The URL can be used to link to this page

Home My WebLink About3.0 CorrespondenceOLSSON* ASSOCIATES August 18,2014 Mountain Cross Engineering Attn: Chris Hale 826% Grand Ave. Glenwood Springs, CO 81601 Re: Noble Rulison Laydown Yard, LPAA-7824 Dear Chris, Thank you for your review, comments, and suggestions. After careful consideration we have made revisions accordingly. Please see our responses to your comments below. 3. The Applicant shall provide a greater explanation of the post development coefficients contained in the Grading and Drainage Report. ln addition, the detention volumes need to be verified based on these coefficients. This information shall be submitted to the Gartied County engineer for review and acceptance prior fo issuance of the Land Use Change Permit. The post development coefficients have been updated to reflect the post development conditions; these coefficients were taken from the Urban Storm Drainage Criteria Manual, Volume 1, Table ROs - Runoff Coefficients, C and are based on the NRCS Hydrologic Soil Group, percent imperviousness, and the design storm. This table is included in Appendix B of the Final Drainage Report for reference. Please contact us if you have any further questions. Sincerely, ilr&ff Wyatt E. Popp, PE Cc: Mike Bonkiewicz, Noble 760 Horizon Drive, Suite 102 TEL 970.263.7800 Grand Junction, CO 81506 FAX 970.263.7456 www.olssonassociates.com Frruru DnatruAGE Reponr NOBLE ENERGY INC. RULISON LAYDOWN YARD GARFIELD COUNTY, COLORADO Pnepeneo roR: NOBLE ENERGY INC 8OO AIRPORT ROAD STE 3 R|FLE, CO 81650 PH: (970) 625-1494 GONTAGT: MIKE BONKIEWICZ PReplneD BY: OLSSON ASSOCIATES 750 HORIZON DRIVE, STE 102 GRAND JUNCTION, CO 81506 PH: (970) 263-7800 CONTACT: WYATT E. POPP, PE, LEED AP Mw 12,2014 Revlseo Aucusr 18,2014 Olsson Assocrares Pnorecr No. 013-2329 oL550N A S 5 O C I AT E S ENGINEER'S STATEMENT I hereby certify that this Final Drainage Report for the design of Noble Energy lnc. Rulison Layout Yard was prepared by me, or under my direct supervision, in accordance with the sound engineering practices for the owners thereof. I understand that Garfield County does not and will not assume liability for drainage facilities designed by others. sltcl n Wyatt E. Popp, PE Registered Professional Engineer State of Colorado No. 38514 Date OWNER'S STATEMENT |,,herebycertifythatthedrainagefacilitiesforNobleEner9y lnc. Rulison Laydown Yard shall be consiructed according to the design presented in this report. I understand that Garfield County does not and will not assume liability for the drainage facilities designed and/or certified by my engineer. I understand that Garfield County reviews drainage plans but cannot, on behalf of review will absolve guarantee that final drainage design and/or their successors and/or assigns of future liability for improper design. I further understand that approval of the Final Plat and/or Final Development Plan does not imply approval of my engineer's drainage design. Owner/Developer Authorized Signature Date Noble Energy lnc. Rulison Garfield County, CO 013-2329 DRAINAGE REPORT t. A. B. C. D. il. A. B. C. ilt. A. B. C. D. lv. A. TABLE OF CONTENTS DRATNAGE SYSTEM DESCR|PT1ON................... ..............................2 Existing and Proposed Drainage Conditions ...................2 Master Drainage Plan To our knowledge, no master drainage studies have analyzed the site...............................2 DRAINAGE ANALYSIS AND DESIGN CRITERIA ........................3 POST-CONSTRUCTION STORMWATER MANAGEMENT .............................3 Stormwater Quality Control Measures ....................3 B. Compliance with Colorado Oil and Gas Conservation Commission Criteria..... .........4 APPENDIX A: MAPS AND EXHIBITS APPENDIX B: HYDROLOGIC CALCULATIONS Noble Energy lnc. Rulison Garfield County, CO 013-2329 DRAINAGE REPORT A. B. I. INTRODUCTION Background This Final Drainage Report has been prepared by Olsson Associates for Noble Energy lnc.'s proposed laydown storage area, known as the Rulison site (the site). This report evaluates the site's existing drainage patterns, analyzes the change in stormwater quantity/quality associated with proposed development, and provides design to alleviate the impacts of increased stormwater runoff due to the proposed development. Project Location Thesiteislocated intheNE Taof the NW%of Section lT,TownshipTSouth, Range94West of the Sixth Principal Meridian, County of Garfield, State of Colorado. The site is approximately 4.77 miles southwest of the town of Battlement Mesa. Refer to Figure 1 for project location. C. Previous lnvestigations To the best of our knowledge, no previous drainage investigations have been conducted in regards to this site. D. Property Description The site consists of an existing 5.5 acre pad site that was previously graded into mountainous terrain. Noble Energy lnc. Rulison Garfield County, CO 013-2329 Figure 1: Vicinity Map DRAINAGE REPORT The site owner plans to upgrade the site into a laydown storage area. The topography is generally flat and drainage from the site travels to the northwest corner where a shallow depression is located. According to the NRCS Web Soil Survey, soil in the area of the site consists of Potts loam, which is classified as hydrologic soil group Type C. A soil map from NRCS is included in Appendix A. II. DRAINAGE SYSTEM DESCRIPTION A. Existing and Proposed Drainage Conditions The site consists of a pad, which has a gentle slope to the northwest. This pad is divided into four sub-basins, A, B, OS-'1, and OS-2. Drainage Basin A comprises 2.59 acres of the developed area, and drains via sheet flow, diversion ditches, and rock run downs into the proposed detention basin, located in the northwest corner of the site. Drainage Basin B, which surrounds Basin A, has an area of 0.78 acres. Basin B drains via sheet flow off-site into an existing and natural drainage way. Drainage Basin OS-2, consists of 2.13 acres on the south half of the pad. This basin drains via sheet flow into drainage Basin A, which is conveyed through the proposed retention pond. The up slope area located on the southern and eastern property boundaries, denoted as drainage Basin OS-1, comprises 4.9 acres of undeveloped area that drains towards the south half of the pad. The runoff from drainage Basin OS-1 will be intercepted by a proposed swale, which runs along the boundaries between drainage Basins OS-1 and OS-2. This swale will discharge to the west towards an existing and natural drainage way. The proposed drainage system will provide a drainage swale to convey offsite stormwater around the pad to an existing and natural drainage way. Table 1: Site Peak Runoff (Existing and Proposed) Basin ID 25-YR Peak Flow (cfs) {00-YR Peak Flow (cfs) Description A 2.89 5.29 Flow to basin B 0.54 1.61 Flow off-site os-1 2.39 4.42 Conveyed around site os-2 2.78 4.53 Conveved throuqh basin Master Drainage Plan To our knowledge, no master drainage studies have analyzed the site. Drainage Facility Maintenance The owner shall be responsible for maintaining all on-site drainage facilities. ln addition, the detention basin and swales should be examined after any slgnificant rainfall event to ensure proper functionality and prevent erosion. c. Noble Energy lnc. Rulison Garfield County, CO 013-2329 DRAINAGE REPORT III. DRAINAGE ANALYSIS AND DESIGN CRITERIA A. Regulations This report has been prepared in accordance with common engineering practices, the Urban Drainage and Flood Control District's Urban Storm Drainage Criteria Manual, and Garfield County standards. B. Development Criteria There are no known constraints placed on the site due to floodplain studies, master drainage studies or adjacent property drainage studies. Flows from upstream land will be diverted around the site. C. Hydrologic Criteria Hydrologic calculations have been prepared in accordance with common engineering practices. Rainfall intensities used are sourced from the NOAA Atlas 14 Hydrometeorological Design Studies Center. Refer to Appendix B for all hydrologic calculations. D. Hydraulic Criteria Hydraulic calculations have been prepared in accordance with common engineering practices and the Urban Drainage, Flood Control District's Urban Storm Drainage Criteria Manual, and the Garfield County Land Use and Development Code, Article 7, Section 204. IV. POST.CONSTRUCTION STORMWATER MANAGEMENT A. Stormwater Quality Control Measures The retention basin, which was designed to retain lhe24 hour 25 year storm with an emptying time of less than 24 hours with less than 50% of the water volume draining in 12 hours, in accordance with the Garfield County Land Use and Development Code, Article 7, Section 204. See Appendix B for the infiltration calculations. V. CONCLUSIONS A. Compliance with Manual This report has been prepared in accordance with common engineering practices, the Garfield County Land Use and Development Code, and the Urban Drainage and Flood Control District's Urban Storm Drainage Criteria Manual. Noble Energy lnc. Rulison Garfield County, CO 013-2329 DRAINAGE REPORT Compliance with Colorado Oil and Gas Conservation Commission Criteria 1 00-Year Run-on Diversions Along the south and east sides of the site a swale, will be constructed to convey the run-on flow. The swale will discharge on the western side of the site towards an existing and natural drainage way. 25-Year Run-off Control Run-off from the site will be captured in the northwest corner of the site. Design Effectiveness Proper implementation of the proposed measures outlined in this report will alleviate the direct impacts of stormwater run-off on adjacent, downstream lands. The quantity of stormwater released from the site will be equivalent to existing conditions. A registered licensed engineer in the state of Colorado should be consulted for the preparation of construction plans related to the recommendations outlined within this report. Areas in Flood HazardZone The site is within FEMA Panel 08020513508, which has not been printed. Based upon this and the relative elevation above the nearest major river (approximately 900 vertical feet), the flood risk has been determined to be minimal. VI. REFERENGES 1) Stormwater Management Manual, City of Grand Junction and Mesa County 2) Urban Drainage and Flood Control District Urban Storm Drainage and Criteria Manual, Vols. 'l-3 3) Garfield County Land Use and Development Code, Article 7 Section 204 c. D. Noble Energy lnc. Rulison Garfield County, CO 013-2329 DRAINAGE REPORT APPENDIX A: MAPS AND EXHIBITS Noble Energy lnc. Rulison Garfield County, CO 013-2329 DRAINAGE REPORT APPENDIX A TABLE OF CONTENTS Hydrologic Soil Group (HSG) lnformation - HSG map, legend, and description. HSG information is used in the hydrologic calculations General Location Map - Project location shown on topographic map Noble Energy lnc. Rulison Garfield County, CO 013-2329 DRAINAGE REPORT ; i6 3 A = fi L Soil Map-Rifle Area, Colorado, Parts of Garfield and Mesa Counties Map Scale: 1:1,450 ifprinH on A port"it (8.5" x 11") $eet uoffiA reetl\oso1m2m3m ,\ Map ryotedim: v\hb Mercator corneroordinates: wGS84 Hgetics: UTM zor€ 13N wGS84 390 27 11'N 39 27 l1', N 3 3 R Web Soil Survey National Cooperative Soil Survey 4t22t2014 Page 1 of 3 396 27 1'N USDA Natural Resources-fr ConservationService 39" 27 1" N '/ry:il, * $O oo{o Ngto(L 0) eIa >bYa =o6Z_-Noi(,& !OoOB96coEGz .q E =o() 6 o !c(5 6E6o oaE6(! dEo 9oo d E o =t Io6 oa ooo>g,I 3EOs5i!!o =o60z<) 6[ gESSoPe eH E E = a * E Ee tcTH f E ; i HcEE Eg Ec;P E c f; H st,E EEIN ;EEE,E EFE:;EE t sEE fl;EE [3. 5 8g E e#f iEiiEEBEEEE#EgEIEEE ei gig iEegE aE a*B e* i EEEE ooo-\tq! G ooo =6OEk:E(J E,=osll o)z3o.E =e oIf oq (n-F 4*E>FSE.':;.906P: E Igpp E- E .9. d E 6 E,*E#gEEsE-E=i $E E,t Eil fI 6oa oo::>a;5- F;8sgE -*a-eA g ui= E o $ - g; EEf i, e>a e^ 6H ==EE _ [ A ,H;6EE'-*EE u-r^Y rrrE EtSr{ e*q HiEXL -s*.;i ?E ;; ; tE i 3 3 E S = E E E E E 3 E E } # g Hoo- :G Entn t .,EaG! N c,x"r sd4 qg @# F +:": * qaa.@ <o lS**ffit>soz IIJ(, IIJ o. = Soil Map-Rifle Area, Colorado, Parts of Garfield and Mesa Counties Map Unit Legend Acres in AOI Percent of AOI 45 Morval-Tridell complex, 6 to 25 percent slopes 3.3 33.7% 70 Vale silt loam, 12 to 25 percent slopes 6.5 66.3% Totals for Area of lnterest 9.8 100.0% USDA Natural Resources - Conservation Service Web Soil Survey National Cooperative Soil Survey 4t22t2014 Page 3 of 3 Rifle Area, Colorado, Parts of Garfield and Mesa Counties (CO683) Map Unit Symbol Map Unit Name R!!r$N tuAtililcLL .":i-lriiri:i: riArFrL:t (11 Jl.,j ! rl l ii-t .,a/- ' a SITE .: '', i 1\tl11l; lll\ll;t rA|li,\\l. llitilljl -., APPENDIX B: HYDROLOGIC CALCULATIONS Noble Energy lnc. Rulison Garfield County, CO 013-2329 DRAINAGE REPORT APPENDIX B TABLE OF CONTENTS Drainage Basin Plan - Watershed boundaries used for hydrologic calculations Grading Plan - Proposed Earthwork NOAA Atlas 1 4 Precipitation lnformation Table RO-s - Runoff Coefficients, C IDF Curve Calculations Composite "C" Factors Table - Composite C values based on percent imperviousness and HSG, to be used in hydrologic calculations 2-Year Runoff Table - Calculations for the 2-year storm event runoff 25-Year Runoff Table - Calculations for the 25-year storm event runoff 100-Year Runoff Table - Calculations for the 100-year storm event runoff Swale Conveyance Calculations Spillway Calculations Basin Retention and lnfiltration Volume Calculations Basin Stage Storage Volume Noble Energy lnc. Rulison Garfield County, CO 013-2329 DRAINAGE REPORT !l{lil liltlfl l f |itl -.fr"l!lili!r n d qlg'Mt6u 'szl'lr NollSls io t/l MS lo r/l fN cNl 'leurNS 3180N dVY! fEVNIVUO ONIlSIXS V]UV fOWOIS NMOO fl 4x6dp5 aoo 1it==:zzi;;zqqa ll" , ---il,i nq. X >i 1 = 9F) a9 do u- t 2 zaz t t;, ss?l \l /Jr -\lr ll /r \l/r ll/r /iYr lB#r \ll-/I! I __l I I \ll ilrlti t,t.t* r5,'Jir i ,' -j. trrf .T:,'9T..?,H!i? ttlvtroSSv'NOSSIO\O ffi Eii;iEiE:iEIl miiE;! rroz I oovuotoc ^tNnoSol3lluYc rlslil lil!l:lllitL! 'li:r: IiiiSi!r I 'ndqlg'Mt68 sll'1tNOil3fSlOr/lMS :Otll :N 3Nr'lculNf fl80N dv}\ f gvNrwo o3sodoud vluv fcvuols NMoolvl**"-"*'* I "' s -.-t.; It ecti: - r >oS:6I6<i<z,i:>>>5 5 *n.-' gg(DXX{,z z <AA<66iEuia u u ocilo 6 oz c 6 o L 3 I 3 5 E--; Y{B?iill'i,llliiiirrllli t roos-5zrr-.1\.eqrpe,A4tr\62.2 r!o\q4od\l _l ffil,i:E lrtl,))';)'r'r'; 'V il,f ii.iii,"',1.{ii,ti\i5:.i,' II tpit Itlltaflli*i ,1,i i .; ,i iLI i r' t t,^. :s3!x 6rp'rza rcsnft !oGc-6zrz-rr\.oor!-ro*\Ad\eaa-aro\3lr{ord\:r 6l ;e EE { I eEtlE I !l'Fr l; I :;it l: El ;!Eul; l; ;l EiiEI; li 5l ilEs El.li;|,;uiE[Et El: kll,,,:ii5 .L;tol El u13 o!'. := tt el .e-E *ri \t /-, t{:q U'.bd -,Frr /r lE' t. I q z 8 s1 El 5[ Hl;!F 4t9,b EIE,€ Il./s <lil -E(HdA)! o o ^4 2t2uo9 ,. Uo6rca *n>o9< 6062d>^ 2272>; ==;9PP 999H8ia66iE""E d x x dd Co6duodo 5 =3 hB EB 9* g 3:j 1-_ E9E :s i, -\a_-: .a tt\it,tl Ittt ll ltlllt llli iia rl Ilrl l--: ltl lll lll rrl)ltiiiliiiii,,'tf,),'f,l't !ltl(ti/{r / ,'-lr-,/, I i-'.,\ijdg\ '. I i ;:',\'i ii iH', I 1 '- -, --'.N-', ! '--':t:a\ I \ \ :F:\\"_\\ | I iJt\i\.\.\t\\.