20151279 Ver 2_Hathaway Annual Monitoring Report (Year 5) 2021_Compiled - r_20230718

2021 (YEAR 5) ANNUAL REPORT
for the
HATHAWAY SWITCHING STATION
STREAM RESTORATION PROJECT
Prepared For
Virginia Electric and Power Company
701 E. Cary Street
Richmond, Virginia 23219
Authorized Agent
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RES
1408 B Roseneath Road
Richmond, Virginia 23230
[phone]
December 2021

Hathaway Switching Station
2021 (Year 5) Annual Report
ATTACHMENTS
The following attachments are included as a part of this narrative for reference:
• Attachment A
—Stream Inspection Photographs
• Attachment B
— Cross Section Data
• Attachment C
— Stream Gauge Data
• Attachment D
— Vegetation Monitoring Datasheets
• Attachment E
— Mitigation Monitoring Map
INTRODUCTION AND SITE DESCRIPTION
December 2021
Page 1 of 5
This annual monitoring report for year 5 (2021) of the Hathaway Switching Station stream
restoration has been prepared by RES on behalf of Dominion Energy. This report has been
prepared consistent with the reporting requirements specified in the Proposed Stream Mitigation
Plan for the Hathaway Switching Station project (DWR # 15-1279 and SAW-2015-01994), and
includes data, analysis, and results obtained from the monitoring of the stream restoration site.
The site is located 0.5 miles south of Battleboro, North Carolina and is owned and operated by
Dominion Energy. The restored stream is in the Upper Tar watershed (03020101). The site is
located east of Hathaway Street and south of Crepe Myrtle Street.
The site contains one stream channel which is an unnamed tributary of Beech Branch. This
tributary trends north to south originating from a culvert under the access road to the Hathaway
Switching Station. At 0.6 miles after exiting the site, the stream drains into Beech Branch. Most
of the site consists of an open, herbaceous dominated, field which includes a young
hardwood/sapling community.
SUMMARY OF SITE INFORMATION, MITIGATION MONITORING, AND MAINTENANCE
ACTIVITIES
The following monitoring and maintenance activities were conducted at the site in 2021:
• Photo documentation of site in spring (April) and fall (September).
• Cross sections, stream habitat evaluation, and vegetation monitoring in the spring (March and
April).
• No maintenance occurred in 2021.
MITIGATION MONITORING
In -Stream Survey and Inspection
Stream channel surveys were conducted along with the collection and analysis of other
quantitative and qualitative data to assess stream stability. In summary, the in -stream evaluation
included a visual assessment of stream conditions within the restoration reach (Attachment A)
and an assessment of stream stability within the restoration reach through an evaluation of cross
sections (Attachment B). Stream gauge data was collected to assess the number of bankfull
events (Attachment C). Finally, vegetation monitoring data was collected to assess the condition
of the riparian buffer (Attachment D). A map of the site has also been provided (Attachment E).

Hathaway Switching Station
2021 (Year 5) Annual Report
PERFORMANCE CRITERIA
December 2021
Page 2 of 5
The following criteria, which are outlined in the Proposed Stream Mitigation Plan, were used to
assess project success for the stream mitigation work. Monitoring of the site shall happen in years
1, 2, 3, 5, and 7; with visual monitoring in years 4 and 6. If all monitoring success criteria are met
by year 5 then monitoring of the site may cease.
In -Stream Restoration
For the 742-linear footage of stream restoration activities, the following success criteria will apply:
Dimension
The analysis of the representative riffle cross section shall indicate that it has neither aggraded,
degraded, widened, nor narrowed to the point where it has become unstable or will cause
instability. The channel is expected to experience some adjustments in geometry as it becomes
in balance with sediment load from the watershed. As a measure of success, the Bank Height
Ratio shall not exceed 1.2 at any riffle cross section.
Profile
In the case that significant changes are observed, a longitudinal profile will be required. This
profile will be compared to the as -built channel.
Stream Habitat Evaluation
The channel shall show progress towards the development of features typical of coastal plain
sand -bed streams. These features include shallow pools, root mats, overhanging vegetation, in -
stream woody debris, and leaf mats. This will be measured through the North Carolina Stream
Assessment Method.
Bankfull Events
The stream restoration shall remain stable through four separate bankfull events occurring in
separate years. This will be measured via a stream gauge established on -site.
Vegetation Monitoring
Woody Vegetation Monitoring
A total of four vegetation monitoring plots shall be established on -site, with two on each side of
the stream channel. The vegetation plots will be 30'x30' and only woody species within the plot
shall be monitored.
The following measurements will be used to aid in making this determination each monitoring
year:
• Woody stem densities will be at least 320 stems/acre at year 3, 260 stems/acre at year 5,
and 210 stems/acre at year 7.
• Planted woody vegetation in each plot must average 7 feet in year 5 and 10 feet in year
10.
• No single species, volunteer or planted, shall comprise more than 50% of any plot in years
3, 5, and 7.
• Species, height, total number, date of planting, and grid location of woody stems shall be
monitored.

