19930128 Ver 1_Complete File_19940101

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y.
WATER QUALITY POND
and
WETLAND FILL
PROJECT COMPLETION
DOCUMENTATION
IMPERIAL CENTER
DURHAM, NORTH CAROLINA
JOB CODE: ICWQP1 & ICWFF
DATE: 28 OCTOBER 1996
ENVIROTEK INC
1111 OBERL IN ROAD
RALEIGH NC 27605 USA
architects engineers planners
TELEPHONE [phone]
TELEFAX 919 839 2255

ICWQP1 28 Oct 1997 Page 1
INDEX
RECEIVED
NUV b 1997
INTRODUCTION
EWIRONMENTAtSUENCES
PROJECT HISTORY
METHODOLOGY
DESIGN VERIFICATION
APPENDIX A
(2 June 1994 Design Calculations)
APPENDIX B
(Revised Water Quality Calculations)
APPENDIX C
(Revised Emergency Drain Routing)
APPENDIX D
(Dam Hazard Classification Documents)
APPENDIX E
(Wetland Fill Approval Documents)
APPENDIX F
(Wetland Mitigation Plan)
ATTACHMENT NO. 1
(Wetland Delineation Map Approved by Corps 25 September 1992)
ATTACHMENT NO. 2
(Water Quality Pond As-Built Plan, Dwg SM-1)
ATTACHMENT NO. 3
(Water Quality Pond Planting Plan: Dwg SM-1A; Planting Plan: Dwg SM-1B)

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WATER QUALITY POND AND WETLAND FILL
IMPERIAL CENTER
DURHAM, NORTH CAROLINA
PROJECT COMPLETION DOCUMENTATION
Introduction
ICWQP1 28 Oct 1997 Page 2
This report has been prepared to document completion of the Water Quality Pond and
Wetland Fill projects at Imperial Center in Durham, North Carolina. It also verifies
compliance with the design concepts for the Water Quality Pond and the Wetland Fill
projects.
Project History
Imperial Center, located adjacent to Research Triangle Park in Durham, North Carolina, is
a 425 acre mixed use commercial, office and industrial development. At the time these
projects were instituted, approximately 42% of the total land area had been developed.
' Portions of the remaining undeveloped land had been identified as jurisdictional wetlands.
The boundaries of these areas were flagged and verified by the Corps of Engineers. On
' September 25, 1992, an overall plan delineating existing jurisdictional wetlands was approved
by the Corps of Engineers.
' Subsequently, a wetland fill plan was prepared and approved by the Corps of Engineers, NC
DEHNR, NC DEM and the City of Durham. Construction of the water quality pond was
proposed to mitigate wetland filling and to meet local (Durham) water quality/quantity
criteria for developing the remaining portions of Imperial Center.
Methodology
The Water Quality Pond was required to meet rigorous design standards. This report
provides an analysis of the as-constructed pond to verify changes during construction meet
design assumptions. The wetland fill permit added additional requirements to the Water
' Quality Pond construction. This report also verifies these requirements have been met. An
as-constructed plan is attached for reference. Relevant applications, copies of design
calculations and letters of approval are included in the appendices for reference.

ICWQPI 28 Oct 1997 Page 3
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DESIGN VERIFICATION
PERMANENT POOL
REQUIRED AREA = 2.96 Acres (See Appendix A, Page 2)
AREA PROVIDED = 3.46 Acres (See Attachment No. 1, As-Built Plan)
PERMANENT POOL SURFACE AREA MEETS DESIGN GUIDELINES.
TEMPORARY POOL
Required Temporary Storage Volume = 4.51 Acre-Ft. (See Appendix A, Page 2)
Temporary Storage Volume Provided = 5.51 Acre-Ft. (See Attachment No. 1, As-Built Plan)
TEMPORARY STORAGE VOLUME MEETS DESIGN GUIDELINES.
WATER QUALITY DISCHARGE TIME
Required Water Quality discharge time: 48 to 120 hours
Design Discharge Time = ± 75 hours
(See Appendix A - Water Quality Routing dated 5 May 1994)
As-Built Water Quality Discharge Time = ± 60 hours
(See Appendix B - Water Quality Routing dated 21 October 1997)
WATER QUALITY POND DISCHARGE TIME MEETS DESIGN GUIDELINES.
EMERGENCY DRAIN DISCHARGE TIME
Required emergency discharge time: 24 hours or less
Design Discharge Time: ±29 hours
(See Appendix A - Emergency Drain Routing dated 5 May 1994)
As-Built emergency drain routing time: ± 14 hours
(See Appendix C - Emergency Drain Routing dated 21 October 1997)
EMERGENCY DRAIN DISCHARGE TIME MEETS DESIGN GUIDELINES.