\ i I Precipitation Frequency Data Server Page I of3 NOAA AUas 14, Volume 8, Version 2 Location name: Rifle, Colorado, US' Latitude: 39.4435', Longitude: -107.9086' Elevation:7343 ft" 'source: Google MaPs POINT PRECIPITATION FREQUENCY ESTIMATES Sanja Perica, Deborah Mafrin, Sandra Pavlovic, lshani Roy, MichaelSt. Laurent, CarlTrypaluk Dale Unruh, ldichael Yekta, Geoffery Bonnin NOAA, National Weather SeNice, Silver Spring, Maryland PF tabular I PF oraDhic€l I Maos & aertals PF graphical PF tabular PDS-based estimates with 90% confidence intervals (in i 10.2 (6.74-1 5.5) 4.07 (2.98-5.8s) 't.25 (1.02-1.58) 't.06 (o.a24-1.43) Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS). ers in parenthesis are PF estimates at lower and upper bounds of the 90o/" confidence interyal. The probability that precipitation frequency estimates (For a duration and average recurrence interual) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not against probable maximum precipitation (PMP) estimates and may be higher than curently valid PMP values. refer to NOAA Atlas 14 document for more information. http://hdsc.nws.noaa.gov/hdsc/pfds/pfdsjrintpage.html?lat:39.4435&lon:-107.908 6&dat... 412212014 Precipitation Frequency Data Server 1g 08r I 6S0 0 1fr0 o 610 0s0r I Page 2 of 3 .c E 5ra e2a d cc€ LEEss R rE ;5,e n 6,qPE6ESeua ESE,Si+ ld Dirgti$n Ft> >>E E6 { 6B Bs 1O ctu *+ * d 4 or 6 a il L 108 0es l0 olls l0B0 E l&o t o10 Dtrnt rn - s-mn s ?-{xy t,ffi - rd., - lcle'l - 741a? - 60-rwr - lE-d:Y 4 l-+rr - to-d.? - ,nr * ttr.1r.l - trhr - 4*{fr} - rl-&. - 6s{iy - ia.lv RnBl It Balllg-T9!tver iqE rpcLfi e r r e i n te ru ; i fyE;J-gI-- Maos & aerials. 'r-.rl-: , .t4t I 'q- l1.r .. ;1U1 ..i -'\l: ; Large scale terrain Small scale terrain http:/4rdsc.nws.noaa.gov/hdsc/pfds/pfdsjrintpage.html?lat:39.4435&lon:- 107.9086&dat... 412212014 Precipitation Frequency Data Server Page 3 of3 qt\ ""*l''f *\* ,r,, /r:- Es: IrI {-J?" - -. r r , .r-*^ L.lr4rI if.' t': i+ri E*.:iN5; f * i"4ap d5ro6sr6llltSsgle Back to Too US DeDarhent of Commerce Natronal Oceanic and Atmospheric Administration National Weather Service Office of Hvdrolooic Development '1325 East Wesi Highway Siher Spflng. MD 20s10 Questions? http://hdsc.nws.noaa.gov/hdsc/pfds/pfdsjrintpage.html?lat:39.4435&lon:- 107.908 6&dat... 412212014 -l-I a Precipitation Frequency Data Server Page I of3 NOAA Atlas 14, Volume 8, Version 2 .. -.. Location name: Rifle, Colorado, US- ,''i!i t Latitude:39.4435',Longitude:-107.9086" rUVJii =J:"',","tJ'JiJ,3i,t",T' '&F POINT PRECIPITATION FREQUENCY ESTIMATES Sanja Perica, Deborah Madin, sandaa Paviovic. lshani Roy, lvlichael St. Laurenl. Carl Trypaluk, Dale Unruh, Michael Yekta, Geoffery Bonnin NOAA, National Weathe. SeNie, Silver Spdng, Maryland PF tabular I PF oraphical I Maos & aedals PF graphical PF tabular PDS-based point precipitation frequency estimabs with 90% confidence intervals (in incles)l Averaqe recurence interval (years) 1 2 5 10 25 50 100 200 500 1000 5-min u.146 0.120-0.1 86 0.'t75 0.142-0.220 0.231 0.147-0.292 o.zE9 o.232-0.367 0.385 0.305-0.532 o.472 o.570 (0.41 7-0.8161 u.buz o 474-1.O1 o.847 0.562-1.29 0.985 0.628-'1.50 10-min o.z1l o.176-0.273 0.257 0.208-0.323 0.339 0.274-0.427 0.423 0.340-0.537 0,564 o 446-0 779', 0,691 '0.527-0.961 0.835 (0.61 0-1.20) 0.998 '0 694-1.47 1.24 0.823-1.89 1.44 o 920-2.20' 15-min 0.265 0.21 5-0.333 0.313 0.254-0.394 I 0.413 ll i(0.334-0.52 1)ll 0.6E7 544-0.9491 0.843 (o.642-1.17) 1.OZ (0.744-1.46) 1.Zl 0.846-1.80 't.51 (1.00-2.30) 1. /tt (1.12-2.681 30-min 0.334 o.271-O.420" 0.414 o-6e5_-.ll io.ssa-o.eaz)l I 0.905 (0.708-1.23) 1.09 (0.821-'1.49) 1.24 (0.929-1.81 1.49 1.03-2.19) 1.80 1.19-2.72\ z.o5 1.31-3.13) 60-min u.4zu 0.341-0.528 0.417-0.64€ f 1-0-6- | (0.824-1.43) 1.25 (0.942-1.71), '1.45 1.tt / 1.15-2.44) r.vu (1.31 -2.99) 2.23 1.42-3.41) 2-ht 0.505 415-0.628 0.614 0.503-0.762 ffit Io.osa-o.sgerll 0.967 (o.784-1.21\ 1.2'l (0.950-1.60) 1.41 1.08-1.90) 1.62 (1.19-2.25\ 1.85 1.29-2.65) z.1t 1.44-3.2'l\ 2.42 1.56-3.63) 3-hr 0.5/u 0.477-O.7',l 0.683 0.562-0.841 0.866 (0.710-1.071 1.03 (0.839-1.28) 1.Zl (1.00-1.66) 1.47 1.13-'1.95) 1.68 (1.24-2.30) 1.90 (1.U-2.70) 2.22 (1.49-3.25) 2.47 (1.60-3.67) 6-hr 0.715 0.832 10 691-1 01) 1.03 (0.853-1.26) 1.20 (0.989-1.47) 1.45 (1.15-1.86) 1.65 '1.27-2.15) 1.85 (1.38-2.50) 2.07 1.47-2.89) 2.37 1.61-3.42\ 2.61 (1.72-3.82) 12-hr 0.895 (o.7s2-1.07) 't.03 (0.864-1.23) 1.26 ('1.05-1.51 '1.45 (1.21-1 .76) 1.74 (1.39-2.20) '1.96 ('1.54-2.53) z.2t) (1.66-2.92) 2.45 (1.76-3.36) 2.79 (1.92-3.s6) 3.05 (2.04-4.41 24-ht 1.10 (0.933-1.30) 1.26 1.07-1.49) 1.53 (1.29-1.82) 1.76 (1.48-2.10) 2.',10 i-1.70-2.62) 2.37 (1.88-3.01) 2.65 (2.o2-3.47) 2.95 (2.15-3.9s) 3.36 (2.34-4.6s) 3.68 t2 49-5.23\ 2-day '1.31 (1.13-1.s3) 1.51 (1.29-1.76\ 1.6J (1.56-2.15) 2.11 1.79-2.49) 2.5',| (2.06-3.0s) 2.84 t2.27-3.54) 3.17 i'2.44-4.O8\ 3.52 (2.59-4.67) 3.99 Q.82-5.48\ 4.37 (2.99-6.09) 3-day 1.46 (1.26-1.69) 1.68 (1.4s-1.S5) 2.05 (1.76-2.38) 2.36 (2.O1-2.76\ 2.81 (2.32-3.42) 3.17 (2.55-3.92) 3.54 (2.74-4.s1) 3.92 (2.91 -5.16) 4.45 (3.16-6.04) 4.85 (3.36-6.71) +day 1.58 1.31-1.42\ 1.42 (1.57-2.1O\ 2.ZZ 1.91-2.56) 2.55 \2.19-2.97) 3.04 (2.s2-3.68) 3.43 (2.77-4.21) 3.42 2.98-4.83) 1.23 (3.'15-5.53) 4-79 13.42-6.46\ 5.22 13 63-7 16) 7-day l.d6 1.U-2.',14) 2.15 (1.88-2.46) 2.61 I 1z.zt-z.sa1 l I 2.99 I I tz.ss-s.aat I I 3-53 I e.ss-t.zz) 3.96 (3.23-4.80) 4.39 (3.45-5.48) 4.E4 (3.64-6.23) 5.U (3.93-7.23) 5.90 (4.1 5-7.99) 1o-day 2.'.14 1.8A-2.42), 2.43 (2.13-2.75) r-e.20-_- (2.83-3.57) 2.91 (2.55-3.31 fJ-32__-l I rz.ee-s.zst I T3, Le?c 88 -4.ss) 4.33 (3.55-5.21) 4.78 (3.78-5.91) 5.24 13.97-5.69) 5.86 G.27-7.72) 6.34 (4.49-8.51 3.73 (3.30-4.18) 4.1S 13.67-4.71) 6.92 (s.10-8.95) 7.42 (5.33-9.79)20-day 2.47 (2.ss-3.20) 4.80 (4.08-5.58) 5.28 3a-5 25\ 5.77 (4.62-7.01) 6.26 (4.81 -7.85) 30-day 3.48 r3 10-3.85) 3.86 t3.44-4.28\ 4.48 4.99 tt 4)-s 58\ 5.69 t4 86-6.55) 6.23 (5.20-7.29\ 6.76 (5.45-8.1 3) 7.30 15 64-9 05) 8.00 (5.94-10.2) 8.53 6.17-',\1.1 45-day -4.%| (:.ar-+.oo)(4.26-s.21) 5.53 (4.95-6.10) 6.17 (5.49-6.83) 7.O3 (6.03-7.99) t.6I (6.43-8.87) 4.29 (6.72-9.85) 8.90 (6.92-1 0.9) g.tt/ (7.24-12.2\ 10.2 0.4a-1'3.2) 60-day 4.90 5.52 (4.98-6.03) 6.51 (s.85-7.13) 7.29 (6 52-8 02) 8.32 9.07 (7.64-10.4) 9.79 (7.97-11.5) 10.5 (a 19-12.7\ 11.3 18.52- t4.2\ 11.9 (8.78-15.3) I Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS). Numbers in parenthesis are pF estimates at lower and upper bounds of the 9oo/o confldence interual. The probability that precipitation frequency estimates (for a given duration and avetage recurrence interyal) will be greater than the upper bound (or less than the lNerbound) is 5olo. Estimates at upper bounds are not ch;cked against probable maximum precipitation (PiIP) estimates and may be higher than curently valid PMP values. Please refer to NOAA Atlas 14 document for more information. http://hdsc.nws.noaa.gov/hdsc/pfds/pfctsjrintpage.html?lat:39.4435&lon:- 107.908 6&dat... 412212014 0.516 0.831 l0 667-1 05) Precipitation Frequency Data Server Page 2 of3 F>>>!n>';>a (6 { il e i! {i!YYS TP FC?Pfr5€ -: tse{B -,-. ilBn - 24ty - ro.M 16 'fi - adrl, * !*sh - ,not! - iO{Kr - !A+ry * l-t, - t$-d.,/ .''.,,- !{r _ W4*r - 6hr * 4rOdt - !l-|1, - 6*-dit - l*J!, H{}ra,A raidt 14. V&amf I rftrrion !Maos & aerials' -r..i:.j |irrl I t,- Ar;' J: ;1 1' ' I Jnll Large scale terrain a*g1, t C&e 51fi5,50 100}]0 Back to Top Average recLrenI e lnt€ry3i fjE-d-i-'r- http://lrdsc.nws.noaa.gov/hdsc/pfds/pfdsjrintpage.html?Iar39.4435&lon:- 107.908 6&dat... 412212014 ;t Precipitation Frequency Data Server Page 3 of3 d'. ;* ?a .;:- -l-I t",lap dat?€?rIffissdf US O"o"r,r"nt ot Corr"r"" National Oceanic and Atmospheric Adm inistration National Weather Service Office of Hvdrolooic Development 1 325 East \ Jest Highway Silver Spnng MD 20910 Questions? HDSC.Questions@noaa.oov Back to Top itai-r i ,.' ''"^ I .i ;' F:l 'x.l rN:ta I - http://hdsc.nws.noaa.gov/hdsc/pfds/pfdsjrintpage.html?lat=39.4435&lon:- 107.9086&dat... 412212014 ,i DRATNAGE CRTTERTA MANUAL (V. 1) 2007-01 Urban Drainage and Flood Control District Table RO-f Runoff Coefficients, C Percentage lmperviousness Type C and D NRCS Hydrologic Soil Groups 2-vr 5-yr 10-vr 25-yr 50-yr 1 00-vr 0%0.04 0.15 0.25 0.37 0.44 0.50 5o/o 0.08 0.18 0.28 0.39 0.46 0.52 1lYo 0.11 0.21 0.30 0.41 0.47 0.53 15%0.14 0.24 0.32 0.43 0.49 0.54 20%0.17 0.26 0.34 0.44 0.50 0.55 2SYo 0.20 0.28 0.36 0.46 0.51 0.56 30Yo 0.22 0.30 0.38 0.47 0.52 0.57 350k 0.25 0.33 0.40 0.48 0.53 0.57 40Yo 0.28 0.35 0.42 0.50 0.54 0.58 45%0.31 0.37 0.44 0.51 0.55 0.59 500h 0.34 0.40 0.46 0.53 0.57 0.60 55%0.37 0.43 0.48 0.55 0.58 0.62 6OYo 0.41 0.46 0.51 0.57 0.60 0.63 65%0.45 0.49 0.54 0.59 0.62 0.65 7004 0.49 0.53 0.57 0.62 0.65 0.68 75%0.54 0.58 0.62 0.66 0.68 0.71 80Yo 0.60 0.63 0.66 0.70 0.72 0.74 85%0.66 0.68 0.71 0.75 0.77 0.79 90%0.73 0.75 0.77 0.80 0.82 0.83 95%0.80 0.82 0.84 0.87 0.88 0.89 1O0o/"0.89 0.90 0.92 0.94 0.95 0.96 Tvpe B NRCS HyDRoLocrc Sotls GRoup o%0.02 0.08 0.15 0.25 0.30 0.35 5%0.04 0.10 0.19 o.28 0.33 0.38 10%0.06 0.14 0.22 0.31 0.36 0.40 1SYo 0.08 0.17 0.25 0.33 0.38 0.42 20%0.12 0.20 0.27 0.35 0.40 0.44 25%0.15 0.22 0.30 0.37 0.41 0.46 30o/o 0.18 0.25 0.32 0.39 0.43 0.47 35%0.20 0.27 0.34 o.41 0.44 0.48 40%0.23 0.30 0.36 0.42 0.46 0.50 45%0.26 o.32 0.38 o.44 0.48 0.5'1 50%0.29 0.35 0.40 0.46 0.49 0.52 55o/o 0.33 0.38 0.43 0.48 0.51 0.54 60%0.37 0.41 0.46 0.51 0.54 0.56 65%0.41 0.45 0.49 0.54 0.57 0.59 70%0.45 0.49 0.53 0.58 0.60 0.62 75%0.51 0.54 0.58 0.62 0.64 0.66 80%0.57 0.59 0.63 0.66 0.68 0.70 85%0.63 0.66 0.69 0.72 0.73 0.75 90%0.71 0.73 0.75 0.78 0.80 0.81 95%0.79 0.81 0.83 0.85 0.87 0.88 100%0.89 0.90 0.92 0.94 0.95 0.96 RUNOFF RO-11 Percentage lmperviousness Type A NRCS Hydrologic Soils GrouP 2-vr 5-vr 10-vr 25-vr 50-yr 10O-vr o%0.00 0.00 0.05 0.12 0.16 o.20 5o/o 0.00 0.02 0.10 0.16 0.20 0.24 10%0.00 0.06 0.14 0.20 0.24 0.28 15o/o 0.02 0.10 0.17 0.23 0.27 0.30 20%0.06 0.13 0.20 0.26 0.30 0.33 25%0.09 0.16 0.23 0.29 0.32 0.35 30Yo 0.13 0.19 0.25 0.31 0.34 0.37 35o/o 0.16 0.22 0.28 0.33 0.36 0.39 40o/o 0.19 0.25 0.30 0.35 0.38 0.41 45%0.22 0.27 0.33 0.37 0.40 0.43 50%0.25 0.30 0.35 0.40 0.42 0.45 55Yo o.29 0.33 0.38 0.42 0.45 0.47 600/o 0.33 0.37 0.41 0.45 0.47 0.50 65%0.37 o.41 0.45 0.49 0.51 0.53 70%o.42 0.45 0.49 0.53 0.54 0.56 75o/o 0.47 0.50 0.54 0.57 0.59 0.61 80%0.54 0.56 0.60 0.63 0.64 0.66 85%0.61 0.63 0.66 0.69 0.70 0.72 90%0.69 0.71 0.73 0.76 o.77 0.79 95%0.78 0.80 o.82 0.84 0.85 0.86 100o/o 0.89 0.90 0.92 0.94 0.95 0.96 RUNOFF TABLE RO-S (Gonti n ued)-Ru noff Coefficients, C DRATNAGE CRITERIA MANUAL (V. 1) 2007-01 Urban Drainage and Flood Control District RO-12 O\oLssoN* ASSOCIATES l'riAz. Stourul sntrA, , Z.tct tD/*z ho ,t trJ = o, St''t 'D71417 6 HZ . o. l31 eu/ne ef,JdAB 6td"r^A 5 ,r4r*) : q,62 'u/nz ba rt'l-*) -' l't>c tD/at]- C t L t o, ), 'rA t$/t',,- f , C,P,ffi,1= 'n/aia- \t I HZ ?3,€.rP,af,a:forJ vt4t/rE (f,,r) 'faa Dtflc,J ?A2rriALL I,u?Atrd,\) (Arro\ C, z t (Crtfa\c>c,, 3.-(cr-:{)t3 a.s, fc,;;.Tl 7 c3,t. qo?17 o,?51 ]^(rr'a,j -.N,"(c".r) o O.t3'l : a, (a,SA 6c, .:,,{,"3 subiect ,DF cclt;ve rCaN:_u- ?J ::1.....t P.:...... gepYf .......e t k il:.e fr. r. oldrcrwn by: Se e,dole: y/\t/7ort Proiect no.: 4-SA5.3 sheet pfOiect: A)oBec - Rcsct6;ot\) Area-Wei g hti n g for Ru noff Coefficient Calcu lati on Proiect Title: Rulison Pre-Development Catchment lD: Basin A - 2-Year lllustration I.EGM{D: El(nY DirectiE Crttrfrtslt Bouoda:r lnstructions: For each catchment subarea, enter values for A and C. Area-Weighted Runoff Coefficient (sum CA/sum e) = 0.04 *See sheet "Design lnfo" for inperviousness-based runoff coefficient values. Runoff-Basin A-PreDevelopment, Weighted C 811212014,1:38 PM Subarea Area Runoff Product ID acres Coeff. A c*CA inout input input output v euctduul 3.37 0.04 o 1:{ 3.37 0.13 CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Rulison - Pre-DeYelopmentProject Title: Catchment lD:Basin A - 2-Year l. Catchment Hydrologic Data Catchment lD = A Area = 3.37 Acres Percent lmperviousn"tt = :]E % NRCS Soil Type = C A, B, C, or D ll. Rainfall lnformation I (inch/hr) = Cl * Pl /(C2 + Td)^C3 lll, Analysis of Flow Time (Time of Concentration) for a Catchment (enter an overide C value if desired, or leave blank to accept calculated C.) (enter an overide C-5 value if desired, or leave blank to accept calculated C-5 Calculations: lV. Peak Runoff Prediction Rainfall lntensity at Computed Tc, I = 1.04 inch/hr Rainfall lntensity at Regional Tc, I = 1.45 inch/hr Peak Flowrate, Qp = o.tl cfs Peak Flowrate, Qp =0.19 cfs Rainfall lntensity at User-Defined Tc, | =762-inch/hr Design Storm Return Period, Tr = 2 years Cl = 24.02cz=3cs=-67d Pt = ----T3l- inches Runoff Coefiicient, C = Overide Runoff Coefficient, C = s-yr. Runoff Coefficient, C-5 = Overide s-yr. Runoff Coefficient, C = (input return period for design storm) (input the value of Cl) (input the value of C2) (input the value of C3) (input onshr precipitation-see Sheet "Design lnfo") 0.04 0.15 lllustration NRCS Land Type Hea!ry Meadow Tillage/ Field Short Pasture/ Lawns Neafly Bare Ground Grassed Swales/ Paved Areas & Shallow Paved Swales (Sheet Flowl Conveyance 2.5 5 10 15 20 Regional Tc Runoff-Basin A-PreDevelopment, Tc and Peako Peak Flowrate, Qp = --*[.lJ- s15 8t1212014, 1.39 PM Area-Wei g hti n g for Ru noff Coefficient Calcu lation Rulison Pre-DevelopmentProject Title: Catchment lD:OS-l - 2-Year lllustration I.Effi{D: FLow Dirertim +- C*fuff Eouodary lnstructions: For each catchment subarea, enter values for A and C. Area-Weighted Runoff Goefficient (sum CA/sum l) = 0'04 "See sheet "Design Info" for inperviousness-based runoff coefficient values. 2 yr run on OS-1, Weighted C 811212014,12:36 PM Subarea Area Runoff Product ID acres Coeff. A c*CA input inout inout output 4.90 0.04 0.20 4.90 0.20 CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Project Title: Rulison Pre-Development Catchment lD: OS-l - 2-Year l. Catchment Hydrologic Data Catchment lD = OS-1 Area =-I156-Acres Percent lmperviousness = ---6166- % NRCS Soil rype =-A, B, C, or D ll. Rainfall lnformation I (inch/hr) = Cl " Pl /(C2 + Td)^C3 Design Storm Return Period, Tr = 2 years (input return period for design storm) C1 = 24.02cz=-*Rcs=--6JF Pt = --615T inches (input the value of C1) (input the value of C2) (input the value of C3) (input onehr precipitation-see Sheet "Design lnfo') Runoff Coefflcient, C = Overide Runoff Coefficient, C = S-yr. Runoff Coefficient, C-5 = Overide S-yr. Runoff Coefficient, C = lll. Analysis of Flow Time (Time of Concentration) for a Catchment _ (enter an overide C value if desired, or leave blank to accept calculated C.) 0.15 _ (enter an overide C-5 value if desired, or leave blank to accept calculated C-5.) Calculations: 0.04 lV. Peak Runoff Prediction Rainfall lntensity at Computed Tc, I = 0.88 inch/hr Rainfall lntensity at Regional Tc, I = 1.37 inch/hr Rainfall lntensity at User-Deflned Tc, I = Peak Flowrate, Qp =___;0.12 cfs Peak Flowrate, Qp =__-- 9127 cfs Peak Flowrate, Qp = o.tz cfs lllustration Regional Tc = User-Entered Tc = 2 yr run on OS-1, Tc and PeakQ 0.88 inch/hr 811212014,12:36 PM Area-Wei g hti n g for Ru noff Coefficient Calcu lation Proiect Title: Rulison Pre-Development Catchment lD: OS-2 - 2-Year lllustration I.EGS{D: FlowDirestim C{fuert Bourday lnstructions. For each catchment subarea, enter values for A and C. Area-Weighted Runoff Coefficient (sum CA/sum l) = 0.04 nsee sheet "Design Info" for inperviousness-based runoff coefficient values. 