20081317 Ver 1_Year 3 Monitoring Report_20130503

PotashCorp®
Helping Nature: Provide
Federal Express
May 1, 2013
Mr. Tom Steffens
U.S. Army Corps of Engineers
Washington Regulatory Field Office
2407 West 5h Street
Washington, North Carolina 27889
Dear Mr. Steffens:
PotashCorp - Aurora
Enclosed is the "Third Annual (2012) Report for the Hell Swamp /Scott Creek Watershed
Mitigation Site, Pantego Township, Beaufort County, North Carolina ". Earthwork was initiated
on the mitigation site in July 2009 and planting was complete in May 2010. Minor additional
earthwork was done in September 2010. A CD containing the report, all of the hydrology graphs
from the monitoring wells, and photos and video depicting stream flow is also included. If you
have any questions, please call me at (252) 322 -8249, or Julia Berger of CZR Incorporated at
(910) 392 -9253.
Sincerely,
2�c,M�
ey J . Furness
Senior Scientist
PC: Karen Higgins, DWQ- Raleigh w /encl.
Amy Adams, DWQ —
Wash. w/ encl.
R.M. Smith
w /Summary
M. Brom
w /Summary
J. Hudgens, CZR
w /encl.
J. Ricketts, JTR
w /encl.
D. Huneycutt, Baker
w /encl.
S. Cooper, CZR
w /encl.
J. Berger, CZR
w/o encl.
23 -11 -019
w /cncl.
1530 NC Hwy 306 South, Aurora, NC USA 27806 T (252) 322 -4111
PotashCorp. I www.potastKorp.com

08 -1311
- THIRD ANNUAL (2012) REPORT FOR THE
HELL SWAMP /SCOTT CREEK WATERSHED MITIGATION SITE
PANTEGO TOWNSHIP
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Prepared for:
PCS Phosphate Company, Inc.
Prepared by:
CZR Incorporated
April 2013
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THIRD ANNUAL (2012) REPORT FOR THE
HELL SWAMP /SCOTT CREEK WATERSHED MITIGATION SITE
PANTEGO TOWNSHIP
BEAUFORT COUNTY, NORTH CAROLINA
Prepared for:
PCS Phosphate Company, Inc.
Prepared by:
CZR Incorporated
April 2013

THIRD ANNUAL (2012) REPORT FOR THE
HELL SWAMP /SCOTT CREEK WATERSHED MITIGATION SITE
PANTEGO TOWNSHIP
BEAUFORT COUNTY, NORTH CAROLINA
Prepared for:
PCS Phosphate Company, Inc.
Prepared by:
CZR Incorporated
April 2013

TABLE OF CONTENTS
1.0 PROJECT OVERVIEW ..........................
1.1 History ........ ...............................
1.2 Location ...... ...............................
1.3 Goals and Performance Criteria
2.0 REQUIREMENTS
2.1 Normal Rainfall and Growing Season ...........................
2.2 Hydrology ....................................... ...............................
2.3 Vegetation ...................................... ...............................
2.4 Hydrogeomorphic Monitoring of Streams and Valleys..
2.5 Photographic Documentation ......... ...............................
3.0 SUMMARY DATA
3.1 Rainfall ................................................................... ...............................
3.2 Hydrology ............................................................... ...............................
3.2.1 QA/QC of Well Performance ............................... ...............................
3.2.2 Geomorphic Monitoring, Flow Events and Annual Stream Surveys. .
3.2.3 Hydroperiods ....................................................... ...............................
3.2.3.1 Riparian Headwater Systems / Bottomlands . ...............................
3.2.3.2 Non - riparian Hardwood Flat ......................... ...............................
3.2.4 Hydroperiod Comparison to Control Forests ....... ...............................
3.2.4.1 Plum's Pit .................................................... ...............................
3.2.4.2 Windley ........................................................ ...............................
3.2.4.3 Winfield ........................................................ ...............................
3.3 Vegetation .............................................................. ...............................
3.3.1 Riparian Buffer ..................................................... ...............................
3.3.2 Riparian Areas / Bottomlands ................................ ...............................
3.3.3 Non - riparian Hardwood Flat ................................ ...............................
3.5 Photographic Documentation ................................. ...............................
4.0 SUMMARY
LITERATURE CITED
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Cover Photo: Aerial photos 15 February 2012 and 14 August 2012. View to the west, Seed
Tick Neck Road to upper right and right edge of photos.
Hell Swamp /Scott Creek Mitigation Site ii PCS Phosphate Company, Inc.
Third Annual Report April 2013

LIST OF TABLES
Table 1
Performance criteria, methods summary, and current status ...... ...............................
T -1
Table 2A
Longest hydroperiods in 2012 of 92 riparian monitoring wells at Hell Swamp
restorationsite ............................................................................. ...............................
T -4
Table 2B
Longest hydroperiods in 2012 of 111 non - riparian hardwood flat monitoring
wells at Hell Swamp restoration site and 14 nearby control wells during all
rainfallconditions ....................................................................... ...............................
T -11
Table 3A
Longest hydroperiods in 2012 of 92 riparian monitoring wells at Hell Swamp
restoration site during normal or below normal rainfall .............. ...............................
T -27
Table 3B
Longest hydroperiods in 2012 of 111 non - riparian hardwood flat monitoring
wells at Hell Swamp restoration site and 14 nearby control wells during normal
or below normal rainfall .............................................................. ...............................
T -34
Table 4
Summary of 2012 flow gauge data and visual observations from upper Scott
Creek and its headwater systems (UT1 — UT7) and a tributary to Smith Creek
(UT8) at Hell Swamp ................................................................. ...............................
T -47
Table 5
Survival of trees and shrubs planted in 19 0.017 -acre plots in potential riparian
buffer areas at Hell Swamp from baseline (summer 2010) to fall 2012 ...................
T -48
Table 6
Survival of trees and shrubs planted in 12 riparian 0.22 -acre plots at Hell
Swamp from baseline (summer 2010) to fall 2012 .................... ...............................
T -50
Table 7
Survival of trees and shrubs planted in 111 non - riparian 0.22 -acre plots at Hell
Swamp from baseline (summer 2010) to fall 2012 .................... ...............................
T -51
LIST OF FIGURES
Figure 1 Hell Swamp Vicinity Map
Figure 2 Hell Swamp Monitoring Locations
Figure 3 Hell Swamp Mitigation Site Monitoring Locations on Soil Survey
Figure 4A Hell Swamp Restoration Area Well Locations on As Built LiDAR
Figure 4B Hell Swamp Control Forest Well Locations on Pre - restoration LiDAR
Figure 5 2012 Hell Swamp and WETS - Belhaven Rainfall
Figure 6 Hell Swamp Mitigation Site Monitoring Wells -2012 Hydroperiods and
Hydrologic Zones
Figure 7 Hell Swamp Mitigation Site Monitoring Wells -2012 Hydroperiods
Hydrologic Zones During Normal Rainfall
Figure 8 Hell Swamp Mitigation Site 2012 Nuisance Plot Summary Results
APPENDICES
Estimated
and Estimated
A 2012 Hydrogeomorphic Stream Surveys and Cross Section Measurements
B 2012 Flow Events Recorded by Low Flow Gauges, Observer Data, and Stream
Survey Results in Each Tributary or Headwater System
C Baseline and 2012 Stem Counts at Individual Plots at Hell Swamp
D Selected Third Annual (2012) Restoration Vegetation Photographs
Hell Swamp /Scott Creek Mitigation Site iii PCS Phosphate Company, Inc.
Third Annual Report April 2013

1.0 PROJECT OVERVIEW
1.1 History. The 1,297 -acre Hell Swamp /Scott Creek Watershed mitigation site is a
significant component of the compensatory mitigation for future unavoidable impacts to wetlands
and waters as authorized by Section 404 Permit Action ID 200110096 and the Section 401 Water
Quality Certification DWQ #2008 -0868, version 2.0. Hydrogeomorphic monitoring of the stream
valleys is conducted by Baker Engineering. CZR Incorporated (CZR) of Wilmington, NC monitors
hydrology and vegetation of the Hell Swamp site, as well as three other nearby sites (Windley,
Plum's Pit, and Winfield) used as hydrological controls. Restoration activities at Hell Swamp
were authorized by the NC Division of Coastal Management and Coastal Area Management Act
(CAMA) major development permit 83 -09 as well as the NC Division of Land Resources Erosion
and Sediment Control Permits, which were issued for 11 separate phases and further described
in the As Built Report (CZR 2010) and the Baseline and First Annual Report (CZR 2011). Work
occurred from 1 July 2009 until 22 June 2010 and began in areas not subject to CAMA or Section
404 jurisdiction. Planting occurred from February to May 2010, after each phase of restoration
earthwork was completed; planted species and densities are described in CZR 2010.
1.2 Location. The Hell Swamp site is located within the Pamlico Hydrologic Unit
03020104 of the Tar - Pamlico river basin within the Pungo Creek subbasin and is drained by Scott
Creek, Smith Creek, and Broad Creek. The site encompasses almost the entire Scott Creek
watershed and a portion of the watersheds of Smith Creek and Broad Creek. Located on the
southwest side of Seed Tick Neck Road (SR 1714) in Beaufort County, the site is approximately
two miles east - southeast (straight -line distance) of the town of Yeatesville, Pantego Township,
North Carolina (Figure 1).
1.3 Goals and Performance Criteria. The primary goal of the project is to restore a
self- sustaining functional watershed and wetland /stream complex to allow surface flow to move
through vegetated wetlands before reaching any stream. Mitigation yields are estimated and
performance criteria are described for the project in detail in the Compensatory Mitigation Plan for
Restoration of Hell Swamp /Scott Creek Watershed (CZR 2009). Performance criteria and current
status are summarized in Table 1. Over time the Hell Swamp site is expected to successfully:
re- establish approximately:
• 19,783 linear feet (LF) of zero and first -order stream, including the
restoration of six riparian headwater systems and three low energy
streams;
• 21 acres of Tar - Pamlico riparian buffer, with additional potential buffer
opportunity if suitable stream segments form in the riparian headwater
systems;
• 58 acres of riparian forested hardwood wetland (headwater forest,
bottomland hardwood forest and riverine swamp forest), with some
additional enhancement potential; and
• 808 acres of non - riverine hardwood flat; and
preserve or rehabilitate:
• 40 acres of non - riverine hardwood flat including a 34 -acre "state or
regionally significant" mature hardwood flat;
• 28 acres of riverine swamp forest / bottomland hardwood forest;
• 18 acres of non - riverine hardwood flat; and
• 200 acres of areas mapped as uplands on the county soil survey.
Hell Swamp /Scott Creek Mitigation Site 1 PCS Phosphate Company, Inc.
Third Annual Report April 2013

An additional 103 acres underlain by hydric soils are included as "potential non - wetland"
areas due to drainage effects from perimeter ditches that must remain open. Approximately 34
acres at the head of the watershed is mature non - riverine wet hardwood forest underlain by Cape
Fear soil (the Windley tract) and will be preserved to help mitigate for permitted mine impacts to
the Bonnerton non - riverine wet hardwood area. The Plum's Pit tract (Arapahoe soil, hardwood
forested wetland) and the Winfield tract (Augusta, Tomotley, and Roanoke soils) are other nearby
hardwood forested wetlands at similar elevations to portions of Hell Swamp and underlain by soil
series mapped on Hell Swamp as shown on the Beaufort County Soil Survey (Kirby 1995). All
three tracts will be monitored as hydrologic controls for the restored hydrology of applicable areas
at the Hell Swamp site (Figure 1).
2.0 REQUIREMENTS
2.1 Normal Rainfall and Growing Season. An onsite continuous electronic rain
gauge is downloaded once a month and its data are used in conjunction with data from nearby
automated weather stations (e.g., NRCS WETS data from NOAA's site at Belhaven and NOAA's
Aurora site to fill Belhaven data gaps) to determine normal rainfall during the monitoring period.
Hell Swamp data were compared to the WETS range of normal precipitation to determine if Hell
Swamp rainfall was within the normal range. The range of normal precipitation for this report
refers to the 30th and 70th percentile thresholds of the probability of having onsite rainfall amounts
less than or higher than those thresholds. The range of normal and the 30 -day rolling total data
lines begin on the last day of each month and the 2012 WETS - Belhaven monthly precipitation
total is plotted on the last day of each month.
Under the 2010 regional guidance from the Corps of Engineers for wetland hydroperiods,
the normal growing season for Beaufort County is 28 February to 6 December or 282 days (283
days in 2012 due to leap year, WETS table for Beaufort County first/last freeze date 28 degrees F
50 percent probability) (US Army Corps of Engineers 2010). At the suggestion of the Corps'
Washington regulatory field office, data collected between 1 February and 28 February provide
important information related to analyses of site hydrology during the early growing season, but
are not part of the hydroperiod calculation for success.
2.2 Hydrology. Figure 2 depicts the locations of hydrology monitoring equipment. All
well locations are also depicted on the Beaufort County Soil Survey sheet 9 (Figure 3) and on
LiDAR (Figures 4A and 4B). To document surface storage, hydrology in the restored riparian
headwater system, and hydroperiods of all wetland types on the site, 111 semi - continuous
electronic Ecotone water level monitoring wells (manufactured by Remote Data Systems, Inc. or
RDS) are deployed at a density of approximately 1 well /10 acres in the non - riparian wetland flat
areas. An additional 12 wells within the expected riparian zone and 80 wells in 40 arrays across
the stream valleys measure the hydrology of the riparian stream system and bottomlands (92
riparian wells). Forty (40) gauges (beta models) to record low flow events were also installed
either within or near each of these stream arrays in early 2011. Each stream valley array consists
of a well on either side of the perceived valley and a flow gauge in the valley where flow has been
evident or seems likely based on the topography of the valley and surrounding area. The arrays
are approximately 500 feet apart (along the long axis) for each valley (at least 3 arrays per 1,000 -
foot reach; upstream, center, downstream). The low flow gauges are programmed to take 72
readings per day and the units are downloaded once a month. For most gauges, a minimum flow
threshold of 0.5 gal /min is used when the data are analyzed and flow events are tallied.
Observations during downloads and stream surveys, rainfall, and geomorphic position are also
part of the analysis and interpretation of the flow gauge data.
At the longest monitored control site ( Windley tract), three electronic wells, each paired
with a manual well, have been monitored since March 2007. Four electronic wells have been
monitored in Plum's Pit since October 2010 and seven electronic wells have been monitored in
the Winfield tract since July 2011 (Figures 3 and 4).
Hell Swamp /Scott Creek Mitigation Site 2 PCS Phosphate Company, Inc.
Third Annual Report April 2013

