SW3220201_Email_20220405

Georgoulias, Bethany
From: Farkas, Jim J
Sent: Tuesday, April 5, 2022 3:22 PM
To: Blackmon, Matthew
Cc: Ashbaugh, Jeff
Subject: RE: [External] RE: SW3220201; Frank Liske Park Barn
Thank you, this was insightful. Would you like to set up a Teams meeting to go over this project sometime on Thursday
(4/7/22)? 1 think that we can work it out and get this project to be low -density.
-Jim
From: Blackmon, Matthew <[e-mail]>
Sent: Tuesday, April 5, 2022 3:02 PM
To: Farkas, Jim J <[e-mail]>
Cc: Ashbaugh, Jeff <[e-mail]>
Subject: [External] RE: SW3220201; Frank Liske Park Barn
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Hi Jim,
Thanks for the feedback. I believe the existing barn did have a collector drain that all the roof drains tied into
but I'm not sure it had area drains. I will have to research it some. The issue may be the survey. When the old
barn burned down, they demo'ed the structure for safety reasons, but let me get with the park department to
see if there are any record drawings for the drain system.
As for grading the site to avoid the flow from the north side, there are several trees that are very old on that
part of the property, and we were trying to avoid losing them. Because of that, the water sheet flows almost
directly toward the front door, which is obviously a problem, and hence the area drains. We thought since we
needed the area drains anyway, it made sense to use the same outfall. If daylighting the roof drains on the
west side make the area drains more palatable, we can certainly do that.
Attached is the drainage area map we used to calculate things. Please let me know if you have any questions,
or if a call would be helpful.
Thanks again for your feedback,
Matthew Blackmon, PE
Project Engineer
mblackmon(a)benesch.com
direct:704-831-5686 mobile:[phone] office:704-521-9880

From: Farkas, Jim J <[e-mail]>
Sent: Tuesday, April 5, 2022 2:35 PM
To: Blackmon, Matthew <[e-mail]>
Subject: SW3220201; Frank Liske Park Barn
Please upload the electronic files for this project using the following link: https://edocs.deg.nc.gov/Forms/SW-
Supplemental-Upload [edocs.deg.nc.govl (Looks like I forgot to send the email requesting that you do this when we
accepted the project on 2/7/22).
Some questions that you may be able to answer to help with my review:
Pipe network on the north side of the barn:
1) Was there an existing pipe network in this area that served a similar function? If there was, it should be shown
on the existing site plan and we could then allow this proposed network since it would be replacing an existing
system (i.e., equal or better treatment).
2) If the proposed pipe network is brand new, why couldn't this plaza area be graded like the existing plaza area
(having the plaza area sheet flow into the grassy areas to the north of the barn)? I understand that enclosed
pervious areas (inlet AI-1 and the 6" subdrain) do need some sort of pipe to allow the runoff "out", but inlets AI-
2, 3, & 5 seem like they could be removed even if the site area is relatively flat. You could extend your limits of
grading north and add an east -west ditch just north of the plaza so that the small hill north of the plaza doesn't
drain onto the plaza (and the plaza can drain to this ditch).
3) If you have it handy, could you send me a drainage area delineation for the inlets to the piping network (This
isn't a required item, it will just help me with my review)?
Roof drains:
1) Why can't the roof drains sheet flow across the pavement and into the grassy areas next to the barn or be
released into a nearby grassy area like a Disconnected Impervious Surface (similar to how the southeastern roof
drains are)? Collecting the roof drains and piping them to a central location doesn't really meet the definition of
"low -density" (15A NCAC 02H .1003(2)(b)).
2) If the existing site piped the roof drains similar to how is shown in the proposed plans, we can then allow this
since it would be replacing an existing system (i.e., equal or better treatment) provided it is shown on the
existing site plan.
-Jim
From: Blackmon, Matthew <[e-mail]>
Sent: Thursday, March 31, 2022 8:55 AM
To: Farkas, Jim J <[e-mail]>
Subject: [External] Frank Liske Park Check In
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Hi Jim,
I just wanted to check in on the status of Frank Liske Park Barn, to see if you needed anything additional.
Please let me know.
Thanks,
Matthew Blackmon, PE
Project Engineer

mblackmonAbenesch.com
direct:704-831-5686 mobile:[phone] office:704-521-9880
2359 Perimeter Pointe Parkway, Suite 350, Charlotte, NC 28208
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