2-yr OS-2 Pre-Development, Weighted C 811212014,12:39 PM Subarea Area Runoff Product ID acres Coeff. A CA input input input outout V(2.13 o4 0.09 2.13 0.09 CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Project Title: Catchment lD: Rulison Pre-Development OS-2 - 2-Year l. Catchment Hydrologic Data Catchment lD = OS-2 Area =-TAcres Percent lmperviorsness =:% NRCS Soil Type = C A, B, C, or D ll. Rainfall lnformation I (inch/hr) = C1 . Pl /(C2 + Td)^C3 Design Storm Return Period, Tr =2 years (input return period for design storm) Cl = 24.02 (input the value of C1) cz=3 (inputthevalueof c2) C3= 0.759 (input the value of C3) P1= 0.51 inches (input on+hr precipitation-see Sheet "Design lnfo") lll. Analysis of Flow Time (Time of concentration) for a catchment RunoffCoefUcient, C = 0.04 Overide Runoff Coefficient, C = _ (enter an overide C value if desired, or leave blank to accept calculated C.) s-yr. Runoff Coefiicient, C-5 = 0.15 Overide s-yr. Runoff Coefficient, C = (enter an overide C-5 value if desired, or leave blank to accept calculated C-5.) Calculations: lV. Peak Runoff Prediction Rainfall lntensity at Computed Tc, I = 1.19 inch/hr Rainfall lntensity at Regional Tc, | =------lJTincnlnr Rainfall lntensity at User-Defined Tc, I = 1.19 inch/hr Peak Flowrate, Qp = 0.10 cfs Peak Flowrate, Qp = o.1g cts Peak Flowrate, Qp = 0.'10 cts lllustration NRCS Land Type Heavy Meadow Tlllage/ Field Short Pasture/ Lams Nearly Bare Ground Grassed Swales/ WaleMavs Paved Areas & Shallow Paved Swales (Sheet Flow) Conveyance 5 7 10 '15 20 Regional Tc = 2-yr OS-2 Pre-Development, Tc and PeakQ e11212014,12:39 PM Area-Wei g hti n g for Ru noff Goefficient Calcu lation Project Title: Rulison Post-Development Catchment lD: Basin A - 2-Year lllustration I.EGE{D: Elsrv Dir€rtim +- c*tued Eouod*y lnstructions: For each catchment subarea, enter values for A and C. Area-Weighted Runoff Coefficient (sum CA/sum A) = 0.23 "See sheet "Design lnfo" for inperviousness-based runoff coefficient values' Runoff-Basin A, Weighted C 811212014,12:33 PM Subarea Area Runoff Product ID acres Coeff. A c*CA input input inout outout Gravel 1.85 0.31 0.57 o.74 0.04 0.03 2.59 (,_ti(I s**t""] CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Project Title: Catchment lD: Rulison Post-Development Basin A - 2-Year l. Catchment Hydrologic Data Catchment lD = A Area = 2.59 Acres Percent lmperviousn".t = .@ % NRCS Soil Type= C A, B, C, or D ll. Rainfall lnformation I (inch/hr) = Cl * Pl (C2 + Td)^C3 Design Storm Return Period, Tr = 2 years (input return period for design storm) C1 = 24.02 (input the value of C1) C2= 5.21 (input the value of C2) C3= 0.759 (input the value of C3) P1= 0.51 inches (input one.hr precipitation-see Sheet "Design lnfo') lll. Analysis of Flow Time (Time of Concentration) for a Catchment Runoff Coefficient, C = 0.23 Overide Runoff Coefficient, C = _ s-yr. Runoff Coefficient, C-5 Overide S-yr. Runoff Coefflcient, C = (enter an overide C value if desired, or leave blank to accept calculated C.) (enter an overide C-5 value if desired, or leave blank to aecept calculated C-5.) Calculations: lV. Peak Runoff Prediction Rainfall lntensity at Computed Tc, I = 1.17 inch/hr Rainfall lntensity at Regional Tc, I = 1.45 inch/hr Rainfall lntensity at User-Deflned Tc, I = 1.17 inch/hr Peak Flowrate, Qp = 0.69 cfs Peak Flowrate, Qp = 0.40 cfs lllustration NRCS Land Type Heavy Meadow Illage/ Field shon Pastu rel Lawls Nearly Bare Ground Grassed Swales/ Waterwavs Paved Areas & Shallow Paved Swales (Sheet Flow} Convevance 2.5 5 7 '10 '15 20 Regional Tc User-Entered Tc Runoff-Basin A, Tc and PeakQ Peak Flowrate, Qp =-6165'cts 8t12t2014,',t2.34 PM Area-Wei g hti n g for Ru noff Coeffic ient Calcu lation Proiect Title: Rulison Post-Development Catchment lD: Basin B -2'Year lllustration I.EGE{D: FlowDir€{tim +-c*tuffi Boundry lnstructions: For each catchment subarea, enter values for A and C. Area-Weighted Runoff Coefficient (sum CA/sum A) = 0.04 *See sheet "Design lnfo" for inperviousness-based runoff coefficient values' Runoff-Basin B, Weighted C 811212014,12:35 PM Subarea Area Runoff Product ID acres Coeff. A CA inout inout input output Veoetaion 0.78 0.04 0.03 0.78 0.03 CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Project Title: Rulison Post-Development Catchment lD: Basin B - 2-Year Catchment Hydrologic Data Catchment lD = B Area = 0.78 Acres Percent lmpeNiousness = J% NRCS Soil Type = C A, B, C, or D ll. Rainfall lnformation I (inch/hr) = Cl " P'l /(C2 + Td)^C3 Design Storm Return Period, Tr = 2 years (input return period for design storm) C1 = 24.02 (input the value of C1) Cz= _ sz (input the value of C2) C3= 0.759 (input the value of C3) P1= 0.51 inches (input one.hr precipitation-see Sheet "Design lnfo") lll. Anatysis of Flow Time (Time of Concentration) for a Catchment Runoff Coetflcient, C = Overide Runoff Coefficient, C = 5-yr. Runotf Coetflcient. C-5 = Overide s-yr. Runoff Coefflcient, C = 0.04 0.1 5 Calculations: ]V. Peak Runoff Prediction Rainfall lntensity at Computed Tc, | = 1.36 inch/hr Rainfall lntensity at Regional Tc, I =1.51 inch/hr Rai nfall I ntensity at User-Defi ned Tc, | = ---756- i nch/hr (enter an overide C value if desired, or leave blank to accept calculated C.) (enter an overide C-5 value if desired, or leave blank to accept calculated C-5.) lllustration Peak Flowrate, Qp = 0.04 cfs Peak Flowrate, Qp = 0.05 cfs Peak Flowrate, Qp = 0.04 cfs NRCS Land Type Heavy Meadow llllage/ Field Short Paslure/ LaMs Neany Bare Gro', n.l Grassed Swales/ Paved Areas & Shallow Paved Swales fSheet Flow) Conveyance 2.5 5 10 15 20 Runoff-Basin B, Tc and Peako 811212014,12:35 PM Area-Wei g hti n g for Ru noff Coefficient Calcu lation Project Title: Rulison Post-Development Catchment lD: OS-2 - 2-Year lllustration lnstructions: For each catchment subarea, enter values for A and C Area-Weighted Runoff Coefficient (sum CA/sum l) = 0.25 *See sheet "Design lnfo" for inperviousness-based runoff coefficient values. 2yr run on OS-2, Weighted C 8t1212014,12.37 PM FlcwDirEstim+- C*fueqt Boundafr Subarea Area Runoff Product ID acres Coeff. A CA inout inout input output Gravel 1.63 o.0.51 0.50 0.04 o.o2 2.'.l3 0.53 CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Project Title: Catchment lD: Rulison Pre-Development OS-2 - 2-Year l. Catchment Hydrologic Data Catchment lD = OS-2 Area =---TJTAcres Percent lm perviousness -- @ % NRCS Soil Type = C A, B, C, or D ll. Rainfall lnformation I (inch/hr) = Cl " Pl /(C2 + Td)^C3 2 years (input return period for design storm)Design Storm Return Period, Tr = C1 = C2= C3= P1= Runoff Coefficient, C = Overide Runoff Coefficient, C = 5-yr. Runoff Coefficient, C-5 = Overide s-yr. Runoff Coefflcient, C = Calculations: 24.02 5.21 o759------Il5T inches (input the value of Cl) (input the value of C2) (input the value of C3) (input onehr precipitation-see Sheet "Design lnfo") lll. Analysis of Flow Time (Time of Concentration) for a Catchment (enter an overide C value if desired, or leave blank to accept calculated C.) (enter an overide C-5 value if desired, or leave blank to accept calculated C-5.) lllustration 0.25 0.33 lV. Peak Runoff Prediction Rainfall lntensity at Computed Tc, Rainfall lntensity at Regional Tc, Rainfall lntensity at User-Defined Tc, t=1 "33 inch/hr l=----lTTincunrl=Tinch/hr Peak Flowrate, Qp = 0.71 cfs Peak Flowrate, Qp = 0.79 cfs NRCS Land Type Heavy Meadow lrllage/ Field Shon Pasture/ Lams Nearly Bare Ground Grassed Swales/ Paved Areas & Shallow Paved Swales fSheet Flowl Conveyan ce 5 10 15 20 2 yr run on OS-2, Tc and PeakQ Peak Flowrate, Qp =------67cfs 8t12t2014,12.37 PM Area-Wei g hti n g for Ru noff Coefficient Calcu lation Project Title: Catchment lD: Rul ison Pre-Developmet Basin A - 25-Year lllustration I.EGM{D: Flm,c Dir€ctim rF-c*fuetr Eouada:r lnstructions: For each catchment subarea, enter values for A and C Area-Weighted Runoff Coefficient (sum CA"/sum A) = 0.37 "See sheet "Design lnfo" for inperviousness-based runoff coefficient values. Runoff-Basin A-PreDevelopment 25-yr storm, Weighted C 811212014,1:31 PM Subarea Area Runoff Product ID acres Coeff. A c*CA input input input outout 3.37 0.37 1.25 3.37 1.25 Project Title: Rulison - Pre-Development Catchment lD: Basin A - 2s-Year l. Catchment Hydrologic Data Catchment lD = A Area = 3.37 Acres Percent lmperviousness = -d.66- % NRCS Soil Type = C A, B, C, or D ll. Rainfall lnformation I (inch/hr) = Cl * Pl (C2 + Td)^C3 Design Storm Return Period, Tr = 25 years Cl = 24.02cz=3cs=--68 P t = -----116- incnes (input return period for design storm) (input the value of C1 ) (input the value of C2) (input the value of C3) (input on+hr precipitation-see Sheet "Design lnfo") CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Runoff Coefficient, C = Overide Runoff Coefficient, C = 5-yr. Runoff Coefficient, C-5 = Overide 5-yr. Runoff Coefficient, C = lll. Analysis of Flow Time (Time of Concentration) for a Catchment oJ5 (enter an overide C value if desired, or leave blank to accept calculated C.) (enter an overide C-5 value if desired, or leave blank to accept calculated C-5.) Calculations: 0.37 lV. Peak Runoff Prediction Rainfall lntensity at Computed Tc, I = 2.15 inch/hr Rainfall lntensity at Regional Tc, I = 2.98 inch/hr Rainfall lntensity at User-Deflned Tc, | = 2.15 inch/hr Peak Flowrate, Qp = 2.69 cfs Peak Flowrate, Qp =3.72 cfs lllustration NRUS LANd Type Heavy Meadow Tillage/ Field Short Paslure/ Lawn s Nearly Bare Groilnd Grassed Swales/ Paved Areas & Shallow Paved SMles (Sheei Flow) Conveyance 2.5 5 7 10 15 20 Runoff-Basin A-PreDevelopment 25-yr slorm, Tc and PeakQ Peak Flowrate, Qp =-26g-'cts 8112t2014,1'.31 PM Area-Wei g hti n g for Ru noff Coefficient Calcu lati on Project Title: Rulison Pre-Development Catchment lD: OS-l - 25-Year lllustration I-EGE{D: FlswDrrettim +-c*fuffi Eouodaay lnstructions: For each catchment subarea, enter values for A and C. Subarea Area Runoff Product ID acres Coeff. A c*CA input input input output Vegetatior 4.90 0.37 1.81 4.90 1.81 Area-Weighted Runoff Coefficient (sum CA/sum l) = 0.37 "See sheet "Design lnfo" for inperviousness-based runoff coefficient values. 25 yr run on OS-1 pre-development, Weighted C 811212014,1:21 PM CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Project Title: Rulison Pre-Development Catchment lD: OS-l - 2s-Year l. Catchment Hydrologic Data Catchment lD = OS-1 Area =-2166-Acres Percent lmperviousness = -6166- % NRCS soil rype =--A, B, c, or D ll. Rainfall lnformation l(inch/hr) = Cl . Pi /(C2 + Td)^C3 Design Storm Return Period, Tr = 25 years (input return period for design storm) C1 = 24.02 (input the value of C1) C2= 5.21 (input the value of C2) C3= 0.759 (input the value of C3) PI= 1.06 inches (input on+hr precipitation-see Sheet "Design lnfo") lll. Analysis of Flow Time (Time of Concentration) for a Catchment RunoffCoefiicient, C = 0.37 Overide Runoff Coefficient, C = _ S-yr. RunoffCoefficient, C-5 = 0.15 Overide 5-yr. Runoff Coefilcient, C = (enter an overide C value if desired, or leave blank to accept calculated C.) (enter an overide C-5 value if desired, or leave blank to accept calculated C-5.) Calculations: lV. Peak Runoff Prediction Rainfall lntensity at Computed 1s, I = 1.32 inch/hr Rainfall lntensity at Regional Tc, I = 2.43 inch/hr Rainfall lntensity at User-Defined Tc, | =Tinch/hr Peak Flowrate, Qp =2.39 cfs Peak Flowrate, Qp =-JTicts Peak Flowrate, Qp = 2.39 cts lllustration NRCS Land Type Heavy Meadow Tillage/ Field snon Pastu rel Lawls Neady Bare Grou nd Grassed Swales/ Wateruavs Paved Areas & Shallow Paved Swales fSheet Flowl Conveyance 5 '10 15 20 25yr run on OS-1 pre-development, Tc and PeakQ 811212014, 1:22 PM Area-Wei g hti n g for Ru noff Coefficient Calcu lation Project Title: Rulison Pre-Development Catchment lD: OS-2 - 25-Year Illustration I-FGE{D: FlowDire*tim*- c*fuffi Bouadry lnstructions: For each catchment subarea, entervalues forAand C Subarea Area Runoff Product ID acres Coeff. A c*CA input input input output veqelailor 2.13 0.37 0.79 2.13 0.79 Area-Weighted Runoff Coefficient (sum CA/sum A) = ;!!| "See sheet "Design lnfo" for inperviousness-based runoff coefficient values' 25-yr OS-2 Pre-Development, Weighted C 811212014,1:24 PM CALCULATION OF A PEAK RUNOFF USING MTIONAL METHOD Proiect Title: Rulison Pre-Development Catchment lD: OS-2 -2s-Year l. Catchment Hydrologic Data Catchment lD = OS-2 Area = 2.13 Acres Percent I mperviousness = -----616- % NRCS soil rype =--A, B, c, or D ll. Rainfall lnformation l(inch/hr) = C1 * Pl (C2 + Td)^C3 Design Storm Return Period, Tr = 25 years (input return period for design storm) C1 = 24.02 (input the value of C1) C2= 5.21 (input the value of C2) C3= 0.759 (input the value of C3) P1= 1 .06 inches (input onehr precipitation-see Sheet "Design lnfo') lll. Analysis of Flow Time (Time of Concentration) for a Catchment Runoff Coetficient, C = 0.37 Overide Runoff Coefiicient, C =(enter an overide C value if desired, or leave blank to accept calculated C.) (enter an overide C-5 value if desired, or leave blank to accept calculated C-5.) Calculations s-yr. Runoff Coefflcient, C-5 = 0.15 Overide s-yr. Runoff Coefflcient, C = lV. Peak Runoff Prediction Rainfall lntensity at Computed Tc, I Rainfall lntensity at Regional Tc, I Rainfall lntensity at UsecDefined Tc, I 2.47 ----1.07 -ffi inch/hr inch/hr inch/hr Peak Flowrate, Qp = 1.94 g1s Peak Flowrate, Qp = 2.42 cfs Peak Flowrate, Qp = 1.94 cfs lllustration NRCS Land Type Heavy Meadow 'Illage/ Field shon Pasture/ Lawlrs Nearly Bare Ground Grassed Swales/ Paved Areas & Shallow Paved Swales (Sheet Flow) Conveyance 2.5 5 7 10 '15 20 c 25-yr OS-2 Pre-Development, Tc and PeakQ 811212014, 1:24 PM Area-Wei g hti n g for Ru noff Coefficient Calcu lation Rulison Post-DevelopmentProject Title: Catchment lD:Basin A - 25-Year lllustration I.IIGE{D: Flsw Direstim +-C*fuest Eoundafr lnstructions: For each catchment subarea, enter values for A and C Area-Weighted Runoff Coefficient (sum CA/sum l) = 0.47 *See sheet "Design tnfo" for inperviousness-based runoff coefficient values. Runoff-Basin A- 25 YR Storm, Weighted C 811212014,1:32 PM Subarea Area Runoff Product ID acres Coeff. c*CA input inout input output Gravel .85 0_51 0.94 o.74 o.37 o.27 2.59 1.22 CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Project Title, Catchment lD: Basin A - 25-Year l. Catchment Hydrologic Data Catchment lD = A Area=755-Acres Percent I m perviousness = -----75- 0-6- % NRcs soit rype =-A, B, c, or D ll. Rainfall lnformation I (inch/hr) = Cl * Pl /(C2 + Td)^C3 Design Storm Return Period, Tr = 25 years (input return period for design storm) Ct = _Ag (input the vatue of C1) C2= 5.21 (input the value of C2) C3= 0.759 (input the value of C3) P1= 1.06 inches (input ons.hr precipitation-see Sheet "Design lnfo") lll. Analysis of Flow Time (Time of Concentration) for a Catchment Runoff Coefficient, C = Overide Runoff Coefficient, C = 5-yr. Runoff Coefficient, C-5 = Overide 5-yr. Runoff Coefflcient, C = 0.47 Calculations: lV. Peak Runoff Prediction Rainfall lntensity at Computed Tc, I = Rainfall lntensity at Reglonal Tc, I =------ZEEinch/hr Rainfall lntensity at User-Defined Tc, I = 2.39 inch/hr (enter an overide C value if desired, or leave blank to accept calculated C.) (enter an overide C-5 value if desired, or leave blank to accept calculated C-5.) 