20140770 Ver 1_More Info Requested_20150602

Fox, Tim
From:
Devane, Boyd
Sent:
Tuesday, June 02, 2015 5:15 PM
To:
Wanda Austin
Cc:
bradleycycle @yahoo.com; Davidson, Landon; Higgins, Karen; Fox, Tim; Price, Zan
(George)
Subject:
Request for additional information - Beaverdam Road. #14 -0770
Thank you for providing the updated plans that we received on April 26, 2015. They are much
improved and, hopefully, when the minor corrections and clarifications noted below are addressed,
we will be able to expeditiously approve the project. Also, your drainage area delineations on the
electronic version that we received on 5 -11 -15 are much better. Thanks for making the changes.
1. There is obviously some misunderstanding about including the entire 28 acres in the request
for approval. You indicated in your April 21, 2015 letter that I had advised you to include the
entire property area in the impervious calculations. I hope I didn't give that advice because that
seems to me to be the opposite of what would be best for your client. If you included the entire
area of land ownership in the submittal as one low- density project, the entire 28 acres would
be tied to the 8% impervious approval and would make it more cumbersome to go to high
density at a later time. I suggest that you reconsider that proposal.
2. There are some discrepancies in the impervious and total project area calculations that need
to be corrected. On your most - recent " Stormwater 2" drawing, the "Impervious Area" table
shows 95,927 sf of impervious area which equates to 2.25 acres. However, the "Drainage Area
Calculations' table on that same page provides impervious numbers for the six drainage areas
that total 1.53 acres. Similarly, the "Total Area" from the "Impervious Area' table shows
1,166,536.8 sf which equals 26.8 acres. However, the "Drainage Area Calculations" table, on
that same page, provides numbers that total 28 acres. Please address the inconsistencies.
3. From the "Impervious Area' table, we could not identify which streets were "future" and which
were "on -site streets." What drainage area is the "future street" located? Is it drainage area #6?
Is it in Phase I or Phase II? Perhaps it is indicated on the drawing but I didn't see it. Please
indicate where the "future street" area is located, explain how it differs from the "On -site
streets," and clarify if you are asking for approval of the "future street" area at this time.
4. Although we asked for further explanation on the issue of how the stormwater flows will meet
the "transported by vegetated conveyances" provision, we still don't understand if that
condition is met or why the three swales were designed as you proposed. However, since
most of the stormwater does filter across them, we are going to accept them as providing the
equivalent treatment as the "transported by vegetated conveyances" requirement.
5. As for the Low Density supplement sheet, I agree that it is not easy to understand. It was
prepared for residential development and doesn't work easily for commercial. I would
recommend that you not use the "calculation" on that sheet but just use the total project
acreage and the total impervious area that is planned for development in this first phase. Get
the total of parking, buildings, sidewalks and streets and consider that number the impervious

area. Take that sum and divide it by the total project area of this first phase of development. If
the result is under 25 %, then the project can qualify as low density.
6. Please make the corrections and any modifications that you think appropriate and return to
Karen Higgins at our 401 and Buffer Permitting Unit, 1617 Mail Service Center, Raleigh, NC
27699 -1617. Please submit three copies of the final plans on the large sheets (approximately
2'X3') along with one electronic version.
7. In order to continue the review in a timely manner, please provide this information within 30
days of receipt of this letter. Your project review will be placed on hold until we receive this
additional information.
Please call or email me if you have questions about any of the issues above.