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Research Triangle Park Center
Surface Water Evaluation
Durham County, North Carolina
Prepared for:
Durham County
Engineering and Environmental Services Department
120 East Parrish Street
Law Building, 1st Floor
Durham, NC 27701
Prepared By:
Mulkey, Inc.
6750 Tryon Road
Cary, North Carolina 27518
Tel. (919) 851-1912 Fax (919) 851-1918
October 2014
Research Triangle Park Center October 2014
Research Triangle Park Center
October 2014
Surface Water Evaluation
Durham County, North Carolina
Purpose
The purpose of this evaluation is to provide information to the Durham County engineer
for use in making final decisions on the applicability of stream buffer protection
standards for the Research Triangle Park Center (Site). Stream buffer protection
standards have been adopted by Durham County to protect and maintain existing riparian
areas.
Under section 14-153(b) of the Durham County Ordinance, for proposed developments
outside of the Neuse River Basin, no proposed developments shall be approved which are
within the first 50 feet adjacent to a waterbody shown on the most recent United States
Geologic Survey (USGS) 7.5-minute quadrangle topographic map or the U.S.
Department of Agriculture (USDA) Soil Survey. Durham County has amended this
ordinance to provide a review of water bodies depicted on either the USGS topographic
map or USDA soil survey when an applicant does not believe they are intermittent or
perennial streams, or ponds or lakes that are manmade and are located outside of natural
drainage ways.
Under section 14-153(b), for these types of drainage features, personnel selected by the
County Engineer can perform a stream and surface water delineation. If the delineation
indicates that the drainage feature or depicted surface water is not subject to the buffer
protection standards, and is subsequently approved by the County Engineer, then the
proposed development may encroach within the first 50 feet adjacent to the waterbody
depicted on the soil survey and the topographic map. The present evaluation is a review
of the proposed Site. Surface waters depicted on the soil survey and topographic map
were evaluated on the Site for the applicability of buffer rules.
Project Description
The Site is located on 14 parcels of land totaling approximately 95.6 acres. The project is
bounded by I-40, NC 147, NC 54, and Davis Drive in Durham County, North Carolina
(Figure 1, Appendix A).
Methodology
Mulkey, Inc., (Mulkey) was contracted by the Durham County Engineering Department
to undertake an evaluation of the subject property. The County provided Mulkey with
the Site mapping that depicts the property boundaries. The County mapping consisted of
a copy of the county soil mapping and a USGS topographic map. Mulkey’s evaluation
consisted of a review of applicable mapping and a field investigation.
Research Triangle Park Center October 2014
Mapping resources reviewed by Mulkey included the most recent Southeast Durham
topographic map (1973), and the soil survey of Durham County (1976).
Mulkey conducted the field review on October 22, 2014. Mulkey reviewed and
evaluated all drainage features depicted from the county soil survey and USGS
topographic mapping in the field to determine the applicability of Durham County buffers
rules. The features in question were evaluated to determine if it met the criteria to be
considered at least an intermittent stream (Figure 2 and 3).
Field observations coupled with the NCDWQ Stream Identification Form (Version 4.11)
were used to determine the origin point and classification of the drainage features present
on the property. Using this form, the streams were evaluated based on three
characteristics: Geomorphology, Hydrology, and Biology. The identification of stream
type was “accomplished by evaluating 26 different attributes of the stream and assigning
a numeric score to each attribute.” These attributes are defined in the NC Division of
Water Quality (NCDWQ) Identification Methods for the Origins of Intermittent and
Perennial Streams (Version 4.11). According to these methods, a stream segment that
scores between 0 and <19 is considered an ephemeral stream, a stream segment that
scores between ≥19 and <30 is considered an intermittent stream, and a stream segment
that scores ≥30 is considered a perennial stream. A stream form was completed for the
mapped drainage feature within the property boundaries.
A total of nine stream features were depicted on soil survey and/or topographic mapping.
Of the nine features shown, five were found in the field and sixth stream. Additionally,
stream (B) was not depicted on either the soil survey and/or topographic mapping. All
stream features identified in the field are presented in Table 1 below. Photographs were
taken of potentially jurisdictional features found, and included in Appendix B. The
stream identification forms are included in Appendix C.