Electronic wells are downloaded once a month and the data (readings every 1.5 hours)
evaluated on an annual basis to document wetland hydroperiods. Wetland hydroperiods are
calculated by counting consecutive days with water level at least 12 inches below the soil surface
during the growing season under normal or below normal rainfall conditions. Data from the
Windley, Plum's Pit, and Winfield sites are used to compare to hydrology at applicable areas at
Hell Swamp. Because of differences in maturity and disturbance characteristics of the mitigation
site, these data will not be used for strict success or performance parameters, only to confirm
local /regional hydrological response to precipitation. Flow gauges are also downloaded once a
month and visual observations of flow conditions at the valley array are recorded and the data
used to calculate duration and frequency of flow events. No control site for the flow parameter
has been identified.
2.3 Vegetation. The third annual survey of the 123 0.22 -acre planted tree and shrub
monitoring plots occurred in October and November 2012 and represents a two percent sample
of the restoration area (Figure 2). Smaller (0.017 -acre) planted tree and shrub monitoring plots
were also surveyed at 19 stream arrays to provide an estimate of stem density in the potential
riparian buffer areas. Monitoring for three nuisance species [red maple (Acer rubrum), sweet
gum (Liquidambar styraciflua), and loblolly pine (Pinus taeda)] occurred in 2011 for the first time
and was also conducted in 2012.
2.4 Hydrogeomorphic Monitoring of Streams and Valleys. The main channel that
flows through the site is named Scott Creek from its headwaters to the downstream extent of the
property at NC Route 99, where the creek flows through a road culvert and eventually discharges
to Pungo Creek, a tributary to the Pungo River. For this report, the main channel is divided into
Upper Scott Creek (USC), which contains the constructed single thread channel and the zero
order valley upstream, and Lower Scott Creek (LSC). Several headwater tributaries (UT1 — UT8)
were identified, using Lidar, historical aerials and knowledge of the site, which would have
historically drained to Scott Creek or Smith Creek (Figures 2 and 3). Two cross sections in the
Scott Creek single thread channel stream segment are measured annually during the monitoring
period; the other tributaries are measured in the third (2012) and fifth (2015) monitoring years.
2.5 Photographic Documentation. Twenty (20) permanent photo point locations
were established at random well locations and five were established along the perimeter of the
restoration area (Figure 2). Photographs were taken in the four cardinal directions as well as an
additional direction to capture as much of the vegetation plot as possible unless it was already
captured in the other four photos. Photographs at the fixed -point stations were taken in July
2010 (baseline) and each subsequent fall during the monitoring period; third annual photographs
were taken in November 2012.
3.0 SUMMARY DATA
3.1 Rainfall. Total rainfall recorded at the Hell Swamp rain gauge for 2012 was
60.75 inches and total rainfall recorded at the nearby PCS Duck Creek monitoring site was 52.79
inches. The WETS 30 -year range of normal data shown on Figure 5 is derived from the latest
available data set and comprises the years 1971 -2000. The 30 -day rolling total of Hell Swamp
2012 rainfall was considered within WETS normal range except for June and September, when
the amounts were above normal range (Figure 5). Hydroperiods were calculated for the entire
growing season without regards to normality of rainfall and were also calculated for the longest
consecutive hydroperiod within the growing season during normal (and below normal) rainfall
only, excluding June and September.
The US Drought Monitor (http: / /droughtmonitor.unl.edu) provides a synthesis of multiple
indices and impacts and reflects the consensus of federal and academic scientists on regional
conditions on a weekly basis (updated each Thursday). Using an area - weighted average, North
Carolina's Beaufort County experienced 15 weeks in the 2012 growing season with drought
status. Of those 15 weeks, five consecutive weeks were classified as a moderate drought in the
Hell Swamp /Scott Creek Mitigation Site 3 PCS Phosphate Company, Inc.
Third Annual Report April 2013

early growing season between February and May, and eight consecutive weeks were classified
abnormally dry. Later in the growing season, during October, two consecutive weeks were also
classified as abnormally dry. In total, during the 41 -week long growing season, 26 weeks were
classified as without any drought status, or normal.
3.2 Hydrology. The second full year of post- restoration hydrology data for the entire
site was 2012 because construction activities prevented all wells from being installed at the start
of the 2010 growing season. However, wells were installed as soon as construction in an area
was complete, so data were collected during a large portion of the 2010 growing season over
most of the site. Tables and graphs depicting 2012 daily well readings and rainfall are included
on a companion CD to this report.
3.2.1 QA/QC of Well Performance. In 2011, approximately one third of the
Hell Swamp wells were tested for performance according to monitoring requirements. The testing
was described in the second annual (2011) monitoring report (CZR 2012). A second third of the
wells will be tested in 2013.
3.2.2 Geomorphic Monitoring, Flow Events and Annual Stream Surveys. Two
cross sections (7 and 8) in the single thread channel of upper Scott Creek were established at
baseline and are measured annually. The third annual measurement of those two cross sections,
as well as seven additional cross sections, occurred in December 2012 and no areas of concern
were identified. Appendix A contains the complete Baker geomorphic report, which includes a
figure showing the location of all cross sections and the profiles of each cross section measured
in 2012. Each cross section exhibited minor differences from as -built conditions, but those
differences are expected in newly constructed restoration sites. The channel and floodplain
changes observed along the cross sections are attributed to flood deposition, soil settling,
maturing vegetation, and slight differences in survey rod point locations.
Data from the low flow gauges indicate flow occurred at most locations at some
point during the year. In some cases, a particular gauge may not have recorded a flow event, but
the gauge just upstream or downstream of the gauge recorded multiple events. Gauges were
initially deployed at locations where stream characteristics were anticipated and appeared to be
forming. As the system develops, monitoring at some locations may be discontinued or units may
be moved to other locations in the future; however, as of December 2012, all flow gauges were in
their original locations. Many of the low flow gauges display erratic data that are difficult to
interpret with confidence, especially in ponded and /or vegetated areas of valleys or channels.
Therefore flow gauge data are considered supplemental information used in conjunction with
rainfall data and visual confirmations. A summary of flow events and the number of calendar
days with flow for each gauge is shown in Table 4. Tables for each gauge show number and
approximate duration and a summary table of observations made during regular monthly
monitoring visits are included in Appendix B. Photographs and video of flow taken during monthly
site visits are included on the companion CD to this report.
The first stream survey occurred 27 January 2011 when each headwater valley
was walked to determine the locations for installation of the low flow gauges. In some instances,
the location of the flow gauge was selected slightly upstream or downstream from a given well
array depending on conditions. During the January survey, flow of varying amounts and depths
was noted in almost all the valleys and at almost every gauge location. A second stream survey
was conducted at the end of the year (30 November — 1 December 2011). Active flow was
occurring during the second stream survey at UT8 and Lower Scott Creek, but was not
discernible in other valleys, although water was present. However, evidence of past flow events
was noted during the second stream survey in UT3, UT6, UT7, UT8, and Upper Scott Creek
(sorting, deposition, shallow channel features, debris /wrack, and braids or meanders). Refer to
Appendix B of the second annual report (CZR 2012) for a summary of the two surveys, selected
photos, and map of documented stream features.
Hell Swamp /Scott Creek Mitigation Site 4 PCS Phosphate Company, Inc.
Third Annual Report April 2013

The third and fourth stream surveys occurred 27 June and 11 and 13 December
2012 and the findings are described in Appendix B, which also contains photos taken during the
surveys. Also, video of flow from the December survey at various locations is included on the
companion CD to this report. All the headwater valleys at Hell Swamp were walked from the
downstream end to the upper reaches to document active flow with video (if possible), or
evidence of past flow with photographs and GPS data. Active low flow in various water depths
was observed in Lower Scott Creek and portions of Upper Scott Creek (single thread and above)
in both the June and December surveys. During the June survey, no active flow or water was
observed in any of the unnamed tributaries and no video was taken of Lower or Upper Scott
Creek, as flow was of low velocity and would not be easily seen in a video. The winter survey
occurred over two days in December with nearly one and a half inches of rainfall occurring
between the two days. The 11 December 2012 survey day was much like the June survey with
the exception of flow video recorded in Lower Scott Creek near the mouth of UT6 (Videos 1 and
2). There were no other observations of active flow or water in any of the other unnamed
tributaries on that day except UT6. After the 12 December rain event, the stream crossing
between Lower Scott Creek and Upper Scott Creek was revisited on 13 December 2012 and
active flow video was recorded (Video 3). Several videos of active flow were also recorded for
UT8 and are referenced in Appendix B.
In addition to active flow, physical features noted during stream surveys in 2012
included bed and bank, sediment transport and /or scour, sediment sorting, debris wrack, and
matted vegetation parallel to downstream flow. Until the planted trees and shrubs reach enough
height to shade the valleys, development of dense herbaceous vegetation will continue to occur
in many areas. This herbaceous layer can attenuate flow events and reduce velocity below the
point of scour and can also obscure other incipient channel formation features.
3.2.3 Hydroperiods. The majority of all wells exhibited wetland hydroperiods
regardless of rainfall conditions in 2012 (Tables 2A and 2B, Figure 6) and more wells had wetland
hydroperiods than in 2011. Many wells had several wetland hydroperiods throughout the year.
After excluding well data during above the range of WETS normal rainfall (June and September),
most wells still exhibited wetland hydroperiods (Tables 3A and 3B, Figure 7). However, many of
the longest hydroperiods were reduced (or eliminated and the next longest hydroperiods was
used) but only some dropped down to the next hydrologic zone. Rehydration of the site will likely
continue as the site equilibrates to its new hydrology. The reported hydroperiods at three
locations were possibly shortened by well malfunctions. Other wells experienced well
malfunctions, but for shorter periods and /or outside of the growing season and therefore did not
affect hydroperiod calculations. The monthly tables depicting 2012 daily noon readings and
rainfall included on the companion CD to this report show those gaps.
3.2.3.1 Riparian Headwater Systems/Bottomlands. In 2012, most of the
riparian wells (63 out of 92) exhibited a wetland hydroperiod greater than 12.5 percent of the
growing season regardless of rainfall conditions (Table 2A, Figure 6), which is 14 more wells than
last year, and four had a wetland hydroperiod for the entire growing season. When counting
cumulative days during the growing season, all but seven wells recorded cumulative hydroperiods
totaling to 12.5 percent or greater. Those seven wells did not exhibit a wetland hydroperiod
greater than 6 percent, which may be due to microtopography or to the well being located slightly
upslope of the riparian valley edge, or to drawdown by the adjacent stream hydrology. All but
four of the riparian wells also measured water tables shallower than -12 inches between 1
February and 27 February (Table 2A).
When excluding well data during above WETS normal rainfall periods
(June and September), the length of 35 of the longest hydroperiods was shorter by 1 -50 percent.
However, only 13 hydroperiods decreased enough to move to a lower hydrologic zone. One less
well recorded a wetland hydroperiod. Most wells still exhibited wetland hydroperiods greater than
12.5 percent of the growing season, but the number dropped to 55 out of 92.
Hell Swamp /Scott Creek Mitigation Site 5 PCS Phosphate Company, Inc.
Third Annual Report April 2013

3.2.3.2 Non - riparian Hardwood Flat. Most of the 111 non - riparian wells
exhibited a wetland hydroperiod for either greater than or equal to 6 to 12.5 percent of the
growing season (41 wells) or for greater than 12.5 to 25 percent of the growing season (45 wells)
regardless of rainfall conditions, while six wells did not exhibit a wetland hydroperiod (Table 2B,
Figure 6). Four wells recorded a wetland hydroperiod for the entire growing season. Most wells
also measured water tables shallower than -12 inches from 1 February through 27 February.
When excluding well data during above WETS normal rainfall periods
(June and September), the length of 39 of the longest hydroperiods was shorter by 1 -50 percent
(Table 3B, Figure 7). However, only 17 hydroperiods decreased enough to move to a lower
hydrologic zone. Two less wells recorded a wetland hydroperiod. Most wells still exhibited
wetland hydroperiods greater than or equal to 6 to 12.5 percent of the growing season or greater
than 12.5 to 25 percent of the growing season.
In the wetland enhancement area, where pre- construction data exists for
two wells, those wells recorded longer hydroperiods post- construction.
3.2.4 Hydroperiod Comparison to Control Forests.
3.2.4.1 Plum's Pit. Three of the wells exhibited longer hydroperiods in
2012 than in 2011. One of the wells in this forest experienced well malfunctions that included a
possible plug inside the well screen, causing the well to record water levels higher than they were
or other unreliable readings. However, this well is situated in a wetland area that frequently has
water levels at least 12 inches below the surface or shallower and so its estimated hydrologic
zone of greater than 75 percent is likely accurate. Another well recorded a wetland hydroperiod
greater than 75 percent of the growing season, one recorded a hydroperiod of 39 percent, and a
fourth well recorded a wetland hydroperiod of 13 percent (Table 2B, Figure 6). One of the wells
recorded more cumulative days where water tables were shallower than -12 inches than in 2011,
but the other three wells recorded less cumulative days (Table 2B). Two wells also measured
water tables shallower than -12 inches from 1 February through 27 February, one well for 16 days
in February, and a fourth well had a well malfunction that resulted in a data gap for most of
February (Table 2B).
When excluding well data during above WETS normal rainfall periods
(June and September), all four hydroperiods were reduced and three were classified in the next
lower hydrologic zone (Table 3B, Figure 7). The other hydroperiod was too short to be
considered a wetland hydroperiod.
3.2.4.2 Windley. Two of the wells had wetland hydroperiods of 24 and
25 percent in 2012, which were a few days less than last year; however, those wells had more
cumulative days where water tables were shallower than -12 inches than in 2011 (Table 2B,
Figure 6). The third well had a wetland hydroperiod for 44 percent of the growing season, which
was 22 days longer than last year and that well also had many more cumulative days where
water tables were shallower than -12 inches (Table 2B). Two of the wells also measured water
tables shallower than -12 inches from 1 February through 27 February and one measured them
for 22 days in February (Table 2B). When excluding well data during above WETS normal rainfall
periods (June and September), only one of the hydroperiods was reduced (Table 3B, Figure 7).
3.2.4.3 Winfield. The seven wells in the Winfield tract were installed on
27 July 2011 after an agreement with the owner was reached to use the site as a hydrological
control during the monitoring period; therefore, early spring hydroperiods were not recorded, if
they occurred, and so comparisons cannot be equally made with this year. Two of the wells did
not exhibit a wetland hydroperiod (Table 2B, Figure 6), two less than last year. Three wells
exhibited a wetland hydroperiod for >_6 percent to 12.5 percent of the growing season, one for
>_12.5 to 25 percent, and one for >_25 to 75 percent (Table 2B, Figure 6). All wells recorded water
Hell Swamp /Scott Creek Mitigation Site 6 PCS Phosphate Company, Inc.
Third Annual Report April 2013

