HomeMy WebLinkAboutReview ltr - Hamilton CountyDecember 8, 2009
Stair Associates, Inc.
ATTN: Ramon Stair
9810 Greentree Drive
Carmel, IN. 46032
VIA E -MAIL: randy@stairnet.biz
Dear Mr. Stair:
Xenton C. «Ward, CT.31
Surveyor of i (amilton County
("Phone (317) 77
`Fax (3 776 -9628
RE: Stair Associates Rezone /ADLS
2. The proposed project DOES NOT fall in a Carmel Well Head Protection Zone.
3. The proposed project does fall in the Crooked Creek Regulated Drain Watershed.
4. Hamilton County Surveyor's Office has no objections to the Rezone request.
1. This proposed project falls within the unincorporated limits and MS4 jurisdiction of
Hamilton County.
Suite 188
One .7 (amilton County Square
Noblesville, Indiana 46060 -2230
We have reviewed the submittal from Howard Associates to the Hamilton County Surveyor's
Office on December 1, 2009 for this project and have the following comments:
5. The letter and map you provided dated November 24, 2009 do describe a decrease of 3357
sq. feet of impervious area that drains to Crooked Creek Regulated Drain upstream of 96
Street and a net increase of 2896 sq. feet of impervious area to the Crooked Creek Watershed
downstream of 96 Street. While that is justification for not providing detention for the
drainage to the Crooked Creek Regulated Drain, it is not beneficial to the overall drainage
shed because of the limited capacity of the existing culvert under I -465.
6. While the designed drainage system is private infrastructure on private property, HCSO has
concerns that 13,674 sq. feet of impervious area will not adequately drain through two 6"
PVC pipes.
7. The Crooked Creek Regulated Drain east of the proposed building location does not have a
determined Base Flood Elevation per FIRM Panel 18057CO215F. A 100 year elevation of
868.63 was determined by The Corradino Group for the upstream elevation of the new 96
Street box culvert being installed with the road project. It is recommended that this be
investigated to determine if the structure in the new location will be reasonably protected
from localized flooding during the 1% Chance (100 year) Flood Event.
8. Proper data has not been provided to determine the applicability of the federally mandated
Clean Water Act Phase II. If you have any questions regarding that, please contact Robert
Thompson, Hamilton County Program Manager.
Should you have any questions, I can be reached at 317 776 -8495.
Sincerely,
alo
Greg Hoyes, AC, CFM, CPESC
Plan Reviewer
CC: Christine Barton- Holmes Carmel DOCS
John Thomas Carmel Engineering
Dick Hill Carmel Engineering
Greg Ilko Crossroads Engineers
Tim Knapp H.C. Highway Depaituient
Bob Thompson HCSO
Mike Howard Howard Associates