20220750 Ver 1_Riparian Buffer Authorization Review Letter 10-7-22_20221007

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WATERSHED PROTECTION DEPARTMENT

P.O. Box 548
Pittsboro, NC 27312
PHONE: [phone]

RIPARIAN BUFFER AUTHORIZATION REVIEW LETTER

October 7, 2022

Mr. Scott Teagarden
227 Stagecoach Road
Chapel Hill, NC 27514

Project Name: Boulder Creek Trail

The Chatham County Senior Watershed Specialist reviewed your Riparian Buffer Authorization
Application resubmitted on October 4, 2022, and made the following comments:

Riparian Buffer Authorization Application
1. Please provide the Nearest Road Intersection
2. Please provide the Subdivision Name
3. Please provide the landowner telephone number
4. Please provide the landowner email address
5. Impact summary must be included in the application or as a stand-alone attachment. It cannot
be embedded into the plans.
a. Project Impact Summary Table
i. Please indicate which streams/buffers are related to which impact. Use different
hatching and colors for each impact on the plans. Reference these
hatching/colors in impact summary.
ii. Break out Zone 1, Zone 2 Inner, Zone 2 Outer, and parallel vs perpendicular
impacts
iii. Include utility crossings for electric, septic and others with defined limits and
maintenance corridors
6. Please provide the “Final General Permit Verification” from USACE.

Buffer Impact Map
7. Include utility crossings with defined limits and maintenance corridor dimensions (if these are
not provided the homeowners must complete the No Practical Alternatives review process
prior to obtaining permits for homebuilding.)
8. Stream and Buffer Impacts Table should be broken down like Inventory Table in Item 5 above,
referencing hatching and colors on plans with totals for each zone and a combined total for all
impacts.

Soil Erosion & Sedimentation Control Plan Comments
9. Expand limits of disturbance to include area around riprap pad for each culvert.
10. Confirmation is needed that this submittal will not address the septic and utility crossing.

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Stream Crossing Details
Impact 1 Details
11. Step 1
a. No comments
12. Step 2
a. This step should show excavation of stream for culvert installation. Overhead plan
view and a side profile detail view that indicates excavation width and depth, pump
around locations, backfill materials and depth, culvert placement, riprap pad locations,
and fill depth for riparian buffer to this point.
b. Show excavation pits and grids for headwall construction.
c. Show excavation pits for pipe installation (length, width, and depth based on pipe
manufacturers specifications).
d. No culvert should be shown in this step.
e. Add the above items into the construction sequence.
13. Step 3
a. This step shows the backfill and grading necessary for backfill of the culvert.
b. Show construction of headwalls
c. Include profile or cross section view of pipe excavation and headwall excavation. This
view should include full width of excavation, dimensions and type of backfill material,
depth of cover, pipe embedded in stream bed.
d. Add the above items into the construction sequence.
e. This step should show clearing/grading to the second side of the stream crossing,
showing necessary erosion control measures and tree fences up.
14. Step 4
a. This sheet should show final conditions. Show final conditions and stabilization of the
impacted area.
b. Show a final profile view of the culvert crossing with total backfill shown through the
riparian buffer.
c. Show all utilities and their easements/maintenance corridors. Electric and fiber utilities
should be shown over top of the culvert.
15. If septic crossing will be permitted with this authorization, then it will require tis own crossing
sequence and profile/cross section views.

Impact 2 Details
16. Redesign according to comments on Impact 1.

This completes the review of the Riparian Buffer Authorization Application. Additional comments may
follow based on the response to the above comments.

Please only resubmit those documents required to adequately address the comments listed
above. A full resubmittal packet is not necessary.

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If you have any questions, please do not hesitate to contact me directly.

Sincerely,

Drew Blake
Assistant Director, CESSWI
Chatham County Watershed Protection Department

CC: Chase Bergeson, Spangler Environmental
Jack Royal, Project Manager, Advanced Civil Design, Inc.
Justin Hasenfus, Watershed Specialist, Chatham County Watershed Protection Dept.
Rachael Thorn, Director, Chatham County Watershed Protection Department
Paula Phillips, Land Use Administrator I, Chatham County Planning Department
Jason Sullivan, Director, Chatham County Planning Department