' ICWQP1 28 Oct 1997 Page 4
' SEDIMENT STORAGE
Projected Sediment Loading: 162,370 lb/yr (±81 CY/yr)
' [see Appendix A, Page 3]
Available Sediment Storage:
(6128 CF + 48,828 CF + 133,683 CF + 244,563 CF)/27 = 15,933 CY
[see Attachment No. 2; As-Built Plan]

Imo,
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Proposed Maintenance Schedule: Clean pond on 20 year cycle; restore sediment storage
capacity by removing _L1600 CY (Note: 15,933 CY = ± 196 yr. storage capacity)
STORAGE CAPACITY MEETS DESIGN GUIDELINES
WETLAND FILL PERMIT
SURFACE AREA
Neither Corps nor DEM authorization specified surface area requirements for the Water
Quality Pond. However, the 3.94 acre temporary pool exceeds both the 3.487 acres of
wetland authorized to be filled and the 3.309 acres actually filled as part of the Wetland Fill
Project.
LITTORAL SHELF
The 25 Jan 1994 DEM approval stipulated the littoral shelf should be planted with emergent
wetland species. The 12 Dec 1997 approval for filling an additional 0.10 acres of wetland
required an additional 0.10 acres of the pond be planted with emergent wetland species.
Drawing No. SM-1A (attachment 3) provides a calculation of the required littoral shelf area
and indicates the areas to be planted. Drawing No. SM-1B (Attachment 3) shows the
proposed planting plan.
W.Q. POND PLANTINGS MEET DEM APPROVAL REQUIREMENTS FOR 401 WATER
QUALITY CERTIFICATIONS

