HomeMy WebLinkAbout20051608 Ver 1_More Info Received_19941006.. scvre?
STATE OF NORTH CAROLINA
DEPARTMENT OF TPA.NSPORTATION
JAMES B. HUNT. JR - DIVISION OF HIGHWAYS R. SAMUEL HUNT III
GovEmoR P.O. BOX 25201. RALEIGH. N.C. 27611-5201 SECRETARY
October G, 1994
MEMORANDUM TO: Jay Bissett, Unit Head
Project Planning Unit
FROM: Robin M. Little, Environmental Specialist
Environmental Unit
SUBJECT: Results of Submerged Aquatic Vegetation
Survev for US 17.Neuse River Bridge
Relocation and Trent River Widening;
Federal-Aid., No. B?.-OOOS(33); State Project
No. 8 .1170S01; TIP No. B-2531 and BBB25,12
On august 30-31. 1994. NCDOT Environmental Unit Specialists,
Cyridi Bell, Robin Little and Eric Penley, with members of the
NCDOT Dive Team, Bill Lutz and Eric Basinger, performed a
submerged aquatic vegetation (SaV) survey in the proposed
impact areas associated with the relocation/replacement of
the John. Lawson Bridge on the Meuse River and widening of the
Freedom Memorial Bridge on the.Trent River.
METHODOLOGY
Survey methodology followed that which has been suggested by
the National Marine Fisheries Service, and which was applied
to assess SAV impacts at the.Wright Memorial Bridge site in
Currituck and Dare Counties.
Transects were run perpendicular to the shoreline at .10 meter
intervals within the temporary construction zones and within
the permanent construction limits. In most cases, the center
transect fell under the centerline, or 'began to one side of
the existing bridge within the construction easement. (See
diagrams for site locations.)
Information was collected along each transect. at 10 meter
intervals, starting at the shoreline. A-1 meter square grid,
subdivided into.sixteen 25 cm by 25 cm subplots, was placed
on the river bottom at each sampie point. The number of sub-
plots containing SAV were recorded, as was the species
composition. blade length and water depth. This information
was collected until three consequtive.empty plots were
encountered, or until the water depth reached z:pproximately
2.0 m. or 6.5 feet.
,t
J07*
Sample points within the sample plots were numbered in the
order which they were sampled and each transect was labeled
with a consequtive letter. Thus, Site 2had three sample
areas represented by 2A1 through 2VS, where 2A-L represent
the sample area and corresponding transects where Ramp DB.and
the "L" line intersect with'the shore, according to stakes
observed at the site. Ramp DC is represented by 21Ni-Q and
Ramp DA by 2R-V. Each side of the Trent River Bridge was
sampled on each side of the river.' Thus, Site 3A-B
represents the sample area on the southeast corner of the
bridge, Site.3C-D the northeast and so.on. Site 4 is located
where Ramp CD and Loop BA meet the shoreline and cross
Scotts' Creek and Site' 5 is .the intersection of the "L" line
with the east sire of the Neuse'River (Bridgeton). Species
was identified as Zostera sp. and Species "B" as
Myriophylum sp.
RESULTS
Areas of SAV impacts are indicated on the attached maps., with.
the areas mapped shown in relation.to the proposed
construction.. The total area of SAV mapped was approximately
5.3 acres. The Lawson Creek. and Scotts Creek areas had such.
dense SAV that it.was not possible to count within the grid.
so 100"coverage was assumed. Impacts were calculated as 1000
of the mapped areas beneath both permanent and temporary
construction areas.. (See attached SAV area tabulations and
calculations for breakdowns of permanent and temporary
impacts.)
SAV TOT
SITE 1:
SITE 2:
SITE 3:
SITE 4:
SITE 5:
AL IMPACTS
Lawson Creek (1000' coverage assumed.)
Ramp DB/"L" Line (No SAV.present.)
Ramp DC (No SAV present.)
Ramp DA
Freedom Memorial Bridge/Trent River
Ramp CD/Loop BA, West Side Neuse River
"L" Line/Bridgeton (No SAV present.)
0.35 ac.
0
0
0:415-ac.
1.46 ac.
0.23 ac.