2-39 inch/hr Peak Flowrate, Qp = 2.89 cfs Peak Flo\/rate, ap =_3.Q!cfs Peak Flowrate, Qp = 2.89 cfs 0.30 lllustration NRCS Land Type Heavy Meadow Tlllage/ Field Short Pasture/ Lawn s Nearly Bare Ground Grassed Swales/ Paved Areas & Shallow Paved Swales fSheel Flowl Conveyance 10 15 20 Runoff-Basin A- 25 YR Storm, Tc and PeakQ 811212014, 1:32PM Area-Wei g hti n g for Ru noff Coefficient Calcu lation Project Title: Rulison Post-Development Catchment lD: Basin B - 25-Year lllustration lnstructions: For each catchment subarea, enter values for A and C. Area-Weighted Runoff Coefficient (sum CA,/sum A) =-!!]-*See sheet "Design lnfo" for inperviousness-based runoff coefficient values. Runoff-Basin B-25 YR Storm, Weighted C 811212014,1:33 PM Fl.rw Directim+-- c*fudlt Eouodalr Subarea Area Runoff Product ID acres Coeff. A c*CA input inout input output V ELIEtdIIUI 0.78 0.51 0.40 0.78 0.40 CALCULATION OF A PEAK RUNOFF US]NG RATIONAL METHOD Project Title: Rulison Post-Development Catchment lD: Basin B - 2s-Year l. Catchment Hydrologic Data Catchment lD = B Area =---l7E-Acres Percent lmperviousness =:% NRCS Soil Type = C A, B, C, or D ll. Rainfall lnformation I (inch/hr) = Cl * Pl (C2 + Td)^C3 Design Storm Return Period. Tr = 25ct=---@cz=3cs=-68 Pr= tOO years (input return period for design storm) (input the value of C1) (input the value of C2) (input the value of C3) inches (input one-hr precipitation-see Sheet "Design lnfo") lll. Analysis of Flow Time (Time of Concentration) for a catchment Runoff Coefflcient, C = 0.37 Calculations lV. Peak Runoff Prediction Rainfall lntensity at Computed Tc, I = Rainfall Intensity at Regional Tc, I =------TJTinch/hr Rainfall lntensity at User-Defined Tc, | =---TEE-inch/hr (enter an overide C value if desired, or leave blank to accept calculated C.) (enter an overide C-5 value if desired, or leave blank to accept calculated C-5.) 1.88 inch/hr Peak Flowrate, Qp = _______..lqjgl cfs Peak Flowrate, Qp = 0.74 cfs Peak Flowrate, Qp = 0.54 cfs Overide Runoff Coefficient, C = s-yr. Runoff Coefficient, C-5 = Overide 5-yr. Runoff Coefficient, C = 0.15 lllustration NRCS Land Type Heavy Meadow 'lrllage/ Field Short Pasture/ Lawls Nearly Bare Grou nd Grasse0 Swales/ WateMvs Paved Areas & Shallow Paved Swales (Sheet Flow) Conveyance 2.5 5 7 10 1 20 Runoff-Basin B-25 YR Storm, Tc and PeakQ 811212014, 1:33 PM Area-Wei g hti n g for Ru noff Coefficient Calcu lati on Project Title: Catchment lD: Rulison Post-Development OS-1 - 25-Year lllustration I.Effi{D: F!.Iw Dar€Etioo +- C*[Ctm Ett BouadrSr lnstructions: For each catchment subarea, enter values for A and C. Subarea Area Runoff Product ID acres Coeff. A c*CA inout input input output Veqetatior 3.98 0.37 1.47 3.98 1.47 Area-Weighted Runoff Coefficient (sum CA/sum A) = 0.37 *See sheet "Design lnfo" for inperviousness-based runoff coefficient values. 25 yr run on OS-1, Weighted C 811212014, 1:22 PM CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Project Title: Rulison Post-Development Catchment lD: OS-'l - 2s-Year l. catchment Hydrologic Data Catchment lD = OS-1 Area = 4.90 Acres Percent lmperviorsness =:% NRCS Soil Type = C A, B, C, or D ll. Rainfall lnformation I (inch/hr) = Cl - Pl (C2 + Td)^C3 Design Storm Return Period, Tr = 25 years (input return period for design storm) C1 = 24.02 (input the value of C1) cz=3 (inputthevalueof c2) Ce=-6:m (input the value of C3) P1= 1.06inches (inputonehrprecipitation-seeSheet"Designlnfo') lll. Analysis of Flow Time (Time of Concentration) for a Catchment Runoff Coefficient, C = Overide Runoff Coefficient, C = 5-yr. Runoff Coefficient, C-5 = Overide 5-yr. Runoff Coefficient, C = Calculations: 0.37 0.15 (enter an overide C value if desired, or leave blank to accept calculated C.) (enter an overide C-5 value if desired, or leave blank to accept calculated C-5.) lV. Peak Runoff Prediction Rainfall lntensity at Computed Tc, Rainfall lntensity at Regional Tc, Rainfall lntensity at User-Defined Tc, | = 1.32 inch/hr I = ------l7T inchhrl=Tincnlnr Peak Flowrate, Qp = 2.39 cfs Peak Flowrate, Qp = 4.41 6i5 Peak Flowrate, Qp = 2.39 cfs lllustration NRCS Land Type Heavy Meadow lrllage/ Field Short Pasture/ Lawn s Nearly Bare Ground Grassed Swales/ Paved Areas & Shallow Paved Swales (Sheei Flow) Conveyance 10 15 20 Regional Tc = 25 yr run on OS-1, Tc and PeakQ 811212014,1:23 PM Area-Wei ghti n g for Ru noff Goefficient Calcu lation Project Title: Rulison Post-Development Catchment lD: OS-2 - 25-Year lllustration IFGE{D: rlowDirectim<t- C*fueot Bourrdfl:r lnstructions: For each catchment subarea, enter values for A and C. Area-Weighted Runoff Coefficient (sum CA/sum l) =;!!!- *See sheet "Design lnfo" for inperviousness-based runoff coefficient values. 25 yr run on OS-2, Weighted C 811212014,1:23 PM Subarea Area Runoff Product ID acres Coeff. A c*CA inout input input output Gravel 1.63 0.51 0.83 0.50 0.37 0.19 2.13 1.02 CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Project Title: Catchment lD: l. Catchment Hydrologic Data Catchment lD = OS-2 Area =.........7ilrAcres Percent lmperviourn"rs =.@% NRCS Soil Type = C A, B, C, or D ll. Rainfall lnformation I (inch/hr) = Cl - P1 /(C2 + Td)^C3 Design Storm Return Period, Tr = C1 = C2= C3= Runoff Coefflcient, C = Overide Runoff Coefficient, C = 5-yr. Runoff Coefficient. C-5 = Overide 5-yr. Runoff Coefficient, C = years P1= 1.06 inches 25 24.02 - o759 (input return period for design storm) (input the value of C1) (input the value of C2) (input the value of C3) (input on+hr precipitation-see Sheet "Design lnfo") lll. Analysis of Flow Time (Time of Concentration) for a Catchment (enter an overide C value if desired, or leave blank to accept calculated C.) (enter an overide C-5 value if desired, or leave blank to accept calculated C-5.) lllustration 0.48 0.31 Calculations: lV. Peak Runoff Prediction Rainfall lntensity at Computed Tc, I = 2.74 inchlht Rainfall lntensity at Regional Tc, | = -----T67 inch/hr Rainfall lntensity at User-Defined Tc, | =--72-inchlhr Peak Flowrate, Peak Flowrate, Peak Flowrate, Qp = 2.za cfs Qp = 3.11 cfs Paved Areas & Shallow Paved Swales Regional Tc = User-Entered Tc = 25 yr run on OS-2, Tc and PeakQ Qp = z.7a cfs 811212014,1:23 PM Area-Wei g hti n g for Ru noff Coefficient Calcu lation Project Title: Gatchment lD: Rulison Pre-Developmet Basin A - 100-Year lllustration r.lr(s{D: Flow Directim C*dmstr Bouoda:r lnstructions: For each catchment subarea, enter values for A and C. Area-Weighted Runoff Coefficient (sum CA/sum l) = 0.50 *See sheet "Design Info" for inperviousness-based runoff coefficient values. Runoff-PreDevelopment 1 00-yr storm, Weighted C 811212014,2:02 PM Subarea Area Runoff Product ID acres Coeff. A c*CA input input input output 3.37 0.1. 3.37 1.69 CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Project Title: Rulison - Pre-Development Catchment lD: Basin A - 100-Year ll. Rainfall lnformation I (inch/hr) = C'l * Pl /(C2 + Td)^C3 Design Storm Return Period, Tr =1 00 years l. Catchment Hydrologic Data Catchment lD = A Area=TAcres Percent lmpervior.n".. =:% NRCS Soil Type = C A, B, C, or D C1 = 24.02cz=------frcs=--68Pt=-Tliiinches (input return period for design storm) (input the value of C1 ) (input the value of C2) (input the value of C3) (input on+hr precipitatron-see Sheet "Design lnfo") lll. Analysis of Flow Time (Time of Concentration) for a Catchment Runoff Coefficient, C= 0.50 Overide Runoff Coefficient, C = _ (enter an overide C value if desired, or leave blank to accept calculated C.) 5-yr. Runoff Coefficient, C-5 = 0.15 Overide 5-yr. Runoff Coefficient, C = _ (enter an overide C-5 value if desired, or leave blank to accept calculated C-5.) lllustration Calculations: lV. Peak Runoff Prediction Rainfall lntensity at Computed Tc, Rainfall lntensity at Regional Tc, Rainfall lntensity at User-Defined Tc, I = 2.52 inchlht | = ------llEE- inchrnrl=-...Eincunr Peak Flowrate, Qp = 4.24 cfs Peak Flowrate, Peak Flowrate, Qp = o.ss cfs Qp = +.zq cfs NRCS Land Type Heavy [,4eadow Illage/ Field Short Pasture/ Lartms Nearly Bare Ground Grassed Swales/ Paved Areas & Shallow Paved Swales lSheei Flow) Conveyance 2.5 5 7 10 '15 20 Runoff-PreDevelopment 100-yr storm, Tc and PeakQ 811212014, 2:02 PM Area-Wei g hti n g for Ru noff Coefficient Calcu lation Project Title: Rulison - Pre-Development Catchment lD: OS-l - 100-Year lllustration IEffi{D: Flow Directim*-- C*fueryt Bouodalr lnstructions: For each catchment subarea, enter values for A and C Subarea Area Runoff Product ID acres Coeff. A c*CA input inout input output Veqetatior 4.90 0.50 2.45 4.90 2.45 Area-Weighted Runoff Coefficient (sum CA/sum A) = 0'50 *See sheet "Design lnfo" for inperviousness-based runoff coefficient values. 100 yr run on, Weighted C 811212014,2:15 PM CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Proiect Title: Rulison - Pre-Development Catchment lD: OS-1 - 100-Year l. Catchment Hydrologic Data Catchment lD = OS-1 Area = 4.90 Acres Percent lmperviorsness = : % NRCS Soil Type =__g A, B, C, or D ll. Rainfall lnformation I (inch/hr) = Cl * Pl /(C2 + Td)^C3 Design Runoff Coefficient, C = Overide Runoff Coefficient, C = 5-yr. Runoff Coefficient, C-5 = Overide s-yr. Runoff Coefficient, C = Storm Return Period, Tr = 100 C1 = 24.02cz=77cg=-68 Pr=------16 years (input return period for design storm) (input the value of C1 ) (input the value of C2) (input the value of C3) inches (input one-hr precipitation-see Sheet "Design lnfo") lll. Analysis of Flow Time (Time of Concentration) for a Catchment 0.16 (enter an overide C value if desired, or leave blank to accept calculated C (enter an overide C-5 value if desired, or leave blank to accept calculated Calculations: IV. Peak Runoff Prediction Rainfall lntensity at Computed Tc, I = 0.51 c-s.) 2.54 inch/hr Rainfall lntensity at Regional Tc, I =------Sl6Eincnlrrr Rainfall lntensity at User-Defined Tc, | =----TEZ-inch/hr Peak Flowrate, Qp = 6.31 cfs Peak Flc)\ /rate, Qp = g.oo cfs Peak Flowrate, Qp = 6.31 cfs lllustration NRCS Land Type Heavy Meadow lrllage/ Field Short Pasture/ Lawns Nearly Bare Ground Grassed Swales/ WateMaYs Paved Areas & Shallow Paved Swales /Sheei Flowl Conveyance 5 10 '15 1 00 yr run on, Tc and PeakQ 811212014,2:15 PM Regional Tc Area-Wei g hti n g for Ru noff Coefficient Calcu lati on Project Title: Rulison - Pre-Development Catchment lD: OS-2 - 100-Year lllustration IFM{D: Florv Directim*-- C*Ctrn srf Bou[dtry lnstructions: For each catchment subarea, enter values for A and C. Area-Weighted Runoff Coefficient (sum CA/sum l) = 0.50 *See sheet "Design lnfo" for inperviousness-based runoff coefficient values. 100-yr OS-2 Pre-Development, Weighted C 811212014,2:08 PM Subarea Area Runoff Product ID acres Coeff. A C-CA input input input output 213 7 2.13 1.07 Solo'""1 CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Project Title: Rulison - Pre-Development Catchment lD: OS-2 - 100-Year l. Catchment Hydrologic Data Catchment lD = OS-2 Area=TJTAcres Percent I mperviorsness = ].@ % NRCS Soil Type = C A, B, C, or D ll. Rainfall lnformation I (inch/hr) = Cl - Pl /(C2 + Td)^C3 Design Storm Return Period,Tr=100 years U = Zq.O2cz=3cs=-676 Pt = ---l7E inches 0.50 (input return period for design storm) (input the value of C1 ) (input the value of C2) (input the value of C3) (input one-hr precipitation-see Sheet "Design lnfo') Runoff Coefficient, C = Overide Runoff Coefficient, C = 5-yr. Runoff Coefficient, C-5 = Overide s-yr. Runoff Coefficient, C = lll. Analysis of FIow Time (Time of Concentration) for a Catchment 0.1 5 (enter an overide C value if desired, or leave blank to accept calculated C.) (enter an overide C-5 value if desired, or leave blank to accept calculated C-5.) Calculations: lV. Peak Runoff Prediction Rainfall lntensity at Computed Tc, | = 3.37 inch/hr Rainfall lntensity at Regional Tc, I = 4.19 inch/hr Rainfall lntensity at User-Detined Tc, I =..Tincn/hr Peak Flowrate, Qp = a.sg Peak Flowrate, Qp -- 4.47 Peak Flowrate, Qp = 3.59 cfs cfs cfs lllustration '100-yr OS-2 PreDevelopment, Tc and PeakQ 811212014.2:09 PM Area-Wei g hti n g for Ru noff Coefficient Calc u lation Rulison Post-Development Basin A - 1O0-Year lllustration lnstructions: For each catchment su barea, enter values for A and C. Area-Weighted Runoff Coefficient (sum CA/sum A) = 0.59 *See sheet "Design Info" for inperviousness-based runoff coefficient values. Project Title: Catchment lD: Runoff-Basin A- 100 YR Storm, Weighted C 811212014,1:47 PM FlswDif€stim C*fuEtr Eouuday Subarea Area Runoff Product ID acres Coeff. A CA inout input input output A 2.59 o.5s 1. 2.59 't _53 CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Project Title: Catchment lD: l. Catchment Hydrologic Data Catchment lD = A Area = 2.59 Acres Percent lmperviousness =:l!qg% NRCS Soil Type = C A, B, C, or D ll. Rainfall lnformation I (inch/hr) = a1 Design Storm Return Period, Tr= 100 years Cl = 24.02cz=-'Rcs=-675e- P1=......fr'incnes * P1 llc2 + Td)^c3 (input return period for design storm) (input the value of C1 ) (input the value of C2) (input the value of C3) (input on+hr precipitation-see Sheet "Design lnfo') Runoff Coefficient, C = Overide Runoff Coefficient, C = s-yr. Runoff Coefflcient, C-5 = Ovende s-yr. Runoff Coefficient, C = lll. Analysis of Flow Time (Time of Concentration) for a Catchment (enter an overide C value if desired, or leave blank to accept calculated C.) (enter an overide C-5 value if desired, or leave blank to accept calculated C-5.) 