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APPENDIX A
DESIGN CALCULATIONS
(29 JUNE 1994)
WATER QUALITY POND
AND
WETLAND FILL
PROJECT COMPLETION DOCUMENTATION
22 OCTOBER 1997
ICWQPI 28 Oct 1997 Page 5
IMPERIAL CENTER - WATER QUALITY POND NO. 1
DESIGN CALCULATIONS
' ENVIROTEK JOB: ICWQPI
29 JUNE 1994
i HYDROLOGIC CHARACTERISTICS
' 0100z 1036 CFS (SEE HEC-1 RUN DATED 3/29/94)
NOTE: DAM SAFETY LAW REQUIRES ONLY 25 YEAR SPILLWAY CAPACITY FOR CLASS A DAMS.
SPILLWAY DESIGN IS BASED ON 100 YEAR FLOW AS RECOMMENDED BY NCDEHNR
' HYDRAULIC CHARACTERISTICS
WATER QUALITY DISCHARGE TIME = :75 HRS
(SEE WATER QUALITY ROUTING DATED 5/5/94)
EMERGENCY DRAIN DISCHARGE TIME = :29 HRS
' (SEE EMERGENCY DRAIN ROUTING DATED 5/5/94)
SPILLWAY CHARACTERISTICS
' SPILLWAY ELEV = 331.50 (SEE PLANS)
SPILLWAY TOP = 335.00 (SEE PLANS)
' SPILLWAY LENGTH = 80' (SEE PLANS)
DEPTH OF FLOW: 0=3.33 (L-0.2H)H1.s
H = 2.48' (100 YR)
WATER SURFACE ELEV = 333.98 (100 YR)
FREEBOARD = 335.00-333.98 = 1.02' (OK)
' V=Q/A = 1036 CFS/(80'X2.48') = 5.22 FPS
CHECK DEPTH OF FLOW AT THROAT OF SPILLWAY
' BEHIND SPILLWAY: HGL = 331.50+2.48' = 334.98
AT THROAT: ELEV = 323.5; WIDTH =20'
NEGLECT LOSSES (CONSERVATIVE)
HGL=334.98 = 323.5+D+[1036/20 DJ22/(2X32.2)
D=2.25'; V=23.0 FPS; V2/2g=8.2'
STILLING BASIN
OUTFLOW ELEV = 320.0
EQUIVALENT PIPE DIAMETER (45 SF) = 7.57'
SCOUR DEPTH: 320.0-8.2' = 311.8 (311.3 OK)
' ICWQPI Imperial Center Water Quality Pond No. 1 14 July 1994
o Design Calculations EFS:eyb Page 1
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STRUCTURE & DRAIN BOUYANCY
RCP: 'B' WALL = 315 LB/FT
BOUYANCY = [PI/4](30.5/12)2(1')(62.4 PCF)=316.6 LB/FT
RCP 'C' WALL = 365 LF/FT
BOUYANCY = [PI/4](31.5/12)2(62.4)=337.7 LB/FT (OIn
STRUCTURE
'C' WALL (31.5' MIN O.D.) REQUIRED
EGLECT EFFECT OF BASE (NEGATIVE BOUYANCY MUST BE IN COMPRESSION)
OUYANCY FORCE = 1,146 LB/VF
,ARREL SECTION = 1104 LB/VF (5' WALLS)
1' FLAT TOP SLAB = 2090 LB
OF STRUCTURE = 6.5' + TOP
OF STRUCTURE _ (6.5') (1104 LB)+2090 LB = 9,266 LB
IBOUYANCY FORCE = (7.42')(1,146 LB/VF)=8,496 LB (OK)
NOTE: WEIGHT OF EXTENDED BASE & CONTROL VALVE ADD ADDITIONAL SAFETY MARGIN.
ATER QUALITY CONTROL - PHASE 1
PERMANENT POOL
DRAINAGE AREA = :475 AC
AVERAGE PERMANENT POOL DEPTH = 5.5' (ELEV 330.00)
FOR 25% IMPERVIOUS AREA & 85% POLLUTANT REMOVAL EFFICIENT: SA/DA = 0.623%
SAREQ = 0.00623 X 475 AC = 2.96 AC
SAPROVIDED = 2.96 AC (OK) R E C?' IJ 5 U R ?s1 G A R >= A
TEMPORARY POOL
RV (RUNOFF VOLUME) = r * A/12 AC-FT
r = STORM RUNOFF (in)
A = WATERSHED AREA TREATED
(T.R. SCHUELER, 'CONTROLLING URBAN RUNOFF,' 1987)
r= p*R„
p = 1 in (STORM RAINFALL)
R„ = RUNOFF COEFFICIENT (T.R. SCHUELER, 1987)
Rv = 0.05 + 0.009 p)
1 = PERCENT OF IMPERVIOUSNESS
Rv = 0.05 + 0.009 (18.95) = .221
r= 1 in *.221 =.221 in
A = 245 AC (425 AC - 180 AC)
Rv _ .221 in * 245 AC/12 in = 4.51 AC-ft orz D S To
p? Cs
?m I OP1 Imperial Center Water Ouality Pond No. 1 14 July 1994
o Design Calculations EFS:eyb Page 2
II

FROM STAGE STORAGE CALCULATION:
DEPTH REQUIRED = (4.51 AC - FT)(4.3560 FT3/ACRE1 = 0.48'
409,500 /2'
DEPTH PROVIDED = 1.50' (OK)
STORAGE POOL
L = (P*P1*R„/12)*C*A*2.72 (SCHUELER, 1987)
P = 42 in/yr (NCDNRCD, DEM)
P = 0.9 (SCHUELER, 1987)
k? = .221 (SEE ABOVE)
C = 350 mg/I (SCHUELER, 1987)
A = 245 AC
L = 162,370 LB/YR
ASSUMING 1 TON OF SEDIMENT IS APPROXIMATELY ICY & A DESIGN LIFE OF 20 YEARS
SEDIMENT VOLUMEreq. = 1,624 CY
FROM ST STORAGE CALCULATION:

