20071093 Ver 4_More Info Received_20110419

WITHERS & RAVENEL
ENGINEERS I PLANNERS 1 SURVEYORS
April 19, 2011
NC-Division of Water Quality
Attn: Mr. Ian McMillan
512 N. Salisbury Street - 9th Floor
Raleigh, NC 27604
Re: Crabtree Creek North Bank 42" Emergency Sewer Replacement
Submittal of Additional Information for Authorization of Permanent Stream
Impacts
DWQ Project # 07-1093, Ver. 2
Dear Mr. McMillan:
This letter is in response to the email from Lauren Witherspoon with DWQ, dated
February 10, 2011, regarding the placement of rip-rap within the disturbed areas of the
stream within the existing 40' sewer easement associated with sewer crossings of Marsh
Creek and the stream crossing adjacent to the railroad bridge.
On behalf of the City of Raleigh, we are requesting a revision to the DWQ 401-
certification for the 42" Crabtree Creek North Bank Sewer Emergency Replacement
project. The current request is for 57 if of permanent stream impacts, 68 If of
temporary stream impacts, 0.294 acres of temporary wetland impacts and 1,024 sq
ft of permanent buffer impacts to Zone 1 associated with the replacement of the 42"
Crabtree Creek North Bank Sewer.
Project History
Approximately 4500 if of the Crabtree Creek North Bank 42" sewer line was replaced.
The replacement of the 42" sewer line resulted in 125 if of temporary stream impacts and
0.294 acres of wetland impacts, which were authorized under a NWP 3 from the Corps
and a Water Quality Certification and Buffer Authorization from DWQ (DWQ Project
#07-1093, Ver. 2).
Proposed Permanent Impacts
During the replacement of the 42" sewer line, it was determined that rip-rap was needed
to stabilize the disturbed stream banks of the crossing of the UT to Crabtree Creek,
adjacent to the railroad bridge (Impact Exhibit 3) and the Marsh Creek stream crossing
(Impact Exhibit 6). The rip-rap was necessary to stabilize the disturbed stream banks, as
the flow rates within these streams were so high that the vertical stream banks would
111 MacKenan Ddw I Cary, NC 27511 I tel.: [phone]Mo I fax: [phone]oo8 I www.withefsravenel.com
14w Commonwealth Drive I Suite 101 I Wilmington, NC 284o3 l tel: 9io.256.9277 I fax: 91o.256.2584
416 D Gallimore Dairy Road I Greensboro. NC 274o9 I teh 336.993.55o4 I fax: [phone]oo8
N.C. Engineering Board No. C-o832
WITHERS & R"ENEL
ENGINEERS I PLANNERS I SURVEYORS
erode and fail without stabilization. Lauren Witherspoon with your office has reviewed
these crossings and concurs that stabilization with rip-rap is necessary to prevent erosion.
Impact Exhibit 3
The proposed rip-rap within the stream bed of the UT to Crabtree Creek (Impact Exhibit
3) is the result of replacement of existing rip-rap in 12 if of stream that was installed
when the 42" sewer was originally constructed. Since the rip-rap within the stream bed
was existing, the replacement of the rip-rap within the stream bed was authorized under
the original NWP 3 and DWQ 401 Water Quality Certification (DWQ Project #07-1093,
Ver. 2). Additional rip-rap will be placed on the stream banks above the OHW at this
crossing for stabilization. Since no rip-rap will be placed within the stream bed, there
will be no stream impacts. However, Lauren Witherspoon determined that the placement
of rip-rap on the stream banks will result in permanent buffer impacts, and requested that
the buffer impacts be quantified and addressed in the Buffer Impact Table. Therefore,
placement of rip-rap on the stream banks at Impact Exhibit 3 will result in 462 sq ft of
permanent buffer impacts within Zone 1.
Impact Exhibit 6
The placement of rip-rap within the stream bed and banks of Marsh Creek are necessary
to stabilize the disturbed areas of the stream and will result in 45 if of permanent stream
impacts. Due to the vertical banks and high flow rate within Marsh Creek, the rip-rap is
necessary to stabilize the disturbed areas to prevent erosion and failure of the stream
banks. The placement of rip-rap on the stream banks will result in 742 sq ft of permanent
buffer impacts within Zone 1.
