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•J ~-, N-= U- S 9 T U E //2 11 1 0 E~U-~A7N S & 13 R I G G S ATTORNEYS P_ 0 2 <br />' ~ lJ~ring, ~Yurth & A86~Ci~~s <br />C;onaulting G!vtl Enylneera <br />_^ Registered Lund Surveyors <br />101,1 Elkton Drive' Colorado Springs, Colorado 8O9U7 ~ Phone (714) 63]•62UO <br />MEMO: Snyder Amr+ndn~ant <br />Hydrolo$Ic Supplament <br />June 2U, 1980 v3' 0:10 A.M. <br />YroSect No, Et9U0'L <br />1 rpcelved a cal! from John Doerfer at MLRU regardin8 our submittal of <br />ti~~~ hydrolo$Ic supplrmnnt, ]le had ravlewed the study and found 1t to be <br />~u~uylele and rosj,ortslvc to thou hydrologic, concerns. tin haA the followi~iY <br />quzatlons/comments. Uboring, Worth 81 Assoclatos' (OWA) responses <br />Included whore appropriate. <br />1. 'fho concept of otf-channel silt retention as opposed r.o rt,e rnultip. <br />on cttartnel checks originally proposed seams appropriate 1:t tltlfi case <br />and the revision to the original submittal is acceptable. <br />RFC+PONSR: The Opnrat.or agrees. <br />z ,lln,lar facility will be necessary for the Fhasu !V arelt when n:inlu!!, <br />occurs on t~hc other side of the natural dralnaga, <br />Rh:Si'UNSF:: `t'itle is outside of rite amcrrdmcnt area and wotttA be <br />addreftsaA as a aaparata Issue. <br />3. t7nui deslLn us-built drawlnl;a will averiurally bo required for all <br />1,ropofteA fac111tiaa, <br />RESPONSE; ]t is the Operator's Intent to provide aa-built. drawings as <br />indicated lu the Suuuuary seaport on f'agc 10. <br />4. what is t.hc rcc.lamatfon plan for tfi~ pond area? will 1t remaln~ tf <br />ao, on8olug malntcnancc w111 be roqutrcd, if not, how will 1t. 1•.c rnaAc <br />Inoperative and reclairned't It could probably trove ilia spillway graded <br />out, <br />RESPONSE; I dofcr this to Castle and/or Mark 1iolfner. <br />fi. The time oP ronrantratlon calculations for Subbasln 8-0 wero not <br />lnrludad, Plcasa prnvid9 this lnformattnn. <br />1ESPONSE; we lnadvertcntly forgot those {'!gores In our summary, a <br />new and complete summary sheet will be provided. <br />G, Tttc R factor' used !n the Universal Soll-Loss Equation (t181,E) for nor <br />corrtyutatlone was 7b. MLRD is utore used to seaing a factor of GU <br />ttaeA in cornputatlona and foal 76 la conservative, What is the sourc^ <br />of nt.r number. <br />1tk:SPUNSt:; wo used tha rctfaruuco "lrrosion and bcdlrnont Control llt <br />Urbartizlnr; Arasa of Colorado", USUA, Soil Consarvatlort Sorvlcc, <br />April 4, 1579. ]r'1$ure 7 on F'ngo 2'~ inAlcates an "R" factor of 7b to <br />be appropriate, n copy of this f1$uro attd the previous l'agc Lt; w1r1 <br />be I,rovldad for Information. <br />~t~y 4• <br />