The URL can be used to link to this page

Browse Search

Home My WebLink About20003077.tiff r" PLANNED UNIT DEVELOPMENT CHANGE OF ZONE APPLICATION PLANNING DEPARTMENT USE ONLY: Case Number Application Fee: (0U7J't2 • 02.) Zoning District Receipt Number Date_ joj/o l . Application Checked By: Planner Assigned to Case. To BE COMPLETED BYTHE APPLICANT: (Print or type only except for required signatures). I(we), the undersigned, hereby request hearings before the Weld County Planning Commission and the Board of County Commissioners concerning the proposed PUD rezoning of the following described unincorporated area of Weld County. PART OF THE WEST HALF, SECTION 29, TOWNSHIP 5 NORTH, RANGE 67 WEST LEGALDESCRIPTION: OF THE 6th P.M. , WELD COUNTY, COLORADO (If additional space is required, attach an additional sheet of this same size or a copy of the deed) SEE ATTACHED PARCEL NUMBER: 0 9 5 7 2 9 0 0 0 0 5 0 (12 digit number-found on TAX I.D.or obtained at the Assessor's Office) NAME OF PROPOSED PUD SUBDIVISION CHALLENGER RANCH P.U.D. EXISTING ZONING "A" AG. PROPOSED ZONING P.U.D. TOTAL ACREAGE 54± ACRES OVERLAY DISTRICTS NONE OPOSED DEVEL PMENT GUIDE SUBMITTA (Specific or Conceptual) SPECIFIC PROPERTY OWNERS OF AREA PROPOSED FOR PUD REZONING: NAME ALBERT CHALLENGER PHONE (303) 674-8422 ADDRESS P.O. BOX 448, EVERGREEN, CO. 80439 NAME PHONE ADDRESS APPLICANT OR AUTHORIZED AGENT(if different than above') NAME ADDRESS HOME TELEPHONE BUSINESS TELEPHONE • If agent is different from the property owner, please submit written documentation from the prop o r / authorizing said agent to represent the owner. i mature: Owner o c'=d�a , = 'gent 8 2000-3077 re\ n 231- tk SHORT, INC n EUTIEn OF n RISSI�� F1,t7 1231-8th Avenue lS W /PJUV?J BUl_5 Greeley, Colorado60631 Telephone (9761356-3101 dAUGUST 9, 2000 ' 400 «a 96021 ELp p N y Ms. JULIE CHESTER — TO DEPARTMENTTOF PLANNING SERVICES CHALLENGER RANCH P.U.D. 1555 NORTH 17th AVFNUE • I GREELEY, CO. 80631' GENTLEMEN: ' — WE ARE SENDING YOU ®XAttached 0 Under separate cover via the following items: O Shop drawings g<Prints 0 Plans 0 Samples 0 Specifications O Copy of letter 0 Change order 0 _ . COPIES DATE NO. DESCRIPTION 3 8-9-2000 'CHALLENGER RANCH P.U.D. • . "CHANGE OF ZONE" APPLICATION APPLICATION FEE $2000 f0 THESE ARE TRANSMITTED as checked below: , ❑ For approval 0 Approved as submitted 0 Resubmit copies for approval XQ For your use 0 Approved as noted 0 Submit copies for distribution — 0 As requested 0 Returned for corrections 0 Return corrected prints- O For review and comment .0 - — ❑ FOR SIDS DUE 19 0 PRINTS RETURNED AFTER LOAN TO US SUBMITTED FOR A "CURSORY)' REVIEW AS TO REQUIRED ITEMS AND ADEQUATE REMARKS INFORMATION TO START THE REVIEW PROCESS • C • OPY TO Al CHAI I FNGFR SIGNED: / , Li! ,_�...- a enclosures ..e net .. noted. kindly notify sat o..«GERALD B. McRA: ,�8, L.S. DEVELOPMENT GUIDE 1 . ENVIRONMENTAL IMPACTS: Environmental impacts from this development should be minimal due to the location, densities and main tocus of the developer. The total tract cbntaining 54 acres, and consists of the following land uses. A. RESIDENTIAL: 9.4 acres for 4 lots for residential units (Lots 2 - 5) . This area lies out of the floodway and has access from prior mining operations permitted under USR 672. B. CONSERVATION AREA -(Divided as follows) : I . 2. 1 acres ' for residential unit ( Lot 1-A) as part of the Conser- vation area for taxing, maintenance and guardianship of the open space. 2. 27.5 acres (Lot i-B) as a Conservation/Agricultural land use area. This is primarily Big Thompson River bottom karid with large trees and natural pasture uses. Minimal improvements of agricultural nature may be made. The area lies within the Flood Fringe of the Big Thompson River and the necessary permits will be obtained. 3. 11 .7 acres (Lot 1-C) as Blue Heron Rookery. This area lies adja- cent to the South edge of the Big Thompson River and the conserva- tion rights have been acquired by Weld County. The East frontage of Lots 1-B and 1-C, along Weld County Road 15= 1/2 have been set aside for a Public Viewing Area of the lake and rookery, and is available for parking and informational uses by Weld County or corporate sponsers, or the Division of Wildlife under the conceptual guidelines. No direct access by the public is to be allowed in order to further protect and enhance the con- servation use. No commercial uses are to be allowed. C. NOISE & VIBRATION AND SMOKE, DUST AND ODOR IMPACT AND HEAT, LIGHT AND GLARE: No commercial or industrial uses are included in this P.U.D. Weld County Road 15-1/2 adjoins on 600 feet, more or less, along the East property line, but has a very low traffic use. The Great Western Railroad has tracts along the East property line, riN but also have minimal use to serve the agricultural areas and trans- port sugar beets to the sugar factories. -2- No additions are being made to the existing uses of vehicle and rail- road use. The residential uses do not add significantly to these concerns. The 5 residences proposed will have a minimal impact as additional landscaping improvements will be added by the owners. 2. RESIDENTIAL IMPACTS: A. ELECTRICAL INTERFERENCE: Utilities to be underground. B. WATER POLLUTION: The area selected for residences lies a minimum of 10 feet above the ground water table. Lots are fairly level and will not produce sur- face runoff. C. WASTE WATER DISPOSAL: Weld County approved Individual Sewage Disposal Systems to be used. An area has been set aside for ISDS to locate them as far from the river as possible and provide room for expansion or replacement systems. D. SOLID WASTE: teTh None, except for residential uses which will be handled with Commer- cial Trash Removal Services. E. AIR POLLUTION: Only residential uses. The internal road will be paved to minimize pollution. 