20201685 Ver 1_RE NCWRC Comments_20210511

Strickland, Bev
From: Tinklenberg, Chris <[e-mail]>
Sent: Wednesday, May 5, 2021 11:07 AM
To: Munzer, Olivia
Cc: Johnson, Alan; Roden Reynolds, Bryan K CIV (USA);
[e-mail]; Day, Blake
Subject: RE: NCWRC Comments - Savona Mill Renovations
Hi Olivia,
Thank you for your review and comments. Many of your concerns have been identified previously and have been or are
in process of being addressed. Here are some of the activities proposed to improve the overall environment and
hydrologic/hydraulic conditions on the proposed site:
• A 110-space, 2-story parking structure is proposed immediately adjacent to the mill. Taller parking structures are
not allowed per Historic Preservation to maintain the integrity of the historical viewshed of the mill;
• As part of the multi -family rezoning petition, we have proposed a reduction in the required 1:1 parking (spaces
per unit) to 0.6:1 which intends to further minimize grading and disturbance within the floodplain and buffer of
Stewart Creek;
• All existing pavement currently within the floodplain and/or 100-ft buffer of Stewart Creek and all disturbances
within the 100-ft buffer area will be planted with native vegetation per for the Charlotte -Mecklenburg buffer
mitigation guidelines (see image below);
• Additional native tree plantings will be planted within the buffer and throughout the site to meet the tree
ordinance and density requirements;
• A hydrologic and hydraulic analysis has been conducted for all work and development within the FEMA flood
zone and resulted in the following:
o The criteria for a no -rise certification state that there shall be no more than a 0.00' foot rise within the
100- year BFE in the existing conditions watershed. When compared to the corrective effective model the
proposed model does not result in an increase in the 100-year BFE. A Conditional Letter of Map Revision
and Letter of Map Revision are not required since there is no increase in the 100-year BFE and no
changes to the floodway encroachment widths. Based on the City of Charlotte Floodplain Ordinance,
dated July 27, 2015, section 9-102 (f), 2.a. the analysis shows there is not an increase greater than 0.10'
during the occurrence of the Community Base Flood. A floodplain development permit and No-Rise/No-
Impact certification will be submitted to satisfy the Mecklenburg County permitting requirements for a
floodplain development permit.
• The stream impact associated with the multi -family development in the northeastern portion of the site is
unavoidable and necessary to meet the overall goals of the project. As required for impacts within the Lower
Catawba Expanded Service Area, the developer is prepared to pay double the required compensatory mitigation
for the impact to this feature;
• To your point, the existing storm drainage network which conveys drainage from the northeastern stream,
through the site, to Stewart Creek, is undersized based on today's frequency and intensity of flooding events
which has resulted in several sink -holes on the site. The proposed storm drainage network conveying will be
oversized (42-inch RCP) to appropriately convey existing and future storm events to help mitigate flooding
potential during large storm events. Additionally, drainage improvements along South Turner Avenue and
Chamberlain Avenue are also proposed to help capture and convey storm drainage.
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I hope this helps address your concerns and recommendations. If you have any other questions or need anything else,
please let me know
Thank,
Chris
Chris Tinklenberg, PWS
Kimley-Horn 1200 South Tryon Street, Suite 200, Charlotte, NC 28202
Direct: 704 409 1802 I Mobile: [phone]
From: Munzer, Olivia <[e-mail]>
Sent: Wednesday, May 5, 2021 7:52 AM
To: Tinklenberg, Chris <[e-mail]>
Cc: Johnson, Alan <[e-mail]>; Roden Reynolds, Bryan K CIV (USA)
<[e-mail]>; [e-mail]
Subject: NCWRC Comments - Savona Mill Renovations
Good morning Chris,
I have no species concerns and renovating the site is a great idea. However, I have concerns with the impacts to streams,
especially since mitigation will be in the Extended Service Area. I also am very concerned with any impacts within the
floodplain. I highly recommend parking structures to reduce impacts to the site.
Recently we went out to a site that had a small stream within a residential area in Charlotte, which was not within a
flood zone. Because of the increase in frequency and intensity of flooding and the sediment load, the parking lot
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(vehicles) and adjacent houses kept getting flooded. It has caused a lot of problems for the residents. Similar incidences
has happened in Charlotte. I do not recommend any impacts within the flood zone due to the potential of flooding.
I also recommend planting native vegetation. Avoid using invasive, non-native plants in seed mixtures or landscaping
plants (http://www.ncwildflower.org/plant_galleries/invasives_list).
Use non-invasive native species and Low Impact Development (LID) technology in landscaping. Using LID technology in
landscaping will not only help maintain the predevelopment hydrologic regime, but also enhance the aesthetic and
habitat value of the site. LID techniques include permeable pavement and bioretention areas that can collect
stormwater from driveways and parking areas. Additional alternatives include narrower roads, swales versus
curbs/gutters and permeable surfaces such as turf stone, brick, and cobblestone. Compared to conventional
developments, implementing appropriate LID techniques can be more cost-effective, increase property values, provide
space -saving advantages, reduce runoff, and protect water quality (https://owl.cwp.org/mdocs-posts/roseen-et-a1-2011-
forging-the-link/). Also, additional information on LID can be found at the NC State University LID guide:
http://www.onsiteconsortium.org/npsdeal/NC LID Guidebook.pdf. NCWRC's Green Growth Toolbox provides
information on nature -friendly planning (http://www.ncwildlife.org/Conserving/Programs/GreenGrowthToolbox.aspx).
Please let me know if you have any questions. Thank you,
Olivia
Olivia Munzer
Western Piedmont Habitat Conservation Coordinator
NC Wildlife Resources Commission
Rogers Depot
1718 NC Hwy 56 W
Creedmoor, NC 27522
Office: 919-707-0364
Cell: 336-269-0074
[e-mail]
www.ncwildlife.org
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