19980574 Ver 1_Complete File_20030505

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Town of Yadkinville Reservoir Mitigation Project
Yadkin County, North Carolina

Post '''''''ementation Inspection I Inidal Report~ >? ':j ~""

May I, 2003 ~\t.<- / -{'of ~'

~:'V'
~

Completed by:

Wetland and Natural Resource Consultants, Inc.
Post Office Box 224
II South College Avenue, Suite 203
Newton, North Carolina 28658

~

MEzANDs /401 GROtJp
MAY () 5 2003
WA1tROtJAu7ySECTroN

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:,... .;.:.,. .~.~

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POST IMPLEMENTATION INSPECTION I INITIAL REPORT
Town ofYadkinville Reservoir Mitigation Site
Yadkin County

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Table of Contents

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Table of Contents ... ...... ........ ... .... ................. ....... ............. ............... ...... ..... ..... .........2

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5 u m m ary .... ............. ............. ........ .............. .... ........... ... ..................... ............ ................. 3

I ntrod uction ...................... ............. ........... ..... ......................... ........... ... ...... ...................3

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I . I Project Oescri ption ............ ........................................................................... ........3

I .2 Purpose... ......... .............. ...................... ........................ .......................................... 3

1.3 Project History ...................... ............................... ................................. ................3

Figure I. Yadkinville Reservoir Mitigation Site location Map..............................4

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3.0 Vegetation: Yadkinville Reservoir Mitigation Site (Initial Planting) ...................
3.1

3.2 Description of 5 peci es ........... ................................................... ..........................

Total 3500 .............. ....................... ...... .................... ............................ .......... ............

I .4 Projected Schedu Ie ..... ..........................................................................................6

2.0 H yd rol ogy ......................... ......................................... ........... .................................... 6

2.1 Success Criteria ....................................................................................................6

2.2 Hydrologic Descri ption ................... ................. .... .................................. ... ...........7

Figure 2. Yadkinville Reservoir Mitigation Site As-built Maps............................. 8
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Photos - Yadkinville Mitigation Area March Flooding ................. 8
Photos - Yadkinville Mitigation Area April Flooding ................... 20
Photos - Yadkinville Mitigation Area.....,...................................... 23

So'i Is P rafi Ie Descri ptions ....... ..... ................................................... 29

Figure 3. Yadkin County, NC WETS Data ..........................................................

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5 u ccess C rite ri a ................ .................. ........................ ................... .....................

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3.3 Conel usio n 5 ................ ........... ....... ...... ...... ...................... ..... ......... .......... ... ..........

4.0 Soi I 5... ....... .................................................... .............................................. .............

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4. I 0 n-si te Soi I Con d itions................ ... .......... .............. .... ....... ..... ....... ....... ... ...........

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4.2 Hydric Soil Indicator Development...................................................................

Figure 4. Yadkin County, Soil Survey ...................................................................

Co ncl usi 0 n 5......... ......... ... .......... ................................ .......................... ................

5.0

Appendix A Weill Precipitation Data ................................................................

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Appendix B
Appendix C
Appendix 0
Appendix E

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Summary

Construction and grading of the Yadkinville Reservoir Mitigation Site located in Yadkin County
was completed in February 2003. Grading activities were designed to result in approximately 8
acres of wetland restoration I creation and buffer enhancement to approximately 2000 linear
feet of streams. In order to receive mitigation credit, the site must meet jurisdictional success
criteria for both wetland hydrology and vegetation for five consecutive years. This initial report
reflects, post implementation as-built descriptions of the mitigation site and outlines scheduled
monitoring activities.

Precipitation data collected from the Town of Yadkinville Water Treatment Plant located
immediately upstream of the mitigation site on South Deep Creek is to be utilized in
conjunction with a manual rain gauge located on the site. The manual gauge is used to validate
observations made at the water treatment plant. To date, both gauges confirm that above
normal rainfall has occurred since construction completion. Unusually high precipitation events
completely flooded the mitigation site on March 2 I and again on April 10 as illustrated in the
attached photographs. Widespread flooding was observed throughout the region and
specifically within the reference wetland.