STORAGE DEPTH = 1,624X 27 C.F. (2') = 0.37' (OKI
119,712 C.F.
I ?j
r? I P1 knperial Center Water Duality Pond No. 1 14 July 1994
o Design Calculations EFS:eyb Page 3
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I I * I I s I A I I A I a A 2 1 a I t 2 A k I I a I I a a I a a & I a I I I I I :
' FLOOD HYDROGRAPH PACIAGE (HEC-1) '
FEBRUARY 1981 `
REVISED 01 JUN 88 '
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' RUN DATE 03/29/1994 TIME 07:03:43 '
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' U.S. ARMY CORPS OF ENGINEERS •
' THE HYDROLOGIC ENGINEERING CENTER '
' 609 SECOND STREET '
DAVIS, CALIFORNIA 95616 '
' [phone]
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I I I I I IY
I I X I X
IIIIIII IIIX X IIIII I
I I I X X
I I I I I I
I I IIIIILX XXIII XXI

THIS PROGRAM REPLACES ALL PREVIOUS V3RSIONS OF HEC-I KYOWN AS HEC1 (JAN 73), HECIGS, HECIDB, AID HECIIM.
THE DEFINITIONS OF VARIABLES -RTIMP- AID -RTIOR- HAVE CHANGED FROM THOSE USED WITH THE 1973-STYLE INPUT STRUCTURE.
THE DEFINITION OF -0311- ON RM-CARD WAS CHANGED WITH REVISIONS DATED 28 SEP 81. THIS IS THE FORTRAJ77 VERSION
NEW OPTIONS: DAMBREAK OUTFLOW SUBMERGENCE , SINGLE EVENT DAMAGE CALCULATION, DSS:WRITE STAGE FREQUENCY,
DSS:R?AD TIME SERIES AT DESIRED CALCULATION INTERVAL LOSS RATE:GREBN AND AMPT INFILTRATION
KINEMATIC WAVE: NEW FINITE DIFFERENCE ALGORITHM
u