The Impact Tables within the PCN have been revised to reflect the placement of rip-rap
within the streams and buffer, as previously discussed. Copies of the PCN Impact Tables
have been provided as an Appendix. Revised Impact Exhibits 3 & 6 have also been
provided as an Appendix.
Mitigation
Since the proposed permanent stream impacts are less than 150 If, there is no proposed
stream mitigation.
Coordination with Corps of Engineers
Jamie Shern with the Corps of Engineers was contacted regarding the permanent stream
impacts associated with the use of rip-rap for stream stabilization. In an email dated
iii MacKenan Drive I Cary, NC 275111 tel.: gig-469.334° I fax: [phone]oo8 I www.vAtheFsrdvenel.com
14io Commonwealth Drive Suite 101 Wilmington, NC 28403 tel: 9io.256.92771 fax: gio.256.2584
416 D GaRimore Dairy Road I Greensboro, NC 274og I teh 336.993.55o4 I fax: 91L9.467.6oo8
N.C. Engineering Board No. C-o832
WITHERS & RAVENEL
ENGINEERS I PLANNERS I SURVEYORS
March 2, 2011, Jamie determined that the permanent stream impacts associated with the
use of rip-rap for stabilization are covered by NWP 3. A copy of email from the Corps
has been provided as an Appendix.
Please feel free to call if you have questions or require additional information.
Sincerely,
Troy Beasley
WITHERS & RAVENEL INC.
Attachments -
1) Revised PCN Impact Tables
2) Revised Impact Exhibits 3 & 6
3) Email from Corps of Engineers
1a1 MacKenan Drive I Cary, NC 275111 tel.: [phone]Mo I fax: [phone]oo8 I www.withersmvenel.com
i4lo Commonwealth Drive I Suite sot I Wilmington, NC 284031 tel: 9'o.256.92771 fax: [phone]
416 D Gallimore Dairy Road 1 Greensboro, NC 274o9 I tel: [phone] fax: [phone]oo8
N.C. Engineering Board No. C-0832
C. Proposed Impacts Inventory
1. Impacts Summary
1 a. Which sections were completed below for your project (check all that apply):
® Wetlands ® Streams - tributaries ? Buffers
? Open Waters ? Pond Construction
2. Wetland Impacts
If there are wetland impacts proposed on the site, then complete this question for each wetland area impacted.
2a. 2b. 2c. 2d. 2e. 2f.
Wetland impact Type of jurisdiction
number - Permanent Type of Type of wetland Forested (Corps - 404, 10 Area of impact
(P) or Temporary (T) impact (if known) DWQ - non-404, other) (acres)
Impact Exhibit 1 Trench and
Herbaceous ? Yes ® Corps
0.067 ac
? P ® T Backfill ® No ® DWQ
Impact Exhibit 2 Trench and
Herbaceous ? Yes ® Corps
0.010 ac
? P ® T Backfill ® No ® DWQ
Impact Exhibit 4 Trench and
Herbaceous ? Yes ® Corps
016 ac
0
? P ® T Backfill ® No ® DWQ .
Impact Exhibit 5 Trench and
Herbaceous ? Yes ® Corps
201 ac
0
? P ® T Backfill ® No ® DWQ .
2g. Total wetland impacts 0.294 ac
2h. Comments:
3. Stream Impacts
If there are perennial or intermittent stream impacts (including temporary impacts) proposed on the site, then complete this
question for all stream sites impacted.
3a. 3b. 3c. 3d. 3e. 3f. 3g.
