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Home My WebLink AboutSUNDERING TOWNHOMES PUD SECOND - Filed GC-GENERAL CORRESPONDENCE - 2011-12-29STEWART&ASSOCIATES Consulting Engineers and Surveyors March 2, 1992 Mr. Glen Schlueter Storm Drainage Utility City of Fort Collins P.O. Box 580 Fort Collins, Colorado 80522 Dear Glen: This is regarding the storm drainage for Lots 12 through 23, Sundering Townhomes P.U.D. , Second Filing, located at the corner of Hill Pond Road and Shire Court. There are presently four three —unit buildings approved on Chetwood Court, and the owner is replatting each set of three attached units into two detached single family lots. In other words, the density is being reduced from twelve units to eight units. The site is situate in the Spring Creek Drainage Basin. Engineering Professionals, Inc. prepared the original utility, grading and drainage plans which were approved by the City of Fort Collins on November 25, 1985. The grading and drainage plan is shown on Sheet 6 of 7 sheets of their plans. The lots are located in sub —basins D-7 and D-8. Chetwood Drive will be constructed as per Sheet 5 of 7 of the E.P.I. plans which drains from East to West to Shire Court. Sub —basin D-8 drains on the surface to Hill Pond Road. At the East end of Hill Pond Road, a drainage swale carries the storm drainage Northeasterly to the existing ponds on Spring Creek. The construction plans for the drainage swale are also shown on Sheet 6 of 7 of the E.P.I. plans. The storm water runoff will not be increased by this replat. The eight replated lots have the same area as the twelve original lots. The building envelopes are also the same size. The grading plan shown on Sheet 6 of 7 will stay the same for the detached houses. Tract "B" which is the open space surrounding the replatted lots was dedicated as a drainage easement on the Second Filing plan. The Replat does not change any part of the original E.P.I. plans will be used for facilities and for grading the site. James H. Stewart and Associates, Inc. 214 N. Howes Street PO. Box 429 Ft, Collins, CO 80522 303/482-9331 the drainage plans; therefore, construction of the drainage �W Mr. Glen Schleuter Lots 12 through 23 Sundering Townhomes P. U.D. , Second Filing March 2, 1992 Page 2 An erosion control plan was not required in 1985 when the plans were approved; therefore, an erosion control report is being submitted at this time. If you have any questions concerning this site, please call. Sincerely, a L � Richard A. Rutherford, P. E. & L.S. President jrr enclosures Njj�y''�. =*• 5023 = M In EROSION CONTROL The Replat of Lots 12 through 23, Sundering Townhomes P.M. D. Second Filing contains 1.67 acres and will have eight single family residences. It is divided into two sub —basins for drainage computations, and they are a part of eight sub —basins that were designed by Engineering Professionals, Inc. in November 1985. The site was graded for the construction of the units in 1986 along with the units that have been completed. The 1.67 acre cul—de—sac has a moderate ground cover of grass and weeds. Chetwood Drive has not been rough cut, and it will be the only area that will be stripped. As soon as the water and sewer mains and services are completed, the sidewalks will be constructed and the base and paving will be placed. Since there is no overlot grading, the remaining ground cover will be maintained until the excavation for each single family house foundation is done. The foundation will then interrupt any erosion. Therefore, the 0.35 acres of proposed paving is the only area that will have to have some erosion control devices to prohibit any silt from entering the existing Shire Court paving. Straw bales will be placed at the Easterly end of the existing radii at the corner of Shire Court and Chetwood Drive. While the street is rough cut and prior to base being placed, the runoff will be trapped at a lower elevation than the existing street and will not flow onto Shire Court. The site is in a moderate wind erodibility area. The curbs, pavement and foundations will prevent wind erosion. RAINFALL PERFORMANCE STANDARD EVALUATION IPROJECT: lCOMPLETED H2(> Z3------------------------------- ToWN HOMES -'. v, D., S Eca,u- S`v DGi-1 v& STANDARD FORM A BY: --------------- DATE: 3 z Z (DEVELOPED ERODIBILITYI Asb ( + ZONE I ( ) Lsb I Ssb Lb Sb I PS ISUBBASIN ------ -- ------ ----- I (ft) I W feet ) ( q ) I (-� ) b-7 --- ¢--I------ N��,� O.G A�.