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~- <br />08-12-1998 15:57 <br />~~I ~I~~I~I~~~~~~~~~ <br />CONSTRUCTION SUPPLY, lNG <br />- ~C <br />To: <br />Co.: <br />Fa>ta <br />Re: <br />z3io south sy:aanwo way, Heaver, o0 80231 <br />(303) 696-8960 • Fax (303) 696.0620 <br />John Winters <br />Grand Valloy Coal Compa:ry <br />ago asaaafro <br />Trapasoldal Ditch An:ror Mat~-ala <br />from: IKara t3win <br />~aOesr 11 <br />• Comm.:>ta: <br />HI Jahn: <br />I discussed your proJsd with the pays at Synthetic a:dwb9es, and explained our <br />feeling d over-kill because d the E C Design program 6rtritatlorrs. They suppewted I <br />calculate the Shear Stress based on your rxurrbea and rooommsrtd a product based <br />on those results. (This was so easy Cm almost embertasasd my response to you is <br />eo late.) <br />The resutm d that calaa<ation, and my reoommer~dstian for the ditch lir>!np are on the <br />next papa. Fdlowinp that b info on turf relnforcentent mete and installetlon <br />ptadeiines. Reference the table on papa 5 d ttds hoc t,andlok TRM 450 in a rarr- <br />vepetalsd corrdtion will perform duririA long germ (50 hr.) everds when veloclves are <br />up fA 8 fps, end shear stresses are up to 2 ltxrlsf. All your bash dreinapes fall within <br />these parameters with the exceptlon d Baairr G vvlrldi b just over on shear straws. <br />Slrx:s your oorulderinp flows over a 24 hour period, Baaln G should bs ok Please <br />conwider wlderunp the eosin G Channel sAghtlyr b drop ttw shear stress to within the <br />reoanrrrended criteria. <br />Another change you could make to the otrerr~ conApuration is to cFuupe the Bide <br />slopes to 1.5:1 or Z:1. Thts Is dependent an the sod types. Neither of my proQarsrs <br />(for aoR armor or had emtor) like 1:1 side slopes; bath propfanrs flesh those nerdy <br />mean wamirps that the side slopes aro too steep and a peoted~Ncal atralysie needs <br />to bs psrforrned. <br />Data: os~tzroa <br />I will UPS a «~alag d erosion control products in tomonvvVe shipment. I will include <br />sar>ples d both TRM 450 and TRM 1080. I baps this helps. Please call ff !can <br />answer any other rtuewtlorfe. <br />