3. SITE FACTORS: A. WETLAND REMOVAL: None. Wetlands are being enhanced and property (Lots 1-B and 1-C) has been offered to Weld County for inclusion in their Wetlands Set- aside property. B. EROSION AND SEDIMENTATION: The. Army Corps of Engineers' evaluation on this stretch of the river has determined that it is "Neutural " in regards to scouring and sedi- mentation and the proposed residential lots will not impact the river. C. VISUAL/AESTHETIC IMPACTS: Other than the 5 residences, the primary featurEsof the "riverbottom land and trees" are protected by the conservation easements. f eSS -3- D. EXCAVATING, FILLING, d GRADING AN.D DRILLING, DITCHING AND DREDGING: The "mineable" portion of the property has been in operation under USR 672 since September 1985. This request for a P.U.D is on the Southerly 54 acres. The mining operation is now complete on this tract and the area has been regraded and landscaped and accepted by the Corp of Engineers. The haul road is now being used for access to the development. One of the gravel pits was incorporated into the river flow system to de-energize flood flows and help protect Weld County Road 15-1/2 from flood damage experienced in the past. The lots lie above the 100-Year Flood level . A "Covenant" to prohi- bit basements is included in Covenants to further minimize damage to the surface. The only ditching to be used might be for agricultural purposes in the Agricultural Conservation area. E. WILDLIFE REMOVAL: With the creation of the conservation easements, the wildlife habitat will not be changed and probably will be enhanced by: prohibiting public access and conservation programs and government and corporate participation. F. NATURAL VEGETATION REMOVAL: As the mining operation and reclamation in this area are now complete, the vegetation has been replanted. The lots are large and will en- courage well landscaped lots. The lot area was previously agricul- tural , but had minimal potential . G. RADIATION/RADIOACTIVE MATERIAL: Based on the Soils Report for the Mining Operation, Alluvial Gravel (50 feet of depth) over shale, produced no significant radiation. F. TRAFFIC IMPACTS: Primary service will be from Weld County Road 54, a paved County Road. Secondary service will be from Weld County Road 15-1/2, a gravel , agri- cultural service road with minimal need for expansion and improvement. -4- II . SERVICE PROVISION IMPACTS: A. SCHOOLS: School District RE-5J Milliken/Johnstown have reviewed the proposal . Five units will have a minimal impact and have suggested a "Voluntary Impact Fee" be considered. B. LAW ENFORCEMENT] Presently by the Weld County Sheriff's Department out of Greeley. C. FIRE PROTECTION/AMBULANCE SERVICE: This area served by the Johnstown Fire Protection District. D. TRANSPORTATION: Internal road system is a private road built to Weld County Standards and paved by the developer. The internal road will be maintained by the Home Owners Association. Weld County Road 54 lies North of the development with road and util- ities access reserved in the sale to Forbes Park. E. TRAFFIC IMPACT ANALYSIS: Develper requests a waiver for this report as there are only 5 units with access to two county roads (Weld County Road 54 and Weld County (^ Road 15-1/2). F. STORM DRAINAGE: All lots are large and will create very small amounts of stormwater runoff. All lots drain towards the river and do not traverse the adjacent lots. G. WATER, UTILITY AND SEWAGE DISPOSAL PROVISIONS: Little Thompson Valley Water District provides "rural type" domestic water service to this area. A co-operative agreement has been reached by 3 adjacent land owners and the District to install a new water line to "upgrade" water service and adding fire hydrants. Electical power and Natural Gas are already in place on or adjacent in the county roads to adequately provide service to the 5 lots. Sewage disposal will be by Weld County approved Individual Sewage Dis- posal Systems. Soils profiles have shown the ground water table at the lot sites to be greater than 10 feet. r -5- f"'1, Ill . LANDSCAPING ELEMENTS: A. "On lot" landscaping will be the responsibility of the lot owners. A 20 foot "landscape easement" has been plAtted adjacent to the private road and a variety of suitable trees and shrubs will be encouraged. As mentioned above, public water is available for domestic use. The state's largest Blue Heron Rookery is located on the Southerly 11 .7 acres. This tract and approximately 1/2 mile of the Big Thomp- son River and adjoining river bottom land, trees and wildlife in the conservation easements will be the focal point of landscaping elements if this P.U.D. is approved. A County Resolution accepting the Deed of Agricultural Conservation Easement (Outlot 1-A Rookery) on Novem- ber 22, 1999. IV. SITE DESIGN: The site design is to protect the natural beauty and Wildlife Habitat of the site including about 1/2 mile of the Big Thompson River. Only 5 lots (2± acres each) on 11-1 /2 acres of the 54.7 acres are being platted to maximize the conservation easement. t"-0‘ This plan is Ln agreement with the Comprehensive Plan and initiates a positive approach to preservation of "open space". A Rezoning Plat is the next step in this process. The plat will reflect