20040325 Ver 1_Mitigation Site Visit_20090904

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Table 4. Number and species of benthic macro-invertebrates found at both the mitigation stream at Barra
Farms and the reference stream at Bladen Lakes State Forest.

SPECIES
T.V.**
F.F.G.** Stream
Macro Stream
Micro TOTAL Reference
Macro Reference
Micro TOTAL
kNN'ELEDA 0 0
Oligochaeta 0 0
Haplotaidda 0 0
Tubificidae w.o.h.c. 7.11 CG 0 1 1
THROPODA 0 0
Crustacea 0 0
Copepoda 3 3 1 1
Daphnidae 0 0
Ceriodaphnia sp. 1 1 1 1
Amphipoda 0 0
Crangonyctidae 0 0
Crangonyx sp. 7.87 CG 2 2 4 2 5 7
Isopoda 0 0
Asellidae 0 0
Caecidotea sp. 9.11 CG 31 20 51 2 2
Lirceus sp. 7.85 CG 0 0
Decapoda 0 0
Cambaridae 0 0
Cambarus sp. 7.62 CG 0 0
Hemiptera 0 0
Corixidae 9 PI 6 6 1 1
Gerridae P 0 0
Trepobates sp. P 2 2 0
Notonectidae 0 0
Notonecta sp. 8.71 P 1 1 0
Megaloptera 0 0
Sialidae 0 0
Sialis sp. 7.17 P 0 1 1
Coleoptera 0 0
Dytiscidae *5 P 5 5 3 3
Diptera 0 0
Chironomidae 2 2 2 2
Chironomus sp. 9.63 CG 16 21 37 6 6
Corynoneura sp. 6.01 CG 0 1 1
Phaenopsectra sp. 6.5 Sc 6 3 9 4 1 5
Polypedilum illinoense 9 SH 12 7 19 5 5
Procladius sp. 9.1 P 4 2 6 7 7
Psectrocladius sp. 3.59 SH 17 17 5 2 7
Stenochironomus sp. 6.45 SH 0 1 1
Thienemannimyia sp. 8.42 P 1 1 0
Tribelos sp. 6.31 CG 61 61 35 35
OTAL # OF ORGANISMS 169 56 225 75 11 86
OTAL # OF TAXA 15 7 16 14 6 17
+ Hilsenhoff Tolerance Values used when North Carolina Tolerance Values not available
++ North Carolina Tolerance Values range from 0 for organisms very intolerant of organic wastes to 10 for organisms very tolerant of organic wastes
+++F.F.G.- Functional Feeding Group: SH=Shredder, CG=Collector/Gatherer, FC=Filtering Collector, SC=Scraper, P--Predator, P1=Piercer
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4.0 USE OF MITIGATION CREDITS
4.1 Geographic Service Area: The Geographic Service Area (GSA) is the designated area
wherein a bank can reasonably be expected to provide appropriate compensation for impacts
to similar wetland and/or other stream or aquatic resources. The geomorphic setting of the
Bank includes nonriverine flats, nonriverine depressions, and riverine, first order blackvvater
streams within the Coastal Plain region of the Cape Fear River Basin. The Bank is located in
proximity to, or on the boundary between three hydrophysiographic cataloging units depicted
on the "Hydrologic Unit Map - 1974 State of North Carolina", prepared by the U.S. Geological
Survey. Cataloging units, located within the inner Coastal Plan region of the river basin,
include 03030004, 030:1005, and 03030006 as depicted in Figure 15 of the ".litigation
Plan. These Cataloging Units support similar Coastal Plain natural communities, wetlands,
and drain into the lower Cape Fear River. Therefore, the eastern and western limits of the
service area are defined by the outer boundaries of the Cape Fear River Basin contained vwithin
the above-listed Cataloging Units.
The southern and northern boundaries of these river sub-basins have been modified based
primarily upon 11 digit watersheds in the region. To the south, watersheds in the Wilmington
Area have been excluded due to Karst geomorphology and regional aquifer issues idenrtified
by the MBRT. The MBRT has further restricted the service area north of Wilmington diue to
expected development patterns in the region and the potential for wetland mmpens;atory
mitigation in proximity to these developments. To the north, the service area has been
reduced along 11 digit watershed boundaries to exclude Raleigh Belt portions of the ?Cape
Fear basin (Figure 15 of the Mitigation Plan). The service area is inclusive off the 11 diet. ,
watersheds listed in Table 2.
Use of the Bank for compensatory mitigation may also be considered outside of tE
designated Geographic Service Area if this option is preferable to other mitigation alternativex
It is understood that Geographic Service Area expansion will be considered if the area of tl
Bank is expanded.

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