tables shallower than -12 inches at other times than the longest hydroperiod and three wells
recorded those levels for most or all of February (Table 2B). When excluding well data during
above WETS normal rainfall periods (June and September), two of the hydroperiods were
reduced. Only one of those was shortened enough to change hydrologic zone, which was to the
no wetland hydroperiod category (Table 3B, Figure 7).
3.3 Vegetation. By use of only the number of planted stems that were
unquestionably alive in the monitoring plots, the most conservative estimate of survival is
presented. Many stems appeared dead or questionable, but based on prior monitoring
experience, a stem needs to appear dead (or not be found) for two sampling events before it can
be confidently counted as dead. Table 5 through Table 7 document current survival of all
vegetation plots by size category and wetland mitigation zone compared to baseline and are
described in more detail in sections below. In summary, the density of all trees in 2012, based on
the 123 riparian and non - riparian plots, was 358 unquestionably alive stems per acre; the density
of all unquestionably alive shrubs was 12 stems per acre; and the density of all trees, shrubs, and
unknown stems that were unquestionably alive was 370 stems per acre (Table 8). Appendix C
contains the number of stems that were alive in each plot for the baseline sampling event and for
the fall 2012 survey.
Treatment to control the invasive common reed (Phragmites australis) occurred 8 -10
August 2012 using a combination of Glyphosate and Imazapyr sprayed from a Marsh Master and
an ATV with a tank sprayer. A second application was made 11 October 2012 using a
combination of Glyphosate and Imazapyr sprayed from a Marsh Master. Treatments were
applied in the lower, unplanted swampy area of Scott Creek, the lower end of the UT6 and UT7
valley, the lower end of UT5, and along the filled channel of the former Scott Creek channel. This
was the third year of treatment and it appeared that some of the common reed was stunted.
More applications are anticipated for at least two more years if necessary.
The Corps determined that three tree species have the possibility to outcompete young
planted trees at a mitigation site due to their quick growth and need to be monitored as nuisance
species to ensure they do not take over a mitigation site. The three species are loblolly pine
(Pinus taeda), red maple (Acer rubrum), and sweetgum (Liquidambar styraciflua). Results of the
first nuisance monitoring survey, which was in the second year (2011) of site monitoring,
indicated that when all three species were combined, they represented 47.8 percent of the 180
stems counted in the 123 plots. The amount of loblolly pine was identified as a potential problem
in three plots. For more information see the second annual (2011) report (CZR 2012). Results of
the second nuisance monitoring survey, which was in the third year (2012) of site monitoring,
indicated that when all three species were combined, they represented 40 percent of the 370
stems counted in the 123 plots (Figure 7). This year's monitoring showed that other species not
considered nuisance trees are establishing themselves, reducing the percentage of the nuisance
trees. Furthermore, six plots contained 78 percent of the nuisance stems (Figure 7), which was
82 percent of the pine stems, 86 percent of the maple stems, and 70 percent of the sweet gum
stems. The six plots are all on the edges of Hell Swamp adjacent to existing pine stands or
mixed forest, where invasions of nuisance species are more likely to occur (Figure 7). This issue
will be discussed with the Corps of Engineers and a course of action determined.
3.3.1 Riparian Buffer. Overall survival of trees that were unquestionably alive
in the 19 riparian buffer plots from baseline (mid- summer 2010) to fall 2012 was 75 percent, with
a corresponding density of 669 trees per acre (Table 5), lower and less than last year. If trees
with uncertain survival status (stem appeared dead but could not be confirmed) are included with
trees that were definitely alive, survival increases to 85 percent and a density of 763 trees per
acre. Sweet bay (Magnolia virginiana), red bay (Persea palustris), water tupelo (Nyssa aquatica),
and sweet pepperbush (Clethra alnifolia) had the lowest survivals (25, 38, 40, and 40 percent,
respectively) when excluding the uncertain stems (Table 5). The single stem of water hickory that
was tagged was likely never alive or was misidentified since it has not shown up in sampling.
Eight (down from 12 in 2011) of the 20 tree species had 80 percent or greater survival, with four
Hell Swamp /Scott Creek Mitigation Site 7 PCS Phosphate Company, Inc.
Third Annual Report April 2013

of the eight at 100 percent survival (white oak [Quercus alba], water oak [Q. nigra], willow oak [Q.
phellos] and common persimmon [Diospyros virginiana]). If uncertain stems are added, one more
species reaches 100 percent (laurel oak).
Only three shrub species represented by only a few stems were found in the
riparian buffer plots; likely due to the overall low density of shrubs across the site and the small
size of the buffer plot. Overall survival of shrubs from baseline (mid- summer 2010) measurement
to fall 2012 was 64 percent for stems that were unquestionably alive (none were questionable)
with a corresponding density of 22 shrubs per acre (Table 5), slightly higher than last year.
Buttonbush (Cephalanthus occidentalis, 1 stem) had the lowest survival (0 percent) and swamp
doghobble (Leucothoe racemosa, 1 stem) had the highest survival (100 percent). The third
species, Virginia willow (Itea virginica) was represented by six stems that were unquestionably
alive but its survival was at 67 percent. Buttonbush survival is much higher in the other two
monitoring area types.
Density in the potential riparian buffer areas for all trees and shrubs combined
after the fall 2012 survey was 691 stems per acre for all species unquestionably alive and 785
stems per acre if species with alive and uncertain survival status are combined, both less than
last year. The current density is much higher than the 320 stems required for success, so even
though densities and survivals are lower than last year, it is anticipated that the densities will
remain above the minimum required amount.
3.3.2 Riparian Areas /Bottomlands. Within the 12 plots located in
riparian /bottomland areas, overall survival of trees from baseline (mid- summer 2010) to fall 2012
was 73 percent for stems unquestionably alive, with a corresponding density of 302 stems per
acre (Table 6). If trees with uncertain survival status (stem appeared dead but could not be
confirmed) are included with trees that were definitely alive, survival increases to 82 percent and
a density of 336 trees per acre. Out of the definitely identified species, red bay and sweet bay
had the lowest survival in 2012 (6 and 7 percent, respectively). Survival of six of the 18 tree
species was 90 percent or greater and one of these six was 100 percent. When the uncertain
stems are included, survival of nine species was 90 percent or greater, two of which were 100
percent.
Overall survival of shrubs from baseline (mid- summer 2010) to fall 2012 was 51
percent for stems that were unquestionably alive, with a corresponding density of 7 shrubs per
acre, similar to last year (Table 6). If shrubs with uncertain survival status (stem appeared dead
for the current sampling event but could not be confirmed and will be confirmed at the next event)
are included with shrubs that were definitely alive (less conservative estimate of survival), survival
increases to 60 percent and a density of 8 shrubs per acre.
Density in the riparian /bottomlands areas for all trees and shrubs combined after
the fall 2012 survey was 309 stems per acre for all species unquestionably alive and 345 stems
per acre if species with alive and uncertain survival status are combined.
3.3.3 Non - riparian Hardwood Flat. Overall survival of trees unquestionably
alive in the 111 plots representing the non - riparian hardwood flat area from baseline (mid-
summer 2010) to fall 2012 was 87 percent, with a corresponding density of 364 trees per acre
(Table 7), less than last year. If trees with uncertain survival status (stem appeared dead but
could not be confirmed) are included with trees that were definitely alive, survival increases to 92
percent and a density of 385 trees per acre, less than last year. Out of the 24 definitely identified
species, sourwood (Oxydendron arboreum) and red bay had the lowest survival (0 and 7 percent,
respectively) when excluding the uncertain stems and 12 species had 90 percent or greater
survival, two of which were 100 percent- common persimmon and possumhaw (Ilex decidua)
(Table 7). When adding the uncertain stems, 16 had 90 percent or greater survival, four of which
had 100 percent survival.
Hell Swamp /Scott Creek Mitigation Site 8 PCS Phosphate Company, Inc.
Third Annual Report April 2013

Overall survival of shrubs from baseline (mid- summer 2010) to fall 2012 was 81
percent for stems that were unquestionably alive, with a corresponding density of 13 shrubs per
acre (Table 7), similar to last year. If shrubs with uncertain survival status (stem appeared dead
for the current sampling event but could not be confirmed and will be confirmed at the next event)
are included with shrubs that were definitely alive (less conservative estimate of survival), survival
increases to 87 percent and a density of 13 shrubs per acre, similar to last year. Swamp rose
(Rosa palustris) had the lowest survival when excluding the uncertain stems (0 percent) but was
represented by only 1 stem and was followed by spicebush (Lindera benzoin, 33 percent) (Table
7). Swamp doghobble and possumhaw viburnum (Viburnum nudum) had the highest survival
(100 percent) when excluding uncertain stems and the remaining six species had greater than 80
percent survival. If uncertain stems are combined with those unquestionably alive, survival of
seven of the ten species was greater than 90 percent, two of which were 100 percent.
Density in the non - riparian hardwood flat areas for all trees and shrubs combined
after the 2012 survey was 377 stems per acre for all species unquestionably alive (84 percent
survival), and 399 stems per acre if species with alive and uncertain survival status are combined
(89 percent survival) (Table 7). Even though densities are lower than last year, both density
estimates are higher than the required 260 stems.
3.5 Photographic Documentation. A few photos representative of 2012 conditions
are paired with baseline photos at the same location for comparison (Appendix D). More are
available upon request.
4.0 SUMMARY
According to WETS rainfall estimates, 30 -day rolling total rainfall amounts in June and September
were above normal range (Figure 5).
Post - restoration wetland hydrology and flow monitoring for success officially began January 2011.
Most wells on the entire Hell Swamp site, including on the nine headwater valley systems,
recorded wetland hydroperiods during periods of normal or below normal rainfall. Wells at Plum's
Pit and Windley reference forests recorded wetland hydroperiods similar to longer hydroperiods
of Hell Swamp and wells in the Winfield reference forest recorded a range of wetland
hydroperiods similar to Hell Swamp wells. Some evidence of flow (braided patterns, channel
formation, flowing water, sediment sorting) has been seen in some areas of most of the stream
valley systems, including the single- thread channel for the second year in a row.
Overall survival of trees unquestionably alive in the 19 riparian buffer plots from baseline (mid-
summer 2010) to fall 2012 was 75 percent, with a corresponding density of 669 trees per acre.
Overall survival of shrubs in the potential riparian buffer areas from baseline (mid- summer 2010)
to fall 2012 was 64 percent for stems that were unquestionably alive, with a corresponding
density of 22 shrubs per acre. Survival density in the potential riparian buffer areas for all trees
and shrubs combined after the 2012 survey was 691 stems per acre for all species
unquestionably alive and 785 stems per acre if species with alive and uncertain survival status
are combined.
Overall survival of trees unquestionably alive in the other 12 riparian plots from baseline (mid-
summer 2010) to fall 2012 was 73 percent, with a corresponding density of 302 trees per acre.
Overall survival of shrubs in the riparian plots from baseline (mid- summer 2010) to fall 2012 was
51 percent for stems that were unquestionably alive, with a corresponding density of 7 shrubs per
acre. Survival density in the 12 riparian plots for all trees and shrubs combined after the 2012
survey was 309 stems per acre for all species unquestionably alive and 345 stems per acre if
species with alive and uncertain survival status are combined. When all riparian data are
Hell Swamp /Scott Creek Mitigation Site 9 PCS Phosphate Company, Inc.
Third Annual Report April 2013

combined, density was 309 stems per acre and survival was 68 percent for stems unquestionably
alive.
Overall survival of trees in the 111 non - riparian hardwood flat plots from baseline (mid- summer
2010) survey to fall 2012 was 87 percent, with a corresponding density of 364 trees per acre.
Overall survival of shrubs in the hardwood flat areas from baseline (mid- summer 2010)
measurement to fall 2012 was 81 percent for stems that were unquestionably alive, with a
corresponding density of 13 shrubs per acre. Survival density in the non - riparian hardwood flat
areas for all trees and shrubs combined after the 2012 survey was 377 stems per acre for all
species unquestionably alive and 399 stems per acre if species with alive and uncertain survival
status are combined.
Overall survival of all stems unquestionably alive at Hell Swamp is 82 percent with 370 stems per
acre; with the uncertain stems added, survival increased to 87 percent and 393 stems per acre.
All planted areas are currently above density success requirements for each type of mitigation.
Hell Swamp /Scott Creek Mitigation Site 10 PCS Phosphate Company, Inc.
Third Annual Report April 2013

LITERATURE CITED
CZR Incorporated. 2009. Compensatory Mitigation Plan for Restoration of Hell Swamp /Scott
Creek Watershed.
CZR Incorporated. 2010. As -Built Report for the Hell Swamp /Scott Creek Restoration Site.
CZR Incorporated 2011. Baseline and First Annual Report for the Hell Swamp /Scott Creek
Restoration Site.
CZR Incorporated 2012. Second Annual (2011) Report for the Hell Swamp /Scott Creek
Restoration Site.
Kirby, Robert M. 1995. The soil survey of Beaufort County, North Carolina. Natural Resources
Conservation Service, USDA.
U.S. Army Corps of Engineers. 2002. Regulatory guidance letter (RGL) 02 -02. Guidance on
Compensatory mitigation projects for aquatic resource impacts under the Corps
regulatory program pursuant to Section 404 of the Clean Water Act and Section 10 of the
Rivers and Harbors Act.
U.S. Army Corps of Engineers, EPA, NC Wildlife Resources Commission, and NC Division of
Water Quality. 2003. Stream Mitigation Guidelines. Wilmington, NC.
U.S. Army Corps of Engineers. 2005. Technical Standard for Water -Table Monitoring of Potential
Wetland Sites. WRAP Technical Notes Collection (ERDC TN- WRAP- 05 -2.) U.S. Army
Engineer Research and Development Center, Vicksburg, MS
U.S. Army Corps of Engineers and NC Division of Water Quality. 2007. Draft information on
stream restoration with emphasis on the coastal plain. 4 April supplement to USACOE,
et al. 2003.
U.S. Army Corps of Engineers. 2008. Regulatory Guidance Letter (RGL) 08 -03. Minimum
monitoring requirements for compensatory mitigation projects involving the restoration,
establishment, and /or enhancement of aquatic resources.
U.S. Army Corps of Engineers. 2010. Regional supplement to the Corps of Engineers wetland
delineation manual: Atlantic and Gulf coastal plain region. Version 2.0. J.S. Wakeley,
R.W. Lichvar, and C.V. Noble, eds. ERCD /EL TR- 08 -30, Vicksburg, MS.
Hell Swamp /Scott Creek Mitigation Site 11 PCS Phosphate Company, Inc.
Third Annual Report April 2013

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Table 4. Summary of 2012 flow gauge data and visual observations (see Table B -1) from upper Scott Creek and its
headwater systems (UT1 -UT7) and a tributary to Smith Creek (UT8).
Notes:
Flow meter data often erratic and difficult to interpret- especially at sites with frequent ponding (0)
' Number of months in 2012 with visual documentation of flow.
2 Total may not be the sum of all events by month if an event overlapped two months.
3 Number of calendar days with at least one reading from a flow event.
* Gauges in the single thread segment of upper Scott Creek (USC)
T -47
Number of months
with visual
Number of
Number of calendar
Consecutive days of
Flow station
z
3
Dates of longest flow event(s)
observation of
flow events
days with flow
longest flow event
flow'
USC -1 B °*
1
6
86
9/2 -10/18
47
USC -213°*
6
5
205
6/12 -10/5
116
USC -313°*
6
9
38
6/17 -6/25
9
USC -413°*
7
6
33
8/27 -9/11
16
USC -513
5
5
26
5/22 -6/6
16
USC -613°
none
11
215
1/12 -4/16
96
USC -713°
1
11
32
10/15 -10/27
13
USC -813°
1
3
5
6/26 -6/27; 10/26 -10/27
2 each
USC -913
6
19
129
8/19 -9/23
36
USC -10B
6
9
106
2/19 -3/16
27
USC -11 B°
1
3
246
1/22 -5/22
112
UT1 -1B
5
17
63
8/18 -8/31
14
UT1 -2B
none
39
108
9/2 -9/21
20
UT1 -3B
2
30
61
5/29 -6/9
12
UT1 -4B
1
6
14
5/22 -5/29
8
UT2 -1 B
none
15
25
8/23 -8/25; 9/2 -9/4
3 each
UT3 -1 B
2
none
none
none
none
UT3 -213
6
20
88
5/22 -6/3
13
UT3 -313
4
4
7
5/22 -5/24
3
UT3 -4B
1
10
35
8/6 -8/17
12
UT3 -513
none
1
41
1/1 -2/10
41
UT3 -613
3
13
106
1/25 -2/22
13
UT3 -713
6
10
74
2/16 -3/1
15
UT3 -813
3
3
9
8/23 -8/26; 10/29 -10/31
4 each
UT3 -913
none
none
none
none
none
UT4 -1 B
none
27
53
8/6 -8/12
7
UT4 -213
none
2
3
8/19 -8/20
2
UT6 -3B°
1
5
5
5/10, 5/22, 5/25, 5/30,12/17
1 each
UT6 -4B
3
13
61
2/16 -2/26
11
UT6 -513
3
18
58
5/22 -6/2
12
UT6 -613
1
none
none
none
none
UT7 -1 B
1
1
1
5/27
1
UT7 -213
none
5
5
1/10, 1/11, 4/4, 4/7, 6/28
1 each
UT7 -313
none
4
14
8/20 -8/26
7
UT8 -1 B°
7
6
174
3/6 -5/2
58
UT8 -213
5
14
4
1/25 -1/28
4
UT8 -3B°
6
3
10
12/26 -12/31
6
UT8 -4B
1
4
10
5/21 -5/25
5
UT8 -513
4
4
64
2/7 -3/6; 11/13 -12/11
29 each
UT8 -613
5
11
90
8/24 -10/15
53
Notes:
Flow meter data often erratic and difficult to interpret- especially at sites with frequent ponding (0)
' Number of months in 2012 with visual documentation of flow.
2 Total may not be the sum of all events by month if an event overlapped two months.
3 Number of calendar days with at least one reading from a flow event.
* Gauges in the single thread segment of upper Scott Creek (USC)
T -47