the statements and proposal outlined herein. The Flood Plain is the only Overlay District on the property and has been considered in location of the lots and building envelopes. The Conservation Eastments consist of 72%± of the site and is set aside as a natural area. The individual lot owners and Home Owners' Association will have no responsibility in the operation or costs of this area. V. COMMON OPEN SPACE: The common open space requirement has been substituted by a combination wildlife habitat area, Heron Rookery and a Public Viewing area. The wild- life areas are for the natural use of wildlife. Public access is severly limited or prohibited, except in designated areas. The conservation easements are being established for the benefit of open space preservation for the resident of Weld County. The conservation easements are in the form of perpetual easements. e The Home Owners Association is for the residents and will be established before any residences ere sold, with mandatory membership and for any common elements such as the private access road. -6-eThf VI . SIGNAGE: Only treffic signs and a minimum amount of informational signs are to be allowed. Signs will be as required and permitted by Weld County. "Owner" signs will be covered by the Covenants. VII . MUD• MIXED USE DEVELOPMENT: The site is not within any established MUD. VIII . INTERGOVERNMENTAL AGREEMENT IMPACTS: Weld County Planning has sent referral letters to both Johnstown and Milliken. These communities have applauded the size, location and sensi- tivity towards the wildlife and protection of the conservation easements. General approvals were received from the School District, Fire District, Emergency Medical Units and Law Enforement agencies. r r'y fl McRAE & S'HORT, INC. 1231 8th Avenue eTh Greeley, Colorado 80631 ® Telephone (303). 356-3101 Engineering, Surveying, Planning & Land Development RESUBMITTED AUGUST 3, 2000 ATTEN: MS. JULIE CHESTER APRIL 27, 2000 DEPARTMENT OF PLANNING SERVICES PRbJ . NO. 96021 1555 N. 17th AVENUE GREELEY, CO. 80631 RE: P.U.D. SKETCH PLAN CHALLENGER RANCH P.U.D. GENTLEMEN, I ORIGINALLY APPLIED FOR A MINOR SUBDIVISION FOR THIS PROPERTY ON APRIL 15, 1996. PERTINENT DATA CONCERNING THIS SUBMITTAL IS ENCLOSED AS ATTACHMENT "A". THE CONCERNS AND RECOMENDATIONS OF THE RESPONDENTS HAVE BEEN ADDRESSED AND SATISFIED IN THIS NEW SUBMITTAL. es* A) MINING OPERATIONS HAVE BEEN COMPLETED. B) RECLAMATION AND WETLAND ISSUES HAVE BEEN COMPLETED AND ACCEPTED BY THE ARMY CORPS OF ENGINEERS. C) WILDLIFE HABITAT HAS BEEN ENHANCED AND FRAGMENTATION HAS BEEN PREVENTED. D) PROVISIONS FOR FUTURE HABITAT ENHANCEMENT HAS BEEN ALLOWED FOR THROUGH CONSERVATION EASEMENTS AND FUTURE INCLUSION IN WETLAND BANKING AND MITIGATION PROGRAMS. E) FUTURE PUBLIC ENJOYMENT OF RIVER CORRIDOR PROPERTY HAS BEEN PROVIDED FOR. F) CURRENT, HELPFULL AND EXTENSIVE INPUT FROM WELD COUNTY GOVERNMENT, COUNTY COMMISSIONERS, COUNTY LEGAL DEPARTMENT AND PLANNING & ZONING HAVE BEEN INCORPORATED. G) ADDITIONAL HELP WAS RECEIVED FROM COLORADO OPEN LANDS AND COLORADO STATE DIVISION OF WILDLIFE. McRA SHORT, INC. PL CANT GERALD B. McRAE ALBERT S. CHALLENGE ea\ .MCRAE & SHORT, INC. • 1231 8th Avenue Greeley, Colorado 80631 Telephone 970) 356-3101 Engineering, Surveying, Planning & Land Development August 9, 2000 PROJECT NO. 96021 • Ms. Julie Chester Weld County Department of Planning 1555 North 17th Avenue Greeley, Colorado 80631 RE: CHALLENGER RANCH P.U.D. - PART OF THE NORTHWEST QUARTER AND NORTH HALF OF SOUTHWEST QUARTER, SECTION 29, TOWN- SHIP 5 NORTH, RANGE 67 WEST OF THE 6th P.M., WELD COUNTY, COLORADO Dear Ms. Chester, In our meeting on this project last week, one of the items mentioned was an Amendment to the USR Map regarding the Gravel Mining Operation on this tract. The Amended USR 672, filed July 22, 1999, reduced overall size and removed two phases that were not to be mined. Phase II on the Amended USR-672 is on the North end of the original Challen- ger property and is now owned by Milt Forbes. It is the only part of the gravel operation presently being used and will continue for several more years -- until mined out. Phase I on the Amended USR-672 is on the South end of the total property and is owned by Al Challenger. The mining operation on Phase I is now complete. Operations ceased about one year ago and the final inspection on the lands- caping and compliance matters was completed by Mr. Tim Carey of the Corps of Engineers at that time. See attached letter. At our meeting, you indicated that a Second Amended USR-672 Plat would be required to remove Phase I from the Gravel Permit, and allow the Challenger Ranch P.U.O. to proceed, and that you would assist in processing this con- currently with the "Change of Zone" Phase. -2- 1 August 9, 2000 PROJECT NO. 96021 Ms.. Julie Chester Weld County Department of Planning RE: CHALLENGER 'RANCH PU.D. - PART OF THE NORTHWEST QUARTER AND NORTH HALF OF SOUTHWEST QUARTER, SECTION 29, TOWN- SHIP 5 NORTH, RANGE 67 WEST OF THE 6th P.M. , WELD COUNTY, COLORADO. We agree on this and can start the application and map preparation immediately. Thank you for your assistance on the Challenger Ranch P.U.D. Respectfully, to-N Albbrt S. Challenger McRae & Short, Inc. cre-7 !/ Gerald B. McRae 1 . Sent By: TUTTLE APPLEGATE INC ,pti. U;30345227593034526641 ;Aug-B- 13:12; Page 2/2 Y n DEPARTMENT OF THE ARMY.._.,- i — ,�`t' ARMY.