Table 1. Research Triangle Park Center Stream Table
Feature
ID
Findings in the
Field
NCDWQ
Score
Stream
Determination
Buffer
Applicable
A PRESENT 27.5 INTERMITTENT YES
B PRESENT 22 INTERMITTENT NO
C PRESENT 34 PERENNIAL YES
D PRESENT 21.5 INTERMITTENT YES
E PRESENT 30 PERENNIAL YES
G PRESENT 23 INTERMITTENT YES
W ABSENT N/A N/A NO
X ABSENT N/A N/A NO
Y ABSENT N/A N/A NO
Z ABSENT N/A N/A NO
Research Triangle Park Center October 2014
Qualifications
The key team member involved in this investigation is Brian Dustin. His qualifications
are listed below.
Brian Dustin, Environmental Scientist
Education: BS Forest Management, North Carolina State University
Experience: Mulkey Engineers & Consultants, May 2007 to present
H.W. Lochner, May 2003 – May 2007
Expertise: Wetland determination and delineation, stream determination and
delineation, stream restoration, natural community assessments, GPS/GIS
data collection, Rosgen stream assessment and classification.
NCDWQ Methodology for Identification of Streams Intermittent and
Perennial Streams Their Origins
Results
Streams A, D, and G are not depicted on the Southeast or Southwest Durham USGS
topographic quadrangle; however, they are shown on the county soil survey within the
designated study area. Steams C and E are shown on both the soil survey and USGS
topographic mapping. Stream B was not shown on either the soil survey or USGS
topographic mapping. Stream B is not subject to Durham County stream buffer
protection.
Summary
Based on field observation and data collection, features A, C, D, E, and G depicted on the
soil survey and/or USGS topographic mapping would be subject to Durham County
stream buffer protection standards.
Research Triangle Park Center October 2014
Appendix A
Figures
Proje ct Area Project Vicinity
Figure 1
Research Triangle Park CenterDurham, NC
Durham County, North Carolina
I 0 1,000500
Feet
Source:BING MapsFigure Date: 10/22/2014
Proje ct Vicin ity
0 700 1,400350Feet 2
TOPOGRAPHIC MAP
DURHAM COUNTY, NC
1 inch = 700 feetIGRAPHIC SCALE RESEARCH TRIANGLE PARK CENTER
Sources:TOPOGRAPHIC MAP: BING MAPS
B. DUSTIN
OCTOBER 22, 2014 INSERT
INSERT
This Exhibit is for planning purposes only and information shown hereon does notmeet NC 47-30 Requirements and therefore is not for design, construction, orrecording or transfer of title. The Exhibit was compiled from available informationobtained from the sources listed below. Streams and Wetlands: All featureslocated in the field were recorded using a mapping grade Trimble GeoXT orGeoXH GPS receiver with supposed sub-meter accuracy.
FIGUREFIELD VISIT 2
DATE:
CREW:
FIELD VISIT 1
CREW:
DATE:
Legend
RTP Center Study Area
FIGURE
3
This Exhibit is for planning purposes only and information shownhereon doe s not meet NC 47-30 Requirements and therefore is not fordesign, con struction, or recording or transfer of title. The Exhibit wascompiled from available information obtained from the sources listedbelow. Streams and Wetlands: All features located in the field wererecorded u sing a mapping grade Trimble GeoXT or GeoXH GPSreceiver with supposed sub-meter accuracy.