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Table 8. Third annual (fall 2012) survival of trees and shrubs planted in 123 0.22 -acre plots (riparian
and non - riparian) at Hell Swamp.
'The number tagged at baseline has been adjusted to reflect the proper identification of species in the
fall sampling event and extra planted stems found in subsequent monitoring years. The baseline
survival columns were not adjusted for this.
2Survival was considered unsure if the stem appeared dead (brittle, no green, broken, etc.) at the
current sampling event and dead if at both the current and last sampling events the stem was not
unquestionably alive.
3Total includes alive + unsure.
T -52
Tagged at
Fall 2012 stems
baseline'
Alive
Unsure
Tota13
RIPARIAN PLOTS
Trees
Stems
1,086
798
89
887
Density
411
302
34
336
Shrubs
Stems
35
18
3
21
Density
13
7
1
8
Unknown
Stems
80
1
3
4
TOTAL RIPARIAN
Total stems
1,201
817
95
912
Total density
455
309
36
345
'The number tagged at baseline has been adjusted to reflect the proper identification of species in the
fall sampling event and extra planted stems found in subsequent monitoring years. The baseline
survival columns were not adjusted for this.
2Survival was considered unsure if the stem appeared dead (brittle, no green, broken, etc.) at the
current sampling event and dead if at both the current and last sampling events the stem was not
unquestionably alive.
3Total includes alive + unsure.
T -52
Tagged at
Fall 2012 stems
baseline'
Alive
Unsure
Tota13
NON - RIPARIAN PLOTS
Trees
Stems
10,176
8,893
499
9,392
Density
417
364
20
385
Shrubs
Stems
377
306
23
329
Density
15
13
1
13
Unknown
Stems
422
1
11
12
TOTAL NON - RIPARIAN
Total stems
10,975
9,200
533
9,733
Total density
450
377
22
399
'The number tagged at baseline has been adjusted to reflect the proper identification of species in the
fall sampling event and extra planted stems found in subsequent monitoring years. The baseline
survival columns were not adjusted for this.
2Survival was considered unsure if the stem appeared dead (brittle, no green, broken, etc.) at the
current sampling event and dead if at both the current and last sampling events the stem was not
unquestionably alive.
3Total includes alive + unsure.
T -52
Tagged at
Fall 2012 stems
baseline'
Alive
Unsure
Tota13
ALL PLOTS
Trees
Stems
11,262
9,691
588
10,279
Density
416
358
22
380
Shrubs
Stems
412
324
26
350
Density
15
12
1
13
Unknown
Stems
502
2
14
16
TOTAL ALL PLOTS
Total stems
12,176
10,017
628
10,645
Total density
450
370
23
393
'The number tagged at baseline has been adjusted to reflect the proper identification of species in the
fall sampling event and extra planted stems found in subsequent monitoring years. The baseline
survival columns were not adjusted for this.
2Survival was considered unsure if the stem appeared dead (brittle, no green, broken, etc.) at the
current sampling event and dead if at both the current and last sampling events the stem was not
unquestionably alive.
3Total includes alive + unsure.
T -52

r 1 Y _
' ,y .l ' �• h � SLatax7anY' .
3 _ BRo ISl.nn
1 111 �.,�'�� .�� ... _ - ,. `•e�, �...r�
1 r.l.% }!r• r' SEED TICK NECK RO ` \
/[il�Cf` r . • r. �. , r RT. 264
N.
I MS PIT
llu
CONTROL
WETLANDTOREST -
WINDLEY • r '' CONTROL /UONGrrUD
LATITUDE: TS 41' o7. as` RT. 96
• Y.nt�rf41E • ��::�� / LATOUDE: 35 31' 31.4188-
•+� Y-�� -'- WETLAND FOREST \'/'. V'•
HELL SWAMP-
-~� PUNGO -r SCOTT CREEK. !'
CREEK ROAD I .. h,.an:, =r2r •,
. J: I f. .,'..i _; '• - I .. ~ - ��.i� ,±E'er
S A
T_ Ii G1 _F _ l .. - WINFIELD
•�c , , - CONTROL r `
- - •, - WETLAND FOREST
'h. fi n1� • �~ � ,, -,�- f '� - - -^ .. �.- ., � i 7 �y ��� ,''�/I'c��rs•^ �
- •.._:�ca;:
Fsx , Ward r --
1 pt n
• '' -I.>llr Cron.
0 5,000 100000
NORTH CAROLINA
SCALE IN FEET
SITE LOCATION HELL SWAMP VICINITY MAP
HELL SWAMP -SCOTT CREEK
LEGEND PCS PHOSPHATE COMPANY, INC.
HELL SWAMP PROJECT BOUNDARY SCALE: AS SHOWN APPROVED BY: DRAWN BY: BFG /TLJ
CONTROL PARCELS DATE: 04/25/12 FILE: HELLSMP_VIC_201 1 RPT
CP# 174559.66
SOURCE: 4709 COLLEGE ACRES DRIVE NORTH CAROLINA DEPARTMENT OF TRANSPORTATION, USGS TOPOGRAPHIC MAP SUITE 2
IMAGES, NC STATEPLANE, NAD83, FEET, 1:24000— SCALE, USGSTOPOTILE083.SID, WILMINGTON, NORTH CAROLINA 28403
AND USGS TOPOTILE113.510, USGS QUADRANGLES RANSOMVILLE AND PANTEGO, I TEL [phone] FIGURE 1
WEB SITE: WWW.NCDOT.ORG ENVIRONMENTAL CONSULTANTS FAX [phone]

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v

APPENDIX A
2012 Hydrogeomorphic Stream Surveys and Cross Section
Measurements

BAKER ENGINEERING 2012 HELL SWAMP CROSS SECTION MEASUREMENT
1.0 Geomorphic Monitoring
For monitoring stream success criteria, 34 permanent cross - sections were installed following construction
in 2010. In accordance with the Hell Swamp Mitigation Plan (CZR July 2009), three cross - sections were
established per 1,000 foot reach of stream/valley restoration. The permanent cross - sections are used to
monitor channel formation and scour over time. For the riparian headwater systems (no defined channel
construction), these cross - sections were measured for the as -built report, at Year 3, and will also be
measured at Year 5 if channel features form. For the Scott Creek single thread channel stream restoration
segment, two cross - sections were measured for the as -built report and are surveyed annually during the
monitoring period.
1.1 Geomorphic Success Criteria
Valleys should remain stable with minimal changes through the monitoring period; however,
these cross - sections may show minor changes in flow patterns as valleys develop.
1.1.1 Permanent Cross - section Monitoring Results
Two permanent cross - sections (7 and 8) are established in the Scott Creek single thread
channel. Year 3 monitoring data from these two cross - sections were collected in December
2012. Cross - sectional data collected during this monitoring event were compared to the as-
built baseline data collected in 2010 and Year 2 data collected in 2011. Cross - sectional
graphs and data from each of the monitored cross - sections are presented at the end of this
report.
Permanent cross - section 7 is located across a riffle at station 47 +66 on Scott Creek.
According to the Year 3 survey data, the channel features in riffle cross - section 7 have
remained relatively stable since as -built conditions. No significant areas of concern regarding
the channel along this cross - section were noted following Year 3 monitoring. The survey
data did record some changes in the floodplain along cross - section 7 in Year 2, as well as
Year 3. The floodplain changes observed are attributed to flood deposition, soil settling,
maturing vegetation, and slight differences in survey rod point locations. Both the riffle and
floodplain observations noted are expected with newly constructed restoration sites, where
some minor adjustments are common.
Permanent cross - section 8 is located across a pool at station 52 +81 on Scott Creek.
According to the Year 3 survey data, the channel features in pool cross - section 8 have also
remained relatively stable since as -built conditions. The Year 3 survey data show that cross -
section 8 has experienced some minor deposition within the pool area of the channel, but this
is common for pools in restored meandering channels, and will likely vary from year to year,
depending upon the flow frequency and magnitude. The survey data also recorded some
changes in the floodplain along cross - section 8. The channel and floodplain changes
observed along cross - section 8 are attributed to flood deposition, soil settling, maturing
vegetation, and slight difference in survey rod point locations. Both the pool and floodplain
observations noted are expected with newly constructed restoration sites, where some minor
adjustments are common.
Hell Swamp /Scott Creek Mitigation Site
Third Annual Report
Appendix A
A -1 PCS Phosphate Company, Inc.
April 2013

According to the Year 3 survey data, cross - sections 7 and 8 have experienced some slight
adjustments and settling since as -built conditions. The adjustments observed in the monitored
cross - sections are minor and are not considered to demonstrate signs of instability. No areas
of appreciable scour were observed within the Scott Creek single thread channel stream
restoration segment.
1.1.2 Additional Monitored Cross - sections
Seven additional permanent cross - sections (1, 2, 25, 26, 27, 33, and 34) were noted during
monitoring Year 3 to have exhibited slight changes from previous surveys within the channel
during a site field visit in November 2012. Therefore, due to the channel observations noted,
survey monitoring data from these seven cross - sections were collected in December 2012.
Cross - sectional data collected during this monitoring event were compared to the as -built
baseline data collected in the 2010 as -built data. Cross - sectional graphs and data from each
of the additional monitored cross - sections are presented below.
1. 1.3 Areas of Concern
No areas of concern have been identified for the restored headwater prongs.
Hell Swamp Cross - section 1
10
9
o 8
ca
m
w 7
As -Built Year 3
6
0 50 100 150 200 250 300 350 400 450
Station (ft)
Hell Swamp /Scott Creek Mitigation Site
Third Annual Report
Appendix A
A -2 PCS Phosphate Company, Inc.
April 2013

7
M
o 5
ca
m
MI.
3 +
0
M
3
o 2
ca
m
w
1
0 +
0
Hell Swamp Cross - section 2
As -Built Year 3
JV IVV I JV GVV L JV JV V JJV 'YV V `TJV
Station (ft)
Hell Swamp Cross - section 7
As -Built — Year 2
Year 3 - - -& -- Bankfull
- - -- Floodprone
JV IVV I JV GVV L JV JV V JJV 'YV V `TJV
Station (ft)
Hell Swamp /Scott Creek Mitigation Site A -3 PCS Phosphate Company, Inc.
Third Annual Report April 2013
Appendix A

5
4
,^ 3
o 2
ca
(D 1
w
0
-1
3
M
o 1
ca
m
w
0
Hell Swamp Cross - section 8
IFWF
As -Built Year 2
�f Year 3 Bankfull
YY - - -- Floodprone
0 50 100 150 200 250 300 350 400 450
Station (ft)
0
Hell Swamp Cross - section 25
As -Built Year 3
50 100 150 200
Station (ft)
r__V1T�
Hell Swamp /Scott Creek Mitigation Site A -4 PCS Phosphate Company, Inc.
Third Annual Report April 2013
Appendix A

Hell Swamp Cross - section 26
2.5
1.5
0.5
c
0
> -0.5
m
w
-1.5
As -Built Year 3
-2.5
0 50 100 150 200 250
Station (ft)
Hell Swamp Cross - section 27
3
2
o
1
ca
m
w
0
As -Built Year 3
-1
0 50 100 150 200 250
Station (ft)
Hell Swamp /Scott Creek Mitigation Site A -5 PCS Phosphate Company, Inc.
Third Annual Report April 2013
Appendix A

5
I:!
o 3
ca
m
W
Hell Swamp Cross - section 33
1 �
0
As -Built Year 3
50 100 150 200
Station (ft)
rl.�
Hell Swamp Cross - section 34
5
4
o 3
ca
m
w
2
As -Built Year 3
1
0 50 100 150 200 250
Station (ft)
Hell Swamp /Scott Creek Mitigation Site A -6 PCS Phosphate Company, Inc.
Third Annual Report April 2013
Appendix A

APPENDIX B
2012 Flow Events Recorded by Low Flow Gauges, Observer Data,
and Stream Survey Results in Each Tributary or Headwater System

Table B -1. Monthly summary of flow at USC1 B. Voltage calibration 1.25 volts; flow is defined as >_ 0.5
gal /min (meter installed on 2/1/2011).
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
2
6
February
3.43
2
19
March
4.52
1
3
April
2.41
0
0
May
13.31
1
9
June
2.61
1
2
July
6.38
0
0
August
9.26
0
0
September
6.4
1
29
October
4.02
1
18
November
0.75
0
0
December
4.78
0
0
TOTAL
60.75
6
86
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -2. Flow events recorded at USC1 B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
Flow event Date(s) of flow event Number of consecutive calendar
days with flow
1 1/22-1/24 3
2 1/28-1/30 3
3 2/8 -2/15 8
4 2/19 -3/3 14
5 5/23 -6/2 11
6 9/2 -10/18 47
B -1

Table B -3. Monthly summary of flow at USC2B. Voltage calibration 1.25 volts; flow is defined as >_
0.5gal /min (meter installed on 2/1/2011).
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
0
0
February
3.43
0
0
March
4.52
0
0
April
2.41
1
9
May
13.31
0
31
June
2.61
2
21
July
6.38
1
31
August
9.26
1
31
September
6.4
1
30
October
4.02
2
22
November
0.75
2
20
December
4.78
2
10
TOTAL
60.75
5
205
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -4. Flow events recorded at USC2B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
Flow event Date(s) of flow event Number of consecutive calendar
days with flow
1 4/22 -6/2 42
2 6/12 -10/5 116
3 10/15-11/4 21
4 11/15-12/7 23
5 12/22 -12/24 3
MEN

Table B -5. Monthly summary of flow at USC3B. Voltage calibration 1.25 volts; flow is defined as >_
0.5gal /min (meter installed on 2/1/2011).
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
0
0
February
3.43
0
0
March
4.52
1
1
April
2.41
0
0
May
13.31
4
13
June
2.61
1
9
July
6.38
0
0
August
9.26
0
0
September
6.4
0
0
October
4.02
1
5
November
0.75
2
7
December
4.78
1
3
TOTAL
60.75
9
38
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -6. Flow events recorded at USC3B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
Flow event Date(s) of flow event Number of consecutive calendar
days with flow
1 3/4 1
2 5/5 -5/6 2
3 5/8 -5/11 4
4 5/19 1
5 5/22 -5/27 6
6 6/17 -6/25 9
7 10/25 -10/29 5
8 11/9-11/14 6
9 11/30-12/3 4
B -3