Stream impact number Type of Stream name Perennial Type of jurisdiction Average Impact
-Permanent (P) or impact (PER) or (Corps - 404, 10 stream length
Temporary (T) intermittent DWQ - non-404, width (linear
(INT)? other) (feet) feet)
Impact Exhibit 2
Trench UT to Crabtree ® PER ® Corps
16 If
40 If
? P ® T Creek ? INT ® DWQ
Impact Exhibit 3
Trench UT to Crabtree ® PER ® Corps
30 If
28 If
? P ® T Creek ? INT ® DWQ
Impact Exhibit 3 Replacement
of ex stti
ng rip- UT to Crabtree ®PER
_ ®Corps
30 If
12 If
® P F
1 T Creek 1 INT
[ ® DWQ
- p
Placement of
Impact Exhibit 7 rip-rap for
Marsh Creek ® PER ® Corps
35 If
45 If
® P ? T stabilization of ? INT ® DWQ
stream banks
3h. Total stream and tri butary impacts 125 If
3i. Comments:
Page 5 of 11
PCN Form - Version 1.3 December 10, 2008 Version
4. Open Water Impacts
If there are proposed impacts to lakes, ponds, estuaries, tributaries, sounds, the Atlantic Ocean, or any other open water of
the U.S. then individually list all open water impacts below.
4a. 4b. 4c. 4d. 4e.
Open water Name of waterbody
impact number - (if applicable) Type of impact Waterbody type Area of impact (acres)
Permanent (P) or
Temporary T
01 ?P?T
02 ?P?T
03 ?P?T
04 ?P?T
4f. Total open water impacts
4g. Comments:
5. Pond or Lake Construction
If and or lake construction proposed, then complete the chart below.
5a. 5b. 5c. 5d. 5e.
Wetland Impacts (acres) Stream Impacts (feet) Upland
Pond ID Proposed use or purpose (acres)
number of pond
Flooded
Filled
Excavated
Flooded
Filled
Excavated
Flooded
P1
P2
5f. Total
5g. Comments:
5h. Is a dam high hazard permit required?
? Yes ? No If yes, permit ID no:
5i. Expected pond surface area (acres):
5j. Size of pond watershed (acres):
5k. Method of construction:
6. Buffer Impacts (for DWQ)
If project will impact a protected riparian buffer, then complete the chart below. If yes, then individually list all buffer impacts
below. If an impacts require mitigation, then you MUST fill out Section D of this form.
6a.
? Neuse ?Tar-Pamlico ? Other:
Project is in which protected basin? ? Catawba ? Randleman
6b. 6c. 6d. 6e. 6f. 6g.
Buffer impact
number - Reason Buffer Zone 1 impact Zone 2 impact
Permanent (P) or for Stream name mitigation (square feet) (square feet)
Temporary (T) impact required?
Impact Exhibit 3
® P El T Rip-
Rap
UT to Crabtree Creek ? Yes
® No
462 sq ft
N/A
Impact Exhibit 6
® P ? T Rip-
Rap
Marsh Creek ? Yes
® No
742 sq ft
N/A
6h. Total buffer impacts 1,204 sq ft N/A
6i. Comments: The 1,204 sq ft of permanent buffer impacts to Zone 1 will occur as a result of placement of rip-rap on the
stream banks for stabilization of the disturbed portions of the streams.

Page 6 of 11
PCN Form -Version 1.3 December 10, 2008 Version
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PERMANENT ZONE 1 BUFFER /
IMPACT AREA:
242 SQ. FT.
LIMITS OF STREAM
PERMANENT IMPACTED AREA:
52 SQ. FT.
12 L.F.

/ \ \
N
W E
Magnetic
LIMITS OF STREAM
TEMPORARY IMPACTED AREA: ?` ZQNE 7? RB EXISTING STREAM CROSSING
174 SQ. FT.
28 L.F. \ \
?" ` -_ \ lr
Z0 2 NRB
L Y
PERMANENT ZONE 1 BUFFER
IMPACT AREA:
220 SQ. FT. f
f
TE:
*t i Cl OF MAINTAINS
LEGEND

NEUSE RIVER RIPARIAN BUFFER:
TEMPORARY NONE
WETLANDS IMPACTS
PERMANENT NEUSE RIVER RIPARIAN BUFFER:
ZONE 1 462 SF (0.011 AC)
ZONE 2 ® NONE
CRABTREE CREEK NORTH BANK
42" EMERGENCY REPLACEMENT
IMPACT EXHIBIT 3
PERMANENT STREAM IMPACTS:
L.F. 12 LF
AREA 52 SF (0.001 AC)
TEMPORARY STREAM IMPACTS:
L.F. 28 LF
AREA •:::::: 174 SF (0.004 AC)
GRAPHIC SCALE
50 0 25 50 100
1 inch = 50 ft.