I
Sources:Soil Survey Data: USDA Soil Survey of Durham County
RTP Ce nter Study Area
C
X
W
Y
A
Z
B
D
E
G
DURHAM COUNTY SO IL SURVEYRESEARCH TRIANGLE PARK CENTERDURHAM CO UNTY, NC
Research Triangle Park Center October 2014
Appendix B
Site Photographs
RESEARCH TRIANGLE PARK CENTER
PHOTO LOG
STREAM A STREAM B
STREAM C STREAM D
STREAM E STREAM G
Research Triangle Park Center October 2014
Appendix C
Stream Identification Form
NC DWQ Stream Identification Form Version 4.11
Date: Project/Site: Latitude:
Evaluator: County: Longitude:
Total Points:
Stream Determination: Other:
e.g. Quad Name: Stream is at least intermittent if
19 or perennial if 30
A. Geomorphology (Subtotal = ) Absent Weak Moderate Strong SCORE
1a. Continuous bed and bank 0 1 2 3
2. Sinuosity of channel along thalweg 0 1 2 3
3. In-Channel structure: ex. riffle-pool, step-pool, ripple-
pool sequence 0 1 2 3
4. Particle size of stream substrate 0 1 2 3
5. Active/relic floodplain 0 1 2 3
6. Depositional bars or benches 0 1 2 3
7. Recent alluvial deposits 0 1 2 3
8. Headcuts 0 1 2 3
9. Grade controls 0 0.5 1 1.5
10. Natural valley 0 0.5 1 1.5
11. Second or greater order channel No = 0 Yes = 3
a artificial ditches are not rated; see discussions in manual.
B. Hydrology (Subtotal = ) Absent Weak Moderate Strong SCORE
12. Presence of Baseflow 0 1 2 3
13. Iron oxidizing bacteria 0 1 2 3
14. Leaflitter 1.5 1 0.5 0
15. Sediment on plants or debris 0 0.5 1 1.5
16. Organic debris lines or piles 0 0.5 1 1.5
17. Soil-based evidence of high water table? No = 0 Yes = 1.5
C. Biology (Subtotal = )
Absent Weak Moderate Strong SCORE
18. Fibrous roots in streambed 3 2 1 0
19. Rooted upland plants in streambed 3 2 1 0
20. Macrobenthos (note diversity and abundance) 0 1 2 3
21. Aquatic Mollusks 0 1 2 3
22. Fish 0 0.5 1 1.5
23. Crayfish 0 0.5 1 1.5
24. Amphibians 0 0.5 1 1.5
25. Algae 0 0.5 1 1.5
26. Wetland plants in streambed FACW=0.75; OBL=1.5 Other=0
*perennial stream may also be identified using other methods. See p.35 of manual.
Notes:
Bank Height (feet)
Bankfull Width (feet)
Water Depth (inches)
Channel Substrate
Velocity:
Clarity:
Sketch:
Oct 22, 2014
Brian Dustin, Mulkey,Inc.
27.5 Intermittent
19
3.5
5
3
3
2
1
2
1
1
1
1
3
0
0
0
0.5
1
1.5
1.5
2
3
0
0
0
0
0
0
0
Sand
N/A
N/A
3
4
0
Good geomorphology due to high concentrations of runoff from
Durham
35.898326
-78.874524
Southwest/east Durham
RTP/ Stream A
NC DWQ Stream Identification Form Version 4.11
Date: Project/Site: Latitude:
Evaluator: County: Longitude:
Total Points:
Stream Determination: Other:
e.g. Quad Name: Stream is at least intermittent if
19 or perennial if 30
A. Geomorphology (Subtotal = ) Absent Weak Moderate Strong SCORE
1a. Continuous bed and bank 0 1 2 3
2. Sinuosity of channel along thalweg 0 1 2 3
3. In-Channel structure: ex. riffle-pool, step-pool, ripple-
pool sequence 0 1 2 3
4. Particle size of stream substrate 0 1 2 3
5. Active/relic floodplain 0 1 2 3
6. Depositional bars or benches 0 1 2 3
7. Recent alluvial deposits 0 1 2 3
8. Headcuts 0 1 2 3
9. Grade controls 0 0.5 1 1.5
10. Natural valley 0 0.5 1 1.5
11. Second or greater order channel No = 0 Yes = 3
a artificial ditches are not rated; see discussions in manual.