Hathaway Switching Station
2021 (Year 5) Annual Report
December 2021
Page 3 of 5
Photographic Documentation
Visual descriptions by way of ground level photographs will occur twice per year, with at least five
months between inspection events. Photos shall be taken at each cross section, each vegetation
plot, and at the upstream and downstream tie-ins.
Adaptive Management
Based on visual inspections of the site, an adaptive management plan will be developed and
implemented in response to any hindrances to long-term success of the site.
RESULTS AND DISCUSSION
In -Stream Restoration
Dimension
Analysis of the cross sections resulted in the following measurements.
Bank Height Ratio
The Bank Height Ratio was determined to be 1.0 for the 2021 monitoring year. This is
within the success criteria range of less than 1.2.
Profile
A longitudinal profile was not measured for the 2021 monitoring year as no significant
changes took place.
Stream Habitat Evaluation
An in -stream structure inspection was conducted during this monitoring period to assess
the establishment of proper coastal plain sand -bed stream habitat. An evaluation using
the North Carolina Stream Assessment Method resulted in a score of 36, similar to the
2018 score and slightly lower than the score in 2019 (36.5). The over-all stream scored
moderate to strong on the development of hydrology, vegetation, and fauna. The in -stream
structures and organic material development had moderate to low scores.
Bankfull Events
Despite experiencing technical difficulties, the stream gauge recorded an additional four
months of stream data between 2019 and 2020. The stream gauge data collected between
November 2018 and January 2020 are included in Attachment C. The performance
requirement for bankful events for the project states, "the stream restoration shall remain
stable through four separate bankfull events occurring in separate years." The data show
a minimum of 24 bankful events occurring in three separate years. The stream is
performing as designed, frequently accessing its floodplain while remaining stable. Since
this performance metric has been successfully met, we would like to request that
stream gauge monitoring be waived for future monitoring reports.
Vegetation Monitoring
Vegetation Monitoring Summary and Findings
Four permanent 30'x30' vegetation sampling plots were assessed within the buffer. Taxonomy
for all sampled vegetation follows Flora of Virginia (Weakley, Ludwig, and Townsend, 2012), as
well as the U. S. Department of Agriculture PLANTS database (USDA, NRCS, 2019). Photographs
of each sample location were taken to document existing conditions. For the locations of the
vegetation sampling plots, refer to the Mitigation Monitoring Map (Attachment E). For the

Hathaway Switching Station December 2021
2021 (Year 5) Annual Report Page 4 of 5
vegetation sampling results and accompanying photographs, refer to The Vegetation Monitoring
Datasheets (Attachment D).
A summary of the woody monitoring results for 2021 is presented in Table 1 below.
Table 1. Summary of woody vegetation monitoring for 2021
Hathaway Switching
Station
2021
Plot #
Planted Canopy Size Classes (ft)
Volunteer Canopy Size Classes (ft)
Plot
Stems/Acre
0-2
2-4
4-6
6-8
8+
0-2
2-4
4-6
6-8
8+
1
1
0
0
0
0
14
1
0
0
0
774.4
2
1
3
2
3
12
3
4
6
0
0
1645.6
3
2
0
4
2
10
20
0
2
1
1
2032.8
4
0
1
1
1
5
6
5
0
0
0
919.6
Stem Count
4
4
7
6
27
43
10
8
1
1
Percentage (%)
8.3
8.3
14.6
12.5
56.3
68.3
15.9
12.7
1.6
1.6
Average # of Stems
1
1
2
2
7
11
3
2
0
0
Average Height (ft)
7.00
2.05
Total Stem Count
48
63
Total Stems/Acre
580.80
762.30
As shown in Table 1, all four plots are surpassing the stem density requirement for year 5 of 260
stems per acre. Tree heights across the plots averaged 7.00 feet for planted trees (an increase
from 6.29 feet in 2019). Plots 2, 3, and 4 achieved the minimum average height measurement of
7 feet. The most common planted trees in the plots were red maple (Acer rubrum), swamp
cottonwood (Populus heterophylla), and black willow (Salix nigra). A majority of the volunteer
species consisted of red maple (Acerrubrum) and loblolly pine (Pinus taeda).
Plot 1 vegetation growth continues to suffer and is failing to meet success criteria for height and
diversity measurements. Average woody stem height is below the 7-foot minimum. In addition,
one species currently composes more than 50% of the stems with Ioblolly pine (Pinus taeda)
accounting for 11 of the 16 woody stems. The lack of species diversity and growth is attributed to
herbicide use which occurred in 2019 in the northernmost section of the stream buffer, including
Plot 1. Supplemental planting of 89 additional shrubs in April 2020 resulted in poor survivability of
planted stems along the stream bank and stream buffer. Despite the limited woody growth within
Plot 1, the area is stable and has thick herbaceous growth as you can see from the site
photographs in Appendix A.
Adaptive Management 2021
Due to the establishment of a new overhead powerline ROW with restrictions on woody species
above 5', RES recommends shifting vegetation Plot 1 about 15 feet downstream to better
reflect the stream bank and buffer vegetation growth along the majority of the project. This new
ROW is located at the northern end of the project (shown in the monitoring map in attachment E).
SUMMARY
Based upon the monitoring results for the 2021 monitoring year, the Hathaway Switching Station
Stream Restoration is functioning as intended. The cross sections, documented vegetation lining