WITHERS &- RAVENEL
ENGINEERS I PLANNERS I SURVEYORS
\ ?..ti \\ \ day
\
1\
ZONE 1 NRB 1 \
f ZONE 2 NRB?
I
I I is
PERMANENT ZONE 1 BUFFER 1
IMPACT AREA:
402 SQ. FT.
NOTE:
CITY OF RALEIGH REG/LARLY MAINTAINS
TH EXISTING/40' WIDE EASEMENT
t:
a
LEGEND
NEUSE RIVER RIPARIAN BUFFER:
WETLANDS IMPACTS 1-4
TEMPORARY NONE
\ (--.t
PERMANENT STREAM IMPACTS:
L.F. 45 LF
,.,? II
AREA ::::::some 1,670 SF (0.038 AC)
PERMANENT NEUSE RIVER RIPARIAN BUFFER:
ZONE 1 742 SF (0.017 AC)
ZONE 2 ® NONE
CRABTREE CREEK NORTH BANK
42' EMERGENCY REPLACEMENT III IMPACT EXHIBIT 6
GRAPHIC SCALE
50 0 25 50 100
1 inch = 5f) ft
WITHERS &- RAVENEL
ENGINEERS I PLANNERS I SURVEYORS
N
W E
s
Mognetic
PERMANENT ZONE 1 BUFFER
IMPACT AREA:
340 SQ. FT.
LIMITS OF STREAM
PERMANENT IMPACTED AREA:
1,670 SQ. FT.
45 L.F.
C',QF
F?
\ s 1
Page 1 of 2
Beasley, Troy
Subject: FW: 42" Emergency Sewer Replacement (UNCLASSIFIED)
Attachments: ATT00001.txt
From: Shern, James F SAW [mailto:[e-mail]]
Sent: Wednesday, March 02, 20114:44 PM
To: Wheeler, Whit
Subject: RE: 42" Emergency Sewer Replacement (UNCLASSIFIED)
Classification: UNCLASSIFIED
Caveats: FOUO
Whit,
I understand that these drawings are modifications of, or in addition to, those activities required for the 4,000+
If of emergency sewer replacement that you notified me of last year. Let me know if I ever assigned you a job
number (USACE Action ID #) for the project. If not, I will need to assign the project a new number. All of the
impacts are covered by NWP 3. Please remember that the reestablishment of preconstruction contours is a
condition of NWP 3. So to the extent that class 2 riprap needs to be placed onto the bed of Marsh Creek, or
others, the riprap should match the elevation of the original stream bed. I think the intent of the condition is that
the riprap not be high enough that it could block the movement of aquatic critters during periods of low flow.
Jamie Shern
Raleigh Regulatory Field Office
Wilmington District
US Army Corps of Engineers
We would appreciate your feedback on how we are performing our duties. Our
automated Customer Service Survey is located at:
http://per2.nwp.usace.army.mil/survev.html
Thank you for taking the time to visit this site and complete the survey.
From. Wheeler, Whit [mailto:[e-mail]]
Sent: Friday, February 25, 201110:49 AM
To: Shern, James F SAW
Subject: 42" Emergency Sewer Replacement
Jamie,
Attached are drawings of the two creek crossings we discussed for the emergency work that was recently
completed along Crabtree from Raleigh Boulevard down to Marsh Creek. The drawing titled Crabtree CK is an
overall to give you the general location. The 45 feet is the run of Marsh Creek where stone is need for scour
protection. The other crossing will only have stone where it had previously existed as a stream fording just below
the railroad bridge. What permit should be fall under for this work?
Thanks,
W. Whit Wheeler, PE
Construction Projects Administrator
City of Raleigh Public Utilities Dept.
One Exchange Plaza, Suite 620
Raleigh, NC 27601
3/7/2011