B. Hydrology (Subtotal = ) Absent Weak Moderate Strong SCORE
12. Presence of Baseflow 0 1 2 3
13. Iron oxidizing bacteria 0 1 2 3
14. Leaflitter 1.5 1 0.5 0
15. Sediment on plants or debris 0 0.5 1 1.5
16. Organic debris lines or piles 0 0.5 1 1.5
17. Soil-based evidence of high water table? No = 0 Yes = 1.5
C. Biology (Subtotal = )
Absent Weak Moderate Strong SCORE
18. Fibrous roots in streambed 3 2 1 0
19. Rooted upland plants in streambed 3 2 1 0
20. Macrobenthos (note diversity and abundance) 0 1 2 3
21. Aquatic Mollusks 0 1 2 3
22. Fish 0 0.5 1 1.5
23. Crayfish 0 0.5 1 1.5
24. Amphibians 0 0.5 1 1.5
25. Algae 0 0.5 1 1.5
26. Wetland plants in streambed FACW=0.75; OBL=1.5 Other=0
*perennial stream may also be identified using other methods. See p.35 of manual.
Notes:
Bank Height (feet)
Bankfull Width (feet)
Water Depth (inches)
Channel Substrate
Velocity:
Clarity:
Sketch:
Oct 22, 2014
Brian Dustin, Mulkey,Inc.
22 Intermittent
15
2
5
3
2
2
1
2
1
1
1
1
0
0
0
0
0.5
1
1.5
0
2
3
0
0
0
0
0
0
0
Sand
N/A
N/A
3
2
0
Good geomorphology due to high concentrations of runoff from
Durham
35.898018
-78.874397
Southeast Durham
RTP/ Stream B
NC DWQ Stream Identification Form Version 4.11
Date: Project/Site: Latitude:
Evaluator: County: Longitude:
Total Points:
Stream Determination: Other:
e.g. Quad Name: Stream is at least intermittent if
19 or perennial if 30
A. Geomorphology (Subtotal = ) Absent Weak Moderate Strong SCORE
1a. Continuous bed and bank 0 1 2 3
2. Sinuosity of channel along thalweg 0 1 2 3
3. In-Channel structure: ex. riffle-pool, step-pool, ripple-
pool sequence 0 1 2 3
4. Particle size of stream substrate 0 1 2 3
5. Active/relic floodplain 0 1 2 3
6. Depositional bars or benches 0 1 2 3
7. Recent alluvial deposits 0 1 2 3
8. Headcuts 0 1 2 3
9. Grade controls 0 0.5 1 1.5
10. Natural valley 0 0.5 1 1.5
11. Second or greater order channel No = 0 Yes = 3
a artificial ditches are not rated; see discussions in manual.
B. Hydrology (Subtotal = ) Absent Weak Moderate Strong SCORE
12. Presence of Baseflow 0 1 2 3
13. Iron oxidizing bacteria 0 1 2 3
14. Leaflitter 1.5 1 0.5 0
15. Sediment on plants or debris 0 0.5 1 1.5
16. Organic debris lines or piles 0 0.5 1 1.5
17. Soil-based evidence of high water table? No = 0 Yes = 1.5
C. Biology (Subtotal = )
Absent Weak Moderate Strong SCORE
18. Fibrous roots in streambed 3 2 1 0
19. Rooted upland plants in streambed 3 2 1 0
20. Macrobenthos (note diversity and abundance) 0 1 2 3
21. Aquatic Mollusks 0 1 2 3
22. Fish 0 0.5 1 1.5
23. Crayfish 0 0.5 1 1.5
24. Amphibians 0 0.5 1 1.5
25. Algae 0 0.5 1 1.5
26. Wetland plants in streambed FACW=0.75; OBL=1.5 Other=0
*perennial stream may also be identified using other methods. See p.35 of manual.
Notes:
Bank Height (feet)
Bankfull Width (feet)
Water Depth (inches)
Channel Substrate
Velocity:
Clarity:
Sketch:
Oct 22, 2014
Brian Dustin, Mulkey,Inc.