-- CORPS OI cR41NCCR0.OMAHA OISTRIGT ..tire TRI-LAKES PROJECT OFFICE,9007 STAY[HWY tat 9 i"� LSTTLATON,COLORADO 001ze-6901 7 •f/(, `"`T To July 9, 1999 ♦TTcrITroR 0v: Mr. Albert Challenger Box 446 Ever. Colorado 80437-0448 Mr. Dick.Coulson Coulon Excavation 3609 North County Road 13 Loveland, Colorado 80538 RE: Albert Challenger Gravel Pit,, Big Thompson River Corps File No. 199680636 Dear Messieurs Challenger and Coulson: Reference is made to your July 6, 1999 site meeting with Mr. Terry McKee of this office concerning restoration requirements regarding the above reference project located in the Southwest t/ of Section 29, Township 5 North, Range 67, Weld County, Colorado. tem During you meeting with Mr. Terry McKee, it was determined that all required restoration measures have been completed. In that regard, all violations at this site have been resolved. No further action, or site visits are required by the Corps of Engineers. Your cooperation in this matter is greatly appreciated. If there are any questions concerning this matter,please contact Mr.Terry McKee at (303)979-4120, and reference Corps File No. 199680636. Sincerely, Tim T. arey Operations onager jb Copies Furnished: Shani Fastin Tuttlegate,Inc. 11990 Grant Street, Suite 304 RE CE EVE U Denver,Colorado 80233 /" JUL 1 2 1999 r`+ f McRAE & SHORT, INC. 1231 8th Avenue reN Greeley, Colorado 80631 ® 1r Telephone (303) 356-2101 ® Engineering, Surveying, Planning & Land Development RESUBMITTED AUGUST 3, 2000 ATTEN: MS. JULIE CHESTER APRIL 27, 2000 DEPARTMENT OF PLANNING SERVICES PROJ . NO. 96b21 1555 N. 17th AVENUE GREELEY, CO. 80631 RE: P.U.D. SKETCH PLAN CHALLENGER RANCH P.U.D. GENTLEMEN, I ORIGINALLY APPLIED FOR A MINOR SUBDIVISION FOR THIS PROPERTY ON APRIL 15, 1996. PERTINENT DATA CONCERNING THIS SUBMITTAL IS ENCLOSED AS ATTACHMENT "A". THE CONCERNS AND RECOMENDATIONS OF THE RESPONDENTS HAVE BEEN ADDRESSED AND SATISFIED IN THIS NEW SUBMITTAL. towN A) MINING OPERATIONS HAVE BEEN COMPLETED. B) RECLAMATION AND WETLAND ISSUES HAVE BEEN COMPLETED AND ACCEPTED BY THE ARMY CORPS OF ENGINEERS. C) WILDLIFE HABITAT HAS BEEN ENHANCED AND FRAGMENTATION HAS BEEN PREVENTED. D) PROVISIONS FOR FUTURE HABITAT ENHANCBMENT HAS BEEN ALLOWED FOR THROUGH CONSERVATION EASEMENTS AND FUTURE INCLUSION IN WETLAND BANKING AND MITIGATION PROGRAMS. E) FUTURE PUBLIC ENJOYMENT OF RIVER CORRIDOR PROPERTY HAS BEEN PROVIDED FOR, F) CURRENT, HELPFULL AND EXTENSIVE INPUT FROM WELD COUNTY GOVERNMENT, COUNTY COMMISSIONERS, COUNTY LEGAL DEPARTMENT AND PLANNING & ZONING HAVE BEEN INCORPORATED. G) ADDITIONAL HELP WAS RECEIVED FROM COLORADO OPEN LANDS AND COLORADO STATE DIVISION OF WILDLIFE. McRA SHORT, INC. PL CANT GERALD B. McRAE ALBERT S. CHALLENGE r. November 2, 2000 Weld County Planning Dep, f NOV 03 2000 Diane M. Houghtaling, P.E. Traffic Engineer RECEIVED 1111 H Street, P.O. Box 758 1� Greeley, CO 80632-0758 RE: Memorandum, May 15, 2000, Comments & Requirements Dear Ms. Houghtaling: Following our meeting on October 31, 2000, I did review your memorandum and our response. I came to the same conclusion that you did. Our response was incomplete and unacceptable. I am taking the following steps to correct these deficiencies and to incorporate your latest request for flood plane impact data. Per your letter: "External Roadway" Gerald McRae is now preparing detailed intersection drawings complete with right-of-way specifics and track to entrance details. "Internal Roadway", "Landscaping", and "Utility Fasements" will be handled as your have specified. "Traffic" with respect to the wildlife viewing area. I am not building a public viewing area. I have given permission to the county to use my land for this purpose if and when they choose to do so. As we discussed, the development of this area would be at the county's option and expense. "Drainage" Immediately following our meeting, I retained TuttleApplegate, Inc. to prepare a detailed drainage plan for this project. I also informed Mr. Larry Owen, P.E., of your concerns relevant to the recent mining activities and their impact upon my flood plane boundaries. Mr. Owens has assured me that he is aware of what you are requesting and I have therefore also ordered a flood plane impact report for your review. These documents will be on your desk within five (5) business days. Sincerely, , Albert S. Challenger A.SC/lc cc: Julie Chester Larry C. Owen blue heron AND NOT#vpath *\_vli_*in/w...&e/wildlife in danger/sandhill_cranelktlhx//www.dnrstate.co.us/wildlife/div_..e/div_search/query.asp&CiHiliteType=Full COL, sram4 ir Z I -an 0 iv ion of Wildlife 40 ()tip:ima .tii ttwtJralfilewinces Coorado Divr foes �0�6'WaldTafe lour W. Mannruct, Director Selected Colorado's Wildlife items Query blue heron AND NOT#vpath *\_vti * against document /wildlife/t&e/wildlliife in danger/sandhill crane.htm You can navigate between the hits using the "<<" and ">>" tags around a hit. Clicking "«" takes you to the previous hit, clicking ">>" takes you to the next hit. Click to no to the first hit in the document. New Query Sandhill Crane Grus canadensis tabida (Species of Special Concern) The greater sandhill crane is a very large bird with long legs and a long neck and it measures about four feet tall and weighs approximately 12 pounds. It is slate gray in color and has a red patch of skin on the forehead. Greater sandhill cranes are sometimes confused with the great << blue heron>> , a bird that's similar in both size and color; but the distinction is easy to make when they are in flight. While the heron pulls its head up and back, forming an "S" with its neck, the crane's neck is fully extended in a straight line with the body during flight. The greater