( 3Zo' 1 0.81 -------------- I I I 03Ac. I_I I I IZ77I I . ---------------------------------------------------- - - - - -- -A------� ---EFFECTIVENESS-CALCULATIONS — PROJECT: RE P� AT L o rs /Z THE o Z 3, Sv�v pe e,N� STANDARD FORM B T—o W,v H O M E.s P. U. D. S E c oN p COMPLETED BY: Q A C DATE: 3 a y Z Erosion Control C-Factor P-Factor Method Value Value Comment ________________ ------ .STIZLC—TJ G!%&k-x D, f EXr1T, Gr-ov.vc) covce- o, Lo l, UD �AP67 fo►l. /,00 /SOD ST2 ,gttJ BALe� BARpE12 /, 00 0,8a MAJORS PS. --- SUB --- AREA ---------------------------------------------- BASIN (0) BASIN` (Ac) CALCULATIONS ----- I ------ ----------------- - j 7 8' � �� % LU r a, G FA c ro e----------------------- �OSI x�ol) t (D%9Lx o.+q + (o.2oA /.o)- / & -I w7'o, .ham- FAA - TOR- : /Xo,e = 0,8 E FF. = (/'-0, 35 X0.g) X/ao - 70.0 %a I------B--------------------------------------------------------------8-19 CONSTRUCTION SEQUENCE PROJECT: RC -PLAT COTS IZ -rHRu 63,- SuNDE;aIlve. TawvNoMEs STANDARD FORM C PU, D., SccoNo F/LiN6 SEQUENCE. FOR 19 9 Z ONLY COMPLETED BY: R A Z DATE: 3/ Indicate by use of a bar line or symbols when erosion control measures will be installed. Major modifications to an approved schedule may require submitting a new schedule for approval by the City Engineer. 1 q9 Z YEAR MONTH ----- OVERLOT GRADING WINO EROSION CONTROL Soil Roughing Perimeter Barrier Additional Barriers Vegetative Methods Soil Sealant Other RAINFALL EROSION CONTROL STRUCTURAL: Sediment Trap/Basin Inlet Filters Straw Barriers Silt Fence Barriers Sand Bags Bare Soil Preparation Contour Furrows Terracing Asphalt/Concrete,Paving Other VEGETATIVE: Permanent Seed Planting Mulching/Sealant Temporary Seed Planting Sod Installation Nettings/Mats/Blankets Other /I\I A I M IJ IJ 1A IS l D Iti I D ----------------------------------------------------------- STRUCTURES: INSTALLED BY MAINTAINED BY VEGETATION/MULCHING CONTRACTOR DATE SUBMITTED APPROVED BY CITY OF FORT COLLINS ON HOI/SF-C:1989 JANLA_aY 1991 8-20 DESIGN CRITERIA .rd. REALTY. INC. of For, Collins March 4, 1992 Mr. Glen Schlueter Stormwater L'tili*-v 235 Mathews Fort Collins, CO 80524 sear Mr. Schlueter, Recently we requested permission to excavate for foundations for 907 and 901 Shire Court located in Sundering Townhomes, PLD, 2nd riling. The permits were denied because of an offsite develenment requirement to install a storm drainage ditch along an easement throuah the property located directly o� un r� di_ ect_y east _ Sunderi -1 T� ae- � a_nd_ng '- that one improvement would be release of building -1 g. � . -Vas 7,V completed prior to the permits for the final 5 units in Sundering. After t.e..; e� ig the n- i �,e�e_ -. d cpment agreement, mpr iovement is not specifically r the storm drainage mentioned in prior to the start of the last 5 townhomes. terms of completion 4tem in Amendment Agreement No. 2 However, Paragraph Pa_ ag. aph 3 , improvement to be delayed by the language, may allow fen the 'f T - ; understand that the storm, drainage must be I. + bum not limited �o" g do it, including extending it to the competed and agree to point currently ends. Hopefully, t.e task can where Hill Pond Road be delayed until the development work is underway `or Chetwood Circle, later At the same time, I'd liketolook into this year. the possibility payback provision for 1/2 of the cost of the of a drainage from the future developer on the adjacent improvement property. Enclosed is a copy of the easement for the storm drainage. The reception number (85050644) on the recorded easement matches the reception number referred to on the workingr draw_n a for o� Sundering Townhomes. Hopefully, that means an accurate description for the easement is recorded and it is the proper one for the job Since e-lv, Jphn McCoy Owner Sundering Townhomes. Buiidinq i - =irs� Floor 3665 John F. Kennedy Pkwy. For` Collins, Coloraao 80525 (303) 226-5 ^ 1 Independently Owned and Oaerated