NCC241171_ESC Approval Submitted_20240417

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
DOUGLAS R.ANSEL
Interim Director NOR
Environmental,
Quality
January 19,2023
LETTER OF APPROVAL WITH MODIFICATIONS
KH Wesley Chapel, LLC
Attention: Mike McLendon, Authorized Signatory
105 NE lsr Street
Delray Beach, Florida 33444
RE: Project Name: Cresswind-Phase 4
Acres Approved: 44.0
Project ID: UNION-2022-099
County: Union, City: Monroe
Address: Potter Road
River Basin: Catawba
Stream Classification: Other
Submitted By: Matthew Kiker, PE, Thomas & Hutton
Date Received by LQS: January 4, 2023
Plan Type: Revised
Dear Mr. McLendon:
This office has reviewed the subject erosion and sedimentation control plan. We find the plan to be acceptable
with modifications and hereby issue this letter of Approval with Modifications. The Modifications Required for
Approval are listed on the attached page. This plan approval shall expire three (3) years following the date of
approval, if no land-disturbing activity has been undertaken, as is required by Title 15A NCAC 4B .0129.
As of April 1, 2019, all new construction activities are required to complete and submit an electronic Notice of
Intent (eNOI) form requesting a Certificate of Coverage (COC) under the NCG010000 Construction General
Permit. After the form is reviewed and found to be complete,you will receive a link with payment instructions
for the $100 annual permit fee. After the fee is processed, you will receive the COC via email. As the
Financially Responsible Party shown on the FRO form submitted for this project, you MUST obtain the COC
prior to commencement of any land disturbing activity. The eNOI form may be accessed
at deq.nc.gov/NCG01. Please direct questions about the eNOI form to the Stormwater Program staff in the
Raleigh central office. If the owner/operator of this project changes in the future, the new responsible
party must obtain a new COC.
Title 15A NCAC 4B .0118(a) and the NCGO1 permit require that the following documentation be kept on file
at the job site:
North Carolina Department of Environmental Quality I Division of Energy,Mineral and Land Resources
0 II Mooresville Regional Office(610 East Center Avenue,Suite 301 Mooresville,North Carolina 28115
704-663-1699

Letter of Approval with Modifications
KH Wesley Chapel, LLC
January 19, 2023
Page 2 of 4
1. The approved E&SC plan as well as any approved deviation.
2. The NCG01 permit and the COC, once it is received.
3. Records of inspections made during the previous 30 days.
Also, this letter gives the notice required by G.S. 113A-61.1(a) of our right of periodic inspection to ensure
compliance with the approved plan.
North Carolina's Sedimentation Pollution Control Act is performance-oriented,requiring protection of existing
natural resources and adjoining properties. If, following the commencement of this project, it is determined that
the erosion and sedimentation control plan is inadequate to meet the requirements of the Sedimentation Pollution
Control Act of 1973 (North Carolina General Statute 113A-51 through 66), this office may require revisions to
the plan and implementation of the revisions to ensure compliance with the Act.
Acceptance and approval of this plan is conditioned upon your compliance with Federal and State water quality
laws, regulations, and rules. In addition, local city or county ordinances or rules may also apply to this land-
disturbing activity. This approval does not supersede any other permit or approval.
Please note that this approval is based in part on the accuracy of the information provided in the Financial
Responsibility Form, which you provided. You are requested to file an amended form if there is any change in
the information included on the foiiii. In addition, it would be helpful if you notify this office of the proposed
starting date for this project.
Your cooperation is appreciated.
Sincerely,
Shannon Leonard
Assistant Regional Engineer
Land Quality Section
Enclosures: Certificate of Approval
Modifications Required for Approval
NCG01 Fact Sheet
c: Inspection Department
ec: Matthew Kiker, PE

