dte flood controLmitigation plm is to minim ize the pount{d for exeeaalvs scouring <br />and erosion oT p:c slopes and oT berms prot¢cdng crit:cel etrucmros such as gas pipelines, ma of oTFSite impaoss <br />due to aedimenution or renlignmvnt of tine eaciesing river channel. <br />Riproy Locos/osra <br />In order to pr¢vme a esaive sroalon, area that may be aubj r:ct m scour during a flood should be red. To <br />:dsnti{y ar o{scour, the depda and velo¢:ry offloodwatars should be estimaxed and rho gradation of the soil and <br />subsoil (sand and gravel) may be examined along with tregeut:en charscser:acics to deurmine iT dtc erosive power <br />of the flood will cut taco tins yegemcion and soil. Plmemmt of larger and !]carrier maurlal (riPrap)- that eannm be <br />l:ftad and m ved by floodwater, will pmren[ erosion and down cutting i a locations Identified m be prone to scour. <br />Thera aro a number oT published eompuutiond msthods atra:lablo to determ ins the s:zjng and gradation o{riprnp <br />raquiavM to armor against erosive flows o£different velocidec. <br />Depth and v¢lociry o{ floodwntar :ncroases cxponcntlally in flood cwnta of Increaa:ngly lower probability of <br />oeeurronee. The ten-p¢remc etmual ehmce flood (the so-called ten-year flood) roaulu In n subaant[ally lower <br />Clow, d¢pth, and velocity then a o-pe mt annual chance flood (the ] 00-year return period event). Desfgna for <br />armoring against erosion during an100-year flood would moat Illcely f Il during a much larger, brat longer return <br />
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