Table B -7. Monthly summary of flow at USC4B. Voltage calibration 1.25 volts; flow is defined as >_ 0.5
gal /min (meter installed on 4/2/2011).
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
0
0
February
3.43
0
0
March
4.52
0
0
April
2.41
0
0
May
13.31
0
0
June
2.61
1
2
July
6.38
0
0
August
9.26
1
5
September
6.4
3
22
October
4.02
2
4
November
0.75
0
0
December
4.78
0
0
TOTAL
60.75
6
33
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -8. Flow events recorded at USC4B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
Flow event Date(s) of flow event Number of consecutive calendar
days with flow
1 6/8 -6/9 2
2 8/27 -9/11 16
3 9/14 -9/23 10
4 9/29 1
5 10/2 -10/4 3
6 10/10 1
B -4

Table B -9. Monthly summary of flow at USCSB. Voltage calibration set at 1.25 volts, flow is defined as >_ 0.5
gal /min (meter installed on 4/2/2011).
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
0
0
February
3.43
2
4
March
4.52
2
6
April
2.41
0
0
May
13.31
1
10
June
2.61
1
6
July
6.38
0
0
August
9.26
0
0
September
6.4
0
0
October
4.02
0
0
November
0.75
0
0
December
4.78
0
0
TOTAL
60.75
5
26
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -10. Flow events recorded at USCSB. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
Flow event Date(s) of flow event Number of consecutive calendar
days with flow
1 2/5 1
2 2/19 -2/21 3
3 3/4 -3/6 3
4 3/25 -3/27 3
5 5/22 -6/6 16
B -5

Table B -11. Monthly summary of flow at USC6B. Voltage calibration 1.25 volts; flow is defined as >_ 0.5
gal /min (meter installed on 2/1/2011).
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
1
20
February
3.43
1
29
March
4.52
1
31
April
2.41
2
28
May
13.31
2
26
June
2.61
1
25
July
6.38
2
11
August
9.26
2
14
September
6.4
2
14
October
4.02
1
6
November
0.75
2
7
December
4.78
1
4
TOTAL
60.75
11
215
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -12. Flow events recorded at USC6B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
BE
Number of consecutive calendar
Flow event
Date(s) of event
days with flow
1
1/12-4/16
96
2
4/19 -5/9
21
3
5/15 -6/25
42
4
7/13 -7/17
5
5
7/23 -7/28
6
6
8/13 -8/15
3
7
8/21 -9/1
12
8
9/6 -9/18
13
9
10/26-11/3
9
10
11/6-11/9
4
11
12/22 -12/25
4
BE

Table B -13. Monthly summary of flow at USC7B. Voltage calibration 1.25 volts; flow is defined as >_ 0.1
gal /min, but inaccurate for volume estimates (meter installed on 2/2/2011).
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
0
0
February
3.43
0
0
March
4.52
3
4
April
2.41
2
2
May
13.31
3
5
June
2.61
1
1
July
6.38
0
0
August
9.26
0
0
September
6.4
1
5
October
4.02
1
13
November
0.75
2
2
December
4.78
0
0
TOTAL
60.75
11
32
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -14. Flow events recorded at USC7B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
B -7
Number of consecutive calendar
Flow event
Date(s) of event
days with flow
1
3/20 -3/22
3
2
3/25
1
3
4/13
1
4
4/30 -5/1
2
5
5/25 -5/27
3
6
5/31
1
7
6/3
1
8
9/5 -9/9
5
9
10/15 -10/27
13
10
11/8
1
11
11/19
1
B -7

Table B -15. Monthly summary of flow at USCBB. Voltage calibration 1.25 volts; flow is defined as >_ 0.5
gal /min, but inaccurate for volume estimates (meter installed on 2/2/2011).
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
0
0
February
3.43
0
0
March
4.52
0
0
April
2.41
0
0
May
13.31
0
0
June
2.61
1
2
July
6.38
0
0
August
9.26
1
1
September
6.4
0
0
October
4.02
1
2
November
0.75
0
0
December
4.78
0
0
TOTAL
60.75
3
5
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -16. Flow events recorded at USCBB. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
Flow event Date(s) of event Number of consecutive calendar
days with flow
1 6/26 -6/27 2
2 8/31 1
3 10/26 -10/27 2
BE

Table B -17. Monthly summary of flow at USC9B. Voltage calibration 1.25 volts; flow is defined as >_ 0.5
gal /min, but inaccurate for volume estimates (meter installed on 2/2/2011).
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
3
3
February
3.43
5
15
March
4.52
3
17
April
2.41
1
5
May
13.31
1
11
June
2.61
1
6
July
6.38
1
1
August
9.26
2
14
September
6.4
2
24
October
4.02
2
24
November
0.75
2
9
December
4.78
0
0
TOTAL
60.75
19
129
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -18. Flow events recorded at USC9B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
:•
Number of consecutive calendar
Flow event
Date(s) of event
days with flow
1
1/11
1
2
1/21
1
3
1/27
1
4
2/5 -2/9
5
5
2/10 -2/12
3
6
2/16
1
7
2/19 -2/22
4
8
2/24 -2/25
2
9
3/3 -3/14
12
10
3/25 -3/28
4
11
3/31 -4/5
6
12
5/21 -6/6
17
13
7/1
1
14
8/11
1
15
8/19 -9/23
36
16
9/30
1
17
10/2 -10/4
3
18
10/11-11/7
28
19
11/10-11/11
2
:•

Table B -19. Monthly summary of flow at USC10B. Voltage calibration 1.25 volts; flow is defined as >_ 0.5
gal /min, but inaccurate for volume estimates (meter installed on 2/2/2011).
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
0
0
February
3.43
2
19
March
4.52
2
21
April
2.41
1
8
May
13.31
1
10
June
2.61
1
7
July
6.38
0
0
August
9.26
1
13
September
6.4
2
21
October
4.02
2
7
November
0.75
0
0
December
4.78
0
0
TOTAL
60.75
9
106
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -20. Flow events recorded at USC10B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
B -10
Number of consecutive calendar
Flow event
Date(s) of event
days with flow
1
2/5 -2/12
8
2
2/19 -3/16
27
3
3/25 -3/29
5
4
4/11 -4/18
8
5
5/22 -6/7
17
6
8/19 -9/12
25
7
9/14 -9/22
9
8
10/2 -10/4
3
9
10/12 -10/15
4
B -10

Table B -21. Monthly summary of flow at USC11 B. Voltage calibration 1.25 volts; flow is defined as >_ 0.5
gal /min, but inaccurate for volume estimates (meter installed on 2/9/2011).
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
1
10
February
3.43
1
29
March
4.52
1
31
April
2.41
1
30
May
13.31
2
18
June
2.61
1
22
July
6.38
0
0
August
9.26
1
4
September
6.4
1
30
October
4.02
1
31
November
0.75
1
30
December
4.78
1
11
TOTAL
60.75
3
246
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -22. Flow events recorded at USC11 B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
Flow event Date(s) of event Number of consecutive calendar
days with flow
1 1/22-5/12 112
2 5/26 -6/22 28
3 8/28 -12/11 106
B -11

Table B -23. Monthly summary of flow at UT1 -1 B. Voltage calibration 1.25 volts; flow is defined as >_ 0.5
gal /min, but inaccurate for volume estimates (meter installed on 2/1/2011).
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
1
1
February
3.43
0
0
March
4.52
0
0
April
2.41
0
0
May
13.31
1
4
June
2.61
3
8
July
6.38
3
8
August
9.26
3
20
September
6.4
5
17
October
4.02
1
2
November
0.75
0
0
December
4.78
1
3
TOTAL
60.75
17
63
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -24. Flow events recorded at UT1 -1 B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
B -12
Number of consecutive calendar
Flow event
Date(s) of event
days with flow
1
1/22
1
2
5/28 -6/6
10
3
6/7
1
4
6/8
1
5
7/11 -7/12
2
6
7/17
1
7
7/21 -7/25
5
8
8/7 -8/8
2
9
8/10 -8/13
4
10
8/18 -8/31
14
11
9/3 -9/5
3
12
9/8 -9/11
4
13
9/13
1
14
9/14 -9/17
4
15
9/18 -9/22
5
16
10/30 -10/31
2
17
12/29 -12/31
3
B -12

Table B -25. Monthly summary of flow at UT1 -2B. Voltage calibration 1.25 volts; flow is defined as >_ 0.5
gal /min, but inaccurate for volume estimates (meter installed on 2/1/2011).
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flout
January
2.88
2
2
February
3.43
4
15
March
4.52
6
12
April
2.41
5
6
May
13.31
6
14
June
2.61
3
4
July
6.38
4
8
August
9.26
5
20
September
6.4
2
21
October
4.02
3
5
November
0.75
1
1
December
4.78
0
0
TOTAL
60.75
39
108
1 Total may not be the sum of all events by month if an event overlapped two months
2 Number of calendar days with at least one reading from a flow event.
Table B -26. Flow events recorded at UT1 -2B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
Flow event
Date(s) of event
Number of consecutive calendar
days with flow
1
1/27
1
2
1/28
1
3
2/3
1
4
2/4 -2/8
5
5
2/16 -2/22
7
6
2/25 -2/26
2
7
3/3 -3/7
5
8
3/10 -3/11
2
9
3/26
1
10
3/27
1
11
3/28
1
12
3/30 -4/1
3
13
4/4
1
14
4/5 -4/6
2
15
4/23
1
16
4/26
1
17
5/3
1
18
5/6
1
19
5/9
1
20
5/17 -5/18
2
21
5/22 -5/29
8
22
5/31 -6/2
3
23
6/5
1
24
6/26
1
25
7/9 -7/13
5
26
7/22
1
27
7/23
1
28
7/28
1
29
8/2
1
30
8/4
1
31
8/6 -8/9
4
32
8/11 -8/12
2
33
8/18 -8/29
12
34
9/2 -9/21
20
35
9/29
1
36
10/2 -10/3
2
37
10/8 -10/9
2
38
10/15
1
39
11/7
1
B -13

Table B -27. Monthly summary of flow at UT1 -313. Voltage calibration 1.25 volts; flow is defined as ? 0.5
gal /min, but inaccurate for volume estimates (meter installed on 2/1/2011).
Month Monthly rainfall Number of flow events' Number of calendar days with flown
January
2.88
0
0
February
3.43
0
0
March
4.52
0
0
April
2.41
0
0
May
13.31
1
3
June
2.61
2
10
July
6.38
8
9
August
9.26
8
9
September
6.4
8
18
October
4.02
2
4
November
0.75
2
7
December
4.78
1
1
TOTAL
60.75
30
61
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -28. Flow events recorded at UT1 -313. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
Flow event
Date(s) of event
Number of consecutive calendar
days with flow
1
5/29 -6/9
12
2
6/26
1
3
7/1 -7/2
2
4
7/11
1
5
7/13
1
6
7/14
1
7
7/17
1
8
7/23
1
9
7/24
1
10
7/28
1
11
8/2
1
12
8/8
1
13
8/9
1
14
8/11
1
15
8/19 -8/20
2
16
8/29
1
17
8/30
1
18
8/31
1
19
9/3 -9/4
2
20
9/5
1
21
9/6 -9/7
2
22
9/8
1
23
9/9 -9/12
4
24
9/13
1
25
9/14 -9/17
4
26
9/19 -9/21
3
27
10/4 -10/5
2
28
10/30-11/4
6
29
11/6-11/8
3
30
12/13
1
B -14

Table B -29. Monthly summary of flow at UT1 -413. Voltage calibration 1.25 volts; flow is defined as >_ 0.5
gal /min, but inaccurate for volume estimates (meter installed on 2/1/2011).
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
2
3
February
3.43
0
0
March
4.52
0
0
April
2.41
0
0
May
13.31
2
9
June
2.61
0
0
July
6.38
0
0
August
9.26
1
1
September
6.4
0
0
October
4.02
1
1
November
0.75
0
0
December
4.78
0
0
TOTAL
60.75
6
14
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -30. Flow events recorded at UT1 -413. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
Flow event Date(s) of event Number of consecutive calendar
days with flow
1 1/23-1/24 2
2 1/29 1
3 5/16 1
4 5/22 -5/29 8
5 8/11 1
6 10/18 1
B -15

Table B -31. Monthly summary of flow at UT2 -1 B. Voltage calibration 1.25 volts; flow is defined as >_ 0.5
gal /min, but inaccurate for volume estimates (meter installed on 2/1/2011).
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
0
0
February
3.43
0
0
March
4.52
0
0
April
2.41
0
0
May
13.31
0
0
June
2.61
0
0
July
6.38
0
0
August
9.26
7
11
September
6.4
8
14
October
4.02
0
0
November
0.75
0
0
December
4.78
0
0
TOTAL
60.75
15
25
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -32. Flow events recorded at UT2 -1 B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
B -16
Number of consecutive calendar
Flow event
Date(s) of event
days with flow
1
8/7
1
2
8/8
1
3
8/19 -8/20
2
4
8/23 -8/25
3
5
8/26
1
6
8/28
1
7
8/28 -8/29
2
8
9/2 -9/4
3
9
9/6
1
10
9/6 -9/7
2
11
9/8
1
12
9/8 -9/9
2
13
9/14 -9/15
2
14
9/18 -9/19
2
15
9/26
1
B -16

Table B -33. Monthly summary of flow at UT3 -1 B. Voltage calibration 1.25 volts; flow is defined as >_ 0.5
gal /min, but inaccurate for volume estimates (meter installed on 2/1/2011).
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
0
0
February
3.43
0
0
March
4.52
0
0
April
2.41
0
0
May
13.31
0
0
June
2.61
0
0
July
6.38
0
0
August
9.26
0
0
September
6.4
0
0
October
4.02
0
0
November
0.75
0
0
December
4.78
0
0
TOTAL
60.75
0
0
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -34. Flow events recorded at UT3 -1 B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
Flow event Date(s) of event Number of consecutive calendar
days with flow
No Flow Events Recorded for UT3 -1 B
B -17

Table B -35. Monthly summary of flow at UT3 -2B. Voltage calibration 1.25 volts; flow is defined as >_ 0.5 gal /min, but
inaccurate for volume estimates (meter installed on 2/1/2011).
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
3
9
February
3.43
4
20
March
4.52
3
13
April
2.41
1
7
May
13.31
2
11
June
2.61
1
3
July
6.38
2
2
August
9.26
1
9
September
6.4
4
10
October
4.02
1
4
November
0.75
0
0
December
4.78
0
0
TOTAL
60.75
20
88
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -36. Flow events recorded at UT3 -2B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered unreliable and
left out of calculations).
Flow event
Date(s) of event
Number of consecutive calendar days
with flow
1
1/11 -1/12
2
2
1/21 -1/24
4
3
1/27-1/29
3
4
2/2
1
5
2/5 -2/9
5
6
2/10 -2/12
3
7
2/16 -2/26
11
8
3/3 -3/10
8
9
3/25 -3/28
4
10
3/31 -4/7
8
11
5/17
1
12
5/22 -6/3
13
13
7/1
1
14
7/10
1
15
8/19 -8/27
9
16
9/3
1
17
9/8 -9/10
3
18
9/14 -9/16
3
19
9/18 -9/20
3
20
10/27 -10/30
4
B -18