sandhill crane population is estimated to be 25,000 birds, and approximately 15,000 of them occur in the Rocky Mountain regions of Canada as well as in the states Idaho, Wyoming, Utah, Montana and Colorado. The San Luis Valley of Colorado is a major stopover point for spring and fall migrations. Greater sandhill's nesting habitats are mostly marshes and willow-lined drainages in high mountain meadows, but the crane's breeding range in Colorado has shrunk to a small portion of five counties in the northwestern part of the state. Colorado's nesting population appears now to be about 40 pairs. The population decline in Colorado is the result of human settlement. As people moved in, much of the r+, nesting habitat became unsuitable because of either direct or indirect human disturbance during the [ incubation and chick-rearing periods, resulting in nest abandonment and loss of young. Additionally, many of the cranes were shot for food. 11/27/2000 11:46 AM blue heron AND NOT#vpath*\_vti_*in/w...&e/wildlife in danger/sandhill_crane] lipx//www.dnr.sfate.co.us/wildlife/div_...e/div_search/query.asp&CiHiliteType=Full The Colorado Division of Wildlife began to address a serious decline in the state's greater sandhill crane breeding population in the mid-1970s through habitat protection and the monitoring of stopover r" sites and nesting areas. The Division's objective is to increase the number of nesting pairs to a level that will ensure a long-term, self-sustaining breeding population in Colorado. The sandhill crane is slightly smaller than the whooping crane, lacks the black wing tips and is gray rather than white. it has a six-foot wingspan. BACK TO "WILDLIFE IN DANGER" HOME PAGE BACK TO THREATENED AND ENDANGERED SPECIES PAGE er‘ Return to [Wildlife] 2 of 2 11/27/2000 11:46 AM A ) Yq LL. l l B k,� \i)., 14 / i . � VXV 1 / / t r1 .I r• 1 \I\ \---'1.:?. • ., 1 1 ..•\ �k t / iJ 11 �`b , / i Y s I f } nl 4 1� 1 A" 4 r'/ N p j 1 t 1 .� t I + C 'l a 'r" .EAR Ts"�t� St er R''�AF J,' ,. "ere!".a5, it'g.,, PW 14?Y.wfF1'i41J:F'S1,4'`y;i DRAINAGE ° PORT CHALLENGER RANCH P.U.D. Portions of the Northwest Quarter and the North Half of the Southwest Quarter of Section 29, Township 5 North, kluge 67 West of the 6t Principal Meridian, Weld County, Colorado Prepared for; Mr. Albert S. Challenger - P.O.Box 448 Evergreen, CO 80437 .• Prepared by: TuttleApplegate,Inc.. 11990 Grant Street; Suite 304 Denver, CO 80233 Novemi er,.2000 • Project No. 00-250 Challenger Ranch P.U.D. Drainage Report TABLE OF CONTENTS CERTIFICATION 1 GENERAL PROJECT INFORMATION 2 PROJECT LOCATION 2 PROJECT DESCRIPTION 2 DRAINAGE BASINS 3 OFF-SITE DRAINAGE BASINS 3 HISTORICAL ON-SITE DRAINAGE BASIN 3 DEVELOPED DRAINAGE BASINS 3 r"s FLOOD PLAIN ANALYSIS 4 DRAINAGE DESIGN CRITERIA 4 GENERAL CRITERIA 4 HYDROLOGIC CRITERIA 4 DRAINAGE FACILITIES DESIGN 5 CONCLUSIONS 6 FIGURES TABLES APPENDIX Challenger Ranch P.U.D. Drainage Report CERTIFICATION I, Larry C. Owen, P.E., hereby certify that this Drainage Report for the Challenger Ranch P.U.D., located in Weld County, Colorado, was prepared by me or under my direct supervision, in accordance with the provisions of Weld County Subdivision Ordinance, dated February 9, 1999. Alt numuuunrp 9z 29871 Avoire amumim Larry C. Owen, P.E. Registered Professional Engineer State of Colorado No. 29871 re" Tuttle Applegate,Inc. 1 November 10,20O0 Challenger Ranch P.U.D. Drainage Report GENERAL PROJECT INFORMATION PROJECT LOCATION The Challenger Ranch P.U.D. is located in Weld County, Colorado and comprises portions of the Northwest '/4 and the North Y: of the Southwest '/ of Section 29, Township 5 North, Range 67 West of the 6th Principal Meridian. The site lies between Weld County Road (WCR) 52 and WCR 54, west of WCR 15'/2, and is bounded on the east by a branch line of the Great Western Railway and on the west by the Big Thompson River valley. The entrance to the site is located on WCR 15'/2, approximately 2/3 of a mile south of WCR 54. The location of the project site is shown on Figure 1. PROJECT DESCRIPTION The total project covers an area of approximately 54.1 acres. A portion of the project site is to be developed into five residential parcels and an associated access road. This development will comprise approximately 14.9 acres (11.5 acres of residential lots and 3.4 acres of road right-of- way). The remaining 39.2 acres will be reserved as two outlots, under a conservation easement. r' Of the 11.5 acres designated for residential development, approximately 2.8 acres (24.3%) is undevelopable, in that it lies within the 100-year flood plain of the Big Thompson River. Therefore, a net area of only 8.7 acres will be available for residential development. The site slopes gently from east to west at a uniform grade of approximately 1.3%. The surface gradient steepens slightly near the western boundary of the proposed residential properties, entering the Big Thompson River valley. The outlots and the western portions of Lots 3, 4 and 5 (approximately 50% of lots 3 and 4, and approximately 20% of lot 5) are within the 100-year flood plain. A portion of the southern region of Outlot 1-B has recently been mined to recover the gravel resource from the river valley. The mined area has been reclaimed and is now flooded, forming a lateral lake adjacent to the main river channel. The balance of die outlot areas remain in natural condition, with a mix of riparian and wetland vegetation along the main river channel and a former channel. This former channel remains as an extended