SW5220101_Response To Comments_20220408

�� MCADAMS
April 08, 2022
North Carolina Department of Environmental Quality
Division of Energy, Mineral and Land Resources
512 N. Salisbury Street
1612 Mail Service Center
Raleigh, North Carolina 27699
RE: Hardee's — Main Street
Case Number: SW5220101
Response to NCDEQ Comments
2021110321
RESPONSE TO COMMENTS > 2021110321
The following are the response comments for the above -mentioned project. Our response comments are in bold.
STORMWATER
Jim Farkas
1. Please QA/QC the submission items prior to resubmitting the requested information for this project. There
were numerous inconsistencies in the submission materials noted during the review and it was difficult to
ascertain which values were the "correct" values. This review was performed to the best of our abilities given
the provided information.
McAdams Response: Noted and reviewed for consistency.
2. The parcel areas shown on plan sheet C2.00 (1.72 ac for parcel 1 and 0.66 ac for parcel 2) do not add up to the
property area as shown in Section IV, 4 of the Application (2.07 ac) or other sheets of the plan set (cover page,
C1.00, etc...). Please revise as needed.
McAdams Response: Noted, plan set sheets have been revised to all match for a total of 2.07 ac
(parcel 1 =1.41 ac and parcel 2 = 0.66 ac). Note that the property boundaries and areas differ between
the plans and the ALTA survey because the property went through a recombination. The plans show the
current, updated lot configuration.
3. The provided purchase agreement lists Tommy E. Twitty as the seller of parcel 1 whereas the provided
property deed shows Mr. & Mrs. Floyd as the Property Owners. Please clarify who owns the property and
revise the Application and/or Purchase Agreement as needed.
McAdams Response: The property was in the process of being sold when we submitted. An updated
deed is attached with this resubmittal. An updated application is included as well.
creating experiences through experience 2905 Meridian Parkway, Durham, NC 27713 / 919. 361. 5000

�� MCADAMS RESPONSE TO COMMENTS > 2021110321
4. As noted in the administrative completeness review, the deed restrictions and protective covenants have not
yet been provided for this project. Please provide these documents as they are required prior to issuing the
permit.
McAdams Response: There are no protective covenants with the property. It was purchased by the
developer (deed included in resubmittal) and they do not have any covenants that they will apply to the
property.
5. Adding up the BUA types shown in Section IV, 10 of the Application and the Drainage Area Page of the
Supplement-EZ Form results in a total BUA within the drainage area of 61,958 sf (61,956 sf is shown as the
total BUA). This might be a rounding error but should be corrected.
McAdams Response: The total BUA and the sum of the BUA subsections are updated to be equal. The
total BUA is 61,956 SF.
6. There appears to be an issue with the temporary pool of the stormwater wetland. Please revise as needed:
> The temporary pool is shown at elevation 272.87 in the Supplement-EZ Form. This results in a temporary
storage volume of only 4,069 cf (a minimum design volume of 4,967 cf is required for this drainage area) and
the provided forebay area (889 sf per the Supplement-EZ Form) is more than the allowable 15%
(Stormwater Wetland MDC 6) of the wetland surface area (5,740 sf per the Supplement-EZ Form) [889 sf /
5,740 sf = 15.5%].
McAdams Response: The stormwater wetland dimensions and layout are updated. The temporary
storage area (5,831 cf) is greater than the minimum design volume (4,967 cf). The forebay is 631 sf (11.0%
of the total wetland surface).
> The temporary pool is at elevation 273.5 on plan sheet C9.02, as indicated by the riser elevation. This results in
a temporary pool ponding depth in excess of 15 inches (Stormwater Wetland MDC 1). The plans show the
permanent pool at elevation 272.0, but also show the drawdown orifice invert at elevation 271.5 so it is
unclear from the plans where the permanent pool surface elevation would be at, but either of these
elevations result in a temporary pool ponding depth in excess of 15 inches.
McAdams Response: The temporary pool elevation is reduced to 273.25'. The max ponding depth is 15".
> The temporary pool is shown at elevation 273.25 per the calculations. This results in a temporary storage
volume of 5,954 cf.
McAdams Response: The temporary storage volume is now 5,831 cf at the temporary pool elevation of
273.25'. The Supplement-EZ Form has been revised to reflect this value.
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7. As previously mentioned, plan sheet C9.02 shows the drawdown orifice invert at elevation 271.5 which
contradicts the shown permanent pool elevation of 272.0. Please revise.
McAdams Response: Please see the "INVERTED INTAKE DETAIL (RISER)" on sheet C9.03 (image of the
detail provided below). The normal pool elevation is set by the top of the turn up of the 4" diameter PVC
inside the riser (highlighted below). The turn up will be adjusted in the field to reach the normal pool
elevation of 272'. The 4" PVC invert elevation into the riser at 271.5' will not control the normal pool
elevation as a 4" cap will be installed on the PVC at 271.5' as shown in the construction drawings.