Introduction

1.1 Project Description
The mitigation site is located within the floodplain of Deep South Creek below the Reservoir
site. This site was acquired by the Town after the issuance of the dam permits for the purpose
of conducting the mitigation efforts. The basic goals of the plan are to restore and expand
wetland hydrology, soils, and vegetation in the proposed mitigation area, to provide a buffer to
protect the create wetland, and to restore woody vegetation along riparian zones previously
disturbed by cattle. Groundwater monitoring wells and a rain gauge were installed in April
2003. This is the first year (2003) of monitoring for the site.

1.2 Purpose
Monitoring of the Yadkinville Reservoir Mitigation Site is required to demonstrate successful
mitigation. The success of a wetland site is based predominantly on federal guidelines for
wetland delineation and mitigation; these guidelines include minimum standards for hydrologic
conditions and vegetation survival. Both hydrologic and vegetation monitoring is to be
conducted throughout the growing season; success criteria must be met for five consecutive
years. The following report details the results of the hydrologic and vegetation monitoring to
date for the Mitigation Site.

1,3 Project History
February 2003 Grading and Construction Completed
March 2003 Site planted
April 2003 Monitoring Wells I Rain Gauge Installed
April 2003 As-Built Details I Initial Monitoring Report Prepared

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Figure I. Yadkinville Reservoir Mitigation Site Location Map

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Name: LONE HICKORY
Date: 4/22/2003
Scale: 1 inch equals 2000 feet

Location: 0360 06' 35.8" N 0800 39' 05.5" W
Caption: Town ofYadkinville, Reservoir Mitigation Site
Yadkin County, NC

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Copyright (C) 1997, Maptech, Ine,

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sessment

nnua egetation,
Soils, and Hydrology
Monitoring

2.0 Hydrology

1.4 Projected Schedule

ocumentation

uy-
September DWQ.
(years 2004
- 2007)

2.1 Success Criteria
In accordance with federal guidelines for wetland mitigation. the success criteria for hydrology
states that areas must be inundated or saturated (within 12 inches of the surface) by surface or
groundwater for at least a consecutive 12.5% of the growing season. Areas inundated for less
than 5% of the growing season are always classified as non-wetlands. Areas inundated
continuously between 5% and 12.5% of the growing season can be classified as wetlands
depending upon such factors as the presence of wetland vegetation and hydric soils.

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The growing season in Yadkin County begins on April 5th and ends October 26th, lasting 205
days. These dates correspond to a 50% probability that air temperatures will not drop below
28F or lower after April 5th and before October 26th. Targeted wetland hydrology is 12.5% of
this growing season; for Yadkin County, this 12.5% equals 25 consecutive days. In instances,
minimum wetland hydrology is present when areas are continuously saturated or inundated for
at least 5% of this growing season or 10 consecutive days. In order for the hydrologic data to
be considered successful it must demonstrate wetland conditions are present in normal or
dryer than normal conditions. WETS Station data at Yadkinvi//e 6 E, NC96 75 will be utilized to
determine normal precipitation amounts.

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2.2 Hydrologic Description
In accordance with the approved mitigation plan, five manual groundwater monitoring wells and
one rain gauge were installed on April 2, 2003 for collecting site data hydrologic data. Readings
of the groundwater table depths at each well location are to be taken every other day beginning
at the start of the growing season until targeted wetland hydrology is met. Once at least 25
consecutive days of inundation or saturation to within 12 inches of the ground surface is
achieved, readings will be taken once a week for the remainder of the growing season, and
once a month outside of the growing season. The rainfall data used to analyze the site's water
level data is from both offsite and onsite rain gauges.

During site visits in March and April 2003, evidence of surface inundation was observed
throughout the monitored restoration area with significant flooding primarily from South Deep
Creek. The initial flooding event occurred four days after the trees on site were planted. The
rock I clay dike berms were temporarily lowered to allow for drainage in order to allow the
trees to better establish themselves. The outlet structures were raised after the flooding
event in April in order to prolong saturation with 12 inches of the ground surface into the
growing season.

Hydrology throughout the wetland mitigation area is expected to range from saturation within
12 inches of the soil surface for 12.5% of the growing season to several small pockets (less than
1/10 acre) that may potentially have permanent to semi-permanent inundation from 0 to J 2
inches above the soil surface. This variability in wetland hydrology is likely to produce
preferable diversity in aquatic habitat and vegetative communities.