0.37 lllustration Calculations lV. Peak Runoff Prediction Rainfall lntensity at Computed Tc, I = 3.45 inch/hr Rainfall lntensity at Regional Tc, I =-1,-6E-inch/hr Rainfall lntensity at UseGDefined Tc. I =..............Einch/hr Peak Flowrate, Qp =5.29 cfs Peak Flowrate, Qp =---T76cts Peak Flo^/rate, Qp = 5.29 cfs NRCS Land Type Hea!ry Meadow Illage/ Field Short Pasture/ Lawn s Nearly Bare Ground GTASSEd Swales/ WateMavs Paved Areas & Shallow Paved Swales (Sheet Flow) Conveyance 2.5 5 7 10 '15 20 Regional Tc = Runoff-Basin A- 100 YR Storm, Tc and PeakQ 8t12t2014,1 48PM Area-Wei g hti n g for Ru noff Coefficient Calcu lation Project Title: Catchment lD: Rulison Post-Development Basin B - 100-Year lllustration I-Effi\ID: ElswDirestim +-C*fuest Bouadafr lnstructions: For each catchment subarea, enter values for A and C Area-Weighted Runoff Coefficient (sum CA/sum l) = 0.50 *See sheet "Design lnfo" for inperviousness-based runoff coefficient values. Runoff-Basin B- 100 yr, Weighted C 811212014,1:49 PM Subarea Area Runoff Product ID acres Coeff. A CA input rout inout outout .78 0.50 0.39 o.78 0.39 CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Project Title: Catchment lD: Basin B -'100-Year l. Catchment Hydrologic Data Catchment lD = B Area =-6J5-Acres Percent lmperviousness = ...1!Q! % Design Storm Return Period, Tr = 100 years Cl = 24.02cz=3 cs=-675e--Pt=Tincnes NRCS Soil Type =CA,B,C,OTD ll. Rainfall lnformation I (inch/hr) = Cl . P1 /(C2 + Td)^C3 Runoff Coefficient, C = Overide Runoff Coefficient, C = S-yr. Runoff Coefficient. C-5 = Overide S-yr. Runoff Coetficient, C = (input return period for design storm) (input the value of C1 ) (input the value of C2) (input the value of C3) (input on+hr precipitation-see Sheet "Design lnfo") 4.12 inch/hr Peak Flowrate, Qp =1.61 cfs lll. Analysis of Flow Time (Time of concentration) for a Catchment 0.1 5 (enter an overide C value if desired, or leave blank to accept calculated C.) (enter an overide C-5 value if desired, or leave blank to accept calculated C-5.) Calculations: 0.50 lV. Peak Runoff Prediction Rainfall lntensity at Computed Tc, Rainfall lntensity at Regional Tc, Rainfall lntensity at User-Defined Tc, l=-."......7inch/hr l=----77inch/hr Peak Flowrate, Op =-lEZcts t= lllustration NRCS Land Type Heavy Meadow lrllage/ Field Snon Pasture/ Laffis Nearly Bare Ground Grassed Swales/ Paved Areas & Shallow Paved Swales (Sheet Flow) Conveyan ce 2.5 5 7 10 15 20 Regional Tc = User-Entered Tc = Runoff-Basin B- 100 yr, Tc and PeakQ Peak Flowrate, ap =---TGTcrs 8t12t2014. 1 49 PM Area-Wei g hti n g for Ru noff Coefficient Calcu lation Rulison Post-Development OS-1 - 100-Year lllustration lnstructions: For each catchment subarea, enter values for A and C. Subarea Area Runoff Product ID acres Coeff. A c*CA input input input output vegelaltor 4.90 0.50 2.45 4.90 2.45 Area-Weighted Runoff Coefficient (sum CA/sum A) =-!!Q-*See sheet "Design lnfo" for inperviousness-based runoff coefficient values. Project Title: Catchment lD: 100 yr run on OS-1, Weighted C 811212014,1:50 PM I-Effi{D: Flow Direstim{- CfifuqT Eouada:r CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Project Title: Catchment lD: l. Catchment Hydrologic Data Catchment lD = OS-1 Area =-ZlE6-Acres Percent lmperviorrnesr = : % NRCS Soil Type = C A, B, C, or D ll. Rainfall lnformation l(inch/hr) = Cl " Pl /(C2 + Td)^c3 Runofi Coefflcient, C = Overide Runoft Coefficient, C = s-yr. Runoff Coefficient, C-5 = Overide 5-yr. Runoff Coefficient, C = Design Storm Return Peflod, Tr = 100 years C1 = 24.02cz=3 cs=---6.76 P1=Tinches (input return period for design storm) (input the value of C1 ) (input the value of C2) (input the value of C3) (input one-hr precipitation-see Sheet "Design lnfo') 1.80 inch/hr Peak Flowrate, QP =4.42 cfs Peak Flowrate, Ap =------5Fcfs Peak Flowrate, Qp = 4.42 cfs lll. Analysis of Flow Time (Time of Concentration) for a catchment 0.1 5 (enter an overide C value if desired, or leave blank to accept calculated C.) (enter an overide C-5 value if desired, or leave blank to accept calculated C-5.) lllustration Calculations 0.50 lV. Peak Runoff Prediction Rainfall lntensity at Computed Tc, I = Rainfall lntensity at Regional Tc, I =------llTinch/hr Rainfall lntensity at User-Defined Tc, | =7E6-inchlhr NRCS Land Type Heavy Meadow Illage/ Field Short Pasture/ Lams Nearly Bare Ground GTASSEd Swales/ WateMavs Paved Areas & Shallow Paved Swales (Sheet Flow) Conveyance 2.5 5 10 15 20 '100 yr run on OS-1 , Tc and PeakQ 8t12t2014, 1.50 PM 7 Area-Wei g hti n g for Ru noff Coefficient Calcu lati on Project Title: Catchment lD: Rulison Post-Development OS-2 - 1OO-Year lllustration lnstructions: For each catchment subarea, enter values for A and C. Area-Weighted Runoff Coefficient (sum CA/sum A) = 0.57 *See sheet "Design lnfo" for inperviousness-based runoff coefficient values. 100 yr run on OS-2, Weighted C 811212014,1:51 PM Elsw Directim 1-- C*fueqt Eourda:r Subarea Area Runoff Product ID acres Coeff. A CA inout inout inout output Gravel 1.63 0.59 0.96 v ErtEtaUUr 0.50 0.50 o.25 2.13 1.21 Sdoefi*e 1- CALCULATION OF A PEAK RUNOFF USING MTIONAL METHOD Proiect Title: Rulison Post-Development Catchment lD: OS-2 - 100-Year l. Catchment Hydrologic Data Catchment lD = OS-2 Area =2.13 Acres Percent lmperviorsn"tt = .@ % NRCS Soil TYPe =CA,B,C,OTD ll. Rainfall lnformation Design Storm Return Period, Tr = - P1 l(C2 + Td)^C3 (input return period for design storm) (input the value of C1) (input the value of C2) (input the value of C3) (input on+hr precipitation-see Sheet "Design lnfo") I (inch/hr) = Cl 199 years Cl = 24.02 vz= a.z tcs=----lE Pt = -----T7E inches 0.57 Calculations: lV. Peak Runoff Prediction Rainfall lntensity at Computed Tc, I =3.74 inch/hr Rainfall lntensity at Regional Tc, I =-----7lE-inch/hr Rainfall lntensity at User-Defined Tc, | = 3.74 inch/hr Runoff Coefflcient, C = Overide Runoff Coefficient, C = 5-yr. Runoff Coefficient. C-5 = Overide 5-yr. Runoff Coefficient, C = lll. Analysis of Flow Time (Time of Concentration) for a Catchment (enter an overide C value if desired, or leave blank to accept calculated C.) (enter an overide C-5 value if desired, or leave blank to accept calculated C-5.) lllustration Peak Flowrate, Peak Flowrate, Peak Flowrate, Qp =______ :!r53 cfs Qp = 5.08 cfs NRCS Land Type Hea!ry Meadow Tillage/ Field Short Pasture/ Lams Nearly Bare Ground Grassed Swales/ WateNavs Paved Areas & Shallow Paved Swales (Sheet Flow) Conveyance 2.5 7 10 15 20 100 yr run on OS-2, Tc and PeakQ Qp = a.53 cfs 8112t2014, 1.51 PM o31 Swale Section A-A {OO-Year Gonveyance Manning Formula Normal Depth Friction Method Solve For Downstream Depth Length Number Of Steps Upstream Depth Profile Description Profile Headloss Downstream Velocity Upstream Velocity Normal Depth Critical Depth Channel Slope Critical Slope lnput Data Roughness Coefficient Channel Slope Left Side Slope Right Side Slope Discharge Results Normal Depth Flow Area Wetted Perimeter Hydraulic Radius Top Width Critical Depth Critical Slope Velocity Velocity Head Specific Energy Froude Number Flow Type 0.030 0.04120 'tl/ft 2.64 fVft (H:V) 8.17 fVft (H:V) 5.29 ft"/s 0.50 ft 1.35 fl2 5.52 ft 0.24 ft 5.40 ft 0.57 ft 0.02054 fi|ft 3.93 fUs 0.24 ft 0.74 ft 1.39 a Supercritical 0.00 ft 0.00 ft 0 0.00 ft 0.00 ft lnfinity fUs lnfinity fVs 0.50 ft 0.57 ft 0.04120 tuft 0.02054 fufi Bentley Systems, lnc. Haestad Methods SolBSodqdbf,Master V8i (SELECTseries 1) [08.11.01'031 811212014 2:40:26 PM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 Page 1 of 1 Swale Section B-B { OO-Year Gonveyance Manning Formula Normal Depth lnput Data Friction Method Solve For Roughness Coefficient Channel Slope Lefl Side Slope Right Side Slope Discharge 0.030 0.07584 ft|fi 2.00 fuft (H:V) 2.00 fUft (H:V) 4.42 ft"/s Normal Depth Flow Area Wetted Perimeter Hydraulic Radius Top Width Critical Depth Critical Slope Velocity Velocity Head Specific Energy Froude Number Flow Type GVF lnput Data Downstream Depth Length Upstream Depth Profile Description Profile Headloss Downstream Velocity Upstream Velocity Normal Depth Critical Depth Channel Slope Critical Slope o.62 0.76 2.76 0.28 2.47 0.79 0.02076 5.79 o.52 1.14 1.84 ft ft" ft ft ft ft ftifi fUs ft ft 0.00 ft lnfinity fUs lnfinity fUs 0.62 ft 0.79 ft 0.07584 fufi 0.02076 fuft Number Of Steps Bentley Systems, lnc. Haestad Methods SolBtiod4fraMaster V8i (SELECTseries 1) [08.11.01.031 811212014 2:41:45 PM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +'l -203'755'1666 Page 1 of 1 Supercritical l OO-Year Spillway Crest Length lnput Data Discharge Headwater Elevation Crest Elevation Tailwater Elevation Crest Surface Type Crest Breadth Crest Length Headwater Height Above Crest Tailwater Height Above Crest Weir Coefiicient Submergence Factor Adjusted Weir Coefficient Flow Area Velocity Wetted Perimeter Top Width 4.50 ft 10.31 ft 0.50 ft -6686.00 ft 2.69 US '1.00 2.69 US 5.16 ft2 1.S0 fVs 11.31 ft 10.31 ft 9.82 ft"/s 6686.50 ft 6686.00 ft 0.00 ft Gravel BentleySystems, lnc. HaestadMethodsSolB6od4frrMasiervSi (SELEcTseriesl) [08.11.01'031 811212014 2:37t10 PM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1 -203-755-1666 Page 1 of 1 DETENTION VOLUME BY THE MODIFIED FAA METHOD Rulison orcalchrcntslessthanl60acre.only. Forlatgercatchrents,usehydrograph.outingretho {NoTE: tor catchmnts larger than 90 acre., CUHP hydrograph and routing arc recomrended) O€termination o, MINOR D€tention Volurc Using Moditied FAA Method Determination ol MAJoR Detention Volurc Using Moditicd FAA Method c&hm.ntOdn4€ lmp.Mousnoss CdchmedOrdnag. Arca Predevelopment NRCS Soil Group R.Em Peiod lorOct.don Contol Tim. oI Corcentdon ofWdereh.d Allow*le UntRel€Ge Re Ondou Prcciptdon O.rlgn &lnEll IDF Formula I 3 ci Py'(cr+TJ^c! C orD (2,5 10.25,50,or100) cr c1 C&hm€ntDdn4e lmpcMousness CfthmedDrdnago Area Prcdevelopment NRCS So I Gro4 Retum P.nod fd D.t.nton Connol Tim€ of Corc€ntdon ofWdeEhed Allow&le htRel.66 Rde One+ou Precipitdon O€slgn tulnEll loF Formul. I . ci P!I(Cr+TJ^c! coefiiciedo* cr = 24.42 coetrci!ilIwo c,= .. ..... I . coeffioentThree C: = 0.759 l. =_.... . 290{ ____ _ p.rccd A= .2:5-_9,.0........*rcs TD€= C A.B.C orD' r =[ x ---ly.* t2. s. 10.2s 50 or loo, i Runofico.triciont c=.......9,?2_. ldow P.*Runofl Opin = - --- -0 69.--- - -,. cls AllodlePeakoffiowRde Op{(..,......qr9. ds Md.FMtlnorSbrag.volume. 117 cublcht td. FM Mlnor Storagevolurc ' 0.003 act.d ----rc -_-.- er* q,"rdrDl,aon rn.'emenrd r-"'"*" vd,. F";; i; ;. ! ;"ii-uq Ru.off coeflbi.d a = ... ...0..47.. ldowPe6kRunotr OPrn= --.--2's cls Ailowele Peakodow Rdo oN(. . . l,!9 - - cfs Mod. FM taior Siotaqc Volum.' 523 ,- .,..-. cublc tet Mod. FS ilaior SbIege Vdum' 0.014 elc-t Durdon Ranldl Ouflow Odlow Slorage Rdnfdl Dwdon Storag. 0.00 t1,C9 0J1 97e 9.72 . 9,6! 0.64 0.62 091 9.q9 0.59 0.!6 ..9..51.. 0.57 0,iq f,i6 0.1!0s 9,95.qqi gs1 _0.54. q51 0.54 og .9,:9. 0.53 . 0.51 0!3 0.99 q,!1. 9S1 9.53 9,91 9,t? q,!2 .012 q.5? 0.52 0.52 9.t2 . .9.33. 0.5? . 0.12 o:52 0.5? 9,?? 9.9? . 9..5? 0.52 c,!? 9,!? 9,s? 0,q? .0.!1 9.?2 0.52 c,91 o5l 0.51 9.09 959 q,61 0.5J 049 I46 0.44 9,19 9,1? 941 0.40 0.19 m9 9,!9, 0?9 9.38 0.38 03q .0,1!g,!! 9.37 !!7 .9,?7. 9,3I .o:37.9r. o-37. 0,32 0 31. 0.36 9.19 0.36 0.36 0?9 g,9q 9,19 0.36 939 039 qq9 0.36 9,!6 q.39 936 9,16 0,i9 9,19 0_36 c!g 9 36. 0.36 0.36 . 0,39 0.36 0.36 019 0.39 0.35 0.1! 0.35 0.35 0 19 ?o 30 .!.0. i9 60 79 .. !q s9 1.09 1 t.s ..1.40. . -1.!0,. 11q 19q 199 119 ...1.90 . .199, 299.. .?19-. ?-29 239 ...2J9.. 290 290''. ..?r0. . -249. ?99 90.9.. 119 l?C , 199 .3!0 . 3sq 399 370 ,199 . 390 400 .. !.10 ,29 .. !39 ..1!9.. 15q !6]. !79 1!0 ,.199 !09 i19 . .5r,9 . !19 . 549 . !!9. 999 !70 580 999 600 .l o.oo 155 0.82 _0 68 0,58 0.51 0.46 0_42 0.39 0.36 0.33 . 03.1 0.30 028 o-27 0.25 9.24 923 0_22 0.22 . o.?1 0.20 0.19 o 19 0.1 I 0.18 . . 0.17 a-17 0.1 6 019 0.16 0.1 5 0.1 5 0.15 014 0ta 0.14 . 91! 013 0.13 0.1 3 0.1 2 0.1? 012 a_12 4.12 911 0.11 011 0.1 1 q,11 9,11 _ 010 0.1 0 010 0.10 0.1 0 q,1q 0.1 0 0.09 g 909 0.01 2 0.01 7 0-01 I 0.021 9.9?i 0.024 q,c?! q,9m 9,927 0.028 0.9?9 0s9 9,990. 0.031 0.031 0.032 0_032 ,,9.,911. 0.033 9 93j 9,9!4 9.93s 0-035 0 035 . 0..0s .9 039 0,.037 0.037 0.091 .09q0 0..9q9 0.038 0.038 . 0.99e c,c19 0.039 q,q19 0919 . 0.040 0.040 9,911 q.941. 0 941 0-041 o,9a? 9.042 0.042 9,91? 9,01?.. 0,q11 I.943 .0q13 q311 0.043 9 9.41 9,911 0.044 9.04.4 9 9!! 0.045 0.000 i 0.000 0.009 : 0.003 0.018 : 4.001 ..0.9:?? . :, .{,993..0.027 {.006 o.oii l {.ooe 0.037 : {.012 0.041 ! {.0166d;6 i n;.or:i'.oo5r - I nt,i' 9gsq . .:.. ,92q0.060 : 4.032 0.065 i {.036 0.070 i {.040 q,91i. .t .{,911 9 97s t "..olq .0.084 , {.052 9,99e .: {956 9,991,,,,,,,r,,....1,991 .9.99.... I 4tr1. 0.103 {.069 ..9,19?. .: ..4.971. 9,t119 .i. ..J,92!0.117 ! {.082 .9,12 . .)....9.,98! o-.1?1... .t .a.0910.132 I {.095 0.136 i {.100 0.141 i {.104 0,1119,, .. r......!.1!e0.151 I {.1130.155 4.117 ..0,1.99 .... i !.1?2 9,161 : .{,1?60.169 | {.r31 .9,.1!.!.......) 4ls 9,119 i .{,119 .9,1.81 t. 4111 g.lqq .i ...1,119.0_193 i {.153 0.198 I {.158 0.203 I a.roz0.207 {.167 9.21? .. : ...4.11.1 9,21 . ....::....!)190.222 ! 4.1E0t;r6 I r.ras 9'?31 . r 1,1q90.236 ! {.1S 0:211 | o.ria 9,21i j {:203 0.250 I 4-207o.raa i q.z:) 0.260 | 4.216 9:26 .a . :. .1:2210.269 i {.225diii' ' 'i-- ni.zin 0-279 {.235 9.?qq I .a 23,9 0.?q9 l. .!,2!10.293 ! {.248 9.12 0.40 0.39 0,19 037 9,39 9,15 0.34 0.33. s!? 0.!2 931 0?g 930 929 928 02q 0-27 0.27 029 0_26 0.25 925 9.24 a-24 9?4 0.21 02! 0.23 9.?2 022 922 0.21 021 a?1 0.20 0.24 0.20 0.20 0.000 0.054 0.97! 0.0a5 0.095 I 10? 0.1 08 0.113 0.117 0.1 21 0.12.5 0.128 9,1!1. 0.134 0.137 0.139 0 142 0.1 4ra 0.146 I 198 0.150 o,is1 0_156 0.157 0.1 59 0.1 61 q,19? 0,191 0.1 65 0.1!z I 1!q 0,19e 0.171 4.172 9,173 0 17! 0 11! 0-177 0.17E 0.1 79 .o-,le 9,1 E1 0 182 q,169 0.144 0.1 E6 0.1 87 0.1E7 q.1E9 0.189 0.190 0.1 91 0.192 0.193 0.194 0.1 95 0.1s 0.197 0.197 0.198 030 3.23 2.24 1.71 1_41 1.21 1.O7 0.96 0.87 : 0.80 0.74 0.69 0.65 0.61 : 0.58 0.55 0.53 0,50 q48 : 0.46 0.45 0,4! I 0 10 20 30 19 50 60 70 60 90 109 110 120 11q 140 1!9 160 170 190 19q ?90 ?19 229 230 249 ?!9 269 270 28q 2e9 390 310 329 330 340 3-50 !90 31q 390 390 400 419 420 130. ..!49. 1!9 460 470 480 _ 490 ?00 !10 520 s99 549 q?q !60 570 589 q90 600 o ooo o.0oo Io.o4o 0.014 I9,Ci1 o ooo Iooga {oo8 I o r14 {.019 I 0.134 493 I0.154 { 046 I0.173 4961 I o 19! . :9,919 I0.213 , a,99? I0.233 {,109 | o 253 . {.125 I 9,271 .. 4.142 I o 2s1 , 4,1.19 I0.313 {,179 I o ql1 .{,!93 I0.352 4-211 I6stz 4.22a I 9.3e . ,,,,.. . {29 I o a12 4:264 I0.432 4:292 |q1!? .......4,!99 Iot72 {318 I 0 492 {.336 I0.512 l.1lt I0.531 4-3!2 | o s51 {.391 I o 571 {.40e ] o q91 | 4:127 0,611 : {,446eili i n41 9.9i1 r 961 0.671 I {.501 o,6ai -- :- n.t o' .0,!19 1.. {9!q 0.730 {.557 nz-+. 1- f,9;a 0.770 I {,591 0.790 {.613-!.pi6 -i nw 0.630 {.651 0.850 : 4.S9 g.drc i o!9a 0.689 i {.707 i,.!tdt- i 4126-o,ris l. n-ii{ 9,91-9,, i.. -1,2qi..0.969 : 4-7a2 ri.ii6s : n-s 1,9-0.! .. I .,. .-{-.620,. .1.029 i {.839 1,919 ' { s99 1,999 i.. j|7 -1.0Eq {,9s l.1qq | -9.s!9 1.128 _l .,1,9.91 1,1'!9 .: {,9i1 . 1.168 I {.972 1.1E8 i {.991 !:oq -- ; r.orii' 1.22E i -1.029 0.00 1,09 0.e1 0_79 9.72 0.67 0.04 0.62 0.61 960 g,5e 0.5q 0- a 5.1 9!6 956 095 0.55 95sIti 0ql 0!1 0.54 0.54 054 9.53 0.53 0.5! 0.53 0.!3 0.13 0.53 9!i 0.53 0.5J 0!? 99? 0.52 9.5? 4.52 0.52 0,5? o-52 0.52 012 4.52 9.32 9,52 9s2 9.!2 0.52 0.5? 0.52 042 .0.52 9.52 0.52 0-51 q,!1 0.51 0.00 ?9e 269 2.27 2_07 1.94 1.86 1.80 1_75 1-72 169 1.67 1.65 1-64 1.62 1.61 1.60 1.59 15! 1.57 1.57 1.56 1.56 1.55 1.55 1q4 154 1.54 1.53 1.53 15? 1.52 1.52 1.52 15? 151 1.51 1.51 1.50 1.s0 1.50 .l 50 1.50 1.50 1.50 1.50 14e 1.49 1.49 1.49 1.49 r.49 1.49 1.49 1.49 1.49 1.49 1.49 Mod. FM M lnot Sbrage vdum. (cubE n) - 117 il od, FM Mlnor Sbr.gc VolumG lacre-t) = 0.0027 ,od. fM Ma,or Sbragevdume {cublc t). Md. FM Malor sbl.s€ Volum. (acI!-t) =0.ota3 atlnofi,zzE ?BUD-Debnton-v2.3, Modfr 6d FAA UDFCD OETENTION BASIN VOLUME ESTIMATING WORKBOOK VETS|ON 2.34, REhASEd NOWMbET 2013 DETENTION VOLUME BY THE MOOIFIED FAA METHOD Noble Rulison Basin lD: Basin A lnflow and Outflow Volumes vs. Rainfall Duration a 0.8oo o o6 o E: 06o o 'r0o 200 300 400 500 600 Duration (Minutes) -frc.iomotuv&m. o hn.r3bdno.