HomeMy WebLinkAboutSigned Waiver RequestIndianapolis, IN | St. Louis, MO | .www.weihe.net | (317) 846-6611 | (800) 452-6408
March 10, 2021
Mr. Jeremy Kashman, P.E. City Engineer’s Office City of Carmel One Civic Square Carmel IN 46032
RE: 1800 106th Street Subdivision, Lot 1
Request for Approval of Design Standard Waiver
Mr. Kashman, on behalf of Central IN Properties, LLC, the owner of Lot 1 in the 1800 106th Street Subdivision,
I am requesting a waiver of Section 104.02 of the City of Carmel’s Stormwater Technical Standards Manual for Lot 1.
Section 104.02 of the Technical Standards Manual states in part, that “a building’s lowest entry elevation that is adjacent to and facing a road shall be a minimum of 15 inches above the road elevation.”
As the attached grading plan for Lot 1 shows:
•There is a high point in 106th Street in front of this lot. The street elevation is 871.0.
•The existing grade of Lot 1 slopes from the SE corner of the lot toward the NW. The elevation at theSE corner is approximately 869.0 and falls to an elevation of approximately 861.5 at the flood zone
behind the proposed house.
•To attain a finished floor elevation (FFE) that is 15 inches about the street would require the FFE to beat an elevation of 872.25. Since the FFE will be 8 inches above the building pad elevation, the pad willneed to be constructed at elevation 871.58.
•To construct the building pad to this elevation will require the existing grade to be raised approximately2.5 ft. at the SE corner of the pad and increasing to approximately 4.5 ft. at the NW corner of the pad.
•The cost of placing this much fill material on the site is prohibitive and would also result in steep slopes
in the rear yard that would require the construction of an extensive retaining wall to avoid filling in theflood zone behind the house.
To ensure positive drainage between the street and the house, I am proposing to:
•Set the FFE of the house at 869.0 with a pad elevation of 868.33.
•Place a swale between the street and the house with a high point in front of the house. The swale willdrain to the east and the west from the high point with the surface flow being picked up in yard inlets.
The storm sewer pipe that will carry the flow from the inlets will also be used to connect the roofdownspouts and serve as an underdrain. This pipe will outlet into an underground detention systemthat will be constructed under the driveway.
•This plan will provide adequate drainage for Lot 1 and will provide for positive drainage from theright-of-way of 106th Street.
Mr. Kashman, please consider this request and let me know if you need any other information.
Sincerely,
Duane A. Sharrer, P.E. Vice President, Residential Development