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Figure 2. Yadkinville Reservoir Mitigation Site As-built Maps

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Town of Yadkinville,
Reservoir Mitigation Project Map

Key:

Wetland and Natural Resource Consultants, Inc.
Map illustrates approximated areas and locations using GPS
and aerial photo data. All mapping and wedand assessments
to be verified by US Army Corps and NC DWQ.

. Well (n) Well Location / Number
o P(n) Photo Location / Number
l\" . " . " " ") Wetland Restoration / Creation Area
~ " ~ Stream Buffers

Scale: I inch = 100 feet

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Berm / Subsurface Clay Dike
Area to be Planted / Replanted

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Figure 3. Yadkin County, NC WETS Data

NC9675 Creation Date: 10/23/2002
08031 Elevation: 860
County Name: Yadkin

WETS Station : YADKINVILLE 6 E,
Latitude: 3608 Longitude:
State FIPS/County(FIPS): 37197
Start yr. - 1971 End yr. - 2000

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I Temperature 1 Precipitation 1
I (Degrees F.) I (Inches) I

1-----------------------1--------------------------------------1

I 1 1 I 1 30% chance lavg I I
I 1 1 I I will have 1# ofl avg I
1-------1-------1-------1 I-----------------Idaysl totall
I avg I avg I avg I avg I less I more Iw/.11 snow I
I daily I daily I I I than I than I orl fall I
1 max 1 min I I I I I more I I

-------------------------------------------------------------------------1

January I 48.91 27.0 I 38.0 I 3.89 I 2.87 I 4.78 I 71 3.9 I
February I 53.9 I 29.1 I 41.5 I 3.49 I 2.49 I 4.38 I 61 3.0 I
March I 62.8 I 36.2 I 49.5 I 4.66 I 3.181 5.581 7 I 1.2 I
April I 72.2 I 43.2 I 57.7 I 3.56 I 2.36 1 4.69 I 6 I 0.0 I
May 1 78.9 I 52.4 I 65.6 I 4.31 I 2.87 I 5.251 71 0.01
June I 85.4 I 60.7 1 73.0 I 3.93 I 3.51 1 5.21 I 7 1 0.0 1
July I 89.0 1 64.8 I 76.9 I 4.10 I 3.01 I 5.07 I 7 I 0.0 I
August I 87.5 I 63.5 I 75.51 3.33 I 2.39 I 4.08 I 5 I 0.0 I
September I 81.5 I 57.2 I 69.3 I 4.00 I 2.47 1 5.29 1 5 I 0.0 I
October I 72.1 I 44.6 I 58.3 1 3.69 I 1. 97 I 4.45 1 4 1 0.0 I
November I 61. 5 I 36.2 I 48.9 I 3.13 I 2.29 1 3.54 1 5 I 0.0 I
December 1 51.9 1 29.4 1 40.6 I 3.54 J 2.30 1 4.43 I 6 I 1.1 I

----------1-------1-------1-------1--------1--------1--------1----1------1

----------1-------1-------1-------1--------1--------1--------1----1------1

Annual I ----- I ----- I ----- I ------ I 41.84 I 49.46 1 -- I ---- I

----------1-------1-------1-------1--------1--------1--------1----1------1

Average 1 70.5 1 45.4 1 57.9 I ------ I ------ I ------ I -- 1 ---- I

----------1-------1-------1-------1--------1--------1--------1----1------1

Total I ----- I ----- 1 ----- I 45.63 1 ------ I ------ I 72 I 9.2 1

----------1-------1-------1-------1--------1--------1--------1----1------1

-------------------------------------------------------------------------1

Month

GROWING SEASON DATES

I Temperature

---------------------1-----------------------------------------------------

Probability I 24 F or higher 1 28 F or higher I 32 F or higher I

---------------------1-----------------1-----------------1-----------------

1 Beginning and Ending Dates
1 Growing Season Length
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50 percent * 1
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1
70 percent * 1
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3/19 to 11/11
237 days

4/19 to 10/18
182 days

4/ 5 to 10/26
205 days

3/14 to 11/16
247 days

4/15 to 10/22
189 days

4/ 1 to 10/31
213 days

---------------------------------------------------------------------------

* Percent chance of the growing season occurring between the Beginning
and Ending dates.