{.vdum. +htsrsbrmlntuvem -hFlbrmotuvoEN . hprsbr6sr.c.v&d ,/ ,/ ,/--'-P :- UDo6bnton-€-34, Modfr 6d FAA UDFcD DETENTION BASIN VoLU[rE ESTIMATING WoRKBooK Version 2.34, Released November 2013 al12no11 228 PM POND INFI LTRATION COMPUTATION Project: Noble Rulison Date: 8.12.2014 This calculation finds the infiltration rate and drainage time based upon the soil type, area, and volume of the pond. SoilType: C lnfiltration Rate: 0.50 lnches Per Hour, lnfiltration Area: lnfiltration Flow Rate : Pond Storage Volume: 73L.40 Square Feet Cubic Feet Per Second 623.00 Cubic Feet Time to Drain: 20.44 Hour(s) 1)"Table RO-7." Droinoge Criteria Monuol. Denver, CO: Urban Drainage and Flood Control District,2001. RO-22. STAGI SIORAGI TABLT ELE V ARIA (=q. ft ) CONIC INC. VOL. (.r.ft.) CONIC TOTAL VOL. (.u. ft ) 6683.0 49.1 N/A 0.0 6684.0 190.4 112.1 112.1 6685.0 417.9 296.8 408. g 6686.0 731.+567.4 976.3 Narw$mu*m WmwN $muumrutmu..y & Mm*"rux6wmwmt W$xxn Nm$x$m ffirxmrgy ffi u* X I scpm txxye$cxw-rm Vmre$ #wrflr*dN ffinwmdy, #CIdurmder Prepared by: ///6_L,r/'' - if Lilly Griffin, Range Ecologist I Supporting Scientist Olsson Associates 760 Horizon Drive Suite 102 Grand Junction CO 81506 TEL970.210.4328 | FAX 970.263.7456 lg riffi n @olssonassociates.com www. olssonassociates.com OLSSON* O.L,I59^tlY August LL,2ot4 Noxious Weed lnventory & Management Plan Noble Energv - Rulison Lavdown Yard Garfield County, Colorado Prepared for: Garfield County Vegetation Management 0375 County Road 352, Bldg.2060 Rifle, CO 81650 Prepared by: Lilly Griffin, Range Ecologist I Supporting Scientist Olsson Associates 760 Horizon Drive Suite 102 Grand Junction CO 81506 TEL 970.210.4328 | FAX 970.263.7456 lg riffi n@olssonassociates.com www. olssonassociates. com Mike Bonkiewicz, Operations Manager Noble Energy lnc. 800 Airport Rd, Rifle, CO 81650 m bonkiewicz@ nobleenergy.com 970-381-5 Weed lnventory, Rulison Laydown Yard OLSSON. a 5 s o c r ar E s August LL,201,4 Table of Contents 1". PROJECT DESCR|PT|ON................ ............1 1.1. Description of Analysis Area .......... .................... 1 1.2. Photos of Dominant Vegetation Community Types .............2 2. RESULTS OF SURVEY EFFORTS..... ............3 2.1. Figure 1: Noxious Weed Map ........... .................4 2.2. Noxious Weed lnventory Spreadsheet................. ................5 3. NOXIOUS WEED MANAGEMENT PLAN..... ..,..............5 4. SEED MrX RECOMMENDATTON ...............5 APPENDIX A- COLORADO LISTED NOXIOUS WEEDS .........................6 APPENDIX B- GARFIELD COUNTY NOXIOUS WEED 1IST............ ........9 APPENDIX C _ NOBLE'S RECLAMATION PLAN.... ..........1O APPENDIX D _ NOBLE,S NOXIOUS WEED MANAGEMENT PLAN .......................13 Weed lnventory, Rulison Laydown Yard 1. PRorecr Drscnrprtoru This noxious weed inventory and management plan was prepared at the request of Noble Energy (Noble) for the existing Rulison Compressor Station and laydown yard. This facility is located in the NE% of the SE % of Section 8, Township 75, Range 94W of the 5th P.M. in Garfield County, CO' The Rulison Compressor Station is an existing compressor station with an adjacent area that is being used as a laydown yard. The location footprint is approximately L.25 acres; a total of approximately 5.5 acres were surveyed, including the pad footprint, all cut and fill slopes, and a 10 foot buffer' Olsson Associates (Olsson) was retained by Noble to conduct a follow-up noxious weed survey and to provide Noble's existing Weed Management Plan to fulfill requirements requested by Garfield County's Vegetation Management department. Both Garfield County's noxious weed listl and the State of Colorado's noxious weed list2 were utilized for Olsson's' survey efforts (see Appendix A and B). To summarize, our surveys found the following State listed noxious weeds: o lListBSpecies o Plumeless thistle (Carduus acanthoides) G o Musk thistle (Corduus nutons) G o 2ListCSpecies o Bulbous bluegrass (Poa bulbosal o Cheatgrass (Anisontho tectoruml o Field Bindweed (Convolvulus arvensis\ G= also a Garfield County noxious weed 1.1. Description of Analysis Area The proposed facility exists in converging natural vegetation communities of mixed grasslands (likely caused by the removal of sagebrush shrublands), native sagebrush steppe, and mixed mountain shrublands. The naturalvegetation is dominated by mountain sagebrush (Artemisio tridentate sbsp. pouciflora) with a scattered presence of Utah serviceberry (Amelonchier utohensis), snowberry (Symphorocorpos rotundifolia), and oakbrush (Quercus gombeliil. The understory was diverse, and was dominated by American vetch (Viscio americona), lupine (Lupinus spp.), Sandberg bluegrass (Poo secundal, paintbrush (Costilleja spp.), scorpion weed (Phocelio heterophyllo), sulfur flower (Eriogonum umbellotum), junegrass (Koelaria mocarontho), yarrow (Achilleo millefolium), Rocky Mountain penstemon (Penstemon strictus), bluebunch wheatgrass (Pseudoroegnerio spicoto), green needlegrass (Nossella viriduta) and needle-and-thread grass (Hesp erostipo comota). Additional 1 Garfield County Noxious Weed list: http://www.garfield-county.com/vegetation-management/noxious-weed-list.aspx) 2 Colorado Noxious Weed list: http://wwwcolorado.gov/cs/Satellite?blobcol=urldata&blobheadernamel=Content- Disposition&blobheadername2=Content-Type&blobheadervaluel=inline%3B+filenam e%3D%22Noxious+Weed+List.pdf %?Z&blobheadervalue2=application%2Fpdf&blobkey=id&blobtable=MungoBlobs&blobwhere=1251965326013&ssbinary =true Weed lnventory, Rulison Laydown Yard ffi\orcsoru.August 11,2014 '' oLSsoN. A55OC:atES August LL,2OL4 species occurred in lesser coverage and amounts. The pad locations has been kept mostly clear of vegetation. The location berms, cut slopes, and fill slopes support many weedy species, as well as seeded grasses. The dominating vegetation includes cheatgrass (Anisontho tectorum), bulbous bluegrass (Poa bulboso), slender wheatgrass (Elymus trachycoulus), thickspike wheatgrass (Elymus lonceolatus), crested wheatgrass (Agropyron cristotum), plumeless thistle (Corduus ocanthoides), and field bindweed (Convolvu I us orvensis). 1.2. Photos of Dominant Vegetation Community Types Natural Mixed Mountain Shrubland to south Seeded grasses on northern berm Standing on southern berm looking northwest Weed lnventory, Rulison Laydown Yard At entrance !ooking southwest at pad oL550N,A550CtAtE5 August LL,2074 2. Rrsuus oF SURVEY Erronrs Plumeless thistle, cheatgrass, bulbous bluegrass, and field bindweed were the most common noxious weed found within the project area. Plumeless thistle occurred on the perimeter of the pad both on cut and fill slopes; the plumeless thistle occurred mostly on the north perimeter of the storage area along the drainage ditch that had been constructed along the pad's fill-slope base, but was also found in smaller concentrated pockets around the project area. The total coverage area across the site was likely less than 7%o, buI was closer to 40% cover within the more concentrated areas. Field bindweed was widely scattered and only occurred in very low densities(<7% cover). A single musk thistle was observed in a patch of plumeless thistle. The existing pad berms were dominated by chreatgrass along the South and east cutslopes. ln these areas the cheatgrass intermixed with bulbous bluegrass accounts for more than half of all vegetative cover; therefore, it is likely that cheatgrass will be difficult to control during remediation efforts of the existing facilities or the proposed facility. Standing on south berm looking towards east berm Weed lnventory, Rulison Laydown Yard ffi\olssol,,August 11,20t4 2.1. Figure 1: Noxious Weed Map Weed lnventory, Rulison Laydown Yard fi ...1: ' ' 2"",i ._'.t "a Im fl ^*., *, ,?. t l 1 .: : n d€{-;L !a 21"& I.aydoam Yad Hcn<iotrs llYEed Are.a {See Descfinim} It'1]-l** 1 Hr{-e6t }*!rE D.a; 0 i }f J3 Hoxior:g bTeed lnYentary t*ip ?,481.afl!e EstE 5!& lG OLSSON ,,*tffii*8"o dt ai a I *r E t er:E-16!.l.lt6 Figure NW-{ Erem Ey': JlryFl tloble Eaergy Ll-C Rrliscn Laydo*n t'ard Garfield County, COE3l5,t',t O.!E: &'&to?.a 4 2.2. Noxious Weed lnventory Spreadsheet FID Lat Long Species Cover Growth Stage 1 39.451993 -t07.902154 Plumeless thistle 20%Flowered 2 39.45201s -107.902205 Field bindweed 0-s%Flowered 3 39.452410 -L07s02956 Plumeless thistle 20%Flowered 4 39.451888 -107.903841 Plumeless thistle s-10%Flowered 4 39.451888 -107.903841 Cheatgrass 10-L5%Flowered 4 39.451888 -107.903841 Bulbous bluegrass O-5o/o Flowered 5 39.45L201 -107.903246 Cheatgrass 40-50%Flowered 5 39.451201 -707.903246 Bulbous bluegrass o-5%Flowered 5 39.451201 -1o7.903246 Field bindweed 0-5%Flowered 6 39.451165 -L07.902973 Plumeless thistle 15-20%Flowered 5 39.45LL66 -107s02973 Musk thistle 0-5%Flowered 7 39.4s1390 -ro7.902470 Cheatgrass 40-50%Flowered 7 39.451390 -107.902470 Bulbous bluegrass o-5%Flowered 7 39.451390 -707.902470 Field bindweed o-5%Flowered oLssoN.August L1,2014a5toc!ArE9 3. Noxrous Weeo MarunerurNT PIAN Noble currently operates following their established Noxious Weed Management Plan for the control and eradication of state and county listed noxious weeds. Noble will continue to operate under this plan at the proposed location in the future. Please reference Appendix D below' 4. Sreo Mtx RecourueruDATloN Noble currently operates following their established Reclamation Plan for their reseeding and reclamation procedures. Within that plan are several seed mixes specific to natural ecoregion types' Noble will continue to follow and utilize the procedures and approved seed mixes in order to establish 70 percent of the pre-existing natural vegetation. Please reference Appendix C below. Weed lnventory, Ru/ison Laydown Yard ffi\Of-S5-Ory9 Ausust 11,2014 Apperuorx A- Colonaoo Ltsrro Noxlous WEEos Colorado Noxious Weeds (including Watch List) List A Species (22) Common Scientific African rue Camelthorn Common crupina Cypress spurge Dyer's woad Elongated mustard Giant reed Giant salvinia Hydrilla Japanese knotweed Giant knotweed Bohemian knotweed Meadow knapweed Mediterranean sage Medusahead Myrtle spurge Orange hawkweed Purple loosestrife Rush skeletonweed Squarrose knapweed Tansy ragwort Yellow starthistle List B Species (37) Common (Peganum hormolol lAlhagi pseudolhogi) (Crupino vulgarisl (Eu ph orbi a cy p o ri ssi a sl (lsotis tinctoriol (Brassico elongotal (Arundo donax\ (Salvinia molesta) (Hyd ril I a v e rti ci I lata) (P oly go n u m cus p idat u m) (Polygo n u m sacho I i ne nse\ (Poly go n u m x bo h e m icu m) (Centaureo pratensisl (Solvia aethiopis) (To e ni atheru m co put- med u sa el lEu phorb i o myrsi n ite sl (H ie roci u m a u ra nti a cu ml (Lythrum solicarial (Chondrillo junceo) (Centaureo virgata) (Senecio jocoboeo\ (Ce nto u reo sol stitio I is) Scientific Absinth wormwood Black henbane Bouncingbet Bullthistle Canada thistle Chinese clematis Common tansy Commonteasel Corn chamomile Cutleafteasel Dalmatian toadflax, broad-leaved Dalmatian toadflax, narrow-leaved Dame's rocket Diffuse knapweed (Arte misio obsi nthium) (Hyoscyamus nigerl (Sopono ria officinol is\ (Cirsium vulgore) {Cirsium arvense) (Clemotis orientolis) (Tonocetum vulgore) (Dipsocus fullonum\ (Anthemis orvensisl (Dipsacus lociniotus\ (Linorio dalmatica\ (Li no ri a g e n i stifol io\ (Hesperis motronalis\ (Centourea diffusol Weed lnventory, Rulison Laydown Yard ffi*Ol-SSOtt. assoctAlES August 1,1,,2074 Eurasian watermilfoil Hoary cress Houndstongue Jointed goatgrass Leafy spurge Mayweed chamomile Moth mullein Musk thistle Oxeye daisy Perennial pepperweed Plumeless thistle Quackgrass Russian knapweed Russian-olive Salt cedar Scentless chamomile Scotch thistle Spotted knapweed Spurred anoda Sulfur cinquefoil Venice mallow Wild caraway Yellow nutsedge Yellow toadflax List C Species (15) Common (My rio phyll u m sp i catu m\ lCardario drabal (Cy noglossu m officinole) (Aegilops cylindrica\ (Euphorbia esulo) (Anthemis cotulol (Verbascum blattoria) (Corduus nutans) (Chryso nthe m u m le uco nthe m u ml {Lepidium lotifoliuml (Carduus oconthoidesl (Elytrigia repensl (Acroptilon repens\ (Elaeagnus angustifolia) (Tomorix chinensis, T. parviflora, ond T. ramosrssrma) (Matricaria pe rforatal (Onopordum touricum) (Centaureo maculosa) (Anodo cristotal (Potentilla rectal (Hibiscus trionuml (Carum carvi) (Cyperus esculentus) (Linorio vulgoris\ Scientific Bulbous bluegrass Chicory Common burdock Common mullein Common St. Johnswort Downy brome Field bindweed Halogeton Johnsongrass Perennialsowth istle Poison hemlock Puncturevine Redstem filaree Velvetleaf Wild proso millet (Poa bulboso) (Cichorium intybusl (Arctium minus) (Verboscum thapsus\ (Hyperi cu m pe rfo rotu m\ (Anisantho tectoruml (Convolv ulus a rve nsisl (H a I ogeto n g I om e rotu s\ (Sorghum halepense\ (Sonchus arvensis) (Conium maculotuml (Tribulus terrestrisl (Erodium cicutoriuml (Abutil o n theop h rosti\ (Panicum miliaceum) Weed lnventory, Rulison Laydown Yard OLSSON, August 11, 2014 Wotch List Species (26) Common Scientific Asian mustard Baby's breath Bathurst burr, Spiney cocklebur Brazilian elodea Common bugloss Common reed Flowering rush Garlic mustard Hairy willow-herb Himalayan blackberry Ja panese blood grass/cogongrass Meadowhawkweed Onionweed Pampas grass Parrotfeather Scotch broom Sericea lespedeza Swainsonpea Syrian beancaper Water hyacinth Water lettuce White bryony Woolly distaffthistle Yellow flag iris Yellowfloatingheart Yellowtuft (B ro ssi co tou r nefo rtii) (Gypso ph i I a po ni cu I otal (Xanthium spinosum) (Egerio densol (Anchusa officinolisl (P h rag m ites o u stra I i s\ (Butomus umbellotusl (Alliaria petiolota) (Epilobium hirsutum\ {Rubus armeniacus) (lmperoto cylindrico) (H ie ra ci u m co es p itos u ml (As p hode I u s fi stu I osus\ (Cortideria jubotol (My r i o phy I I u m a q u ati cu ml (Cytisus scoparius\ (Lespedeza cuneato) (S ph a e rop hys o so I s u I o) (Zygophyllum fabago\ (Eich ho r ni o cra ss i pesl (Pistio strotiotes) {Bryonio olbo) lCorthamus lonotus) (lris pseudocorusl (Nymphoides peltotal lAlyssum murole, A. corsicum\ Weed lnventory, Rulison Laydown Yard st 11, 2014 Apperuorx B- Genrtrlo Courury Noxlous Weeo Ltsr Common name Leafy Spurge Scientific name Euphorbia esulo Russian Knapweed Acroptilon repens :Yellow Starthistle ..-,.-"..