20050732 Ver 06_More Info Received_20070607

Environmental Consultants, PA
Road Raleigh, North Carolina 27614 Phone: [phone] Fax: [phone]
www.SandEC.com

NC Division of Water Quality
Attn: Mr. John Dorney
2321 Crabtree Boulevard
US Army Corps of Engineers
Attn: Mr. Monte Matthews
6508 Falls of Neuse Road
Suite 250 Suite 120 ~ j
Raleigh, NC 27604 Raleigh, NC 27615 --
Re: Revised Impact Maps for the Approved Brier Chapel Development
Dear Mr. Dorney and Mr. Matthews:
The purpose of this letter is to provide a modification to the previously submitted impact
maps for six of the previously permitted road crossings and one of the previously
permitted utility impacts associated with Brier Chapel. The proposed impacts for five of
the previously permitted road crossings (Crossings C, F, G, H and n has increased from
what was previously requested primarily due to NC DOT requiring design changes in the
roadway's stream crossing structures. The previously permitted road Crossing K has
been eliminated. Utility crossing Section.? has also increased slightly due to a shift to the
south to address constructability issues. Bridge Crossing Q and R are new proposed
Pedestrian bridges that result in minor wetland impacts. These pedestrian bridges are part
of the walking trails incorporated into the Brier Chapel Development as discussed in the
original application submittal.
The site design within the area of Crossing K, which was approved with 150 linear feet of
intermittent/unimportant stream impacts and 10,106 square feet (0.2320 ac.) of wetland
impact, has been redesigned so as to avoid the proposed impact.
Overall, the increase in the proposed permanent impacts to perenniaUimportant channels
totals an additional 256 linear feet from what was previously approved. The increase in
proposed permanent wetland impacts total an additional 6,638 square feet (0.1524 ac)
from what was previously approved. The increase in temporary wetland impacts totals
6,006 square feet or 0.1379 acres. Crossings with increased impacts include Utility
crossing Section 7, Road Crossings C, F, G, H and I and the addition of two pedestrian
bridge crossings Q and R (see attached). It is important to note that Crossing K which
proposed 1 SO linear feet of stream impact and 10,106 square feet (0.2320 ac) of wetland
impact will be completely avoided and the relocated utility crossing 7 which originally
proposed 201inear feet of stream impact will also be avoided.
Charlotte Office: Greensboro Office:
236 LePhillip Court, Suite C 3817-E L vndale Drive
Concord, NC 28025 Greensboro, NC 27455
Phone: [phone] Phone: [phone]
Fax: [phone] Fax: (3"sb)540-8235
~_,: June 7, 200.7
J1,1N ~ "7_U07 S&EC Project # 5815.W1
DWQ# OS-0732 ,~/et' (,
[IEf~R - tiNATER ;<.: ~L!TY Action ID #200121252
1W£TLANDB P.;JD STf~pAl^~grER 6RAhc~!

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Proposed bridge crossing C increased proposed wetland impacts from the previously
approved f 8 square feet (0.0002 ac) to 58 square feet (0.0013 ac) for the final bridge
piers [net increase of 50 square feet (0.0011 ac)]. There will also be 25 square feet
(0.0006 ac) of temporary wetland impact due to apier-supported temporary work bridge.
Proposed crossing F increased proposed impacts to streams from the previously approved
155 linear feet of channel to 234 linear feet of channel (net increase of 79 lineaz feet).
Proposed crossing G increased proposed impacts to streams from the previously approved
238 lineaz feet of channel impact to 302 linear feet of channel (net increase of 641ineaz
feet). Additionally, crossing G increased proposed .impacts to wetlands from the
previously approved 130 square feet (0.0030 ac) to 415 square feet (0.0095 ac) [net
increase of 285 squaze feet (0.0065 ac)].. Proposed crossing H increased proposed
impacts to streams from the previously approved 166 linear feet of channel to 2791ineaz
feet of channel (net increase of 113 linear feet). Proposed crossing I only increased
proposed impacts to wetlands from the previously approved 13 square feet (0.0003 ac) to
279 squaze feet (0.0068 ac) [(net increase of 284 square feet (0.0065 ac)]:
Proposed utility crossing 7 increased proposed temporary impacts to wetlands from the
previously approved 5,358 square feet (0.1230 ac) to 11,339 squaze feet (0.2603 ac) [net
increase of 5,981 square feet (0.1373 ac)].
Proposed pedestrian bridge Q will result in 10 square feet (0.0002 ac) of permanent
wetland impact due to 8-inch diameter driven piers to support the bridge spans. Proposed
pedestrian bridge R will result in 20 square feet (0.0005 ac) of permanent wetland impact
due to 8-inch diameter driven piers to support the bridge spans.
Previously Proposed Net