0

HYDROGRAPH AT STATION SUBI
............. ...... .... .................. ...... ...
DA NON HRMN ORD RAIN LOSS EXCESS CORP Q ' DA RON HRMR ORD RAIN LOSS EXCESS CORP
Q
I 0000 I .00 .00 .00 0. 1 0630 51 1.39 .06 1.37 345.
1 0010 2 .01 .01 .01 0. ' 1 0840 53 .43 .01 .42 454.
1 0020 3 .01 .01 .O1 1. ' 1 0850 54 .24 .01 .23 591.
' 1 0030 4 .01 .01 .O1 1. ' 1 0900 55 .24 .O1 .23 751.
I 0040 5 .02 .01 .01 3. 1 0910 56 .21 .01 .20 898.
1 0050 6 .02 .O1 .01 4. ' 1 0920 57 .19 .00 .18 995.
I 0100 7 OI O1 O1 7. ' 1 0930 58 .09 .00 .09 1040.
1 0110 8 .02 .O1 .01 9. ' 1 0940 59 .08 .00 .08 1039.
1 0120 9 .02 .01 .O1 11. ' 1 0950 60 .07 .00 .07 995.
I 0130 10 .02 .01 .O1 14. 1 1000 61 .07 .00 .07 913.
1 0140 11 .02 .O1 .01 16. ' 1 1010 62 .06 .00 .06 815.
1 0150 11 .02 .01 .01 17. ' 1 1020 63 .06 .00 .06 718.
1 0200 IJ .02 .O1 .01 19. ' 1 1030 64 .06 .00 .06 625.
1 0210 14 .02 .01 .01 20. ' 1 1040 65 .05 .00 .05 545.
1 0120 15 .O2 .01 .01 21. ' 1 1050 66 .05 .00 .05 476.
' 1
1 0231
0240 16
17 .02
.02 .11
.01 O1
.01 13.
24. 1
1 1100
1110 67
68 .05
.05 .00
.00 .05
.04 416.
365.
1 0250 18 .02 .O1 .01 25. ' 1 1120 69 .04 .00 .04 323.
I 0300 19 .02 .01 .01 27. 1 1130 70 .04 .00 .04 187.
I OJ1O 20 .02 .O1 .0I 18. ' 1 1140 71 .04 .00 .04 157,
1 0320 21 .03 .01 .02 30. ' 1 1150 72 .03 .00 .O3 132.
1 0330 22 .03 .01 .O1 32. ' 1 1200 73 .O3 .00 .03 310.
1 0340 13 .O3 .01 .02 34. ' 1 1210 74 .03 .00 .03 191.
1 0350 24 .03 .01 .02 36. ' 1 1220 75 .03 .00 .03 174.
1 0400 25 .O3 .01 .02 38. 1 1230 76 .03 .00 .O3 160.
1 0410 26 .03 .01 .02 40. 1 1240 77 .03 .00 .O3 147.
1 0420 27 .03 .01 .02 42. 1 1250 78 .O3 .00 .03 136.
1 0470 28 .03 .O1 .02 44. ' 1 1300 79 .03 .00 .O3 127.
1 0440 29 .03 .01 .02 46. I 1310 RO .03 .00 .03 119.
1 0450 30 .03 .01 .02 48. 1 1320 81 .03 .00 .03 112.
1 0500 31 O3 .O1 .02 50. 1 1330 82 .03 .00 .03 106.
1 3510 32 .04 .01 .03 52. 1 1340 83 .02 .00 .02 100.
1 0520 33 .04 .01 .O3 55. ' 1 1350 84 .02 .00 .02 95.
l 0530 34 .04 .01 .03 57. 1 1400 85 .02 .00 .02 91.
1 0540 35 .04 .01 .03 60. 1 1410 86 .02 .00 .02 87.
1 0550 36 .05 .01 .04 64. ' 1 1420 81 .02 .00 .02 83.
1 0600 37 .05 .O1 .04 67, ' 1 1430 68 .02 .00 .02 80.
1 0610 38 .05 .O1 .04 71. ' 1 1440 89 .02 .00 .02 71,
' 1 0620 39 .05 .01 .04 76. 1 1450 90 .02 .00 .02 75.
1 0630 40 .06 .01 .05 U. 1 1500 91 .02 .00 .02 72.
1 0640 41 .06 .01 .05 87. 1 1510 92 .02 .00 .02 69.
1 0650 42 .O1 .01 .06 93. 1 1520 93 .02 .00 .02 66.
1 0700 43 .07 .01 .06 99. 1 1530 94 .02 .00 .02 63.
1 0710 44 .08 .O1 .06 106. 1 1540 95 .02 .00 .02 61.
1 0720 45 .08 .O1 .07 114. 1 1550 96 .02 .00 .O1 59.
1 0730 46 .18 .02 .15 114. ' 1 1600 91 .01 .00 .01 56.
1 0740 47 .20 .02 .17 137. 1 1610 98 .02 .00 .01 54.
1 0750 48 .22 .O1 .20 156. ' 1 1620 99 .02 .00 .01 53.
1 0800 49 .21 .02 .19 182. 1 1630 100 .01 .00 .01 51.
1 0810 50 .18 .01 .25 217. I 1640 101 11 .00 O1 50.
1 0820 51 .67 .04 .62 266. '
.

TOTAL RAIIFALL = 7.37, TOTAL LOSS = . 69, TOTAL EXCESS = 0.68
1 PEAK FL01 TIME MAIIMUM AYERAGE FLOG
;CFS) (HR) 6-111 24-111 72-111 16.61-HR
1040. 9.50 (CFS) 432. 188. 188. 188.
' ; INCHES) 5.416 6.535 6.535 6.535
(AC-FT) 214. 259. 259. 259.
CUMULATIVE AREA : .74 SQ M1

HVDROGRAPH AT STATION RESI
It, t a s 22112 a a I I, I t 112 l a a l a a l a l is as t 1121aIIIAaa a I t i t l a l a t, I a t l a t A t 1, l i a l A t a A I a/all a I i A a t I Aa a l l all l t,, a l?? 1111, 11 a a t, I t i I I I, l 1 „t III

4 1 ,
A 901 HRMW ORD OUTFLOW STORAGE STAGE ' DA NOW HRMN ORD OUTFLOW STORAGE STAGE ' DA NOW HRMW ORD OUTFLOW STORAGE STAGE

