HomeMy WebLinkAbout106th Street Email1
Jordan, Alex
From:Duane Sharrer <sharrerd@weihe.net>
Sent:Friday, December 4, 2020 2:25 PM
To:Thomas, John G; Jordan, Alex
Cc:Travis Gaither; James Miles; Steve Clark
Subject:2080 W 106th Street - Summary of Teams Meeting
Attachments:Plot Plan-20201203.pdf; Plot Plan Grading-20201203.pdf
Follow Up Flag:Follow up
Flag Status:Completed
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John and Alex, thank you for meeting (virtually) with Travis and I yesterday to discuss Lot 1 of the 1800 106th
St. Subdivision. This email is intended to capture the main points of our discussion:
The attached preliminary plot plan and grading information were shared.
The following points were discussed:
• The subdivision plans for the 1800 106th St. Subdivision project prepared by Banning Engineers shows a
proposed dry basin and infiltration trench on each of the two lots in the subdivision. A house has been
built on Lot 2 and the dry basin for that lot has been constructed. Lot 1 is more restricted by flood plain,
easements and elevation changes than Lot 2 and as a result, the proposed house cannot be pushed to the
west as far as necessary to allow the house and driveway to function as the owner intends, resulting in
the need to utilize the space where the dry basin was originally proposed. We are proposing an
underground detention basin under the driveway in place of the dry basin. We are in preliminary design
right now, but it appears that we will be utilizing ADS Stormtech SC 740 detention chambers, or
equivalent, with 3 or 4 rows of chambers. As we discussed, we will design one of the rows of chambers
as an “isolator row” which will have a filter fabric wrap and an access hatch to allow the chamber to be
cleaned out. We are proposing two inlets in the driveway to collect some of the storm water runoff. As
part of our water quality measures, the inlets will be designed with 2-ft. sumps to collect any sediment or
debris that may get flushed into the inlets.
• A BMP O&M manual will be prepared for the underground detention system and the sumped inlets.
• The roof drainage from the house will be collected via SSD which will outlet to the inlets in the
driveway.
• There is an existing easement that was platted to encompass the proposed dry basin and a 15 ft.
Drainage Easement that was platted along the eastern property line to provide for access to the dry basin
if the City ever needed to perform maintenance. Since the driveway will be west of the 15 ft. easement
and the proposed underground detention system may not align with the existing easement, we will
provide whatever additional easements will be necessary to encompass the underground system and the
driveway. As we discussed, the existing easements can remain in place and will not restrict the use of
the property.
• The topography of the lot is such that the elevation of the house is below the elevation of 106th
St. There is a high point in the street directly in front of the house. A City design standard calls for the
finished floor elevation (FFE) of a house to be a minimum of 1 ft. above the street so that positive
drainage is maintained. As the attached grading plan shows, raising the house so the FFE is 1 ft. above
the street will require a significant amount of fill to be brought in and will require a substantial retaining
2
wall in the rear yard to allow for the grade to transition. To avoid this, we are proposing to set the FFE
of the house below the elevation of the high point of 106th St. and direct the storm water runoff from the
front of the house to the side yards by constructing a shallow swale. Everyone agreed this is a viable
plan. We will need to request a waiver of the design standard at the time we file the plot plan for a
building permit.
These points were agreed to in our conversation. If there is any discrepancy with this information or there is a
need to clarify what was discussed, please respond appropriately.
Thank you.
Duane A. Sharrer, P.E.
Vice President, Residential Development
Weihe Engineers, Inc.
10505 N. College Avenue
Indianapolis, Indiana 46280
317-846–6611 office
800-452-6408 toll-free
317-690-1540 cell
sharrerd@weihe.net email
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