--.". r Plumeless Thistle Centoureo solstitalis Corduus aconthoides i Houndstongue lCynoglossum officinale ,Common Burdock Arctium minus Scotch Thistle ' Onopordum ocanthium Canada Thistle Cirsium orvense Spotted Knapweed Centoureo maculoso Centaurea diffusa I Toodflax Lino ria dal matica i ' Diffuse Knapweed Dalmatian Salt Cedar . y"llo* Toadflax ', Linaria vulgaris j Hoary Cress ' Cordorio drobo Ta ma rix parviflora, To mo rix ra mosissi mo Purple Loosestrife , Russian Olive Lythrum saliicorio Eloe og n us a ngustifot ia Oxeye Daisy Chrysonthemum leucontheum Jointed Goatgrass ' Aegilops cylindrico Chicory Cichorium intybus Musk Thistle Carduus nutons Weed lnventory, Rulison Laydown Yard I -t OLSSON {, August 11, 2014 Apperuorx C - Nogts's REcLAMATToN PLAN Reclamation Plan Noble Energy lnc. Noble estimates that the proposed laydown yard will be in operation for an anticipated period of approximately thirty (30) years in order to accommodate Noble's natural gas operations. Upon termination of the development and production activities, the communication tower location will be reclaimed, as outlined below: . All equipment and structures will be removed.. Noble will remove all safety and stormwater BMPs, and other surface objects from the premises.. Noble will restore the site to pre-facility conditions by re-contouring and re-vegetating the site. Top soil will be redistributed across the site and will be reseeded with an approved seed mix (see attached seed mix recommendation).. Noble will monitor the site to ensure that 70 percent of the pre-existing vegetation is achieved. Seedbed Preoaration and Slooe Reconstruction: Cut and fill slopes will be backfilled and re-contoured to a slope of 3:1 - 2.5:1 or less in instances where necessary to match the existing natural contours. Following final contouring, all backfilled or ripped surfaces will be covered evenly with topsoil. Re-contouring should form a complex slope with heavy pocking. ln areas with slope greater than 3 percent, imprinting of the seed bed is recommended. Final seedbed prep will consist of scarifying/imprinting the topsoil prior to seeding. lmprinting can be in the form of dozer tracks or furrows perpendicular to the direction of slope. When hydro-seeding or mulching, imprinting should be done prior to seeding, unless the mulch is to be crimped into the soil surface. lf broadcast seeding and harrowing, imprinting will be done as part of the harrowing. Furrowing can be done by several methods, the most simple of which is to drill seed perpendicular to the direction of slope in a prepared bed. Other simple imprinting methods include deep hand raking and harrowing, always perpendicular to the direction of slope. All compacted areas will be ripped to depth of 18" with max furrow spacing of 2'. Where practicable, ripping will be conducted in two passes at perpendicular direction. Toosoil: Following final contouring, all backfilled or ripped surfaces will be covered evenly with topsoil. The topsoil in the cut slope on the back of the pad will be heavily pocked using the excavator bucket to form an uneven soil surface complex which will aid in revegetation and help with slope stabilization. The fill slope, and remaining disturbed, and reclaimed areas will be track walked to aid in revegetation and slope stabilization. ln areas that may not have been disturbed during the reclamation process or areas of suspected compaction that will be reseeded, measures will be taken to loosen and spread the topsoil. These measures may include scarifying the soil by racking or harrowing the soil. Seed Mix: Seed mix used for reclamation will be taken from the approved seed mixtures identified below: Weed lnventory, Rulison Laydown Yard 10 olssoN,,August L\AL4 Low-Elevation Salt-Desert Scrub/Basin Common Name Scientific Names Form PLS lbs/acren Founruing Saltbush Atriplex canescens Shrub 1.9 Shadscale Atri pl ex confertifol i a Shrub 1.5 Galleta Pleuraphis IHilarial iamesii Bunch 2.5 AlkaliSacaton Sporobo/us airoides Bunch 0.2 Streambank Wheatorass Elymus lanceolatus ssp. Psammophil us, Aqropvron riparium Sod- formino 2.5 Slender Wheatqrass Elvmus trachvcaulus, Agropyron trachycaulum Bunch 1.8 Sandberq Blueqrass Poa sandbergii, Poa secunda Bunch 0.3 -Basedon45pureliveseeds(PLS)perSquarefoot,drill-seeded.Doublethisrate(90PLSperSquarefoot)if broadcast or hydroseeded. Mountain Meadows Common Name Scientific Names Form PLS lbs/acre* Mountain Brome Bromopsis fBromusl marqinatus Bunch 5.8 Slender Wheatqrass Elvmus trachvcaulus. Aqropvron trachvcaulum Bunch 3.3 Letterman Needleqrass Ach n atheru m fStipal I etterman i i Bunch 3.5 Blue Wildrye Elvmus glaucus Bunch 4.8 Thickspike Wheatgrass Ely mu s I anceolatus ssp. /anceolafus, Aqropvron dasvstachvum Sod- formino 3.4 ldaho Fescue Festuca, ldahoensis Bunch 1.2 Wheeler Bluegrass Poa nervosa Sod- forminq 0.6 *Based on 60 pure live seeds (PLS) per square foot, drill-seeded. Double this rate (120 PLS per square foot) if broadcast or hydroseeded. Pi Mountai Shrubland Common Name Scientific Name Form PLS lbs/acre* lndian Riceqrass Achnatherum [Orvzopsisl hvmenoides Bunch 1.9 Galleta Pleuraphis IH ilarial iamesii Bunch 2.5 Bluebunch Wheatqrass Pseudoroeqneria spicata, Aqropvron spicatum Bunch 2.8 Slender Wheatqrass Elvmus trachvcaulus, Agropvron trachYcaulum Bunch 3.3 Mutton qrass Poa fendleriana Bunch 0.6 Sandberq Blueqrass Poa sandberqii, Poa secunda Bunch 0.6 -Biied on 60 pure live seeds (PLS) per square foot, drill-seeded. Double this rate (120 PLS per square foot) if broadcast or hydroseeded. Weed lnventory, Rulison Laydown Yard 11 OLSSON o August 11, 2014 Mixed Mountain Shrubland, lncl Oakbrush Common Name Scientific Names Form PLS lbs/acre* Thickspike Wheatgrass Elymus lanceolatus ssp. lanceolatus, Aoropvron dasvstachvum Sod- formino 3.4 Bluebunch Wheatqrass Pseudoroegneria spicata, Agropyron spicatum Bunch 3.7 Bottlebrush Squirreltail Elvmus elvmoides, Sitanion hystrix Bunch 2.7 Slender Wheatqrass Elvmus trachvcaulus, Agropvron trachycaulum Bunch 3.3 Canby Blueqrass Poa canbyi. P. secunda Bunch 0.6 Mutton qrass Poa fendleriana Bunch 0.6 Letterman Needleqrass Achnatherum [Stipa] lettermanii Bunch 1.7 Columbia Needlegrass Achnatherum [Stipa] nelsonii, Stipa columbiana Bunch 1.7 lndian Ricegrass Achnaterum fOrvzopsisl hvmenoides Bunch 1.9 Juneqrass Koeleria macrantha, K. cristata Bunch 0.1 *Based on 60 pure live seeds (PLS) per square foot, drill-seeded. Double this rate (120 PLS per square foot) if broadcast or hydroseeded. Seedinq Procedures: For best results and success, the recommended grass mixture reseeding should be done in late autumn in order to take advantage of natural precipitation for the region. The reseeding rate should be doubled for broadcast application. Preferred seeding method is multiple seed bin rangeland drill with no soil preparation other than simple grading to slope and imprinting and water bars, where applicable. Alternative seeding methods include, but are not limited to:. harrow with just enough soil moisture to create a rough surface, broadcast seed and reharrow, preferably at a 90 degree angle to the first harrow;o hydro-seeding (most economical in terms of seed cost); and. hand raking and broadcast followed by re-raking at a 90 degree angle to the first raking.. These are not the only means of replanting the site. However, these methods have been observed to be effective in similar landscapes. The prepared soils will be seeded (weather permitting) no more than 24 hours following completion of final seedbed preparation. The seeding will be conducted by means of drilling the prescribed seed at prescribed seeding rate. The seed will be drilled with a common range drill at a depth of 0.25 - 0.5' beneath the soil surface. The seed will be drilled horizontally across the pad faces and perpendicular to the track walking when possible. When slope gradient less than 2.5:1 exists and drilling is not possible from a mechanical and safety standpoint the soils will be broadcast seeded at twice the prescribed amount. The reseeding will be monitored and reseeded as appropriate until the reclamation standards detailed above are met. Mulch: With 24 hours of reseeding (weather permitting) hydromulch will be applied to all reclaimed and reseeded surfaces. Areas where the erosion potential is such that biodegradable blankets will be used will not be hydromulched. Weed lnventory, Rulison Laydown Yard t2 OLSSON E Ausust 11, 2014 Apprruorx D - Nostr's Noxtous Weeo MnruRe ennrNT PLAN Weed lnventory, Rulison Laydown Yard 73 Noxious Weed Management Plan Piceance Basin Garfield and Mesa Counties, Colorado f13"gHl?sy 800 Airport Road, Suite 3 Rifle, Golorado 81650 January 2010 CONTENTS 1.0 TNTRODUCTTON.... ..................1'1 2.0 PLAN OVERVIEW .-...-...-........-.2'1 3.0 GOALS AND OBIECTTVES ..."3'1 Goal I Prevention """""""" 3-1 Goal 2 Treatment.... """"""' 34 Goal3 Monitoring """""""'3-6 Goal4 Cooperation. """"""' 3-6 4.0 REFERENCES......... ..................4'1 APPEI\DIX A - COLORADO NOXIOUS WEED LAW APPEI\DIX B . STAI\DARD IVIITIGATIONS/COMMITTED MEASURES lrl=nobler \., enefgy I.O INTRODUCTION Noxious weeds are often non-native plant species which have been introduced into an environment with few, if any, natural biological controls, thus providing them a distinct competitive advantage in dominating and displacing native plant species. They possess the ability to dominate plant communities to the extent plant diversity and ecosystem integrity are threatened. Noxious weeds also threaten valuable wildlife habitat, cause economic hardships to agriculture and are a nuisance for recreational activities. Noxious weeds are difficult to eradicate or control because they readily become established in disturbed areas, spread rapidly, possess a unique ability to reproduce profusely, and resist control. In general, noxious weeds are most corlmon in areas where human activity is having or has had the greatest impact on the soil and vegetation and/or where human activities have resulted in the introduction of seed sources. Previously disturbed land, where the plant cover has been removed is susceptible to noxious weed establishment and invasion into adjacent native plant communities' These include roadways, rock or borrow pits, heavily grazed areas, mininB, Bas and oil drilling areas, and irrigation canals. Species of noxious weeds that are known to occur in the Mesa/Garfield County area in Colorado are listed in Table 1. There are state and federal laws that provide definitions of and guidance for the management of noxious weeds (Colorado Departrnent of Agriculture 2009a,b). The Noxious Weed Management Plan (Plan) provides a process for implementing noxious weed management strategies to be used by Noble Energy Inc. (NEI) during activities in the Piceance Field. The guiding purpose of noxious weed management in this Plan is to preclude the inadvertent introduction, establishment, or proliferation of noxious weed species as a result of NEI development activities. It is the intent of NEI to cooperate with federal and state agencies, local landowners, county weed control agents, and other parties in the management and control of noxious weeds in the area. Piceance Noxious Weed Management Plan 1-1 January 2010 lrlsnoble' v energy Table 1. Combined Noxious Weed List from Mesa & Garfield Counties (2001,2007) Common name Scientific name Countv List Bull Thistle Cirsium lulgare Mesa Canada Thistle Cirsium arvense Mesa/Garfield Chicory Cichorium intybus Garfield Common Burdock Arctium minus Mesa/Garfield Dalmatian Toadflax Linaria dalmatica Mesa/Garfield Diffuse Knapweed Centaurea diffusa Mesa/Garfield Dyer's Woad Isatis tinctoria Mesa Hoary Cress Cardaria draba Mesa/Garfield Houndstongue Cynoglossum officinale Mesa/Garfield Jointed Goatgrass Aegilops cylindrica Mesa/Garfield Leafu Spurqe Euphorbia esula Mesa/Garfield Musk Thistle Carduus nutans Mesa/Garfield Oxeye Daisy Chrysanthemum leucantheum Mesa/Garfield Plumeless Thistle Carduus acanthoides Mesa/Garfield Pumle Loosestrife Llthrum salicaria Mesa/Garfield Russian Knapweed Acroptilon repens Mesa/Garfield Russian Olive Elaeagnus anzustifolia Garfield Salt Cedar Tamarix parviflora, Tamarix ramosissima Mesa/Garfield Scotch Thistle Onopordum acanthium Mesa/Garf,reld Spotted Knapweed Centaurea maculosa Mesa/Garfield Yellow Starthistle Centaurea solstitalis Mesa/Garfield Yellow Toadflax Linaria vulqaris Mesa/Garfield Piceance Noxious Weed Management Plan 1-2 January 2010 tsl:t nobleI \z energy 2.0 PLAN O\'ERVIEW The primary goal of this Plan is to preclude the inadvertent introduction, establishment or proliferation of any noxious weed species as a result of the proposed activities. The shared goals of: l) prevention, 2) treatment, 3) monitoring, and 4) cooperation form the framework of this Plan. Each goal is characterized by specific management objectives intended to achieve the goal. Each objective has specific actions that will be implemented by NEI. The following summarizes the goals of this Plan. 1) Prevention Preventive actions include conducting periodic weed surveys and the use of weed-free seed mixtures during reclamation. Weed sgrveys of the field will be conducted by a local weed expert to identiff noxious species on a scheduled basis so that infestations can be treated quickly before they spread. Revegetation activities will be completed in all disturbed areas not required to be vegetation-free. Proper and timely revegetation with desirable species will create less favorable conditions for weed growth and spread. Revegetation will be done with weed-free seed and mulch. Disturbances will minimize spread of weeds by treating them prior to disturbance or avoiding them. 2) Treatment Treaffnents will be developed using integrated weed management principles for each species and situation. Treatments may include hand pulling, grubbing, mowing, mulching, seeding, burning, herbicide application and soil management, as recommended by NEI's local weed expert. All treatrnents will follow the guidelines stipulated in this Plan. Large and/or widespread weed infestations that are beyond the control and influence of NEI will be managed cooperatively with other parties. All treatrnents will be monitored for effectiveness. 3) Monitoring Monitoring will be conducted on a scheduled basis to detect new infestations, evaluate prevention and/or freatment success, and identiff the need for re-treatrnent. 