PERMANENT
CUTLET
STRUCTURE °
y` e.
it
SAW OFF 4"0 PVC (SCH 40) -
•a
4"0 PVC (SCH 40)
TO ADJUSTED NORMAL POOL y`
FOLLOWING AS —BUILT
SURVEY EVALUATION BY
DESIGN ENGINEER. DESIGN
NORMAL POOL = 272, 00
3"
4" PVC CAP
WITH SCREW
TYPE PLUG
4" PVC CAP M z
TOP FI . = 777.33
WITH SCREW
CONTROL EL — 272.DD
TYPE PLUG
4" 4 PVC INVERT EL. = 271,50
4" PVC CAP WITH
1"0 DRILLED
CONTRACTOR TO PRCVIDE .e
- -
ORIFICE
WATERTIGHT CONNECTION -
-
BETWEEN INVERTED INTAKE
° v
AND RISER
5.
n CONCRETE ANTI —FLOATATION
—
BLOCK
INVERTED
INTAKE DETAIL (RISER)
N r-s-
8. As designed, the stormwater wetland appears to short-circuit (Stormwater Wetland MDC 5). Incoming
stormwater runoff enters the stormwater wetland at its midpoint and does not utilize the entire provided
stormwater wetland. Please revise (you may wish to direct the stormwater runoff to the southwestern most
deep pool, this would allow the stormwater runoff to utilize the entire length of the stormwater wetland).
McAdams Response: The stormwater inlet and forebay locations have been updated to avoid short-
circuiting the flow path within the SCM.
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9. Per Stormwater Wetland MDC 6, the forebay area may not exceed 15% (and must be at least 10%) of the
wetland surface area. Per the provided information in the Supplement-EZ Form and calculations, the forebay
is about 15.5% of the wetland surface area. Please revise.
McAdams Response: The forebay area is revised to be 11.0% of the total wetland surface.
10. Per Stormwater Wetland MDC 6, the entrance of the forebay must be deeper than the forebay exit. The
information provided in the plan sheets and the Supplement-EZ Form does not indicate that this design
requirement has been met. Please revise.
McAdams Response: The forebay grading is updated so that the entrance (289.9') is lower than the exit
(290.0').
11. Per Stormwater Wetland MDC 8, the shallow water zone comprises the portions of the stormwater wetland
that are between zero and nine inches below the permanent pool. The provided information only shows the
shallow water zone as being six inches deep. Per plan sheet C9.04, the shallow water zone is shown as having
a top elevation of 272.0 (the permanent pool elevation) and a bottom elevation of 271.5 (at which point, the
deep pool zone starts). The deep pool zones should only include the portions of the stormwater wetland that
are at or below elevation 271.25. Please revise.
McAdams Response: The deep pool zones are revised to be areas >=9 in. depth at normal pool, and the
shallow water zones are revised to be areas 0-9 in. depth at normal pool.
12. Plan sheet C9.04 indicates that there are an insufficient number of plants planted in the shallow water zone
(Stormwater Wetland MDC 13). The information on this plans sheet indicates that the shallow water zone is
2,594 sf (which contradicts the information shown in the Supplement-EZ Form and calculations, 2,230 sf) and
has a total of 563 plants (145 + 192 + 226) this results in only 43.4 plants per 200 sf (adding up the provided
areas for each plant in this zone adds up to 2,249 sf which is different than what is shown elsewhere). Please
revise.
McAdams Response: The shallow water and shallow land areas on sheet C9.04 are revised to be correct.
The planting quantity is revised to be 50 plants per 200 square feet.
13. Adding up the provided planting areas for each of the plants in the temporary inundation zone (plan sheet
C9.04) results in a total surface area of 2,052 sf which is different than the total temporary inundation zone
surface area shown (1,763 sf) which is also different than the information shown in the Supplement-EZ Form
and calculations, 2,066 sf. Please revise.
McAdams Response: The planting zone areas in the Supplement-EZ Form and on sheet C9.04 have been
updated to be correct and matching.
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14. Please clearly show in the main set of plans how the stormwater maintenance access/easement connects to
the public right-of-way (General MDC 8c & 9). It is noted that the stormwater maintenance access/easement is
shown on the plans, but it is unclear how it connects to the public right-of-way.
McAdams Response: The stormwater maintenance/access easement is revised on sheet C9.01 to clearly
show the boundaries and connect to the public R/W.
15. The following issues were noted in the Supplement-EZ Form, Stormwater Wetland Page:
> Line 1—The drainage area number refers to the number that the drainage area is assigned on the Drainage
Area Page of the Supplement-EZ Form, not the area of the drainage area in acres. Please revise.
McAdams Response: The drainage area number is corrected on the Supplement-EZ Form. Drainage area
1 is correct.
> Line 20 — Please answer this item.
McAdams Response: Line 20 is completed. No berms or baffles are provided for the stormwater wetland.
> Line 25 —As mentioned previously, a temporary pool surface elevation of 272.87 results in a temporary
storage volume of only 4,069 cf per the stage storage table which is insufficient for this drainage area. Revise
as needed.
McAdams Response: The temporary pool elevation is revised to be 273.25'.
> Line 26 —As mentioned previously, there is a discrepancy in the plans with regard to the actual permanent
pool elevation (permanent pool value shown vs. drawdown orifice invert). Revise as needed.