0000 1 0. .2 330.0 ' 1 0540 35 59. .2 331.8 ' 1 1120 69 352. .3 332.7
0010 2 0. .2 330.0 ' 1 0550 36 59. .2 331.8 ' 1 1130 70 313. .3 332.6
1 0020 3 0. .2 330.0 ' 1 0600 37 59. .2 331.8 ' 1 1140 71 281. .3 332.5
0030 4 0. .2 330.0 ' 1 0610 38 72. .2 331.9 ' 1 1150 72 255. .3 332.4
0040 5 0. .2 330.0 ' 1 0620 39 61. .1 331.8 ' 1 1200 73 234. .3 332.4
1 0050 6 0. .2 330.0 ' 1 0630 40 85. .2 331.9 ' 1 1210 74 205. .3 332.3
1 0100 7 0. .2 330.0 ' 1 0640 41 67. .2 331.8 ' 1 1220 75 194. .3 332.3
0110 8 0. .2 330.0 ' 1 0650 42 98. .2 332.0 ' 1 1230 76 169. .3 332.2
0120 9 0. .2 330.0 ' 1 0700 43 77. .2 331.9 ' 1 1240 77 164. .3 332.2
1 0130 10 0. .2 330.0 ' 1 0710 44 113. .1 332.0 ' 1 1250 78 142. .3 332.1
0140 11 0. .2 33010 ' 1 0720 45 91. .2 332.0 ' 1 1300 79 142. .3 332.1
0150 12 0. .1 330.0 ' 1 0730 46 130. .3 332.1 ' 1 1310 80 120. .2 332.1
1 0200 13 0. .2 330.0 ' 1 0740 47 109. .2 332.0 ' 1 1320 81 126. J 332.1
0210 14 0. .2 330.0 ' 1 0750 48 152. .3 332.2 ' 1 1330 82 105. .2 332.0
0120 15 0. .2 330.0 ' 1 0800 49 143. .3 332.1 ' 1 1340 83 113. .2 332.0
0230 16 0. .2 330.0 ' 1 0810 50 197. .3 332.3 ' 1 1350 84 94. .2 332.0
1 0240 17 0. .2 330.0 ' 1 0820 51 107. .3 332.3 ' 1 1400 85 103. .2 332.0
0250 18 0. .2 330.0 ' 1 0830 52 287. .3 332.5 ' 1 1410 86 86. .2 331.9
0300 19 0. .2 330.0 ' 1 0840 53 360. .3 332.7 ' 1 1420 87 95. .2 332.0
1 0310 20 0. .2 330.0 ' 1 0850 54 500. .3 333.0 ' 1 1430 88 79. .2 331.9
0320 21 0. .2 330.0 ' 1 0900 55 639. .3 333.3 ' 1 1440 89 86. .2 331.9
0330 12 0. .2 330.0 ' 1 0910 56 823. .3 333.6 ' 1 1450 90 74. .2 331.9
1 0340 23 0. .2 330.0 ' 1 0920 57 941. .3 333.8 ' I 1500 91 80. .2 331.9
0350 24 0. .2 330.0 ' 1 0930 58 1030. .3 333.9 ' 1 1510 92 69. .2 331.9
0400 25 0. .2 330.0 ' 1 0940 59 1036. .3 333.9 ' 1 1520 93 73. .2 331.9
0410 26 1. .2 330.8 ' 1 0950 60 1033. .3 333.9 ' 1 1530 94 65. .2 331.8
1 0420 27 69. .1 331.8 ' 1 1000 61 959. .3 333.8 ' 1 1540 95 66. .2 331.8
0430 28 14. .2 331.6 ' I 1010 62 888. .3 333.7 ' 1 1550 96 61. .2 331.8
0440 29 67. .2 331.8 ' 1 1020 63 776. .3 333.5 ' 1 1600 97 59. .2 331.8
1 0450 30 24. .2 331.6 ' 1 1030 64 688. .3 333.3 ' 1 1610 98 58. .1 331.8
0500 31 65. .2 331.8 ' 1 1040 65 590. .3 333.2 ' 1 1620 99 54. .2 331.8
0510 32 35. .2 331.7 ' 1 1050 66 522. .3 333.0 ' 1 1630 100 55. .2 331.8
0520 33 62. .2 331.8 ' 1 1100 67 459. .3 332.9 ' 1 1640 101 49. .2 331.7
0530 34 47. .2 331.7 ' 1 1110 68 404. .3 332.8 '