0
TOTAL 2.49 ac
cc: Frank Vick, P.E., Branch Manager, P & E Branch
. Barney O'Quinn, P.E.; Assistant Branch Manager, P & E
David Robinson, Permits and Mitigation Unit
Dennis Pipkin, P. E., N.itigation Section
Charles Casey, P.E., Structures Design
SAV.AREA CALCULATIONS
Site 1 Lawson Creek 100 coverage assumed)
Permanent 3 m x 71 m = 213 sq.m. = 0.021 ha. = 0.05.ac.
Temporarv 15 m x SO m = 1200 sq. in. = 0.12 ha. = 0.30 ac.
Total = 1413 sq. m. = 0.141 ha. = 0.35 ac.
Site 2 West Side of `euse River.
No SAV present under Ramp .DB and L Lin e (2A-L), or Ramp DC
(`2.A-Q). SAV present under Ramp DA (2R-V).
Permanent 11,m x 37 in = 407 sq.m. = 0.0407..ha. = 0.10 ac.
Temporary 30 m.x 70 in = 1400 sq. m. = 0..14 ha. = 0.35 ac.
Total = 1807 sq. m. O.lS ha.= 0.T5 ac.
Site 3 Freedom Llemorial BI ri62e o ver Trent River
SAV present in perma nent.and temporary construction areas in
all four quadrants; SE (3A-B) ; NE (3C-D) ; i-W (3£-F) ; SW (30-
H); and in permanent and temporary con struction are a of Ramp ,
BD.
Permanent BD 11' m x 45 m = 495 sq.m. =.0.0495 ha. = 0.12 ac.
NE 5 in x 33 m. = 19S sq m. = 0.0193 ha. = 0.05 ac.
NW 4 m x 62 m = 243 sq.m. = 0.0245 ha. = 0.06 ac.
SW 5 m x 75 m = 3"5 sq.m. = 0.03"5 ha. = 0.09 ac.
Total 1316 sq.m. = 0.1316 In a. = 0.325" ac.
Temporarv SE 10 m x 40 m = 400 sq.m. = 0.04 ha. = 0.10 ac.
S m x 34 m = 170 sq.m. = 0.017ha. = 0.04 ac.
5 m x 26 m = 130 sq.m. ='0.013ha. = 0..03 ac.
10 m x 32 m = 320 sq.m. = 0.032ha. = O.OS.ac.
`'1V 10 m x 5S m = SSO sq.-m. = 0.053na. = 0.14 ac.
10 m x 62 m = 620 sq.m. = 0.062ha. = 0.15 ac.
SW 10 m x 75 m = 7?0 sq.m. = 0.075ha. = 0.135ac.
10 m x 96 in = 960 sq.m. = 0.096ha. = 0..24 ac
BD 14 m x 48 m = 672 sq.m. = 0.067ha. = 0.17 ac.
Total 4602 sq.m. = 0.460ha. _ 1.14 ac.
Site = West Side of Neuse River
SAV present along shoreline and in an isolated patch under
the proposed BA Loop and 1 00% c overage is assumed in Scotts
Creek.
Permanent 40 m x 12 m = 430 sq. m.= 0.043 ha. '= 0.118 ac.
Temnorarv 40 m x 7 m = 280. sq.m. = 0.02S ha. = 0.074 ac.
25 m s 7 m = 1"5 sq.m. = 0.01S ha. = 0.043 ac.
Sub-Total 453 sq.in . = O.C46 lia. = 0.114 ac.
Total 93? sq m. = 0.094 ha.. = 0.333 ac.
Site = 'reuse River. East Side. Bridgeton
No SAS' present.
SAV AREA TABULATIONS in ha. (ac.)
SITE PERMANENT TEMPORARY TOTAL
1 0.02 (0.05) 0.13 (0.30) 0.11 (0.35)
3 0.01 (0.10) 0.141 (0:35) 0.?S (0.15)
.3 0.13 (0.32) 0.4.6 (1.1?) ..0-59 (1.16)
i 0.05 (0.13) 0.05 (0.11) 0.10 (0.23)
S 0 0 0
TOTAL 0.21 (0.59) 0.77'(1.9) 1.01 (3.19)
Set/
Transect/ # Subplots/ Species Water Blade
Plot # % Cover Depth Length
1 N/A 100% B 5' 2'
2A1 0/16; 0% N/A 2' N/A
2A2 0/16; 0% N/A 5' N/A .