oxbow generally defining the eastern boundary of the flood plain. The site soils are classified by the U.S. Department of Agriculture (USDA) Soil Conservation Service (SCS) as "Kim loam". These soils are described as a mix of eolian deposits and parent sediments from a wide variety of bedrock. The soils are generally characterized as loam, underlain by clay loam, underlain by fine sandy loam. Permeability is moderate and surface runoff is generally slow, with low erosion hazard. For purposes of assessing storm runoff from the site, the soils are classified as Hydrologic Soil Group "B". Tuttle Applegate,Inc. 2 November 10,2000 Challenger Ranch P.U.D. r Drainage Report DRAINAGE BASINS OFF-SITE DRAINAGE BASINS The site represents a small portion of the eastern slope of the much larger Big Thompson River Basin. However, despite the downgradient location of the site and its proximity to the river, there is no tributary flow onto the site from immediately upstream areas. The site is protected from upstream runoff by a variety of surface improvements in the vicinity of the site; first by the presence of the Hill and Brush Ditch, then by WCR 15%2 and finally by the Great Western Railroad line. All of these improvements intercept overland flow from higher areas to the northeast and divert the runoff to the southeast, away from the site. The only drainage to be addressed in connection with the development is that from precipitation that falls directly onto the site. A small tributary branch of the Big Thompson River flows through the western portion of three of the proposed lots (Lots 3, 4 and 5), but this channel is downgradient of the developable portion of the site, within the floodplain, and drains only a minor catchment area, including the residential portion of the site. The tributary catchment area that is outside the bounds of the r, development area of the project site will remained in a natural state and the runoff from this unaltered area is part of the historical runoff from the site. HISTORICAL ON-SITE DRAINAGE BASIN For purposes of assessing incremental runoff from the site, as a result of the proposed development, only one historical drainage basin need be considered. All of the developable area of the site, including the proposed access road, is within a single, generally consistent area. The agricultural land comprising the majority of the site, and which has historically been planted in alfalfa, slopes at a relatively consistent grade throughout and is underlain by consistently similar soils. There is a gravel access road along the eastern boundary of the agricultural area (along essentially the same alignment as the proposed road to serve the residential lots). This road drains onto the agricultural area and then to the river. For all intents and purposes, the drainage parameters for the entire development area are consistent. DEVELOPED DRAINAGE BASINS For drainage purposes, the developed site will be subdivided into six drainage basins. This drainage area subdivision reflects the practicalities of managing storm water runoff from the site. Each of the developed lots will most easily be drained individually toward the river, with separate detention facilities, as appropriate, and without encroaching on adjacent parcels, and runoff from the road will most easily be collected to a distinct detention facility, also without encroaching on the residential parcels. Tuttle Applegate,Inc. 3 November 10,2000 Challenger Ranch P.U.D. rig` Drainage Report FLOOD PLAIN ANALYSIS Delineation of the Big Thompson River flood plain boundary, in the vicinity of the project site, is based on the Flood Insurance Rate Map for this portion of Weld County (Panel 0'80266 0615C, dated September 28, 1982) and aerial photographs of the site and surrounding area showing post- mining conditions. Potential alteration of the flood plain limits, due to topographic changes effected by the mining operations south of the proposed residential parcels, was investigated as part of the Flood Hazard Development Permit (FHDP) submitted for the Challenger Pit mining operations. The mining activities and the resultant lake have increased the flood attenuation capacity of the river channel, in the vicinity of the site. Examination of the available evidence of current conditions indicates that the flood limits have not been altered by the recent mining operations in the area, and that the FHDP remains valid. Additionally, it should be noted that all of the designated building envelopes for the residential development are located outside of the 100-year flood plain. DRAINAGE DESIGN CRITERIA GENERAL CRITERIA The criteria used for assessment of storm runoff and specification of the required storm water management facilities for this project are in accordance with the requirements of the Weld County Subdivision Ordinance (latest revision). Assessment of storm drainage and specification of mitigating storm water management facilities are based on the premise that runoff from the developed areas of the site will be returned, ultimately, to the historic receiving channel, namely; the Big Thompson River (or branch channels thereof), at a rate not exceeding the historic runoff rate. By so doing, any potential hydrologic impacts to downstream areas, resulting from development of the site,will be minimized. HYDROLOGIC CRITERIA The design rainfall events for assessment of runoff and design of mitigating storm water management facilities for this project are the 5-year and 100-year return interval