HomeMy WebLinkAboutOnslow Br. 134 over Gibson Branch Temporary Impact Site - Year 2 ReportANNUAL REPORT FOR 2021
Onslow Br. No. 134 Temporary Impact Site
Onslow County
WBS #: 17BP.3.R.48
COE Action ID: SAW-2017-02381
DWR Project #: 20171428
Prepared By:
Roadside Environmental Unit and Environmental Analysis Unit
North Carolina Department of Transportation
August 2021
TABLE OF CONTENTS
SUMMARY ........................................................................................................... 1
1.0 Introduction ............................................................................................... 2
.1 Project Description ......................................................................... 2
.2 Purpose ......................................................................................... 2
.3 Project History ................................................................................ 2
.4 Debit Ledger .................................................................................... 2
2.0 Vegetation: ................................................................................................ 3
.1 Success Criteria ............................................................................. 3
.2 Description of Species ..................................................................... 3
.3 Results of Vegetation Monitoring .................................................... 3
.4 Conclusions. ................................................................................... 4
3.0 Overall Conclusions and Recommendations ............................................. 4
FIGURES
Figure 1 – Vicinity Map ........................................................................................ 5
APPENDICES
Appendix A – Site Photos and Site Map
1
SUMMARY
The Onslow Br. No. 134 Temporary Impact Site is located in Onslow County. This is an
annual report for temporary impacts associated with the bridge replacement of Bridge
No. 134 over Gibson Branch on White Oak Road. The temporary impact site was
planted in January 2020.
The temporary impacts encompass approximately 0.11 acres. The area that was
impacted is being monitored to ensure that it re-attains wetland jurisdictional status.
Hydrologic monitoring is not required for this site; however, vegetation monitoring is
required for three years.
A supplemental planting was completed in November 2020 with Baldcypress and Water
Tupelo being planted. After the second year of monitoring, the Onslow Br. No. 134
Temporary Impact shows by visual observation that the temporarily impacted area is re-
attaining jurisdictional wetland status. The planted tree species were surviving
throughout the site.
NCDOT proposes to continue vegetation monitoring at the Onslow Br. No. 134
Temporary Impact Site in 2022.
2
1.0 INTRODUCTION
1.1 Project Description
The Onslow Br. No. 134 Temporary Impact Site is located in Onslow County at Bridge
No. 134 over Gibson Branch on White Oak River Road (Figure 1). The temporary
impacts encompass approximately 0.11 acres. The area that was impacted is being
monitored to ensure that it re-attains jurisdictional wetland status. Hydrologic
monitoring is not required for this site, however, vegetation monitoring is required for
three years.
1.2 Purpose
In order for a temporary impact site to be considered successful, a site must meet
vegetation success criteria. This report details the vegetation monitoring in 2021 at the
Onslow Br. No. 134 Temporary Impact Site. Hydrologic monitoring was not required for
the site.
1.3 Project History
January 2020 Wetland Reforestation Completed
October 2020 Vegetation Monitoring (Year 1)
November 2020 Supplemental Planting Completed
June 2021 Vegetation Monitoring (Year 2)
1.4 Debit Ledger
The restoration of the Onslow Br. No. 134 Temporary Impact Site was used entirely to
compensate for temporary impacts on the Onslow Br. No. 134 project. There were no
wetland mitigation credits generated from the restoration of the impacted area.
3
2.0 VEGETATION: ONSLOW BR. NO. 134 TEMPORARY IMPACT SITE
(YEAR 2 MONITORING)
2.1 Success Criteria
ONSLOW BRIDGE NO. 134 TEMPORARY DETOUR RESTORATION PLAN
Monitoring of the restoration area will consist of visual/photograph annual reporting for a
minimum of three years following planting. Following the third year of monitoring,
NCDOT and Regulatory agencies will meet on-site to determine if the site temporarily
impacted has retained jurisdictional status with planted and native species. If the site
has not re-attained wetland jurisdictional status, NCDOT and the US Army Corps of
Engineers will determine whether compensatory wetland mitigation will be required.
2.2 Description of Species
The following wetland species were planted in the temporary impact areas:
Quercus michauxii, Swamp Chestnut Oak
Nyssa sylvatica, Blackgum
Betula nigra, River Birch
Taxodium distichum, Baldcypress
Nyssa aquatica, Water Tupelo
2.3 Results of Vegetation Monitoring
The impacted area where the temporary impacts occurred is re-attaining wetland
jurisdictional status. River Birch, Swamp Chestnut Oak, Baldcypress, and Water Tupelo
were noted surviving throughout the site. Site was inundated with approximately 3 in. of
water at the time of monitoring. Other species noted within the temporary impacted
area included smartweed, stinkweed, sedge, woolgrass, fennel, red maple, black willow,
sweetgum, and various grasses.
4
2.4 Conclusions
There were approximately 0.11 acres of temporary impacts. There were no plots
established on the site. By visual observation, the Onslow Br. No. 134 Temporary
Impact Site is re-attaining wetland jurisdictional status.
3.0 OVERALL CONCLUSIONS AND RECOMMENDATIONS
NCDOT proposes to continue vegetation monitoring at the Onslow Br. No. 134
Temporary Impact Site in 2022.
5 Figure 1. Vicinity Map
APPENDIX A
SITE PHOTOS & SITE MAP
Onslow Br. No. 134 Temporary Impact Site
Photo 1