4) Cooperation NEI will cooperate with the U.S. Bureau of Land Management, Garfield and Mesa Counties and affected landowners to manage noxious weeds in the project area. Piceance Noxious Weed Management Plan 2-1 January 2010 l,l=nobler v energY 3.0 GOALS AI\D OBJECTIVES Goal l. Prevention Objective 1: Forestall or hinder the introduction and spread of specific noxious weed species in areas not currentlY infested. Action: Ensure that disturbed land adjacent to vegetation-free zones is revegetated immediately after disturbance. Although revegetation after ground disturbance is a guiding principle for the management of weeds, NEI requires vegetation-free zones around their well pads and infrastructure for safety reasons. This vegetation-free zone is approxim ately 250 feet by 300 feet or an estimated 1.6 acres for each well pad. Outside of the vegetation-free zones, NEI will revegetate bare ground regardless of whether noxious weeds are in the local area. Native plant species (or domestic varieties of native species) will be used instead of introduced species for seeding for site protection if the native species can accomplish the site objectives in a reasonable time frame and costs are not excessive. Species and seed mixes that will become established will be used for the reclamation of disturbed ground. Generally, the addition of broadleaf species to seed mixes will be avoided as reseeded areas often require herbicidal treatrnent of broadleaf weeds in the first year or two, which would also affect all desirable broadleaf species in the treated area. All seed purchased for reclamation purposes will be free of noxious weeds. If hay or straw will be used for mulching, erosion control, rehabilitation, or other uses, it will be free of noxious weeds and their seeds. On national BLM Lands, reclamation will use the approved BLM seed mixes listed in Tables 2-l th.rough24. Piceance Noxious Weed Management Plan 3-1 January 2010 |/ltnobler v energy T:rble l-I. LolY-Elel illir')n Silll-Eelell Sclub Basilr Big Silgeblush ,Bdsedolt60purelil,eseeils{PLS)persqaorcfoot,drilt-s?eded. Doublethisrdte(l20PLSPersqudrefoot)ifbrcodcastorhl'tlrosedled' *Based an 60 pure ln'e seeds (PLS) pet sqtrdre foot, rlill'seeded-Doubb fiis ftrle ( 120 PLS Per square foot) il broodcasl or hl'dtosceded' ('ommorl Iatne Scierrtific Iames 1'eliet]"SearoD Fot'm PLS lbsi acle" Plant Both of the Follo$ing (scil Efrch, l0q6 T01fl1) Ftrnrrlrng Saltbush .litipies' canesc*ts 1,}lS Shnrb t.: Sliiri{;cale -aripiex confenifolia \'"I{S Shnrtr 1.0 ard T\ro of lh€ Follorriug (15qo Each' 50q6 Tot{l) Bonlebrush Sqtur:eltail Ebmtx elvnoides, Siwnion hYsnix \Tis Cool Brurth _t .:1 Suearnbanli \\'teatEl.as5 Elynrus I anceolafits s sp. psunnnophr lns, .4qromton iod|iltm Scrdar C'ool Sod-fonlrng l Bluebunch \lheatpnass Ps e ud or o egn e ri a s pi c a t a Secar Clool Biutch and One of the Follo$irg (209 o lotal) hd:an fuceggass .4chnarhenm [o);:opsis] h]ilenoides Pal:nra. Rnruock Cool Brurch Saldbers Bhtegmss Poa soudbergii, Poa searnda \,NS Cooi Bturch 0.6 and One of the Follorriug (100.0 Total) Alliah SacatoB Sporobolus ai'oide.s \:NS 1\'ar11]Burlch 015 Salura \trrrldn e Letrnus salinus \,}iS C ool Brurch 1.0 and Oue of the FolloryiDg {100-t Total) Galleta P! eraphi s [Hiiai dJ j anresii \rir,a florets \V3flr Bunch Sod- fomrurs 16 Sald Dropseed Sporobol u s cr1'ptandn r s \,Tis \\'afln Bunch 0.05 TableS-2. Pitl\.on-Juuiper'\\-oodlandanilor'\Iountaiuil11'orningBigsagebrushsht'ubland Common Name Scientilic Iames \-ariet.T Season Form PLS lbsi acr"e" Plflrt Both of the Follorring (l 5o-o Each.30qo lotal) Bottlebrush Squmeltail Eivnus efumoides, Sitanion hlsnix \Tis Cool BturcL Bluebrurch \\leatEass Psendoroegneria sPicata,,l.grop,"ron enirannn Secai- P-7. Anato[e. Goklar' Cool Burirh and T$'o of tht Follorving (209o E:rch. 'l0o o Total) Thich;prke l\'lteater a5s El'nnts lanceolatus ssp. I anc eolatus, ,t Qt o D'no n d e- s I a c l?v $ n Clitana. Barurock. Schrteudiuar'Cool Sod-lbrrrulg i.4 Slerder l\heatgrass El.vnuts n'achycaulw,,lgropY'ori o'aclncaultl;ln Relenue. Pr:,or C ool Bunch t, \\reslem Wheat*sras!Pascopntm [-lgropyronJ sltirltii Rosana. Aniba C ool Sod-fonlrlg +.8 anrl T$ o of the Follotritlg (15! o Each. 30o o Totnl) ludiarr Ricegr*s .lchnarhatnn [Ory':oPSisJ hvnenoi des P:llorni. fu[uock C ool Bui!'h _o Gallrta Piatrap\i s [Hi I ntl ai j a?hesi i \irra florets lVann Buuch Socl- formilc l5 Muttorlgless Poa {ettdlenana \,}JS ('ool Bunch 0.1 Saldberg Bhugmsi Poa sandbergii, Poa secundn \}is C ool Bturch 0.1 Piceance Noxious Weed Management Plan 3-2 January 201 0 l'ls noble, v energy Trble !-3. llised llounteirt Shtrtbllnd, In(ludiDg Oakl)ruslt Cornmon Name Scientilic NaIDes \'rrirt!'Sees0n For'!D PLS lbsincl'e* Plelrt Botll of the Follo\ring (209.0 Eatlt. {00.0 Tohl) Bottlebrush Squrrreltrol Elymus eiynoides, Stldrtoi? ir]srn.r \NS C'ool Brmch Bluebrnch \1'lteatgra rs Ps etdoroegn eti a spit ata, .4€roPy on sniratr ln S-"car. P-,-. Ar}lttone Go]da,Cool Butch J. / autl Twe of rle Follotri[g (l5o,o Ench. 30q-o Total) Tlur'ksprtrie \\he atlnass Elyntus lanceolatrs ssp. lanceolatus, .lst'ootr on d as]is tacl* u sn Critala. Bamcnk Schl,endunar Cool Sod-t'or:iung 1S Sletder trVheatgrass E !v, r Lrs fi ' d c h !^ c au h t s,,1 gr opt r on tarhtrntrltnt Sal Lurs C ool Bunch t-s trVestern 'Wheatgmsr Pascop|rutfi f-lgt opv oni slnirhii Alnba Rorfira Cool Sod-for:lrtg JO ancl One of lhe Follorrirg (100 0 Total) Brg Blrcgrass Poa aupia Shermal ('ool Brurch 0.-i Calbv Bluegass Poo canbri. P. secunda Calbar C txl Burch 0-l Muttongrass Poa fe*dietiana 1:}IS ( ool Buflrll 0-1 erd One of the FollorriDg (10o,'o Total) Lettermai Needleguass .lc h nath en m I Srip aJ I ett erm ani i lNS C'ool Burclr ll C olurutrra Needlegrass A.hnatheftm [Snpal nelsonii. Sripa colutnbiano \1,ts Cool BuDch l7 Greel Needlegrass Nas s el I a I Snp a] viri d u I a Lodonu Cucharas C ool BrlDL'h 1.4 and One of ihe Follorting (100,0 Total) Lxlial Ricegra:s Achna thentn [Ot1=opsis] h1' menot des Nezpar'. Palorna. Rimrock C ool Brurch 1.9 Jrureerass Noelet'ia macranthct, K. ct'iststa !}{S Nofth Aorerical orieil)C ool Buich 0.1 *Brrsert on 60 pure lil,e sepds (PLs;) pt sqilarc {oor, ditl-seettptt- Do,tbte this ro\e ( 1 20 PLS pfi stlttdre foo\ il btoadcdst or hl'tbos?eded. Table 2{. Spruce-Fir Fol est, Including }Iountai[ lleadorvs Common J{ame Scientili{ Names \.nrier)*SeaioD FoIrn PLS lbs,'acr.e* Plaut Both of the Follolriilg (20oro Each, {00:o Total) N{cltultain Brcn1e Bromops is fbom usi m argtn a n s Gamet. Bromar Cool Bruich 58 Sleflder \l'heatgmss Elynits ,'ach),coulus, AgroP!'ron o'achtraulunt Sal Ltrs Cool Bunclr and T11'o of the Follolrilg (150 o Each. 30ob Tofal) Letermal NeedleEass .lchnarherum [Sripa] I eftenilanii INS C ool Bunelr l6 Blue Wrldle Ebnrus glmtcus \ais C ool Bunch -i6 Iddro Fescre Fesruca idahoensis Josepll Nezprus Cool Brurch 09 and T$o of the Follorring (l5qo Each.30qo Tofal) Nodding Brorne Bt onnrs attotnalous \NS ('ool Bunch Tllctsprte \tr'heatsrars Elt'tttas lanceol att$ ssP- la*caolalils, 4 fr nnrht d a o'.<t a rltr nn Cfitaaa. Banlock (chrtcndinrrr C'rrol Sod-t'or:rung 5 Bis Bhperass Poo anpia Shemral C ool Brrrrch 04 \Vheeler Bhregrasr Poa netrosa \NS CoErl Sod-tbtrfug 0.4 *B.rte.t on 60 purc lit,e seeds PLfil per sqflaft foot, dritl-seillett. Double thit rute (120 PLS Pet squaft foot) if brcadcdst ot hl'druteeded- Pieance Noxious weed Management Plan January 20'103-3 f1=nobler \., energy Objective 2: Prevent the spread or proliferation of existing infestations. Action: Conduct ground disturbing actions consistent with the goals and objectives of this Plan. Where road shoulders or drainage ditches are covered by desirable herbaceous cover, consider leaving it in place rather than clearing it off, if such a practice can be done without causing excessive damage to the road or ground surface or cause signif,rcant public safety hazards. Use the following guidelines for existing infestations to be disturbed: (1) if the weed is not in flower, or will not reproduce through damaged plant parts (i.e., vegetatively), proceed with maintenance/road work, (2) if the weed has flowered, either hand pull or cut all tops, bag in a plastic bag (and dispose of appropriately), then proceed with road work; or flag the site for avoidance by the machinery until the infestation is treated; and (3) if the weed is known or suspected to sprout vegetatively from cut parts, flag the site to ensure avoidance by machinery until the weed can be freated by proper means. Goal2. Treatment Objective 1: Evaluate ffeatment options for established infestations. Actions: Evaluate each infestation for causal factors and appropriate treatment employing integrated weed management principles. Integrated Weed Management (IWM) is a decision-making process used to select the most appropriate actions from an assortment of options and apply them to each unique situation. IWM Piceance Noxious Weed Management Plan 3-4 January 2010 fl:t nobler v energy evaluates, integrates, and implements noxious weed management strategies based on predicted ecological, sociological, and economic consequences. IWM includes the use of naturally occurring weed controls including biological diversity, competition, and plant succession. In addition, IWM utilizes various mechanical, biological, cultural and chemical controls, and habitat modification techniques. Objectives will be set for each infestation and will include reasonable and attainable time frames for management. Management objectives may include: control (to prevent reproduction), containment (to prevent off site movement), reduction (to shrink the population in number, density, and/or area covered); and/or eradication (to eliminate pelmanently from the site). In cases where infestations extend beyond the areas affected by NEI's activities and/or are contributed to by management of surrounding lands, NEI will coordinate with adjacent landowners to determine the appropriateness and anticipated effectiveness of treatment options. If adjacent lands are not ffeated, NEI may decline to ffeat infestations on their areas or to limit their ffeatments to non- chemical methods or to roadsides only. This will minimize the use of herbicides where results may be poor. The greatest priority for treatment will be placed on species in Garfreld and Mesa County classified as Class L Class II species located outside of public roadways will be given less emphasis for treatment and will not be managed if treatrnents are predicted to have little effect. Prepare and Implement Treatment Plans Treafinent options appropriate for use by NEI are limited to physical, mechanical, cultural, and chemical methods. Specific methods include hand pulling, grubbing, mowing, mulching, burning, herbicide application, and soil management. Appropriate herbicides are a frrnction of the target noxious weed species and are not listed in this Plan. Specific herbicides will be determined in conjgnction with the BLM, as appropriate, in order to ensure the best, most current information is applied. Guidelines to be followed for all treatrnent activities are listed in Appendix C. AII treatrnents will be conducted in a manner consistent with the guidelines and measures in this plan including all appendices. On BLM land, all treatments will be developed in coordination with the BLM. Piceance Noxious Weed Management Plan 3-5 January 201 0 l^ls nobler \z enefgY Goal3. Monitoring Objective l: Implement a sound monitoring program to ffack prevention and treatment activities and to determine the effectiveness of such practices to meet stated objectives. Actions: Conductfield surveys to detect new infestations and/or changes in existing infestations. Field surveys will be conducted periodically throughout the NEI Piceance field to monitor changes and determine the need for new treatments and re-treatments. Goal4. Cooperation Objective 1: To coordinate and integrate inventory, prevention and management of noxious weeds with private parties; federal, state and local governments; and other agencies. Actions: Manage established infestations infull coordination with BLM and landowners. Objectives for each established infestation are determined in an integrated manner and are applied through a process based on an assessment of risks, costs/benefits, appropriate strategies and tactics. Determine treatment options cooperatively with affected parties. (See Goals 2 and 4.) 3-6Piceance Noxious weed Management Plan January 2010 l l:t nobler \, enefgy 4.0 REFERENCES Garfield County. 2007. Noxious Weed 1is1. httrr://w'lv',v.garf,1e1d-county.com/Inder.aspx?paeF607 Mesa County. 2001. Noxious Weed Management Plan httrr://www.mesacountv.us/pesVpestcontroV weeds.pdf Colorado Department of Agriculture . 2009a. Colorado Revised Statutes. http://www.ae.state.co.us,/DPl/ rules/noxious.html Colorado Department of Agriculture.2009b. Colorado Noxious Program Brochure. http://www.colorado' gov/cs/Satellite/Agriculture-Main/CDAG/1 1 78305 828928 Piceance Noxious Weed Management Plan 4-1 January 2010 APPENIDIX A COLORADO NOXIOUS WEED LAW APPENDIX B STANDARD MITIGATIONS/COMMITTED MEASURES COMMITTED MEASURES FOR ALL TREATMENTS For All Methods 1. Notifu interested parties and adjacent landowners during project planning stage and again prior to implementation. 2. Ensure appropriate management of livestock, if any. 3. Monitor treated sites periodically to determine the need for treatrnent/ retreatment. For Use of Fire 4. Observe all local ordinances, bans, or restrictions on burning. 5. Protect air quality following all state and local regulation. 6. Use the best available technology to reduce smoke. 7. Vegetation ffeated with herbicide will not be burned for at least one year following treatrnent. For Herbicide Uses 8. No aerial application of herbicides is permitted under this plan. g. Use USEPA-registered chemicals only and follow herbicide label instructions precisely; never exceed the recommended application rates. 10. Protective clothing will be worn by all workers involved in herbicide work. 11. Public notification will be used for all applications where there is a potential for public exposure. 12. Workers who know that they are hypersensitive to herbicides will not be used for application projects. 13. Precautions will be taken to prevent accidental leaks or spills. 14. Do not prepare mixtures or clean equipment where ground water could be contaminated. 15. Control spray to prescribed boundaries. 16. Keep copies of material safety data sheets on site during the use of herbicides. 17. Treatrnents will be performed by a certified applicator. David Pesnichak From: Sent: To: Subject: Chris Hale <chris@mountaincross-en9.com> Monday, August 25,207410:57 AM David Pesnichak RE: Noble Rulison Laydown Yard David: I have reviewed the additional information provided. This satisfies the originalcomment. No additional comments were generated. Sincerely, Mountain Cross Engineering, Inc. Chris Hale, P.E. 826112 Grand Avenue Glenwood Springs, CO 81601 Ph: 970.945.5544 Fx: 970.945.5558 From: David Pesnichak [mailto:dpesnichak@garfield-county.com] Sent: Tuesday, August 79,20L4 8:18 AM To: Chris Hale Subject: FW: Noble Rulison Laydown Yard HiChris, Attached is Nobles response to your comments, which became conditions of approval for the Rulison site. Please review this information and let me know if this satisfies your concerns. Thanks, Dave David Pesnichak, AICP Senior Planner Garfield County Community Development Department 108 8th st Suite 401 Glenwood Springs, CO 81601 (97O)94s-82L2 d pesnichak@ga rfield-countv.com http : //www.ga rfield-co u ntv.com/co mm u nitv-deve lopme nt/ C r;arpittt c*at4' . From: Tilda Evans Imailto:tevans@olssonassociates.coml Sent: Monday, August 18,20L4 4:49 PM To: David Pesnichak Cc: Lorne PrescotU'mbonkiewicz@nobleenergyinc.com' Subject: Noble Rulison Laydown Yard David, Attached is our response to Chris Hale's questions on the Drainage Report (COA #3). I think this takes care of all of the COAs for this project. Please let us know if you have any further questions. Tilda Evans I Land Development I Olsson Associates 760 Horizon Drive, Suite 102 lGrand Junction, CO 81506 ltevans@olssonassociates.com TEL 970.263.7800 | DIRECT 970.263.6015 ICELL 970.683.8879 | FAX 970.263.7456 ffilleuol$F.Qllr In ffi HH gfi Rtease consider the environnrerrt befone prlnti