McAdams Response: The normal pool elevation for the designed wetland is 272.0'. See comment
response 7 for further detail.
> Line 27 —As mentioned previously, the bottom of the shallow water zone must be nine inches below the
permanent pool elevation (per Stormwater Wetland MDC 8). Revise as needed.
McAdams Response: Wetland MDC 8 states that "[s]hallow water includes all areas inundated by the
permanent pool to a depth of zero to nine inches". The proposed shallow water zone is mainly 6" below
normal pool elevation, and comprises the total wetlands area for a depth of 0-9" ponding depth below
normal pool.
> Lines 28, 29, 43, & 44—As mentioned previously, the forebay entrance must be deeper (at a lower elevation)
than the forebay exit. Revise as needed.
McAdams Response: The forebay entrance elevation (line 28) is revised to be 298.9' to be deeper than
the forebay exit (line 29, 269.0').
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> Line 32 —As previously mentioned, the calculations list the temporary inundation zone area as 2,066 sf and
plan sheet C9.04 lists this area as 1,763 sf. Revise as needed.
McAdams Response: Planting zone areas are updated in the Supplement-EZ Form and sheet C9.04 of the
construction drawings to be correct and match one another.
> Line 33 —As previously mentioned, the calculations list the shallow water zone area as 2,230 sf and plan sheet
C9.04 lists this area as 2,594 sf. Please ensure that the entire shallow water zone (all portions of the wetland
that are between zero and nine inches below the permanent pool) is included in this area. Revise as needed.
McAdams Response: Planting zone areas are updated in the Supplement-EZ Form and sheet C9.04 of the
construction drawings to be correct and match one another.
> Lines 34 & 35 —As previously mentioned, please ensure that the shallow water zone is not included in these
areas.
McAdams Response: Shallow water zone areas are not included in the deep pool area calculations.
> Lines 31-39 — These items may need to be re -calculated in order to address the above comments.
McAdams Response: Planting zone areas are updated in the Supplement-EZ Form and sheet C9.04 of the
construction drawings to be correct and match one another.
> Line 38 —As previously mentioned, the provided forebay area (889 sf) is larger than 15% of the total surface
area of the wetland (5,740 sf). Revise as needed.
McAdams Response: The forebay area is revised to be 11.0% of the total wetland surface.
> Lines 40 & 41—These values will change based on the revised value of Line 25.
McAdams Response: Lines 40 & 41 are updated to match the revised wetland design.
> Line 42 —This value should not exceed 9 in per Stormwater Wetland MDC 8.
McAdams Response: The shallow water zone depth is revised to be less than 9".
> Line 53 — Please answer this item.
McAdams Response: 50 plants are proposed per 200 square feet in the shallow water zone. This question
is answered in line 57 of the Supplement-EZ Form due to an error with the spreadsheet input.
16. Please ensure that all of the files from the initial submission are electronically uploaded. It appears as though
only the items that were requested in my 12/28/21 administrative completeness review email were uploaded.
Items (such as the Supplement-EZ Form, O&M Agreement Form, calculations, etc...) from the initial 12/21/21
submission were not uploaded and are required to be.
McAdams Response: Noted. Additional items are included in this resubmittal.
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17. Provide pdfs of all revisions, 2 hardcopies of revised plan sheets, 1 hardcopy of other documents, and a
response to comments letter briefly describing how the comments have been addressed.
> Pdfs must be uploaded using the form at: https://edocs.deg.nc.gov/Forms/SW-Supplemental-Upload
> Hard copies must be mailed or delivered to the following address:
For Fed Ex/UPS:
Jim Farkas
512 N. Salisbury Street
Office 640E Raleigh, NC 27604
> For USPS:
Jim Farkas
1612 Mail Service Center
Raleigh, NC 27699-1612
> Hand Delivery:
Please reach out to me prior to hand delivering a submission to make sure that I (or someone else in my
group) will be able to receive the submission. Do not leave the package in the foyer with the security guard.
McAdams Response: Noted.
18. While not required, the following items were noted during the review:
> The minimum recommended drainage area size for a stormwater wetland is 2 acres. This helps ensure that the
wetland remains wet throughout the year and that the plants remain alive and healthy. You may wish to select
acceptable plants that are drought tolerant, or select a more appropriate SCM for the site.
McAdams Response: Noted. Shallow Land species have been revised on Sheet C9.04.
> An emergency spillway for the SCM is recommended. It is noted that the SCM is designed to handle the 100-
year design storm however, in the event of a clog in the outlet structure or extreme weather event, an
emergency spillway can prevent an embankment failure.
McAdams Response: Noted.
> You may wish to add a stage -storage table for the portions of the stormwater wetland that are located below
the permanent pool. This can help with verifying that the MDCs relating to the zone sizing (Stormwater
Wetland MDCs 6-9) have been met.
McAdams Response: Noted.
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Consideration of this response is greatly appreciated. If you should have any questions or require additional
information, please do not hesitate to contact me at 919. 361. 5000.
Sincerely,
MCADAMS
Ray Watson, PE
Technical Manager, National Brands
RW/cg
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