Hathaway Switching Station
2021 (Year 5) Annual Report
December 2021
Page 5 of 5
the sides of the channel, and the habitat evaluation found the stream to be developing habitat
common to coastal plain streams. Overall, woody vegetation is healthy and well above the stems
per acre requirement. Several woody volunteers were also found within the plots, indicating a
good seed source upstream of the restored stream.

Hathaway Switching Station
2021 (Year 5) Annual Report
REFERENCES
December 2021
Page 6 of 5
USDA, NRCS. 2008. The PLANTS Database (http://plants.usda.gov, February 25,2020).
National Plant Data Center, Baton Rouge, LA 70874-4490 USA.
Department of Conservation & Recreation (VDCR). September 2009. Virginia Department of
Conservation and Recreation's Invasive Alien Plant List. Division of Natural Heritage,
Richmond, Virginia 23219.
Pfankuch, D.J., 1975. Stream Reach Inventory and Channel Stability Evaluation. USDA Forest
Service, Missoula, Montana.
Virginia Department of Environmental Quality (VA-DEQ). August 2008. Biological Monitoring
Program Assurance Project plan for Wadeable Streams and Rivers. Division of Water
Quality, Richmond, Virginia 23219.
Weakley, A.S., Ludwig J.C., and Townsend, J.F. 2012. Flora of Virginia. Fort Worth, TX:
Botanical Research Institute of Texas Press.

Attachment A
Stream Inspection Photographs

STREAM INSPECTION PHOTOGRAPHS
Hathaway Switching Station
Spring 2021
PHOTO 1-1: Upstream view of the above site tie-in.
No Photo Available
PHOTO 1-2: Downstream view above cross section 1.
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STREAM INSPECTION PHOTOGRAPHS
Hathaway Switching Station
Spring 2021
PHOTO 2-1: Upstream view at cross section 1.
PHOTO 2-2: Downstream view at cross section 1.
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STREAM INSPECTION PHOTOGRAPHS
Hathaway Switching Station
Spring 2021
PHOTO 6-1: Upstream view at cross section 2.
PHOTO 6-2: Downstream view at cross section 2.
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STREAM INSPECTION PHOTOGRAPHS
Hathaway Switching Station
Spring 2021
PHOTO 7-1: Upstream view at bottom of restored stream.
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PHOTO 7-2: Downstream view at below site tie-in.
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STREAM INSPECTION PHOTOGRAPHS
Hathaway Switching Station
Spring 2021
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PHOTO 7-1: Rip rap channel from corner of the substation.
PHOTO 7-2: Looking downstream and perpendicular to Rip Rap channel.
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STREAM INSPECTION PHOTOGRAPHS
Hathaway Switching Station
Fall 2021
PHOTO 1-1: Upstream view of the above site tie-in.
PHOTO 1-2: Downstream view above cross section 1.
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PHOTO 2-1: Upstream view at cross section 1.
PHOTO 2-2: Downstream view at cross section 1.
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STREAM INSPECTION PHOTOGRAPHS
Hathaway Switching Station
Fall 2021
PHOTO 6-1: Upstream view at cross section 2.
PHOTO 6-2: Downstream view at cross section 2.
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Attachment B
Cross Section Data

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Stream Gauge Data

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Vegetation Monitoring Datasheets

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Attachment E
Mitigation Monitoring Map

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