storms. Data obtained from the NOAA Precipitation Frequency Atlas, Vol. III (Colorado), indicates that the 24-hour precipitation depths for these design storms are 2.6 inches and 4.8 inches, respectively. Runoff resulting from such storms, for the historic and developed conditions in each drainage basin,were determined in accordance with Technical Release 55 (TR-55) from the USDA, SCS. The soils underlying the site are classified as Hydrologic Soil Group "B". The appropriate SCS curve number (CN) for the undeveloped condition is 75, reflecting agricultural land, with small grain crops, planted in straight rows, in good condition. The peak runoff rates for the historic condition were determined to be 0.443 cfs/ac for the 5-year storm event and 1.539 cfs/ac for the Tuttle Applegate,Inc. 4 November 10,2000 Challenger Ranch P.U.D. r"�` Drainage Report 100-year storm event. The appropriate SCS curve number for the residential lots is 77, reflecting low-density development (15 — 18% impervious surfaces), and the appropriate CN for the access road is 89, reflecting a paved road with open ditches. The peak runoff rates for the residential area were calculated to be 0.550 cfs/ac and 1.850 cfs/ac for the 5-year and 100-year storms, respectively, and the corresponding peak runoff rates for the access road were calculated to be 2.144 cfs/ac and 5.270 cfs/ac. A summary of results from the drainage assessment is presented in Table 1. Detailed calculations and reference information are included in the Appendix to this report. DRAINAGE FACILITIES DESIGN As indicated above, the developed site will be subdivided into six separate drainage basins, corresponding to the respective residential lots and the adjacent access road serving those lots. Development covenants will be implemented, requiring that grading and landscaping of the individual lots be performed in such a way that all storm water runoff from a given lot be confined to that lot, and routed through a distinct, on-site detention basin, with appropriately C sized outlet control facilities. Storm runoff from the access road will be collected in roadside ditches and routed to a detention basin adjacent to the south end o€the road right-of-way, and then discharged to the river channel at a controlled rate. These measures will ensure that the quality of storm runoff entering the river channel, and the rate at which such flows enter the channel, do not result in detrimental impacts to downstream areas. Design of the storm water management facilities for the residential parcels reflects the fact that the western portions of Lots 3, 4 and 5 are within the 100-year flood plain and will not be developed. These areas will remain essentially unchanged from the historic condition and, thus, are not accounted for in the calculation of required detention capacity or allowable release rate. Specific design of the detention facilities for the respective lots will be part of the site-specific grading and landscaping designs for those lots and, as such, are not provided in this report. It is anticipated, however, that detention facilities will consist of a grassed depression near the western boundary of the developable portion of the lot, with an appropriate outlet structure and discharge piping or surface channel to convey outflow to the adjacent river valley and ultimately to the river channel. Required detention capacities and allowable release rates for the respective lots are presented in Table 1. Detention requirements for the 100-year storm event range from approximately 0.05 to 0.08 acre-feet (2,180 to 3,485 cubic feet). Such a volume could be accommodated in a depression area approximately 40 to 50 feet square and 1.5 feet deep. Such a facility can be readily incorporated into each of the proposed properties. r Tuttle Applegate,Inc. 5 November 10,2O00 Challenger Ranch P.U.D. Drainage Report CONCLUSIONS This Drainage Report was prepared in accordance with the requirements set forth in Section 10— "Design Standards" of the Weld County Design Criteria. The analysis and designs contained herein indicate that the proposed development will not result in any adverse impacts to properties adjacent to or downstream of the Challenger Ranch P.U.D. r Tuttle Applegate,Inc. 6 November 10,2000 FIGURES r CM C, r E 0 ds 0 it / c`....%! rte ``.^ - `' t� � } i /) �= t N �L/ �j �a `\° 5 i \ \ , 4} t J i s "` . L _ o Ds, *\ 1V��tI� } ,` L ✓ • rofr t \ I' A9A0 Y ; 4 r 1: J I `+ "so � N 'l --- .w'^.._ 1 /� kd 1 2 4 , / ----\ ',,, t" t ; ITE -Th '% _ f a ti 1 4� + } �.� I w ,/'.. ≥ 'Tk a♦ ii \ `\ i,4 f 773 ��`` Th. `' r \ ; 48 � L' l �Z 1 4772 �? '_ t r :� - I �, a ) ) y- fit. ! y� . i ``..�1 k \..r y; ..r +r/"" ,\,,,, *,) ; J f !� en a@/O "'! o .1776 J # t ' j ) ''t 44. ,- 7 , \ s--,_,,..„ \`- is i \\ 1 \ %, f `` 1 / aaoo� z I rem isamm 1 DS 11/tOite Jab D. Do-200 ALBERT S. CHALLENGER TuttleAppkegateOnlc. D... wit It= caviu.....fee lad..m.il..aw.. D.4. WO CHALLENGER'RANCH P.U.D. ,4 ,,= Dr.z WO d u.coaviswv-smala r u.v.•r<.V®me n. Wawa" \ / M3)4524610 FAX:(303)452-2759 bit ttIS r i ` T I ,_,5,-2.,-H___>..-.17-'142, I. xa F" "r ^"ed /r''� , ,o- v y �� Yt' rr '' . . e ,)•;.;.;.. 