Letter of Approval with Modifications
KH Wesley Chapel, LLC
January 19, 2023
Page 3 of 4
MODIFICATIONS REQUIRED FOR APPROVAL
Project Name: Cresswind-Phase 4
Project ID: UNION-2022-099
County: Union
1. Verify the total disturbed limits. The plans and Financial Responsibility/Ownership Form(FRO)show 44.0
acres. Additional disturbed area was added for the SS line, but the disturbance did not change on the plans
and/or FRO. What is the total proposed land disturbance? If the disturbance exceeds 44.0 acres, provide
additional review fees. Review fees to disturb 44.0 acres have been received. Revise plans, FRO and
provide fees (if necessary).
2. There are still issues with the diversion berms. Most of the diversion berms in Phase 1 are located within
the proposed graded areas in Phase 2. Therefore, the diversion berms cannot remain intact and functional
to divert the runoff as shown on the plans in Phase 1 and into Phase 2. The grading in Phase 2 will
completely remove the diversion berms. There will be no diversion berms remaining to divert the runoff
into the basins. In addition, due to the removal of the diversion berms, the drainage areas to temporary
Basins #1 and #2 will increase beyond what they were designed to control. There are other areas where
diversion berms are needed to divert upland areas to the basins(e.g. Sheets EC1.1,EC 1.4,EC1.5,etc.). The
diversion berms need to be located along the outer perimeter of the site so the berms can remain intact and
functional throughout all phases of construction. Diversion beiiiis must be provided in all necessary plan
phases. With the removal of the diversion balms,there are many areas that will be in direct violation of the
NCG01 permit(e.g. areas of 1 ac or more needs to be treated with a skimmer basin). If the diversion berms
cannot obtain positive drainage to the current proposed basins, additional basins shall be provided on the
plans and the basin shall be properly sized.
3. All 3 basins (#1, #2 and#5)must be sized for the maximum drainage area they will ever receive throughout
any phase. The drainage area delineation to Basins #1 and #2 in Phase 1 is not correct. In addition, the
drainage area to these basins appears to increase as the grading progresses into Phase 2. Therefore, these
basins are not sized properly. Design calculations were not provided to show required sizing of basins in
Phase 2. Design calculations must be provided for all basins in each phase. This includes Basin #5 since
this is a permanent BMP. It is unclear why there are different rainfall intensities being used to size basins.
The 10-yr rainfall intensity of 7.03 in/hr seems low. The typical 10-yr storm intensity should be at least
7.26 in/hr. You can also use NOAA rainfall data to size basins if desired. If NOAA rainfall data is used,
provide supporting data to show rainfall intensities for this specific site location. Basins #1 & #2 must
remain intact and functional in Phase 2. The Phase 2 plans need to show proposed storm drainage
temporarily stubbed off into the basins as necessary. Provide a Phase 3 plan with an adequate construction
sequence on how to remove Basins#1 and#2 to allow proposed site improvements within basin footprints.
Ensure the construction sequence specifically identifies proposed storm drainage installation that will be
required to remove Basins#1 and#2. Ensure notes on the plans identify the following elevations for basins:
top of dam, emergency spillway (EMS), top of riser, skimmer invert and bottom of basin. For riser basins,
provide a minimum 1' of elevation between top of dam & EMS and a minimum 1' of elevation between
EMS and top of riser. The minimum required surface area shall be provided at the top of the riser. Any
low weir type openings shall be temporarily plugged unless the surface area is provided at the elevations of

Letter of Approval with Modifications
KH Wesley Chapel, LLC
January 19, 2023
Page 4 of 4
the low weir openings. For standard skimmer basin(no riser),provide a minimum 1.5'of elevation between
top of dam and EMS. The minimum required surface area shall be provided at the EMS elevation. All
basins shall have a minimum 2' of elevation between skimmer invert and outlet structure for the specific
measure (e.g. riser or EMS). It is recommended that Basin #2 be moved as far downstream as possible.
Basin#1 needs to be properly situated within the existing drainage channel as far downstream as possible.
Also,the excavation for Basin#1 needs to extend to the SE as much as possible so that upland areas can be
directed into the basin.
4. There are major plan issues on Sheet EC1.5 because the diversion berm to Basin #5 cannot remain intact
and functional within the proposed graded area as shown on the plans. On Sheet EC2.5,the diversion berm
in Phase 1 is completely removed because the proposed fill slopes have been constructed. The silt fence
located below Lot 495, below toe of fill for cul-de-sac, and below fill slope near SS line is not adequate.
Provide diversion berms to adequately sized skimmer basins for these locations, which can remain intact
and functional throughout all phases. In addition,provide any necessary construction sequence that may be
needed for these areas.
5. Adequately sized temporary slope drains shall be provided to convey runoff down fill slopes until the
permanent storm drainage is installed.
6. Verify barrel pipe inlet invert for 42" RCP in Basin#5 on Sheet EC1.5. The plans show the inlet invert to
be Elev. 570.0' and the outlet invert to be Elev. 570.0'. Correct proposed inverts to allow for the 67 LF of
pipe to be installed at 1.5% slope.
7. Provide the wet pond design calculations for BMP #5. Ensure riser and barrel pipe are sized to convey
anticipated flows. Also, ensure buoyancy calculations for riser is provided.
8. Two sets of revised plans and one set of design calculations shall be submitted to this office showing the
required plan changes noted above. The revised plans shall be submitted prior to the start of land disturbance
activities.
1. Observation Comment (not a required modification): On Sheet C3.29, for the permanent detention
structure, the top of the riser structure is shown to be at Elev. 578.5' and the Emergency Spillway (EMS) is
shown to be at Elev. 578.5'. This type of design will allow water to flow over the primary riser structure
and out the EMS at the same time. This condition will likely lead to more frequent activation of the EMS,
which could cause long terra erosion issues in the EMS. It is highly recommended that a minimum 1' of
free-board be provided between the top of the primary riser structure and the EMS. This would allow typical
flow events to pass through the riser structure and larger storrn events to pass through riser and EMS (when
riser cannot pass the total flow). A typical recommendation is to provide a minimum 1' of free-board
between the top of the primary riser structure&the EMS and a minimum 1' of free-board between the EMS
and top of dam.

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