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HomeMy WebLinkAboutRAMADA LIMITED SUITES PUD - PRELIMINARY/FINAL - 16-96 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTRunoff from the detention pond will be to the existing storm drain manhole at Boardwalk Drive and South Mason Street. Overtopping of Pond 1 will be north to Pond 2 in the parking area. Overtopping of Pond 2 will be North in the parking area to Pond 3. Overtopping of Pond 3 and 4 will be to South Mason Street. EROSION CONTROL: The sequence of construction for this project will be in one phase.. The site will be overlot graded. Next the foundation and utilities will be constructed; then curbs, parking, and walks; then asphalt and finally the landscaping. The project is scheduled to be completed early 1997. This site is in a moderate to high rainfall erodibility zone. A silt fence will be constructed prior to construction as shown on the plans. After the storm drain inlets have been constructed, straw bales will be place around the inlets and remain in place until the site is completed. This site is in a moderate wind erodibility zone. The buildings and curbs will be constructed as soon as possible after overlot grading and along with the said silt fence will help control wind ' erodibility. The erosion control cost estimate for this site is $1305. (2) I r_ I I I FINAL DRAINAGE AND EROSION CONTROL REPORT FOR LOT 1 AND 2, GARTH COMMERCIAL PLAZA EXISTING SITE The proposed site is Lots 1 and 2, Garth Commercial Plaza located in the Northeast'/< of Section 35, Township 7 North, Range 69 West of the Sixth P.M., Fort Collins, Larimer County, Colorado. The gross site area including the West one-half of South Mason Street is 1.35 acres. This project is in the City of Fort Collins "McClellands/Mail Creek Drainage Basin". The site is bounded on the East by South Mason Street which is constructed; on the South by Lot 3 of this Subdivision (Lot 3 is not developed); on the West by the Burlington/Northern Railroad; and on the North by an undeveloped site. The North site is a low area and will need to be filled prior to development. There is no offsite runoff from the North or East onto this site. Lot 3 and part of the railroad property (to the tracts) drains across this site. This sites runoff is Northeast at about 1% slope. There is and existing 30 inch storm drain system in Boardwalk Drive and South Mason Street North of this site. The outlet for this system is Mail Creek. The allowable discharge has been previously established at 0.5 c.fs. per acre by the McClellands/Mail Creek Master Plan. DESIGN CRITERIA: The rational method will be used to determine the developed site initial and major storm runoff Detention for the site will be based on the 100-year storm less the allowed release rate of 0.5 c.£s. per acre. The mass diagram will be used to determine the required detention. All calculations and design consideration are in accordance with the City of Fort Collins Design Citeria Manual, except the historic 2-year storm will not be used for the release rate. DEVELOPED SITE: A Ramada Limited Suites is proposed on this site. It will be a 66 unit three story building with parking, access drives and landscaping. A shared driveway with Lot 3 on the South side of this site will also be constructed with this project. South Mason Street is constructed and flows north to an existing inlet about 200 feet North of this site. This project will be divided into Four Subbasins. Each basin will have a detention area. Runoff along South Mason Street South of our project will be routed through this projects system in exchange for the runoff along South Mason Street East of our site that flows North and will be undetained. (1) VICINITY MAP SCALE-/II=/000I ROAv % N IC IYr STEWART$,LSSOCWES Consulting Engineers and Surveyors May 20, 1996 Mr. Glen Schlueter Storm Water Utility City of Fort Collins P.O. Box 580 Fort Collins, CO 80522 Dear Glen, Lots I and 2 of the Garth Commercial Plaza are to be constructed for a three story Ramada Limited Suites with parking, access roads and landscaping. This site is in the City's "McClellands/Mail Creek Drainage Basin". All design and calculations within this report are in compliance with the City of Fort Collins Storm Drainage Design Criteria and Construction Standards. If you have any questions regarding the attached report and calculations, please let me know. James H. Stewart and Associates, Inc. 103 S. Meldrum Street P.O. Box 429 Ft. Collins, CO 80522 970/482-9331 Fax 970/482-9382 r 1 FINAL DRAINAGE AND EROSION CONTROL REPORT FOR LOT 1 AND 2, GARTH COMMERCIAL PLAZA LOCATED IN THE MCCLELLANDS/MAIL CREEK DRAINAGE BASINS ' PREPARED FOR ' GEORGE HOLTER ' May 20,1996 I PREPARED BY STEWART & ASSOCIATES, INC. I 103 SOUTH MELDRUM STREET FORT COLLINS, COLORADO 80521 I 970/482-9331