Impact
Approved Stream
Stream Impact
Difference previously Approved Proposed Wetland
Net Difference (ac)
I act Wetland Impact (ac) Impact (ac)
Utility Crossing Section 7

(tE1~~Y) 20 0 -20 0.1230 0.2603 +0.1373
Crossing C 0 p 0 f 0
0002 0.0006 temp/ + 0.0006 temp/
ent . 0.001 erm +0.0008 erm•
Crossing F

ermanent 155 234 + 79* 0 0 0
Crossing G

Went 238 302 + 64* 0.0030 0.0095 + 0.0065
Crossing H

Went 166 279 + 113* 0 0 0
Crossing I
ermanent 91 91 0 0.0003 0.0068 +0.0065
Crossing K
ermanent 150 0 -150 02320 0 -0.2320
Crossing Q
eimanent 0 0 0 0 0.0002 + 0.0002
Crossing R

ennanent 0 0 0 0 0.0005 + 0.0005
820
Totals (800 perm/ 906 +86~ 0.3585 0.2783 -0.0802
.,
20 tem
- v- me nee anrerence m streams, lib linear feet are additional permanent perenniaUmportant channel impacts; the
decrease to stream impacts is for temporary impacts as well as impacts to intermittent unimportant channel
* of the increase in stream impacts Crossing C required no mitigation, Crossing F required 2:1 mitigation and Crossings G
and Ii required 1:1 mitigation
~~~
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Stream and wetland mitigation for the Brier Chapel development has been addressed
through payment into the NC Ecosystem Enhancement Program as well as The Harpers
Crossroads stream mitigation site. Additionally, all remaining streams and wetlands on
the Brier Chapel site have been placed within a conservation easement to preserve them
in perpetuity. These two mechanisms far exceed the required mitigation necessary for the
approved impacts for the Brier Chapel development. Therefore, we do not feel that these
additional requested stream and wetland impacts will necessitate the need for additional
onsite or offsite mitigation.
The overall impact totals for the project, including those proposed within this addendum,
total 1,668 LF of permanent perennial/important stream channel impacts, 0.448 acres of
permanent wetland impact, 91 LF of permanent intermittent stream channel impact, 211
LF of temporary stream channel impact, and 0.2749 acres of temporary wetland impacts.
Please call or email me at NThomsonnsandec.com if you have any questions or require
further explanation.
Sincerely
Nicole Thomson
Regulatory Specialist
Attachments: Revised Overall Utility Map (1 sheet)
Revised Utility Impact Map (1 sheet)
Previously Approved Utility Impact Map (1 sheet)
Revised Overall Impact Map (1 sheet)
Revised Road Crossing Impact Maps (6 sheets)
Previously Approved Road Crossing Impact Maps (6 sheets)
New Pedestrian Bridge Crossing Impact Maps (2 sheets)

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PROJECT NO. NEW-0.3000 THE JOHN R. McADAMS
® B C~I.APEL COMPANY, INC.
„~', FILENAME: OV8P4~~ Utl~lty
ENGINEERS/PLANNERS/SURVEYORS
d SALE: N.T.S. UTILITY Cr~R~~O~SSING SECTION-SI'Z`E MAP RESEARCH TRIANGLE PARK, NC
~ DATE: C~T[.7 C+OU~Y, N~Aiii ~wL'~L\QLlir['1 (g19)H3811b000 ZIP 27709-4005
05-25-07

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IMPACT TOTAL S
CHANNEL IMPACT=20 LF (0.005 AC.)
WETLAND IMPACT=0.123 AC.
NOTES:
1. TEMPORARY EROSION CONTROL MEASURES
SHALL BE IMPLEMENTED DURING CONSTRUCTION
OF THE UTILITY CROSSINGS
2. TEMPORARY RIP-RAP STABILIZATION SHALL
BE IMPLEMENTED AT STREAM CHANNELS DURING
CONSTRUCTION OF THE UTILITY CROSSINGS AND
REMOVED UPON STABILIZATION.
3. WETLANDS SHALL BE RE-SEEDED WITH
WETLANDS SEED MIX UPON CONSTRUCTION
COMPLETION.
PROJSCr xo. NEW-03000