2A3 N/A 10' N/A
2B1 0/16; 0% N/A 10' N/A
2B2 0/16; 0% N/A 5' N/A
2B3 0/16; 0% N/A 2' N/A
2C1 0/16; 0% N/A 3.5' N/A.
2C2 0/16; 0% N/A 7' N/A
2C3 0/16; 0% N/A 9' N/A
2D1- 0/16; 0% N/A. 8' N/A
2D2 0/16; 0% N/A 6' N/A
2D3 0/16; 0% N/A 2-51 N/A
2E1 0/16; 0% N/A 2'. N/A
2E2 0/16; 0% N/A 5' N/A
2E3 0/16; 0% N/A 7' N/A
2F1 0/16; 0% N/A 3.5' N/A
2F2 0/16; 0% N/A 1.5' N/A
2F3 0/16; 0% N/A 0.5' N/A
2G1 11/16; 69% A 2' S"
2G2 0/16; 0%. N/A 6' N/A
2G3 0/16; 0% N/A 10' N/A
2H1 0/16; 0% N/A 10' N/A.
2H2 0/16; 0% N./A 6' N/A
2H3 0/16; 0% N/A N/A
211 0/16; 0% N/A 2' N/A
212 0/16; 0% N/A .5' N/A
213 0/16; 0% N/A 8' N/A
2J1 0/16; 0% N/A 81 N/A
2J2 0/16; 0% N/A 4.5' :N/A
2J3 0/16; 0% N/A 2' N/A
2K1 0/16; 0% N/A 1' N/A
2K2 0/16; 0% N/A 4' N/A
2K3 0/16; 0% N/A 8' -- N/A
2L1 0/16;, 0% N/A 7' N/A
2L2 0/16; 0% N/A 2' N/A
2L3 0/16;, 0% N/A 1' N/A
2M1 0/16; 0% N/A 1' N/A
2M2 0/16; 0% N/A 3' N/A .
2M3 0/16; 0% N/A 8' N/A.
2N1 0/16; 0% N/A 8' N/A
2N2 0/16; 0% N/A 3' N/A
2N3 0/16; 0% N/A 1' N/A
201 0/16; 0% N/A N/A
202 0/16; 0% N/A 3' N/A
203 0/16; 0%' N/A 9' N/A
2P1 0/16; 0% N/A 8.' N/A
2P2 0/16; 0% N/A 3' N/A.
1.
2P3 0/16; 0% N/A 1' N/A
2Q1 .0/16; 0% N/A if N/A
2Q2 0/16; 0% N/A 3' N/A
2Q3 0/16; 0% N/A 8' N/A
2R1 0/16; 0% N/A 0.5' N/A.
2R2 16/16; 100.% A
2R3 16/-16; 100% A 2'
2R4 4/16; 25% A 3' if.
2R5 0/16; 0% N/A 3' N/A
2R6 0/16; 0% N/A 4' N/A
2R7 0/16; 0% N/A 5' N/A
2S1 0/16; 0% N/A 5' N/A
2S2 0/16; 0% N/A 4' N/A
2S3 0/16; 0% N/A 3' N/A
2S4 16/16; 100% A 2' 1'
2S5 3/16; 19% A 2' if
2S6,. 16/16; 100% A if 1'
2S7 0/16; 0% N/A 0.5' N/A
2T1 8/16; 50% A .0.5'. 0.5'
2T2 16/16; 100% A 2' i'
2T3 16/16; 100% A 2' i'
2T4 16/16; 100% A 2' it
2T5 0/16; 0% N/A 3' N/A
2T6 0/16; 0% N/A 4' N/A
2T7 0/16; 0% N/A 5' N/A
2171 0/16; 0% N/A 5' N/A
2U2 0/16; 0% N/A 5' N/A
2U3 16/16; 100% A 3'
2U4 16/16; 100% A 3'
' 2U5 16%16; 100% A 2'
2U6 16/16; 100% A 1'
2177 0/16; 0% N/A 0.5' N/A
2U8 0/16; 0% N/A 0.5' N/A
2V1 0/16; 0%. N/A 0.5' N/A
2V2 16/16; 100% A 2'.