2.2,,,,c,..22,222,22--!...2 ms' iL , ! rx� a y. y I 1 „ �A.' J Y `'.4-:-5.." i J W I. s 'I Fr A p, V • 7. . yy. • jot r TABLES lam' r Table 1 CHALLENGER RANCH P.U.D. Storm Runoff and Detention Summary (Developable Area) Drain y Basin Designation Lot 1-A Lot 2 Lot 3 Lot 4 Lot 5 Access Rd. Total Parcel Area Tac) 2.1 2.0 2.7 2,6 2.1 3,0 Developable�pable a (ac) 2.1 2.0 1.5 1.4 1.7 3.0 Histofii Runoff`(cfk " --yr Storm (0.443-cfs/ac) 0.93 0.89 0.66 0:62 0.75 1.33 1Wy .Stop ji 5 9 cfs/ac) 3.23 3:08 2.31 2.15 2.62 4.62 Developed Runoff-(cfs) -_Residential_Area_ - 5-yratonti(l-cfs/ac) 1.16 1.10 0.83 0.77 0.94 100=yr Storm (1 850 cfs/ac) 3.89 3,70 2.78 2.59 3.15 Access Rod 5 yr Storm (2.144 cfs/ac) 6.43 109-yFStorm 5.270 0fs/ac) 15.81 Regweedwred-Detention-Volume (ac.ftt) -Residential Area 5=yrr S rrti 0.012 ac.f/ac) 0 025 0.024 0.018 0.017 0.020 100-LSt ftn (0:038 ac:ft/ac) 0.080 0.076 0.057 0.053 0'065 -Access ROB -.5-11-StSH4il0"06049.1 IO) 0.180 - 100-yr Storm (0.119 ac.ft/ac) 0157 Allowable Release Rale(cfs) -5-yr Ston (0.443 cfs/ac) 0.93 0.89 0.66 0.62 0.75 1.33 t00-yr Storm(1.539 cfs/ac) 3.23 3.08 2.31 2.15 2.62 4.62 Note: Undevelopable areas of the site will not be altered from the historic condition by the proposed development and, therefore, are not addressed in the assessment of drainage impacts due to the development or specification of required mitigating measures. APPENDIX Client: ,Q2 Cs tznJcc.e Job No: 00 - 2410 Project: �1f,4ViF./de- .R,t/CG/ Po et.). By: eo pate: /God so Description: ,�J,e4im✓.9GF tco.cT• Chk: Date: P", a gate,Inc. Page: 1_,of: S 6N , ✓e,1 /// eui,, JClC.eie 75 test enial AA QIJd aree SS PI ad_ -c-ac17 w/%Ze selarak"� 06-aa a t s ✓��4� Q elm/c a.4,-,;/,925-1 eC . /4(y's ae (�/<�/�aod ie� = 2.9c c (el edse'ewe /1 leaAiac-1-4/er3) - e eve/a,1a4& restd Y: c aCC - ande</e o 6/e tr_z-c7°' : et at. (u'%ir Iced pan?) -Exist/nf+' !R/JG�-ec e ,� cu r/'aka "//7 (4.(f�-67 ) - ,@-0/0sc d 64d-cafe ,t.4 es/a restenli - ,174,.x ,s "`oast/ (QCs sae...tr04 te9 Bryn¢%%/ 074.0-no re e44.7 - /Gbh yr fl Ar .1,74.7,0 'ecc 4,5„, e•-• 0/ _ncay • *'I%/oflcs /en* 74,,,,,, ca.r>l .4 c est a," •-•/.5e -jraiJa/e e • q an's son ✓ee, 404ch .Lr&er s zees/✓ / / / - ruri on nen� Atan0 fry areas /s free ct/eX /4. .ligcese4 / //cA, ifee /s*, and D Gr12/ a/ernP, -67/ e /01 ce..e)-r ems/arc/ of sire. {i u/7`'ai -a oan aed As ,Ir/e// %07 and df Ne.Yeee -r4:0 li'-C, - .s3h , °wed (az&//A-) - ,C.pa ro£"crarnc ol+rrc4' . / et 77zan s--on Oi%e/'. S'CS' &a ✓e numv�er CA/ 7s �a ra ra, , s1r 6/ro ut, try odc ndi) Trs1 ice/ as/ra-:.h7 -Far d✓'7? / l/ — 11990 Grant Street, Suite 304 • Denver, Colorado 80233 • (303) 452-6611 • Fax (303) 452-2759 Client: Job No: 00- at ,=== L.= Project: By: /CO Date: /1 of-ex) Description: Chk: Date: Tu tleApplegate,lnc. Page: 9 of: .6- - 7-'071;77 Ay-.(ni z,c etc.-776 /000 -/0 c 533 N.; - ,��a7f° 174 - 4 c y- t i- a4-/n (Pi e‘/...7) p - (2d -,G,47)t O7/.n f`/J ?6-.467- 3.3. -ete-'� /� ld</ -yr LT-%- �+/ -r (/�r 174 ) - l Y•� a.a7� Z G.4e,/, y A.- O'.447t 33 - /irne o,7d oncc/7 tra 4on of = 0,00 7(n/) ?c a.. e" s = o 7 _ 1 sao � 0o (' s4J) S r- a 0/3 //.Z17t( 0.0/3{'" 9.69 hys. tan yfr = J^k .4,. Q A; u = -O0 es/77,4s � pi 0 p / ° leo cs�7/,9 ar /oo cr Ziarin. g390 (O.oc/la/)(a7/)(/.o) F = /0 (7canS OPJCJam/ �= o) . - 70 Cfa/ac y�S doe = 1Zo 'a.00/4707)0 a 0 = j$ 4c 11990 Grant Street, Suite 304 • Denver, Colorado 80233 • (303) 452-6611 • Fax (303) 452-2759 Client: Job No: 00-2S-0 Project: By: hero Date: 1119-en Description: Chk: Date: 7tIeApplegate,Inc. Page: of: 5� 4 e/ELo i?n C ,vJ,n d 2074 /-C W///be de'e//ect a3 es/laic rewo'eri/ra� j ere/3. /q t- -a5S rna Do/l/ , !Jaded ell'euiole laid.. ¢' rc?�/C/ s �o�eci. sand grrasaed rcrtdzti-de J6e,-nw) 1es, ti - �'3 ��}rdc num1er f4- 'es/6)&4a-i fiteer-A/os (7Yac ac,.e%Gi) = 77 7z-h- roaat // -76a✓ecC e eyen a'��c1i m = _Z7-744&/ v/sira.c7ion.'i // / - rescdcnAct.-( o�e -4;s) (C�/. 77) - Tar access rroaj(CA/ ` `9/ a.2 iry ..PoY"G/7 Q-G ena e /C/7Cr�{7OrJ p ,-e ct/cn�ia�� areas .J=zO o -/a - ,ldr c2CceJSrev-7c4 S- .%000 -/0 - IL2.9�/rr g9 - ,kiln on r resz.den cJ areas Q.S= (C -..�• .e a:2 o.. it; d - o.S ?7f:e?? /oD o.517 ,L flf fj z - far access road Qs = (2,G- .en) _ /641,,;, " .?writ , 2f77f'l ei - 7:74-7e cor/ce✓/rct ire° ntsc - f-e fen A -( aireas /� F D.oc (Loci\) = D. ‘eXp3. )i.1 Y ll o access road / = OOojceas1/(3ao)J O.//ks 11990 Grant Street, Suite 304 • Denver, Colorado 80233 • (303) 452-6611 • Fax (303) 452-2759 Client: Job No: OO -2CC =. = Project: By: / O Date: //-°T-� =s:— Description: Chk: Date: rte,. 7htttleApplegate,lnc. Page: / /csLC{c.->�i�x( a.'ea • n K - �as/3/47 �qs sr s �f s = (O'oo j)(o j2)%) =o /sc ° 17 = /h 4r /oo yr ;z 176/rw ° tro (O oo/6XZfilX/.o) _ / So 44 fit .oe = 94 (0.00,th,- o) r 2 A4. d,e7en/;r o t/ 9)!/ �csUG� a/ area.. - ,.Cr Syr a,74,-rn e✓ i-7/ - a aii. ; (73 etec . a tacia� = 0 Aterr7 acJ loin c o r'n? 7 c e4 .ed co ra/di.; ¶ oat at. / = O.jrf1S = 0, 0.550 - %y/c v..4rni k = d./d // Kr- - .5-3.331/P A twto ✓o/urne S3.3310.da/v/��•'', 0,00/C!,m%) a of ac• # 414- - ✓ = Q.Oa(e,0, O/2 /��c (S35{1�te� &ara je k 'store ac •i a / f-or /op-c/r s only c%rry- /s/cs jac �/ = o,is- �y, _ /erS cc/ac 0°Q,. te., - ✓=S3.33(2oe)(0•O0/G) = a 2/ ac /a.e. - / = O. 7r(0•M It 0, algae•4/a (dA ,4/ae) 11990 Grant Street, Suite 304 • Denver, Colorado 80233 • (303) 452-6611 • Fax (303) 452-2759 Client: Job No: Ce-2l'O ;;;= Project: By: le-O Date: /Lof-co Description: Chk: Date: ThttleApplegate,Inc. Page: S of: S access rco of - For 5-yr. a4/nrin en,e177 13 o,,e-13 c4/ae may. = 2,,V atD/ac O''i't'.5 r O.2aJ rne 1 r .sB.ss(/-sdo,00nc) c O./31 ac •tf/R.c.. = a$s tel = o.o& ac .4/c. ( ens/74%) - ,C /O0-yrs ro elan / e -C . C S.27 c4/ac. C /s5/ = O,Ole 5;77 - t/ = 55.33(5 5p ,x0.004 = O. jog a Q..19jt e. -�0 t4 = o.3es(o-39) = O, //9a.c;AZ (sit P/ C 11990 Grant Street, Suite 304 • Denver, Colorado 80233 • (303) 452-6611 • Fax (303) 452-2759 Hello