34 Perennial
22.5
5.5
6
3
2
3
2
2
2
1
0.5
1
3
2
0
1
0.5
3
0.5
1.5
3
3
0
0
0
0
0
0
0
Sand/gravel/cobble
Moderate
Clear
3-4
6-8
4-6
Durham
35.896198
-78.866508
Southeast Durham
RTP/ Stream C
NC DWQ Stream Identification Form Version 4.11
Date: Project/Site: Latitude:
Evaluator: County: Longitude:
Total Points:
Stream Determination: Other:
e.g. Quad Name: Stream is at least intermittent if
19 or perennial if 30
A. Geomorphology (Subtotal = ) Absent Weak Moderate Strong SCORE
1a. Continuous bed and bank 0 1 2 3
2. Sinuosity of channel along thalweg 0 1 2 3
3. In-Channel structure: ex. riffle-pool, step-pool, ripple-
pool sequence 0 1 2 3
4. Particle size of stream substrate 0 1 2 3
5. Active/relic floodplain 0 1 2 3
6. Depositional bars or benches 0 1 2 3
7. Recent alluvial deposits 0 1 2 3
8. Headcuts 0 1 2 3
9. Grade controls 0 0.5 1 1.5
10. Natural valley 0 0.5 1 1.5
11. Second or greater order channel No = 0 Yes = 3
a artificial ditches are not rated; see discussions in manual.
B. Hydrology (Subtotal = ) Absent Weak Moderate Strong SCORE
12. Presence of Baseflow 0 1 2 3
13. Iron oxidizing bacteria 0 1 2 3
14. Leaflitter 1.5 1 0.5 0
15. Sediment on plants or debris 0 0.5 1 1.5
16. Organic debris lines or piles 0 0.5 1 1.5
17. Soil-based evidence of high water table? No = 0 Yes = 1.5
C. Biology (Subtotal = )
Absent Weak Moderate Strong SCORE
18. Fibrous roots in streambed 3 2 1 0
19. Rooted upland plants in streambed 3 2 1 0
20. Macrobenthos (note diversity and abundance) 0 1 2 3
21. Aquatic Mollusks 0 1 2 3
22. Fish 0 0.5 1 1.5
23. Crayfish 0 0.5 1 1.5
24. Amphibians 0 0.5 1 1.5
25. Algae 0 0.5 1 1.5
26. Wetland plants in streambed FACW=0.75; OBL=1.5 Other=0
*perennial stream may also be identified using other methods. See p.35 of manual.
Notes:
Bank Height (feet)
Bankfull Width (feet)
Water Depth (inches)
Channel Substrate
Velocity:
Clarity:
Sketch:
Oct 22, 2014
Brian Dustin, Mulkey,Inc.
21.5 Intermittent
12
3.5
6
3
1
0
2
1
1
1
1
1
0
1
0
0
0
1
1
1.5
3
3
0
0
0
0
0
0
0
Sand/rip rap
Slow
Clear
2
6
4-6
Stream D starts at culverts at end of parking lot. Culverts are dry inside. Water in rip rap channel has very little
movement.
Durham
35.895066
-78.869672
Southeast Durham
RTP/ Stream D
NC DWQ Stream Identification Form Version 4.11
Date: Project/Site: Latitude:
Evaluator: County: Longitude:
Total Points:
Stream Determination: Other:
e.g. Quad Name: Stream is at least intermittent if
19 or perennial if 30
A. Geomorphology (Subtotal = ) Absent Weak Moderate Strong SCORE
1a. Continuous bed and bank 0 1 2 3
2. Sinuosity of channel along thalweg 0 1 2 3
3. In-Channel structure: ex. riffle-pool, step-pool, ripple-
pool sequence 0 1 2 3
4. Particle size of stream substrate 0 1 2 3
5. Active/relic floodplain 0 1 2 3
6. Depositional bars or benches 0 1 2 3
7. Recent alluvial deposits 0 1 2 3
8. Headcuts 0 1 2 3
9. Grade controls 0 0.5 1 1.5
10. Natural valley 0 0.5 1 1.5
11. Second or greater order channel No = 0 Yes = 3
a artificial ditches are not rated; see discussions in manual.