Table B -37. Monthly summary of flow at UT3 -3B. Voltage calibration 1.25 volts; flow is defined as >_ 0.5
gal /min, but inaccurate for volume estimates (meter installed on 2/1/2011).
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
0
0
February
3.43
0
0
March
4.52
0
0
April
2.41
0
0
May
13.31
1
3
June
2.61
0
0
July
6.38
0
0
August
9.26
1
2
September
6.4
1
1
October
4.02
1
1
November
0.75
0
0
December
4.78
0
0
TOTAL
60.75
4
7
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -38. Flow events recorded at UT3 -3B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
Flow event Date(s) of event Number of consecutive calendar
days with flow
1 5/22 -5/24 3
2 8/24 -8/25 2
3 9/3 1
4 10/9 1
B -19

Table B -39. Monthly summary of flow at UT3 -4B. Voltage calibration 1.25 volts; flow is defined as >_ 0.5
gal /min, but inaccurate for volume estimates (meter installed on 2/1/2011).
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
0
0
February
3.43
0
0
March
4.52
0
0
April
2.41
0
0
May
13.31
2
8
June
2.61
2
3
July
6.38
2
3
August
9.26
3
20
September
6.4
1
1
October
4.02
0
0
November
0.75
0
0
December
4.78
0
0
TOTAL
60.75
10
35
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -40. Flow events recorded at UT3 -4B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
B -20
Number of consecutive calendar
Flow event
Date(s) of event
days with flow
1
5/23 -5/24
2
2
5/26 -5/31
6
3
6/10
1
4
6/20 -6/21
2
5
7/15 -7/16
2
6
7/31
1
7
8/2
1
8
8/6 -8/17
12
9
8/25 -8/31
7
10
9/3
1
B -20

Table B -41. Monthly summary of flow at UT3 -5B. Voltage calibration 1.25 volts; flow is defined as >_ 0.5
gal /min, but inaccurate for volume estimates (meter installed on 2/1/2011).
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
1
31
February
3.43
1
10
March
4.52
0
0
April
2.41
0
0
May
13.31
0
0
June
2.61
0
0
July
6.38
0
0
August
9.26
0
0
September
6.4
0
0
October
4.02
0
0
November
0.75
0
0
December
4.78
0
0
TOTAL
60.75
1
41
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -42. Flow events recorded at UT3 -5B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
Flow event Date(s) of event Number of consecutive calendar
days with flow
1 1/1-2/10 41
B -21

Table B -43. Monthly summary of flow at UT3 -6B. Voltage calibration 1.25 volts; flow is defined as >_ 0.5
gal /min, but inaccurate for volume estimates (meter installed on 2/1/2011).
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
2
14
February
3.43
2
27
March
4.52
1
6
April
2.41
1
1
May
13.31
2
11
June
2.61
2
8
July
6.38
0
0
August
9.26
1
9
September
6.4
3
20
October
4.02
2
8
November
0.75
0
0
December
4.78
1
2
TOTAL
60.75
13
106
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -44. Flow events recorded at UT3 -6B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
B -22
Number of consecutive calendar
Flow event
Date(s) of event
days with flow
1
1/10-1/16
7
2
1/25-2/22
29
3
2/25 -3/6
11
4
4/26
1
5
5/4
1
6
5/22 -6/3
13
7
6/14 -6/18
5
8
8/19 -8/27
9
9
9/3
1
10
9/9 -9/10
2
11
9/14 -10/6
23
12
10/9 -10/12
2
13
12/16 -12/17
2
B -22

Table B -45. Monthly summary of flow at UT3 -7B. Voltage calibration 1.25 volts; flow is defined as >_ 0.5
gal /min, but inaccurate for volume estimates (meter installed on 2/1/2011).
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
1
4
February
3.43
3
25
March
4.52
4
19
April
2.41
1
8
May
13.31
1
10
June
2.61
2
7
July
6.38
0
0
August
9.26
0
0
September
6.4
1
1
October
4.02
0
0
November
0.75
0
0
December
4.78
0
0
TOTAL
60.75
10
74
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -46. Flow events recorded at UT3 -7B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
B -23
Number of consecutive calendar
Flow event
Date(s) of event
days with flow
1
1/27-1/30
4
2
2/2
1
3
2/5 -2/14
10
4
2/16 -3/1
15
5
3/3 -3/14
12
6
3/25 -3/29
5
7
3/31 -4/8
9
8
5/22 -6/4
14
9
6/5 -6/7
3
10
9/11
1
B -23

Table B -47. Monthly summary of flow at UT3 -8B. Voltage calibration 1.25 volts; flow is defined as >_ 0.5
gal /min, but inaccurate for volume estimates (meter installed on 2/1/2011).
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
0
0
February
3.43
0
0
March
4.52
0
0
April
2.41
0
0
May
13.31
0
0
June
2.61
0
0
July
6.38
0
0
August
9.26
1
4
September
6.4
0
0
October
4.02
1
4
November
0.75
0
0
December
4.78
1
1
TOTAL
60.75
3
9
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -48. Flow events recorded at UT3 -8B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
Flow event Date(s) of event Number of consecutive calendar
days with flow
1 8/23 -8/26 4
2 10/29 -10/31 4
3 12/20 1
B -24

Table B -49. Monthly summary of flow at UT3 -9B. Voltage calibration 1.25 volts; flow is defined as >_ 0.5
gal /min, but inaccurate for volume estimates (meter installed on 2/1/2011).
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
0
0
February
3.43
0
0
March
4.52
0
0
April
2.41
0
0
May
13.31
0
0
June
2.61
0
0
July
6.38
0
0
August
9.26
0
0
September
6.4
0
0
October
4.02
0
0
November
0.75
0
0
December
4.78
0
0
TOTAL
60.75
0
0
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -50. Flow events recorded at UT3 -9B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
Flow event Date(s) of event Number of consecutive calendar
days with flow
No Flow Events Recorded at UT3 -9B
B -25

Table B -51. Monthly summary of flow at UT4 -1 B. Voltage calibration 1.25 volts; flow is defined as ? 0.5
gal /min, but inaccurate for volume estimates (meter installed on 2/1/2011).
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flown
January
2.88
0
0
February
3.43
0
0
March
4.52
0
0
April
2.41
0
0
May
13.31
2
2
June
2.61
0
0
July
6.38
7
14
August
9.26
7
15
September
6.4
4
7
October
4.02
3
9
November
0.75
4
4
December
4.78
1
2
TOTAL
60.75
27
53
' Total may not be the sum of all events by month if an event overlapped two months
2 Number of calendar days with at least one reading from a flow event.
Table B -52. Flow events recorded at UT4 -1 B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
B -26
Number of consecutive calendar
Flow event
Date(s) of event
days with flow
1
5/25
1
2
5/30
1
3
7/1
1
4
7/9 -7/10
2
5
7/11
1
6
7/12
1
7
7/16
1
8
7/20 -7/25
6
9
7/27 -7/28
2
10
8/1
1
11
8/4
1
12
8/6 -8/12
7
13
8/18
1
14
8/19
1
15
8/20
1
16
8/23 -8/25
3
17
9/3
1
18
9/8 -9/9
2
19
9/14 -9/15
2
20
9/18 -9/19
2
21
10/2 -10/3
2
22
10/19
1
23
10/26-11/1
7
24
11/7
1
25
11/13
1
26
11/15
1
27
12/7 -12/8
2
B -26

Table B -53. Monthly summary of flow at UT4 -2B. Voltage calibration 1.25 volts; flow is defined as >_
0.5 gal /min, but inaccurate for volume estimates (meter installed on 2/1/2011).
1 Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -54. Flow events recorded at UT4 -2B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
Flow event Date(s) of event Number of consecutive calendar
days with flow
1 8/2 1
2 8/19 -8/20 2
B -27
Number of calendar days with
Month
Monthly rainfall
Number of flow events
flow2
January
2.88
0
0
February
3.43
0
0
March
4.52
0
0
April
2.41
0
0
May
13.31
0
0
June
2.61
0
0
July
6.38
0
0
August
9.26
2
3
September
6.4
0
0
October
4.02
0
0
November
0.75
0
0
December
4.78
0
0
TOTAL
60.75
2
3
1 Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -54. Flow events recorded at UT4 -2B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
Flow event Date(s) of event Number of consecutive calendar
days with flow
1 8/2 1
2 8/19 -8/20 2
B -27

Table B -55. Monthly summary of flow at UT6 -3B. Voltage calibration 1.245 volts; flow is defined as >_ 0.5
gal /min, but inaccurate for volume estimates (meter installed on 2/5/2011).
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
0
0
February
3.43
0
0
March
4.52
0
0
April
2.41
0
0
May
13.31
4
4
June
2.61
0
0
July
6.38
0
0
August
9.26
0
0
September
6.4
0
0
October
4.02
0
0
November
0.75
0
0
December
4.78
1
1
TOTAL
60.75
5
5
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -56. Flow events recorded at UT6 -3B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
Flow event Date(s) of event Number of consecutive calendar
days with flow
1 5/10 1
2 5/22 1
3 5/25 1
4 5/30 1
5 12/17 1
B -28

Table B -57. Monthly summary of flow at UT6 -4B. Voltage calibration 1.26 volts; flow is defined as >_ 0.5
gal /min, but inaccurate for volume estimates (meter installed on 2/2/2011).
Meter malfunctioned on 5/31 after heavy rainfall from Tropical Storm Beryl;
data after mulfunction not used.
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
1
7
February
3.43
4
20
March
4.52
4
11
April
2.41
4
13
May
13.31
1
10
June
2.61
0
0
July
6.38
0
0
August
9.26
0
0
September
6.4
0
0
October
4.02
0
0
November
0.75
0
0
December
4.78
0
0
TOTAL 60.75 13 61
1 Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -58. Flow events recorded at UT6 -4B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
Flow event
Date(s) of event
Number of consecutive calendar
days with flow
1
1/21 -1/27
7
2
2/2
1
3
2/5 -2/9
5
4
2/10 -2/12
3
5
2/16 -2/26
11
6
3/3 -3/6
4
7
3/9 -3/10
2
8
3/25 -3/28
4
9
3/31 -4/3
4
10
4/4 -4/7
4
11
4/22
1
12
4/26 -4/30
5
13
5/22 -5/31
10
B -29

Table B -59. Monthly summary of flow at UT6 -5B. Voltage calibration 1.25 volts; flow is defined as >_ 0.5
gal /min, but inaccurate for volume estimates (meter installed on 2/2/2011).
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
2
4
February
3.43
5
16
March
4.52
4
10
April
2.41
3
5
May
13.31
1
10
June
2.61
1
2
July
6.38
1
3
August
9.26
0
0
September
6.4
0
0
October
4.02
2
6
November
0.75
1
2
December
4.78
0
0
TOTAL
60.75
18
58
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -60. Flow events recorded at UT6 -5B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
B -30
Number of consecutive calendar
Flow event
Date(s) of event
days with flow
1
1/21 -1/22
2
2
1/27-1/28
2
3
2/5 -2/8
4
4
2/10 -2/12
3
5
2/16 -2/17
2
6
2/19 -2/23
5
7
2/24 -2/25
2
8
3/3 -3/6
4
9
3/9 -3/10
2
10
3/25 -3/27
3
11
3/31 -4/2
3
12
4/5
1
13
4/6 -4/7
2
14
5/22 -6/2
12
15
7/17 -7/19
3
16
10/16 -10/17
2
17
10/27 -10/30
4
18
11/7-11/8
2
B -30

Table B -61. Monthly summary of flow at UT6 -6B. Voltage calibration 1.25 volts; flow is defined as >_ 0.5
gal /min, but inaccurate for volume estimates (meter installed on 2/2/2011).
Unit did not display a uniform response to rainfall events and poor correlation to rainfall was evident all year.
Lots of noise on graph; voltage adjustment did not improve the output.
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
0
0
February
3.43
0
0
March
4.52
0
0
April
2.41
0
0
May
13.31
0
0
June
2.61
0
0
July
6.38
0
0
August
9.26
0
0
September
6.4
0
0
October
4.02
0
0
November
0.75
0
0
December
4.78
0
0
TOTAL
60.75
0
0
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -62. Flow events recorded at UT6 -6B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
Flow event Date(s) of event Number of consecutive calendar
days with flow
No Flow Events Recorded at UT6 -6B
B -31

Table B -63. Monthly summary of flow at UT7 -1 B. Voltage calibration 1.25 volts; flow is defined as >_ 0.5
gal /min, but inaccurate for volume estimates (meter installed on 2/2/2011).
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
0
0
February
3.43
0
0
March
4.52
0
0
April
2.41
0
0
May
13.31
1
1
June
2.61
0
0
July
6.38
0
0
August
9.26
0
0
September
6.4
0
0
October
4.02
0
0
November
0.75
0
0
December
4.78
0
0
TOTAL
60.75
1
1
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -64. Flow events recorded at UT7 -1 B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
Flow event Date(s) of event Number of consecutive calendar
days with flow
1 5/27 1
B -32

Table B -65. Monthly summary of flow at UT7 -2B. Voltage calibration 1.25 volts; flow is defined as >_ 0.5
gal /min, but inaccurate for volume estimates (meter installed on 2/2/2011).
Data gap 1 /1 -1 /10 due to equipment malfunction.
Month Monthly rainfall Number of flow events' Number of calendar days with flow2
January
2.88
2
2
February
3.43
0
0
March
4.52
0
0
April
2.41
2
2
May
13.31
0
0
June
2.61
1
1
July
6.38
0
0
August
9.26
0
0
September
6.4
0
0
October
4.02
0
0
November
0.75
0
0
December
4.78
0
0
TOTAL
60.75
5
5
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -66. Flow events recorded at UT7 -2B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
Flow event Date(s) of event Number of consecutive calendar
days with flow
1 1/10 1
2 1/11 1
3 4/4 1
4 4/7 1
5 6/28 1
B -33

Table B -67. Monthly summary of flow at UT7 -3B. Voltage calibration 1.25 volts; flow is defined as >_ 0.5
gal /min, but inaccurate for volume estimates. (meter installed on 2/2/2011).
Data gap 1 /1 -1 /10 due to equipment malfunction.
Month Monthly rainfall Number of flow events' Number of calendar days with flow2
January
2.88
0
0
February
3.43
0
0
March
4.52
0
0
April
2.41
0
0
May
13.31
0
0
June
2.61
0
0
July
6.38
0
0
August
9.26
1
7
September
6.4
3
7
October
4.02
0
0
November
0.75
0
0
December
4.78
0
0
TOTAL
60.75
4
14
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -68. Flow events recorded at UT7 -3B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
Flow event Date(s) of event Number of consecutive calendar
days with flow
1 8/20 -8/26 7
2 9/8 1
3 9/9 -9/10 2
4 9/15 -9/18 4
B -34

Table B -69. Monthly summary of flow at UT8 -1 B. Voltage calibration 1.25 volts; flow is defined
as >_ 0.5 gal /min, but inaccurate for volume estimates.
TOTAL 60.75 6 174
1 Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -70. Flow events recorded at UT8 -1 B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
Flow event Date(s) of event Number of consecutive calendar
days with flow
1 3/6 -5/2 58
2 6/23 -7/10 18
3 7/15 -7/29 15
4 8/11 1
5 8/20 -8/21 2
6 10/13 -12/31 80
B -35
Number of calendar days
Month
Monthly rainfall
Number of flow events
with flow2
January
2.88
0
0
February
3.43
0
0
March
4.52
1
26
April
2.41
1
30
May
13.31
1
2
June
2.61
1
8
July
6.38
2
25
August
9.26
2
3
September
6.4
0
0
October
4.02
1
19
November
0.75
1
30
December
4.78
1
31
TOTAL 60.75 6 174
1 Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -70. Flow events recorded at UT8 -1 B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
Flow event Date(s) of event Number of consecutive calendar
days with flow
1 3/6 -5/2 58
2 6/23 -7/10 18
3 7/15 -7/29 15
4 8/11 1
5 8/20 -8/21 2
6 10/13 -12/31 80
B -35