2V3 16/16; 100% A 2'
2V4 16/16; 100% A. 3'
2V5 5/16 ; '31% A 3'
2V6 0/16; 0% N/A 4' N/A
2V7 0/16; 0% N/A N/A
2V8 0/16;• 0% N/A 6' N/A
3A1 0/16; 0% N/A 0.5' N/A
3A2 0/16; 0% N/A 4.5' N/A
3A3 0/16; 0% N/A 5.5' N/A
3B1 0/16; 0% N/A 0.5' N/A
3B2 13/16; 81% A 0.5'
3B3. 14/16; 88% A,B 3.5' if
3B4 6/16;. 38% A,B 5.5' if
3B5 3/16; 19% A,B 7' it
3B6 0/16; 0% N/A 10' N/A
3C1. 0/16; 0% N/A 0.5' N/A
3C2 16/16; 100% A,B 1.5' 0.5'
3C3 4/16; 25% B 6' it
A
3C4 1/16;. 6% B 9'
3C5 0/16; 0% N/A 13' N/A
3D1 .0/16; 0% N/A 0.5' N/A
3D2 16%16; 100% A 2' 1!
3D3 14/16; -88% A,B 1.5' 0.5'
3D4 1/16; 6% A 6' 0.5'
3D5 0/1.6; 0% N/A 9' N/A
3D6 0/16; 0% N/A 13' N/A
3E1 0/16; 0% N/A N/A
3E2 15/16; 94% A,B 3.5' >1'
3E3 3/16; 19% A,B 4' >1'
3E4 10/16; 62% A,B 4' >1'
3E5 16/16; 100% A,B. 5' >1'
3E6 15/16; .94.% A,B 5.5' >1'
3E7 12/16; .75% A,B 6' >1'
3E8 0/16; 0% N/A 6' >1'
3F1 0/16;. 0%. N/A 3' N/A
3F2 16/16; 100% A,B 3' >1'
3F3 16/16; 100% A,B 3.5' >1'
3F4 15/16; 94% A,B 4' >1'
3F5 .16/16; 100% A,B 5' >1'
3F6 16/16; 100% A,B 5.5' >1'
3G1 8/16; 50% B .5' >1'
3G2 16/16; 100% B .5' >1'
3G3 16/16; 100% B .4' >1'
3G4 8/16; 50% B 4' >1'
3G5 12/16; 75% B 3' >1'
3G6 6/16; 38% B 3' >1'
3G7 0/16; 0% N/A 5.5' N/A
- 3G8 0/16; 0% N/A 6' N/A
`
3G9 16/16; 100.% N/A 5' N/A
3G10 8/16; 50% B- 5.5' >1'
3H1 2/16; 1.3% B 2' >1'
3H2 6/16; 38% B 4' >1'
3H3 10/16; 63% B 4' >1'
3H4 9/16; 56% B
3H5 16/16; 100% B 4' >1'
3H6 14/16; 88% B 5.5.' >1'
3H7 16/16; 100% B 5' >1'.
3H8 16/16; 100% B 5.5!
3H9 8/16; 500a B 5.5' >1'
3H10 4/16; 25% B •6' >1'
4A1 16/16; 100% A. 1' 0.5'
4A2 0/16; 0% N/A 1.5' N/A
4A3 0/16; 0% N/A 2' N/A
4A4 0/16; 0% N/A 31 . N/A
4B1 4/16; 25% A - 3' 0.5'
4B2 0/16; 0% N/A 2' N/A
4B3 0/16; 0% N/A 2' N/A
4B4 3/16; 19%: A 11. 0.5'
4B5 0/16; 0% N/A 3' N/A
4B6
4B7
4C1
4C2
4C3
4C4
4D1
4D2
4D3
4D4
4E1
4E2
4E3
A E4
4F1.
4F2
4F3
4F4.
4G1.
4G2
4G3
4G4
4H1
4H2
4H3
4H4
411
412
413
414
415
41.6
417
4J1
4J2
4J3
4J4
4J5
4J6
4J7
4K1
4K2
4K3
5A1
5A2
5A3
5B1
5B2
5B3
5Cl
5C2
5C3
5D1
0/16; 0%
0/16; 0%
7/16; 44%
0/16; 0%.
0/16; 0%
0/16; 0%.
0/16; 0%
0/16; 0% .