a/1a 121a Aa 2a/ i t a? a s 21 a, 121 a a , 112 a l a, a 1 a„ I t 2 a a a I t I I 1 2 I a I I t a l a, aJ a l a a a i a„ a 1, a II It
tt?1
„ t2t2,l
,lllt
,a „ 1,It „ I„ 1„ ?t,1 „ t
t,t 2111
AR FLOW TIME KAIIMUM AVERAGE FLOW
(CFS) (HR) 6-HR 24-HR 71-HR 16.67-HR
1036. 9.67 (CFS) 432. 183. 183. 163.
(INCHES) 5.416 6.369 6.369 6.369
(AC-FT) 114. 252. 252. 252.
P K STORAGE TIME MAIIKUM AVERAGE STORAGE
AC-FT) (HR) 6-HR 24-HR 72-HR 16.67-HR
0. 9.50 0. 0. 0. 0.
I STAGE TIME MAXIMUM AVERAGE STAGE
(FEET) (HR) 6-HR 24-HR 72-HR 16.67-HR
333.93 9.67 332.77 331.72 331.72 331.72
CUMULATI VE AREA : .74 SQ KI

' IMPERIAL CENTER WATER QUALITY POND
WATER QUALITY ROUTING
ENVIROTEK JOB NO.: ICWQPI
MAY 5, 1994
ORIFICE FORMULA: Q = CA(2gH)^0.5
C = 0.60 g = 32.2 ft/sec^2 A = 1.681 S.F.
I ONE 8" PIPE WITH NEGATIVE SLOPE
TIME TIME BEGIN FLOW VOL END
PERIOD (MIN) STORAGE OUT OUT STORAGE DEPTH
(C.F.) (C.F.S.) (C.F.) (C.F.) (FT)
1 15 326,640 2.38 2,140 324,500 2.00
' 2 15 324,500 2.37 2,133 322,368 1.99
3 15 322,368 2.36 2,126 320,242 1.97
' 4
5 15
15 320,242
318,124 2.35
2.35 2,119
2,111 318,124
316,012 1.96
1.95
6 15 316,012 2.34 2,104 313,908 1.93
7 15 313,908 2.33 2,097 311,810 1.92
' 8 15 311,810 2.32 2,090 309,720 1.91
9 15 309,720 2.31 2,083 307,637 1.90
10 15 307,637 2.31 2,076 305,560 1.88
11 15 305,560 2.30 2,069 303,491 1.87
' 12 15 303,491 2.29 2,062 301,428 1.86
13 15 301,428 2.28 2,055 299,373 1.85
' 14
15 15
15 299,373
297,325 2.28
2.27 2,048
2,041 297,325
295,284 1.83
1.82
16 15 295,284 2.26 2,034 293,249 1.81
17 15 293,249 2.25 2,027 291,222 1.80
18 15 291,222 2.24 2,020 289,202 1.78
19 15 289,202 2.24 2,013 287,189 1.77
20 15 287,189 2.23 2,006 285,182 1.76
21 15 285,182 2.22 1,999 283,183 1.75
22 15 283,183 2.21 1,992 281,191 1.73
23 15 281,191 2.21 1,985 279,206 1.72
24 15 279,206 2.20 1,978 277,228 1.71
25 15 277,228 2.19 1,971 275,257 1.70
26 15 275,257 2.18 1,964 273,293 1.69
27 15 273,293 2.17 1,957 271,336 1.67
28 15 271,336 2.17 1,950 269,385 1.66
29 15 269,385 2.16 1,943 267,442 1.65
30 15 267,442 2.15 1,936 265,506 1.64
' 31
32 15
15 265,506
263,577 2.14
2.14 1,929
1,922 263,577
261,655 1.63
1.61
33 15 261,655 2.13 1,915 259,741 1.60
34 15 259,741 2.12 1,908 257,833 1.59
35 15 257,833 2.11 1,901 255,932 1.58

36 15 255,932 2.10 1,894 254,038 1.57
37 15 254,038 2.10 1,887 252,151 1.56
38 15 252,151 2.09 1,880 250,271 1.54
39 15 250,271 2.08 1,873 248,398 1.53
40 15 248,398 2.07 1,866 246,533 1.52
' 41 15 246,533 2.07 1,859 244,674 1.51
42 15 244,674 2.06 1,852 242,822 1.50