Table B -71. Monthly summary of flow at UT8 -2B. Voltage calibration 1.25 volts; flow is defined
as >_ 0.5 gal /min, but inaccurate for volume estimates.
TOTAL 60.75 14 21
1 Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -72. Flow events recorded at UT8 -2B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
Number of consecutive calendar
Number of calendar
Month
Monthly rainfall
Number of flow events'
days with flow2
January
2.88
2
5
February
3.43
0
0
March
4.52
3
4
April
2.41
0
0
May
13.31
3
5
June
2.61
0
0
July
6.38
0
0
August
9.26
4
5
September
6.4
0
0
October
4.02
2
2
November
0.75
0
0
December
4.78
0
0
TOTAL 60.75 14 21
1 Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -72. Flow events recorded at UT8 -2B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
B -36
Number of consecutive calendar
Flow event
Date(s) of event
days with flow
1
1/22
1
2
1/25-1/28
4
3
3/4
1
4
3/22 -3/23
2
5
3/25
1
6
5/11
1
7
5/17 -5/18
2
8
5/30 -5/31
2
9
8/12
1
10
8/20
1
11
8/24 -8/25
2
12
8/29
1
13
10/3
1
14
10/15
1
B -36

Table B -73. Monthly summary of flow at UT8 -3B. Voltage calibration 1.245 volts; flow is defined as >_ 0.5
gal /min, but inaccurate for volume estimates.
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
0
0
February
3.43
0
0
March
4.52
0
0
April
2.41
0
0
May
13.31
0
0
June
2.61
0
0
July
6.38
0
0
August
9.26
0
0
September
6.4
0
0
October
4.02
1
1
November
0.75
0
0
December
4.78
2
9
TOTAL
60.75
3
10
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -74. Flow events recorded at UT8 -3B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
Flow event Date(s) of event Number of consecutive calendar
days with flow
1 10/18 1
2 12/17 -12/19 3
3 12/26 -12/31 6
B -37

Table B -75. Monthly summary of flow at UT8 -4B. Voltage calibration 1.25 volts; flow is defined as >_ 0.5
gal /min, but inaccurate for volume estimates.
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
0
0
February
3.43
0
0
March
4.52
0
0
April
2.41
0
0
May
13.31
1
5
June
2.61
0
0
July
6.38
0
0
August
9.26
0
0
September
6.4
0
0
October
4.02
0
0
November
0.75
2
4
December
4.78
1
1
TOTAL
60.75
4
10
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -76. Flow events recorded at UT8 -4B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
Flow event Date(s) of event Number of consecutive calendar
days with flow
1 5/21 -5/25 5
2 11/2-11/3 2
3 11/12-11/13 2
4 12/20 1
B -38

Table B -77. Monthly summary of flow at UT8 -5B. Voltage calibration 1.25 volts; flow is defined as >_ 0.5
gal /min, but inaccurate for volume estimates.
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
0
0
February
3.43
1
23
March
4.52
1
6
April
2.41
2
6
May
13.31
0
0
June
2.61
0
0
July
6.38
0
0
August
9.26
0
0
September
6.4
0
0
October
4.02
0
0
November
0.75
1
18
December
4.78
1
11
TOTAL
60.75
4
64
' Total may not be the sum of all events by month if an event overlapped two months
2 Number of calendar days with at least one reading from a flow event.
Table B -78. Flow events recorded at UT8 -5B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
Flow event Date(s) of event Number of consecutive calendar
days with flow
1 2/7 -3/6 29
2 4/4 -4/7 4
3 4/10 -4/11 2
4 11/13-12/11 29
B -39

Table B -79. Monthly summary of flow at UT8 -6B. Voltage calibration 1.25 volts; flow is defined as >_ 0.5
gal /min, but inaccurate for volume estimates.
Month
Monthly rainfall
Number of flow events'
Number of calendar days with flow2
January
2.88
1
5
February
3.43
2
3
March
4.52
2
2
April
2.41
2
6
May
13.31
1
7
June
2.61
1
9
July
6.38
0
0
August
9.26
1
8
September
6.4
1
30
October
4.02
2
16
November
0.75
1
3
December
4.78
1
1
TOTAL
60.75
11
90
' Total may not be the sum of all events by month if an event overlapped two months.
2 Number of calendar days with at least one reading from a flow event.
Table B -80. Flow events recorded at UT8 -6B. (If only a single or few
readings of <0.5 gal /min were recorded, they were considered
unreliable and left out of calculations).
B -40
Number of consecutive calendar
Flow event
Date(s) of event
days with flow
1
1/24-1/28
5
2
2/1 -2/2
2
3
2/11
1
4
3/25
1
5
3/31 -4/12
5
6
4/8 -4/9
2
7
5/25 -6/9
16
8
8/24 -10/15
53
9
10/25
1
10
11/8-11/10
3
11
12/20
1
B -40

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2012 STREAM SURVEYS OF HELL SWAMP HEADWATER VALLEY SYSTEMS
On 27 June and 11 and 13 December 2012, all the headwater valleys at Hell Swamp were
walked to document active flow with video as appropriate, or evidence of past flow with photographs and
GPS data. Active low flow in various water depths was observed in Lower Scott Creek and Upper Scott
Creek (single thread and above) in both the June and December surveys. During the June survey, no
active flow or water was observed in any of the unnamed tributaries and no video was taken of Lower or
Upper Scott Creek, as flow was of low velocity and would not be easily seen in a video. The winter
survey occurred over two days in December with nearly one and a half inches of rainfall occurring
between the two days. The 11 December 2012 survey day was much like the June survey with the
exception of flow video recorded in Lower Scott Creek near the mouth of UT6 (Videos 1 and 2). There
were no other observations of active flow or water in any of the other unnamed tributaries on that day
except UT6. After the 12 December rain event, the stream crossing between Lower Scott Creek and
Upper Scott Creek was revisited on 13 December 2012 and active flow video was recorded (Video 3).
Several videos of active flow were also recorded for UT8 and are referenced later.
During each survey, each system was walked from the downstream end to the upstream reaches
and evidence of flow events and formation of any channel features were noted. In addition to active flow,
physical features noted included bed and bank, sediment transport and /or scour, debris wrack, vegetation
matted down parallel to downstream flow, or lack of vegetation. When evidence of channel formation was
longer than 10 feet, the perceived channel was walked with a GPS unit and data points were collected
along the axis, and at the beginning and end of the feature. Until the planted trees and shrubs reach
enough height to shade the valleys, development of dense herbaceous vegetation will continue to occur
in many areas. This herbaceous layer can attenuate flow events and reduce velocity below the point of
scour and can also obscure other incipient channel formation features. Photos of certain stream features
are included after the text descriptions below.
Lower Scott Creek. This segment includes the most downstream reach of the stream portion of
the project (fill of the channelized section of old Scott Creek and diversion of upstream flow back into the
swamp above the filled channel section) and ends at the first stream crossing constructed at the location
of the old Scott Creek culvert under the former farm road. During both the June and December surveys,
the lower end of the filled ditch up to the mouth of UT6 continued to exhibit stream features including bed
and bank formation, a meandering profile, sediment transport, lack of vegetation, and low velocity active
flow. The filled segment contained water from bank to bank from the project edge upstream beside the
old ditch spoil to the mouth of UT 6 where it enters into the vegetated Scott Creek swamp forest and
becomes indistinct (Photos 1 through 6). Active flow video was recorded in Lower Scott Creek near the
mouth of UT6 on 11 December 2012 (Videos 1 and 2). Between the downstream end of UT6 and the
constructed crossing, several flow paths were noted where water from the swamp had gone out of and
along the now - filled channel through breaks in the spoil piles left over from maintenance /construction of
the now - filled channel (Photos 7 and 8). These flowpaths in the filled channel contained little to no
vegetation and often had some stems (mainly on the edges) oriented parallel to flow. They tended to be
discontinuous and would migrate back into the swamp through another opening downstream or become
indiscernible with changes in elevation or vegetation. One potential flowpath for water going to Lower
Scott Creek was noted between the mouths UT6 and UT5 which is connected to the swamp around lower
Scott Creek, across the old filled channel; as the site matures, this feature may be confirmed as a
depression or a flowpath. No other stream features were found in the old filled Scott Creek channel nor in
the vegetated swamp forest of Scott Creek. However, a short 20 to 30 -foot channel has formed just
below the stream crossing (Photos 9 and 10). Video 3, taken on 13 December 2012, displays active flow
that drains into the Scott Creek vegetated swamp forest through this channel. No low flow gauges or
stream arrays are located in the lower Scott Creek filled ditch or vegetated swamp forest.
Hell Swamp /Scott Creek Mitigation Site B -42 PCS Phosphate Company, Inc.
Third Annual Report April 2013

Constructed Single Thread Channel of Upper Scott Creek. The channel contained dense
herbaceous vegetation in some locations and little to no flow was evident at the time of the June survey,
although there was water in the channel (Photo 11). During the December survey, water in the single
thread channel was more pooled, as was observed around USC -3B for example (Photo 12). Just
upstream of the mouth of UT1, a large overbank flood deposit of sediment was noted (Photos 13 and 14).
Photo 15 captures the morphology of the single thread channel just below the overbank flood deposit.
Upper Scott Creek. This segment begins above the constructed single thread portion of Scott
Creek. Flowpaths and vegetation matted down in the direction of flow were evident from above the
confluence with the single thread channel to above the stream crossing in both the June and December
surveys, but there was no water (Photos 16 and 17). Further upstream, at stream array USC5, water was
approximately 1 -2 feet deep, but flow was not evident in the June survey; however, in December, there
was no water present. In June, above (upstream) the next stream array, USC -613, the water in the valley
became shallower, and then was almost non - existent at USC -713. In December, the valley between USC -
6B and USC -713 contained 2 -3 feet deep intermittent ponds of water, but with no evidence of flow (Photos
18 through 21). In June and December, there was no surface water in the valley upstream of USC -713
through USC -913; however, there was a distinct flowpath throughout with slight bed and bank found just
downstream of USC -913 (Photos 22 through 25). The same flow features and channels evident in fall
2011 just downstream of USC -10B, were still evident in June and December 2012, but more vegetation
was present in some places (Photos 26 through 30). During the well check on 26 June, the day before
the stream survey, surface water 15 -20 inches deep was in the valley and in the flowpaths beyond
USC10B, but with no evident flow. At the December 2012 surveys, flowpaths were also evident above
USC -10B and continued upstream around USC -11 B, but no water was present (Photos 31 and 32).
UT8. During the June survey, the entire channel of UT8 above the stream crossing was dry with
numerous crayfish burrows along the valley edge and the valley floor was heavily vegetated with
Ludwigea and Bacopa spp. The dry valley in the June survey enabled several previously obscured
flowpaths to be seen. The first was in the vicinity of UT8 -3B, where approximately 55 feet of flowpath
was observed and then in the downstream vicinity of UT8 -6B, where approximately 80 feet of flowpath
was observed. Additionally, between UT8 -4B and UT8 -6B short discontinuous segments of scour, faint
bed and bank, and areas of scarce vegetation were also noted, but not marked with a GPS. In the
December survey, active flow was noted in UT8 from below the stream crossing through most of the
valley (Videos 4 -7; Video 6 shows UT8 -3B, Video 7 shows flow between 4B and 5B) and approximately
75 feet of flowpath was seen in the vicinity of UT8 -5B (upstream and downstream) (Photos 35 and 36).
Also in December, a fork with both bed and bank features was observed approximately 50 feet upstream
of UT8 -5B with active flow recorded on both sides of the fork (Photo 37 and Video 8). Continuous active
flow was observed for about another 50 feet upstream of the fork. In the vicinity (downstream and
upstream) of UT8 -6B 1 -2 feet of ponded water obscured flowpaths noted in the June survey (Photos 39
and 39). A previously identified channel feature continues to exist in the segment below the stream
crossing (Photos 33 and 34). The valley in the upper reach above UT8 -6B is very rutted (from earth -
moving machinery activity during construction) with dense vegetation consisting of Typhus and Juncus
spp.
UT7. None of the features noted in the 2011 surveys were evident in either the June or
December surveys and the faint non - vegetated flowpaths previously observed were vegetated with no
further development or evidence of flow.
Hell Swamp /Scott Creek Mitigation Site B -43 PCS Phosphate Company, Inc.
Third Annual Report April 2013

UT6. At the confluence of UT6 and lower Scott Creek, a 46 -foot long channel observed in 2011
contained more water at the time of the June 2012 survey and was not as easily discernible toward its
upper end; however, this channel was evident in the December survey and also displayed active flow as
observed previously in Videos 1 and 2. Beyond this channel there is an extensive section of standing
water until just downstream of the confluence with UT7 (Photos 40 and 41). (Vehicles used in nuisance
vegetation removal in this ponded area left large deep ruts which were not able to be smoothed into a
headwater valley shape during stream construction because the ground remained too wet to work.) In
the June survey between UT6 -4B and UT6 -5B, the perceived valley bottom was wetter than the
surrounding valley, the vegetation became sparse and oriented downstream, and the valley appeared to
split in two, although no strong evidence of bed and bank were noted; however, no evidence of flow was
observed in the December survey (Photos 42 through 45). Also during the June survey. the upper end of
the UT6 valley above array 5 was wetter than the valley downstream and there were more areas of
sparse vegetation where plant stems were imbricated in the direction of flow.
UT5. Natural channel development appears to be inhibited, or at least interrupted, by a large
tracked vehicle rut up the long axis of the valley and the entire lower valley is dissected by ruts across the
long axis.
UT4. While no water was apparent in the valley in the June or December surveys, a short
meandering flowpath approximately 160 -foot was noted near the downstream end between UT4-1B and
the forested swamp around Lower Scott Creek (Photos 46 and 47). Below the old farm road, there were
numerous ruts perpendicular to the long axis.
UT3. The lower end of this valley south of the old farm road appears too rutted across the long
axis for natural stream development, although a narrow un- vegetated channel has formed for 40 to 50
feet in the wooded edge of the swamp just below the restored valley (Photos 48 through 50). Flow
channels noted previously were less defined in both June and December surveys, but between UT3 - -2B
and UT3 -5B, areas with sparse vegetation, crayfish burrows, stems oriented parallel to flow direction, and
some small wrack piles were noted. Above UT3 -5B, wrack piles were periodic throughout the valley but
not continuous, as were short 10- to 20 -foot lengths of apparent flowpaths (Photos 51 through 54).
During the December survey, an old rut between UT3 -7B and UT3 -8B appeared to be developing
channel features and has the potential of functioning as a flowpath for approximately 130 feet (Photo 55).
UT2. There was no evidence of flow at the time of either survey. The valley is densely rutted and
heavily vegetated with herbaceous species in the top portion of the valley.
UT1. Dense Juncus and grass clumps made it difficult to find any flowpaths during the June
survey; however in the December survey, flowpaths were evident and the valley floor was densely
vegetated with Ludwigea spp.. UT1 seemed to be wetter than both the UT3 and UT4 valleys, with
prominent flowpaths observed at UT1 -1B, UT1 -313, and just downstream of UT1 -413, with small bed and
bank formation downstream of UT1 -4B (Photos 56 through 58). UT1 is not as rutted in the upper portions
as some other valleys, but there is some interruption of potential development by ruts.
Hell Swamp /Scott Creek Mitigation Site B -44 PCS Phosphate Company, Inc.
Third Annual Report April 2013