0/16; 0%
1/16; 6.%
0/16; 0%
0/16; P%
0/16; 0%
0/16; 0%
0/16; 0%
0/16; 0%
0/16; 0%
1/16; 6%
1/16; 6%
0/16; 0%
0/16; 0%
0/16; 0%
1/16; 6%
0/16; 0%
0/16; 0%
0/16; 0%
0/16; 0%
0/16; 0%
0/16; 0%
8/16; 50%
0/16; 0%
0/16; 0%
0/16;
.
0%
0/16; 0%
0/16; 0%
0/16; 0%
0/16;
.
0%
0/16; 0%.
0/16; 0%
14/16; 88%
0/16; 0%
0/16; 0 %
0/16; 0%
0/16; 0%.
0/16; 0%
0/16;' 0%
0/16; 0%
.0/16; 0%
0/16; 0%
0%16; 0%
0%16; 0%.
0/16; 0%
0/16; 0%
N/A 3' N/A
N/A .3' N/A
A 0.5'
N/A 2' N/A
N/A 2' N/A
N/A 3' N/A
N/A 3' N/A.
N/A 2' N/A
N/A 2' N/A
A 1' 0.5'
N/A 1' N/A
N/A 2' N/A
N/A 2' N/A
N/A 3' N/A
N/A 3' N/A
N/A 2' N/A
N/A 2' N/A
A 0.5'
A 0.5'
N/A 2' N/A
N/A 2' N/A
N/A .3' N/A
A 1' 0.5'
N/A 2' N/A
N/A 2' N/A
N/A 3' N/A
N/A 2' N/A
N/A 2' N/A
N/A 2' N/A
A 3' 0.5'
N/A 4' N/A
N/A 5! N/A
N/A 5' N/A
N/A 5.' N/A
N/A 4' N/A
N/A 3' N/A
N/A 3' N/A
N/A 2' N/A
N/A N/A
A 0.5'
.N/A N/A
N/A 2' N/A
N/A 2' N/A
N/A 0.5' N/A
N/A 1.5' N/A
N/A 3' N/A
N/A 3' N/A
N/A 1.5' N/A
N/A 0.5' N/A
N/A 0.5' N/A
N/A 1.5' N/A
N/A 3' N/A
N/A 3' N/A
A
5D2 0/16; 0% N/A N/A
5D3 0/16; 0% N/A 0.. 5' N/A.
5E1 0/16; 0% N/A 0. 5' N/A
5E2 .0/16; 0% N/A 1. 5' N/A
5E3 0/16; 0% N/A 3' N/A
5F1 0/16; 0% N/A 3' N/A
5F2 0/16; 0% N/A 1. 5' N/A
5F3 0/16; 0% N/A 0. 5' N/A
5G1 0/16; 0% N/A 0. 5' N/A
5G2 0/16; 0% N/A 1. 51. N/A
5G3 0/16; 0% N/A 3' N/A
Data Set # 1 was located.at the existing US 70 bridge on
Lawson Creek. The entire project area supports lush SAV
beds.`.Sampling was not conducted due to abundance and
density of vegetation;. therefore, the entire impact area will
be considered SAV habitat.
Data Set # 2 includes the mainline and ramps DA and DC on the
south side of the new bridge over the Neuse River. 2A
through 2L include the mainline, 2M through 2Q include ramp
DC, and 2R through 2V include ramp DA.
Note: Plot 2G1 contained an isolated patch of SAV.
Neither the immediate area outside this plot nor
-any other plots in the sample area contained SAV.
Data Set # 3 includes the widening of the existing US .70
bridge over the Trent River..
Data Set # 4 includes ramp-CD and loop.BA.
Data Set # 5 includes the mainline at the Bridgeton
touchdown.
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SITE 2 vi - Q NO SAV PRESENT
SCALE 1:1000
Sample Points without SAV
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SITE 2 R - V SAV PRESENT
SCALE 1:10Qo
Temporary f; Permanent ?sn
Sample Poin.ts with'.SAV N?
Sample Poi
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RAID SITE 3 A - D SAV PRESENT
ACE}' SCALE 1:500
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Sample Points with. SAV
-s- Sample points without SAV I
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FREEDOM MEMORIAL BRIDGE PROP-PAVED SHOULDER
I. %
TYPE woods PROP. G.R.
h R EXIST N . CL 'B' STONE
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EST. 907 . Kg
EST. 4m2 F.F. STAKE
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