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a ~ DATE: 5-~ 2-2
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GRAPHIC SCALE
50 0 25 50 100
1 inch = 50 ft.
B C~~APEL
U'T`ILITY CROSSING SECTION-7
CHATHAM COUNTY, NORTH CAROLINA
LEGEND ~ _~~~ ; ; `;
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WETLANDS;'IMPA AREA
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CHANNEL IMPACT AREA
~`~\~~~~ 20' WIDE CONSTRUCTION
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THE JOHN R. McADAMS
COMPANY, INC.
ENGIlVE6RS/PLINNERS/SURVEYORS
RESRARCH TRIANGLE PARK, NC
P.D. HOX 14005 2tp 27709-4005
(919) 961-500D

WETLANDS
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EXISTING
WATER
SURFACE
(TYP. )
WETLANDS
DELINEATION
LINE (TYP.)
WETLANDS
PREVIOUSLY AUTHORIZED IMPACT
~ACTIDN ID # 200121252
TEMP. CHANNEL IMPACT = 20 LF (0.005 AC.)
TEMP. WETLAND IMPACT = 0.123 AC.
PROPOSED MODIFICATION:
TEMP. CHANNEL IMPACT = 0 LF (0.00 AC.)
(NO CLASSIFIED CHANNEL IN THIS AREA)
TEMP. WETLAND IMPACT = 0.2603 AC. ,
NET DIFFERENCE:
TEMP. CHANNEL IMPACT = -20 LF (-0.005 AC.)
TEMP. WETLAND IMPACT - +0.1373 AC.
NOTES:
1. TEMPORARY EROSION CONTROL MEASURES
SHALL BE IMPLEMENTED DURING CONSTRUCTION
OF THE UTILITY CROSSINGS
2. TEMPORARY RIP-RAP STABILIZATION SHALL
BE IMPLEMENTED AT STREAM CHANNELS DURING
CONSTRUCTION OF THE UTILITY CROSSINGS AND
REMOVED UPON STABILIZATION.
3. WETLANDS SHALL BE RE-SEEDED WITH
WETLANDS SEED MIX UPON CONSTRUCTION
COMPLETION.
LEGEND
WETLANDS IMPACT AREA
CHANNEL IMPACT AREA
40' WIDE CONSTRUCTION
CORRIDOR
GRAPHIC SCALE
50 0 25 50 100
1 inch = 50 ft.

® raaECr xo. NEW-03000

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ExAMe
B CHAPEL
THE JOHN R. McADAMS
COMPANY
INC
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d SCALE: ~
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a xESEASCH TxuxcLE PAR%, xc
~ DATE: (`'HI~Tf';tAM ~.OUN1Y, TTORTH CAROLINA ZIP zv709-4005
05-25-2007 [phone]
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EXISTING
CREEK BANK
(TYP.)

40' WIDE CONSTRUCTION CORRIDOR
FOR VARIOUS PUBLIC/PRIVATE UTILITIES
(QUANTITY AND SIZES TO BE DETERMINED)

PROJECT N0. NEW-03000 THE JOHN R. McADAMS
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~ FILENAME~VERALL IMPAC r ENGINEERS/PLANNERS/SURVEYORS
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WETLAND IMPACT=APPROX. 8 SF
(12" X 12" PILES, SPACED AT 7'-8' INTERVALS)
PROPOSED MODIFICATION:
CHANNEL IMPACT=O LF GRAPHIC SCALE
WETLAND IMPACT=APPROX. 58 SF (FINAL BRIDGE PIERS) 40 0 20 40 80
TEMPORARY WETLAND IMPACT=25 SF (TEMP. BRIDGE PIERS)
NET DIFFERENCE:
WETLAND IMPACT=+50 SF
TEMPORARY WETLAND IMPACT=+25 SF (TEMP. BRIDGE PIERS) 1 inch = 40 ft.
NOTE:
1. THREE (3) 36" INCH DIAMETER REINFORCED CONCRETE COLUMNS ARE REQUIRED AT EACH OF TWO (2) INTERIOR
BENTS TO SUPPORT THE FINAL BRIDGE SPAN. EACH COLUMN IS SUPPORTED ON A 42" DIAMETER DRILLED SHAFT.
CONSTRUCTION OF THE DRILLED SHAFTS WILL REQUIRE DRILLING INTO BEDROCK CREATING A DE MINIMUS DISCHARGE
INTO WATERS OF THE UNITED STATES.
PROJECT N0. NEW-03000
®
B
THE JOHN R. McADAMS
~ ~'~NA°IEBridge Crossing CHAPEL COMPANY, INC.
d SCALE:
1 "-40 BRIDGE CROSSING SECTION-C ~'cINEERS/PLANNERS~svRVex9RS
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CHATHAM COUNTY, NORTH CAROLINA RESEARCH TRIANGLE PARE, NC
P.o. BOX 4005 ZIP 27709-4005
~ 05-25-07
(919) 381- 900
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v NOTE:
c 12° X 12" PILES, SPACED A7 7'-8' INTERVALS MAY BE REQUIRED TO ADEQUATELY SUPPORT SPAN. CONSTRUCTION
METHODS MAY INCLUDE DRILLING INTO BEDROCK CREATING A DE MINIMUS DISCHARGE INTO WATER OF THE U.S.
°o HOWEVER, THE PILES WILL BE DRIVEN INTO PLACE AND WILL NOT REQUIRE CONCRETE FOOTERS OR ABUTMENTS.
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PROascT tJO. NEW-03000 B C~~APEL
~ THE JOHN R. McADAMS
~ A"!fi` Culvert_Exhibits COMPANY, INC.
e Ste: CROSSING SECTION-F ENGINEERS,PLANNERS,SURVEYURS
~ ),._30'
~~A/~~~~~//~~~~~~ T~~,.~ RESEARCH TRIANGLE PARK, NC
[n DATE: C17Aa11L11-i COVl~ 1 Z ~ NO~~ C,~~~A P.O. BOX 14005 ZIP 2770a-4005
05-25-2007 (eIS) set-aooo

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PROrecr No. NEW=03000 B CHAPEL THE JOHN R. McAnAMS
~NA11E~Ewo3ooo-c(F COMPANY, INC.

C scALE:
1 "-40~
CULVERT CROSSING SECTION-F axcnaEERS/Pi.enNass/suxv~roas
RESEARCH 7RUNGLE PARK, NC
DATE: C~~i~ COU~Y, N~KI~i CAROI I11TA P.0. HOX 14005 zrP 27709-1005
~ 11-29-05 [phone]

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PREVIOUSLY AUTHORIZED CHANNEL IMPACT
IACTION ID ~ 200121252.
WETLANDS IMPACT = 130 SF
CHANNEL IMPACT = 238 LF, 827 SF
186 LF 54" RCP (PIPES BURIED 1.0')
GRAPHIC SCALE 35 LF RIP RAP APRON

ao
0 20 4o So PROPOSED MODIFICATION:
WETLANDS IMPACT = 415 SF
CHANNEL IMPACT = 302 LF, 964 SF
1 inch = 40 ft 225 LF 60" CMP (PIPES BURIED 1.0')
. 17 LF RIP RAP APRON
NET DIFFERENCE:
WETLANDS IMPACT = +285 SF
CHANNEL IMPACT = +64 LF, +137 SF

Pxorecr No. NEW-03000 B CHAPEL THE JOHN R. McADAMS
~ FR,EN,giE: Culvert
Exhibits COMPANY, INC.
_
e 5~~,
1 "= 40' CROSSING SECTION-G ENGINEERS/PLANNERS/SURVBIORS
~ SEBO
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°'
°A~` ~.I~~M Cfl1.1~Y, NO~~ ~O~A O
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ZIP
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4005
05-25-2007
[phone]

PRE\/I~I,~SLY PPF~~/Ea
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GRAPHIC SCALE
~ 40 0 20 40 gp WETLANDS IMPACT=130 SF
o CHANNEL IMPACT=238 LF, 827 SF
0 186 LF 54" RCP (PIPE BURIED 1.0~)
M 1 inch = 40 ft. 35 LF RIP RAP APRON
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PROTECT N0. NEW-03000 BF-IAR C~~
' THE JOHN R. McAnAMS
F1~" wo3ooo-G(c A~
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INC
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SCALB: ,
1'-4O CULVERT CROSSING SECTION-G ~°~'s"~°~"°'~
9 RESEARCH TRLINCLE PARK
NC
~ DATE: 11 -29-05 CHA'1HAM ~~/~1~~ i, NOi~iil ~.[ai~O~A ,
P.O. BOX 14005 ZlP 27709-4005
[phone]

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(ACTION ID ~ 200121252E
CHANNEL IMPACT = 166 LF, 995 SF
GRAPHIC SCALE (2) 111 LF 84" RCP (PIPES BURIED 1.0')
40 0 20 4o ao 45 LF RIP RAP APRON
PROPOSED MODIFICATION:
CHANNEL IMPACT = 279 lF, 1552 SF
1 inch = 40 ft. (2) 157 LF 84" CMP (PIPES BURIED 1.0')
44 LF RIP RAP APRON
NET DIFFERENCE:
CHANNEL IMPACT = +113 LF, +557 SF

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PR°lecr xo. NEW-03000 ~ ~T T A T~T THE JOHN R. McADAMS
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MECHANICALLY PILE-DRIVEN TO AN ALLOWABLE BEARING CAPACITY OF 10 TONS CREATING A DE MINIMUS DISCHARGE
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PROJECT N0. NEW-03000 B CHAPEL THE JOHN R. McADAMS
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PROJECT xo. NEW-03000 BRIAR C THE JOHN R. McADAMS
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