Lower Scott Creek (Photos 1 to 10)
Photo 1. Channel formation in filled ditch; view upstream to west.
Two trees in the middle of the background (on right of channel)
mark the mouth of UT6. 27 June 2012.
Photo 2. Close to same location as in Photo 1. 11 December
2012.
Hell Swamp /Scott Creek Mitigation Site B -45 PCS Phosphate Company, Inc.
Third Annual Report April 2013

Photo 3. Channel formation meander approximately 30 feet long.
Note same two trees visible in Photo 1 to right beyond biologist.
27 June 2012.
Photo 4. Close to same location as Photo 3. 11 December 2012.
Hell Swamp /Scott Creek Mitigation Site B -46 PCS Phosphate Company, Inc.
Third Annual Report April 2013

Photo 5. Biologist standing at fork in channel; one goes into
swamp to left and other goes beyond the biologist and connects
to UT6. Total channel length 121 feet. 27 June 2012.
Photo 6. Close to same location as Photo 5, slightly different
angle of fork of Lower Scott Creek and UT6, same short
horizontal branch in mid -left distance. Tree to right of photo is the
inmost tree of pair visible in Photos 1 and 2. 11 December 2012.
Hell Swamp /Scott Creek Mitigation Site B -47 PCS Phosphate Company, Inc.
Third Annual Report April 2013

Photo 7. Flow feature (Waypoint 4; —150 ft long) in old filled
channel of Scott Creek above UT 4 where swamp waters connect
to old channel through sporadic spoil piles. View upstream,
swamp to left. 27 June 2012.
Photo 8. Same feature as above, view downstream. 27 June
2012.
Hell Swamp /Scott Creek Mitigation Site B -48 PCS Phosphate Company, Inc.
Third Annual Report April 2013

Photo 9. Channel formed below stream crossing 1, view
downstream into Lower Scott Creek swamp. 27 June 2012.
Photo 10. Close to same location as Photo 9. 11 December 2012
Hell Swamp /Scott Creek Mitigation Site B -49 PCS Phosphate Company, Inc.
Third Annual Report April 2013

Constructed Single Thread Channel Scott Creek (Photos 11 to 15)
Photo 11. Upstream view at USC -31B. 27 June 2012.
Photo 12. Downstream view at USC -31B. 11 December 2012.
Hell Swamp /Scott Creek Mitigation Site B -50 PCS Phosphate Company, Inc.
Third Annual Report April 2013

Photo 13. Overbank flood deposit just upstream of mouth of UT1
(out of view to right of photo), view downstream towards Lower Scott
Creek swamp (tree line in mid -right distance). 27 June 2012.
Photo 14. Close to same location as Photo 13. 11 December 2012.
Hell Swamp /Scott Creek Mitigation Site B -51 PCS Phosphate Company, Inc.
Third Annual Report April 2013

Photo 15. Morphology of the single thread channel below Photos
13 and 14 above. 11 December 2012.
Hell Swamp /Scott Creek Mitigation Site B -52 PCS Phosphate Company, Inc.
Third Annual Report April 2013

Upper Scott Creek (Photos 16 to 32)
Photo 16. View downstream of flowpath and oriented stems below
the stream crossing on upper Scott Creek. 27 June 2012.
Photo 17. View upstream of flowpath below the stream crossing on
Upper Scott Creek. 11 December 2012.
Hell Swamp /Scott Creek Mitigation Site B -53 PCS Phosphate Company, Inc.
Third Annual Report April 2013

Photo 18. View downstream of flowpath through ponded water
above USC -613, water depth —3 -4 inches. 27 June 2012.
4 r
Photo 19. View downstream of flowpath close to same location as
Photo 18, above USC -613. 11 December 2012.
Hell Swamp /Scott Creek Mitigation Site B -54 PCS Phosphate Company, Inc.
Third Annual Report April 2013

Photo 20. View downstream from USC -71B along flowpath. 27
June 2012.
Photo 21. Close to same location as Photo 20. 11 December 2012.
Hell Swamp /Scott Creek Mitigation Site B -55 PCS Phosphate Company, Inc.
Third Annual Report April 2013

Photo 22. Downstream from almost at USC -8B, flowpath becoming
more vegetated. 27 June 2012.
Photo 23. Close to same location as Photo 22. 11 December 2012.
Hell Swamp /Scott Creek Mitigation Site B -56 PCS Phosphate Company, Inc.
Third Annual Report April 2013

Photo 24. Upstream from USC -91B of persistent flow path. 26 June
2012 (taken during well check).
Photo 25. Close to same location as Photo 24. 11 December 2012.
Hell Swamp /Scott Creek Mitigation Site B -57 PCS Phosphate Company, Inc.
Third Annual Report April 2013

(rs
Photo 27. Flowpath below USC -10B in close vicinity of Photo 26.
11 December 2012.
Hell Swamp /Scott Creek Mitigation Site B -58 PCS Phosphate Company, Inc.
Third Annual Report April 2013
1
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Photo 26. Downstream of flowpath below USC -10B. Stream array
9 marked with 2 white poles across valley (barely visible in treeline
at horizon). 27 June 2012.
Photo 27. Flowpath below USC -10B in close vicinity of Photo 26.
11 December 2012.
Hell Swamp /Scott Creek Mitigation Site B -58 PCS Phosphate Company, Inc.
Third Annual Report April 2013

Photo 28. Downstream below USC -10B, biologist at fork. Photo
taken from near top of small fork, main stem continues from
biologist to right of photo. 27 June 2012.
■
Photo 29. Upstream below USC -10B, biologist at fork in same
vicinity as Photo 28 from different orientation. 11 December 2012.
Hell Swamp /Scott Creek Mitigation Site B -59 PCS Phosphate Company, Inc.
Third Annual Report April 2013

Photo 30. Bed and bank formation at fork below USC -10B as seen
in Photos 28 and 29. 11 December 2012.
Photo 31. Upstream from USC -10B, water in channel on 26 June 2012.
Hell Swamp /Scott Creek Mitigation Site B -60 PCS Phosphate Company, Inc.
Third Annual Report April 2013

Photo 32. Close to same location as Photo 31. 11 December 2012.
Hell Swamp /Scott Creek Mitigation Site B -61 PCS Phosphate Company, Inc.
Third Annual Report April 2013

UT8 (Photos 33 to 39)
,
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Photo 33. Downstream of narrow, sparsely vegetated channel,
from UT8 stream crossing. 27 June 2012.
Photo 34. Close to same location as Photo 33, downstream of
stream crossing. 13 December 2012.
Hell Swamp /Scott Creek Mitigation Site B -62 PCS Phosphate Company, Inc.
Third Annual Report April 2013
61'J
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Photo 33. Downstream of narrow, sparsely vegetated channel,
from UT8 stream crossing. 27 June 2012.
Photo 34. Close to same location as Photo 33, downstream of
stream crossing. 13 December 2012.
Hell Swamp /Scott Creek Mitigation Site B -62 PCS Phosphate Company, Inc.
Third Annual Report April 2013

Photo 35. Downstream at UT8 -5B, faint bed and bank, sorting, lack
of vegetation. 27 June 2012.
Photo 36. Close to same location as Photo 35. 13 December 2012.
Hell Swamp /Scott Creek Mitigation Site B -63 PCS Phosphate Company, Inc.
Third Annual Report April 2013

Photo 37. Upstream above UT8 -5B, biologist at fork. Bed and bank
formation; active flow on both sides of fork. 13 December 2012.
Photo 38. Downstream from UT8 -6B about 150 feet, bed and bank
development, lack of vegetation, and sorting in — 80 -foot flowpath.
27 June 2012.
Hell Swamp /Scott Creek Mitigation Site B -64 PCS Phosphate Company, Inc.
Third Annual Report April 2013

J J ti i4f �
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Photo 39. Close to same location as Photo 38. 13 December 2012.
Hell Swamp /Scott Creek Mitigation Site B -65 PCS Phosphate Company, Inc.
Third Annual Report April 2013
x
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4
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Photo 39. Close to same location as Photo 38. 13 December 2012.
Hell Swamp /Scott Creek Mitigation Site B -65 PCS Phosphate Company, Inc.
Third Annual Report April 2013

UT6 (Photos 40 to 45)
Photo 40. View upstream from mouth of UT6. 27 June 2012.
Photo 41. Little different view upstream of UT6 than presented in
Photo 40 (photographer is further back from the trees in the
foreground of Photo 40). Fork in Lower Scott Creek channel from
Photos 5 and 6 can be observed in the bottom left corner.
11 December 2012.
Hell Swamp /Scott Creek Mitigation Site B -66 PCS Phosphate Company, Inc.
Third Annual Report April 2013

Photo 42. Downstream toward UT6 -4B flow gauge shows lack of
vegetation in vicinity of very small flow feature near the gauge.
Photo 43. Close to same location as Photo 42. 11 December 2012.
Hell Swamp /Scott Creek Mitigation Site B -67 PCS Phosphate Company, Inc.
Third Annual Report April 2013

Photo 44. Downstream view in vicinity of UT6 -5B, lack of vegetation and
stems oriented to flow path. Much of this mid -to -upper UT6 valley had
areas of stem orientation but little visible channel features.
Photo 45. Close to same location as Photo 44. 11 December 2012.
Hell Swamp /Scott Creek Mitigation Site B -68 PCS Phosphate Company, Inc.
Third Annual Report April 2013

UT4 (Photos 46 to 47)
Photo 46. Downstream along new flowpath at bottom of UT4 with
wrack, scour, and lack of vegetation along its length. 27 June 2012.
Photo 47. Faint bed and bank along flowpath in Photo 46 near the
bottom of UT4. 11 December 2012.
Hell Swamp /Scott Creek Mitigation Site B -69 PCS Phosphate Company, Inc.
Third Annual Report April 2013

UT3 (Photos 48 to 55)
Photo 48. Flowpath downstream into Lower Scott Creek swamp
from below the end of "constructed" UT3. Arrow shows feature
entrance shown in photo below. 27 June 2012.
Photo 49. Flowpath entrance taken from arrow in photo above.
Arrow here indicates direction of flow feature into swamp. 27 June
2012.
Hell Swamp /Scott Creek Mitigation Site B -70 PCS Phosphate Company, Inc.
Third Annual Report April 2013

Photo 50. Close to same location as Photo 49. 11 December 2012.
Photo 51. Downstream from UT3 -2B gauge, narrow flowpath with
some sorting and lack of vegetation. 27 June 2012.
Hell Swamp /Scott Creek Mitigation Site B -71 PCS Phosphate Company, Inc.
Third Annual Report April 2013

Photo 52. Close to same location as Photo 51. 11 December 2012.
Photo 53. Typical small wrack pile common between UT3 -2B and
UT3 -5B. 27 June 2012.
Hell Swamp /Scott Creek Mitigation Site B -72 PCS Phosphate Company, Inc.
Third Annual Report April 2013

Photo 54. Downstream from about 40 feet below UT3 -6B gauge,
wrack piles and stems oriented to flow direction. 27 June 2012.
Photo 55. Upstream view of potential flowpath observed between
UT3 -7 and UT3 -8. 11 December 2012.
Hell Swamp /Scott Creek Mitigation Site B -73 PCS Phosphate Company, Inc.
Third Annual Report April 2013

UT1 (Photos 56 to 58)
Photo 56. Downstream view of flowpath located at UT1 -1 B.
11 December 2012.
Photo 57. Flowpath lacking vegetation located at UT1 -313.
11 December 2012.
Hell Swamp /Scott Creek Mitigation Site B -74 PCS Phosphate Company, Inc.
Third Annual Report April 2013

Photo 58. Downstream view below UT1 -4B of bed and bank
formation within flowpath. 11 December 2012.
Hell Swamp /Scott Creek Mitigation Site B -75 PCS Phosphate Company, Inc.
Third Annual Report April 2013

APPENDIX C
Baseline and 2012 Stem Counts at Individual Plots at Hell Swamp

U
x
Q
m
{p
W
a
M
M
N
N
H
7
m
M
N
N
N
m
a
M
N
N
N
W
H
m
W
'a
M
H
m
N
r
a
M
N
N
M
M
N
H
m
N
a
M
N
N
N
V
H
7
m
N
N
M
N
M
V
r
m
M
a
M
H
7
J
m
m
a
M
N
N
N
V
H
7
J
m
m
N
a
M
N
N
M
M
N
H
7
J
m
m
'a
M
a
H
m
r
a
M
M
m
H
7
m
M
m
m
'a
M
r
v
M
H
m
M
a
M
N
N
N
H
m
N
N
M
N
M
N
M
V
H
7
m
M
M
M
M
V
N
m
M
'O
M
V
N
H
7
m
V
V
M
m
'O
M
r
N
V
H
m
a
M
N
V
V
M
V
v
N
7
J
m
M
V
V
M
V
m
W
a
M
N
M
M
V
v
y
7
J
m
N
M
M
V
m
N
E
M
N
V
V
O
v
N
7
J
m
N
V
V
(O
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APPENDIX D
Selected Third Annual (2012) Restoration Vegetation Photographs

The photos represent a range of conditions on the site. A 10 -ft pole marked with one -foot increments is in
each photo for a height reference. The third annual photos (bottom photos) are paired with the baseline
photo (top photo) from the same location.
UT6 -1 B photo station, view upstream. 16 July 2010.
UT6 -1 B photo station, view downstream. 14 November 2012.
Hell Swamp /Scott Creek Mitigation Site D -1 PCS Phosphate Company, Inc.
Third Annual Report April 2013

Well HS14 photo station, view to the north. 16 July 2010. White stakes mark the
location of planted stems.
Well HS14 photo station, view to the north. 14 November 2012.
Hell Swamp /Scott Creek Mitigation Site D -2 PCS Phosphate Company, Inc.
Third Annual Report April 2013

Well HS98 photo station, view to the west. 16 July 2010.
Well HS98 photo station, view to the west. 14 November 2012.
Hell Swamp /Scott Creek Mitigation Site D -3 PCS Phosphate Company, Inc.
Third Annual Report April 2013

r
Well HS37, view to the west. 16 July 2010.
Well HS37, view to the west. 14 November 2012.
Hell Swamp /Scott Creek Mitigation Site D -4 PCS Phosphate Company, Inc.
Third Annual Report April 2013

USC -2, view downstream. 16 July 2010.
USC -2, view downstream. 14 November 2012.
Hell Swamp /Scott Creek Mitigation Site D -5 PCS Phosphate Company, Inc.
Third Annual Report April 2013

UT2 -1, view to the north northwest. 16 July 2010.
UT2 -1, view to the north northwest. 14 November 2012.
Hell Swamp /Scott Creek Mitigation Site D -6 PCS Phosphate Company, Inc.
Third Annual Report April 2013

UT4 -1, view upstream (west). 16 July 2010.
UT4 -1, view upstream (west). 14 November 2012.
Hell Swamp /Scott Creek Mitigation Site D -7 PCS Phosphate Company, Inc.
Third Annual Report April 2013

UT7 -2, view upstream (north northeast). 14 July 2010.
UT7 -2, view upstream (north northeast). 14 November 2012.
Hell Swamp /Scott Creek Mitigation Site D -8 PCS Phosphate Company, Inc.
Third Annual Report April 2013