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3.0 Vegetation: Yadkinville Reservoir Mitigation Site (Initial Planting)

3.1 Success Criteria
Trees were planted at roughly 10 feet by 10 feet spacing, or approximately 440 trees per acre.
No shrubs or herbaceous species were planted since a forested wetland is targeted. The
plantings were completed by March 15, 2003 with the exception of approximately 2 acres due
to a tree shortage by the Forest Service, and additional plantings needed for those areas
severely washed during the recent flooding events. Additional trees are currently being
ordered for completion of the plantings as shown on the attached map (figure 2).

Tree species were extremely limited at the time tree orders were made. The following tree
species were planted in the Wetland Restoration and Stream Buffer Areas based primarily on
availability. Additional trees will be comprised of alternate hardwood wetland species to
increase diversity if available. Survival rates will be considered acceptable if survival equals or
exceeds 85 percent of planted trees.

3.2 Description of Species

Delivered Species Common Name Fac Status Delivered #'s
Quercus phellos willow oak facw- 700
Quercus pagoda(olia cherrybark oak fac+ 700
Diospyros virginian a persimmon fac 700
Quercus lauri(olia laurel oak facw 500
Fraxinus pennsylvanica green ash facw 500
Nyssa sylvatica blackgum obi 200
Quercus nigra water oak fac 200
Total 3500

3.3 Conclusions
Initial observations have revealed that the almost all trees planted have survived the recent
flooding events with the exception of those that were literally washed away. We anticipate
acceptable survival rates at the end of the first growing season.

4.0 Soils

4.1 On-site Soil Conditions

Soils within the wetland mitigation area are mapped in the Yadkin County Soil Survey as Mixed
alluvial land, poorly drained (Mm) and Congaree fine sandy loam (Cr). The Congaree series soils
are located adjacent to Deep South Creek along the northern portion of the mitigation area.
The mixed alluvial soils located from the Congaree soils to the toe of slopes to the south of
Deep South Creek would typically be mapped as Chewacla and Wehadkee soil series.
Construction of the mitigation area involved the removal of the upper A or A I horizon (fescue
sod layers) and 6 to 18 inches of the Bw horizons, primarliy within the areas mapped as
Congaree. Topsoil was then replaced across the mitigation area to assist in the establishment
of planted trees.

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4.2 Hydric Soil Indicator Development

Soil profile descriptions are included in Appendix E at each well location. We anticipate that
soils within the wetland mitigation area that have matrix colors of chroma 3 will reduce rapidly
to chroma 2 or less within the surface horizons due to increased inundation and saturation.
Additional indicators of hydric soils and wetland hydrology such as sulfidic odor, redoximorphic
features, and oxidized rhizospheres are expected to develop quickly. The upper 16 inches of
the soil surface will be observed and described at the end of each growing season to document
the progression of hydric soil indicators.

Concern with lateral subsurface drainage within coarse textured soils adjacent to Deep South
Creek was addressed by extending the subsurface clay dike along the northern boundary of the
wetland area. This dike was tied into gleyed, clay loam soils located deep within the soil profile
in order to impede lateral subsurface drainage to Deep South Creek.

Figure 4. Yadkin County, Soil Survey

5.0 Conclusions

. Initial vegetation observations have shown that suitable survival rates to date have been
achieved.
. Initial hydrologic monitoring has shown that suitable minimum wetland hydrology
criteria can likely be achieved without utilizing supplemental sources. once outlet
structure elevations have been adjusted.
. Hydric soil characteristics and indicators are either present, or will likely form rapidly
due to the increased hydrology.
. Monitoring of vegetation and groundwater levels will continue with a I st annual
monitoring report following the 2003 growing season.

