Laserfiche WebLink
SITE DESCFI FTION <br /> <br />Land Use. Sediment Pond 006 is in a watershed that is tributary to Hubberson Gulch. This <br />watershed wtil be disturbed by m t nl ng ac[iviu es as shewn on Ezht t•i r. 1?-2 and <br />xntemporaneously [eclaimed as shewn on Ex hi bt[ 19-1. Design for Phase IV was based on <br />the ma ::i mum prr•posed dis *.u rba nee of the emir= watershed excluding the ac reaye contained <br />by [he Clean Water Dt vetaion. This design was r'o nducted under exi sting co ndrti•~ns which <br />is the "worst •=ase" scene ao fc•c [h= life-nf-mine distu~~ane= area. <br />G?N STFUCTI OII (Brtefl <br />Embankment. The er.is unq embankm=nc is a hrannaen e~?us catch fill structure. The cep <br />width cf [he redesigned =n,ba nl:ment will be '0 fe~c and upstream and downs r. roam slopes ~f <br />aNprU?:1 maLely jh: 1'. each. The prl ^•: iF•31 Sp111wd/ Wi11 ~S.n51~t ~•f d =a-inch dLamSiel dCUp <br />inlet CF1 F, the sFparate emergency .,ptllway Consists et a Crapezo idal ~-l,a noel. E'l ease <br />refer to Exhibt[ 13-66. <br />Eacavaiion IFO nd At ea 1. F sma 11 pn rr ion of [he original pond ca F~a city was a result of <br />ex ca vattng below natural ground 1=vet. E::cavated suitable material was used in • <br />emt•a nk.ment construction. F,x cess rt,a tetial wan ~.+asted. TLe po r,d side slopes ar= 2h:1 :~ or <br />flatter. Foc F'hase I'v, no further e::~a vatton of the pending area is necessary. <br />DESIGtl r11p.L'i SIS <br />General. Sediment Fond U06 and the Pre-Settling basin were redesigned t•:• me=_[ oc er,ceed <br />the design and p=rformance teyuir=menu of Co Lx ado F1i ne•d Land Reclama[ton Division while <br />uu ltzir,g as much of the er.isting rr.F,og ra pt,; as F•ossit,l e. Sediment F..•nd n06 was d=signed <br />to adhere to the following specificatt c~n: <br />1. E'n_vtd= sic rage and rrea[ment for the runoff ftcm the 10-year, 24-hour storm event <br />without experiencing an discharge [hir,ugh the emergency sptllwa y; <br />Both pond 006 ar,d the Pre-Sett ling Basin were designed of adhere cc. the following <br />spe~iftcations: <br />1. F'awtde an eme rgenr/ spillway capable of passing runoff from the _ -;ear, Li-hour <br />storm event; <br />_. Fu•v ide adequate storage for sediment geneca[~d as determined fr„ni the SEDrAD+ <br />computer proyra m. <br />H,drology. The hyd rc logy •:;f th< ware [shed was enalyz u,j uLtltzing the SEDCF.D~ rcmpu[er <br />_ Revised 0s/OC/78 <br />