B. Hydrology (Subtotal = ) Absent Weak Moderate Strong SCORE
12. Presence of Baseflow 0 1 2 3
13. Iron oxidizing bacteria 0 1 2 3
14. Leaflitter 1.5 1 0.5 0
15. Sediment on plants or debris 0 0.5 1 1.5
16. Organic debris lines or piles 0 0.5 1 1.5
17. Soil-based evidence of high water table? No = 0 Yes = 1.5
C. Biology (Subtotal = )
Absent Weak Moderate Strong SCORE
18. Fibrous roots in streambed 3 2 1 0
19. Rooted upland plants in streambed 3 2 1 0
20. Macrobenthos (note diversity and abundance) 0 1 2 3
21. Aquatic Mollusks 0 1 2 3
22. Fish 0 0.5 1 1.5
23. Crayfish 0 0.5 1 1.5
24. Amphibians 0 0.5 1 1.5
25. Algae 0 0.5 1 1.5
26. Wetland plants in streambed FACW=0.75; OBL=1.5 Other=0
*perennial stream may also be identified using other methods. See p.35 of manual.
Notes:
Bank Height (feet)
Bankfull Width (feet)
Water Depth (inches)
Channel Substrate
Velocity:
Clarity:
Sketch:
Oct 22, 2014
Brian Dustin, Mulkey,Inc.
30 Perennial
18.5
5.5
6
3
2
1
2
1
1
1
0.5
1
3
2
0
1
0.5
3
0.5
1.5
3
3
0
0
0
0
0
0
0
Sand/gravel/cobble
Moderate
Clear
3-4
6-8
2-4
Stream E is channelized a majority of it's length throughout the property.
Durham
35.894063
-78.863133
Southeast Durham
RTP/ Stream E
NC DWQ Stream Identification Form Version 4.11
Date: Project/Site: Latitude:
Evaluator: County: Longitude:
Total Points:
Stream Determination: Other:
e.g. Quad Name: Stream is at least intermittent if
19 or perennial if 30
A. Geomorphology (Subtotal = ) Absent Weak Moderate Strong SCORE
1a. Continuous bed and bank 0 1 2 3
2. Sinuosity of channel along thalweg 0 1 2 3
3. In-Channel structure: ex. riffle-pool, step-pool, ripple-
pool sequence 0 1 2 3
4. Particle size of stream substrate 0 1 2 3
5. Active/relic floodplain 0 1 2 3
6. Depositional bars or benches 0 1 2 3
7. Recent alluvial deposits 0 1 2 3
8. Headcuts 0 1 2 3
9. Grade controls 0 0.5 1 1.5
10. Natural valley 0 0.5 1 1.5
11. Second or greater order channel No = 0 Yes = 3
a artificial ditches are not rated; see discussions in manual.
B. Hydrology (Subtotal = ) Absent Weak Moderate Strong SCORE
12. Presence of Baseflow 0 1 2 3
13. Iron oxidizing bacteria 0 1 2 3
14. Leaflitter 1.5 1 0.5 0
15. Sediment on plants or debris 0 0.5 1 1.5
16. Organic debris lines or piles 0 0.5 1 1.5
17. Soil-based evidence of high water table? No = 0 Yes = 1.5
C. Biology (Subtotal = )
Absent Weak Moderate Strong SCORE
18. Fibrous roots in streambed 3 2 1 0
19. Rooted upland plants in streambed 3 2 1 0
20. Macrobenthos (note diversity and abundance) 0 1 2 3
21. Aquatic Mollusks 0 1 2 3
22. Fish 0 0.5 1 1.5
23. Crayfish 0 0.5 1 1.5
24. Amphibians 0 0.5 1 1.5
25. Algae 0 0.5 1 1.5
26. Wetland plants in streambed FACW=0.75; OBL=1.5 Other=0
*perennial stream may also be identified using other methods. See p.35 of manual.
Notes:
Bank Height (feet)
Bankfull Width (feet)
Water Depth (inches)
Channel Substrate
Velocity:
Clarity:
Sketch:
Oct 22, 2014
Brian Dustin, Mulkey,Inc.
23 Intermittent
15
2
6
3
2
2
1
2
1
1
1
1
0
0
0
0
0.5
1
1.5
0
3
3
0
0
0
0
0
0
0
Sand
N/A
N/A
3
2-3
0
Stream G appears to have been dug out long ago. only contains two small pools of water. Good geomorphology
due to high concentrations of runoff from surrounding parking lots.
Durham
35.898326
-78.874524
Southeast Durham
RTP/ Stream G