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Appendix A Weill Precipitation Data

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I Appendix A.2 Weill Precipitation Charts
Rainfall
I Date Well 1 Well 2 Well 3 Well 4 Well 5 (in)
4/2/03 -6,75 -2 -11.25 -7,75 -8
I 4/4/03 -5,5 -8,75 -15,25 -10.5 -7.25
4/5/03 0.1
4/6/03 -7,25 -8,25 -9 -3.5 -12.5
I ' 417/03 1.4
4/8/03 1,25 -7.5 -6.25 0.75 -7,5 1
4/10/03 6 6 6 6 6 1,5
I 4/12/03 -2.5 0,25 -6,25 1 -6,25
4/14/03 -2.5 -3.5 -8 3 -8.5
4/16/03 -3.5 -4.25 -9.5 5.25 -10,5
I 4/18/03 -0.5 -4.5 -7 4,5 -4 1.1
4/19/03 0.9
4/20/03 5 -2 -3 5 -6
I 4/22/03 1 -3 -6.5 4,5 -6,75
4/24/03 -1 -5.5 -11.25 5.5 -6.75
4/26/03 -2 -5,25 -8 5,5 -2,5
I 4/28/03 -0,75 -8.25 -10,25 6,5 -5,25
4/30/03 0.25 -3.75 -11.5 5.75 -8
I (well readings are in inches from soil surface. rainfall in inches)
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Appendix A.3 Precipitation Graph

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:1 Appendix B Photos - Yadkinville Mitigation Area March Flooding
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Appendix C Photos - Yadkinville Mitigation Area April Flooding

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Appendix 0 Photos - Yadkinville Mitigation Area

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Appendix E Soils Profile Descriptions

Location - Well I

Horizon Depth (in) Matrix Color Mottles Mottle Abundance / Contrast Texture
Fill (Ap) 0-3 10YR 6/3 loam
Bwgl 3-8 10YR 6/3 10YR 4/2 ommon / distinct loam
Bwg2 8-22 10YR 7/2 10YR 5/3 ew / distinct silt loam with black concretions
7.5YR 5/6 common / prominent
CI 22-32 10YR 6/1 7.5YR 5/6 ommon / prominent sandy clay loam
C2 32-42+ 10YR 6/1 7.5YR 5/6 clay loam

Location - Well 2

Horizon Depth (in) Matrix Color Mottles Mottle Abundance / Contrast rr exture
Fill (Ap) 0-4 10YR 6/3 loam
Btl 4-16 10YR 6/3 10YR 3/2 ~ommon / faint ~Iay loam
5YR 4/6 ~ommon / distinct
Bwg2 16-24 10YR 7/2 10YR 5/3 ~ommon / distinct ~Iay loam
7.5YR 5/6 ~ommon / distinct
CI 24-30 10YR 7/2 10YR 5/3 'few / distinct sandy loam
7.5YR 5/6 ~ommon / prominent
C2 30-42+ 10YR 6/1 5YR 4/6 ~ommon / prominent ~Iay loam

Location - Well 3

Horizon Depth (in) Matrix Color Mottles Mottle Abundance / Contrast rr exture
Fill (Ap) 0-7 10YR 5/4 loam
Btl 7-24 10YR 6/3 5YR 4/6 ~ommon / distinct ~Iay loam
Bwg2 24-35 10YR 6/3 10YR 7/2 ew / distinct ~i1t loam with black concretions
C 35-42+ 7.5YR 5/1 7.5YR 5/2 ~ommon / faint ~Iay loam

Location - Well 4

Horizon Depth (in) Matrix Color Mottles Mottle Abundance / Contrast ir exture
Fill (Ap) 0-6 7.5YR 5/4 loam
Bwl 6-12 7.5YR 5/3 7.5YR 4/6 ~ommon / distinct ~andy loam
CI 12-18 Mottled 10YR 6/2 !Common / distinct loamy sand
7.5YR 5/3 !Common / distinct
C2 18-24 10YR 7/1 7.5YR 5/4 ~ommon / prominent ~andy loam
C3 24-42+ Mottled 10YR 5/2 !Common / distinct ~Iay loam
10YR 7/2 ~ommon / distinct
10YR 6/1 !Common / prominent

Location - Well 5

Horizon Depth (in) Matrix Color Mottles Mottle Abundance / Contrast irexture
Fill (Ap) 0-8 7.5YR 5/4 oarn
Bwgl 8-11 10YR 7/2 7.5YR 5/4 ~ommon / distinct ~Iay loam
Bwg2 11-24 10YR 6/1 7.5YR 5/4 !Common / distinct ~i1t loam with black concretions
C 24-42+ 10YR 6/1 7.5YR 5/6 ~ommon / distinct ~Iay loam

29