43 15 242,822 2.05 1,845 240,977 1.49
44 15 240,977 2.04 1,838 239,140 1.48
' 45 15 239,140 2.03 1,831 237,309 1.46
46 15 237,309 2.03 1,824 235,485 1.45
47
48 15
15 235,485
233,669 2.02
2.01 1,817
1,810 233,669
231,859 1.44
1.43
49 15 231,859 2.00 1,803 230,056 1.42
50 15 230,056 2.00 1,796 228,261 1.41
51 15 228,261 1.99 1,789 226,472 1.40
' 52 15 226,472 1.98 1,782 224,691 1.39
53 15 224,691 1.97 1,775 222,916 1.38
54
55 15
15 222,916
221,149 1.96
1.96 1,768
1,760 221,149
219,388 1.36
1.35
56 15 219,388 1.95 1,753 217,635 1.34
57 15 217,635 1.94 1,746 215,888 1.33
58 15 215,888 1.93 1,739 214,149 1.32
59 15 214,149 1.92 1,732 212,416 1.31
60 15 212,416 1.92 1,725 210,691 1.30
61 15 210,691 1.91 1,718 208,973 1.29
' 62 15 208,973 1.90 1,711 207,261 1.28
63 15 207,261 1.89 1,704 205,557 1.27
' 64
65 15
15 205,557
203,860 1.89
1.88 1,697
1,690 203,860
202,169 1.26
1.25
66 15 202,169 1.87 1,683 200,486 1.24
67 15 200,486 1.86 1,676 198,810 1.23
68 15 198,810 1.85 1,669 197,141 1.22
69 15 197,141 1.85 1,662 195,478 1.21
70 15 195,478 1.84 1,655 193,823 1.20
71 15 193,823 1.83 1,648 192,175 1.19
' 72 15 192,175 1.82 1,641 190,534 1.18
73 15 190,534 1.82 1,634 188,900 1.17
74 15 188,900 1.81 1,627 187,273 1.16
75 15 187,273 1.80 1,620 185,653 1.15
76 15 185,653 1.79 1,613 184,040 1.14
77 15 184,040 1.78 1,606 182,434 1.13
78 15 182,434 1.78 1,599 180,835 1.12
79 15 180,835 1.77 1,592 179,243 1.11
80 15 179,243 1.76 1,585 177,658 1.10
81 15 177,658 1.75 1,578 176,080 1.09
82 15 176,080 1.75 1,571 174,509 1.08
83 15 174,509 1.74 1,564 172,945 1.07
84 15 172,945 1.73 1,557 171,388 1.06
85 15 171,388 1.72 1,550 169,839 1.05

86 15 169,839 1.71 1,543 168,296 1.04
87 15 168,296 1.71 1,536 166,760 1.03
' 88 15 166,760 1.70 1,529 165,231 1.02
89 15 165,231 1.69 1,522 163,710 1.01
' 90
91 15
15 163,710
162,195 1.68
1.68 1,515
1,508 162,195
160,687 1.00
0.99
92 15 160,687 1.67 1,501 159,187 0.98
93 15 159,187 1.66 1,494 157,693 0.97
94 15 157,693 1.65 1,487 156,206 0.97
95 15 156,206 1.64 1,480 154,727 0.96
96 15 154,727 1.64 1,473 153,254 0.95
97 15 153,254 1.63 1,466 151,789 0.94
' 98 15 151,789 1.62 1,459 150,330 0.93

99 15 150,330 1.61 1,451 148,879 0.92
100 15 148,879 1.60 1,444 147,434 0.91
101 15 147,434 1.60 1,437 145,997 0.90
102 15 145,997 1.59 1,430 144,566 0.89
103 15 144,566 1.58 1,423 143,143 0.89
104 15 143,143 1.57 1,416 141,727 0.88
105 15 141,727 1.57 1,409 140,317 0.87
106 15 140,317 1.56 1,402 138,915 0.86
107 15 138,915 1.55 1,395 137,520 0.85
108 15 137,520 1.54 1,388 136,131 0.84
109 15 136,131 1.53 1,381 134,750 0.83
110 15 134,750 1.53 1,374 133,376 0.83
111 15 133,376 1.52 1,367 132,009 0.82
' 112 15 132,009 1.51 1,360 130,649 0.81
113 15 130,649 1.50 1,353 129,295 0.80
114
115 15
15 129,295
127,949 1.50
1.49 1,346
1,339 127,949
126,610 0.79
0.78
116 15 126,610 1.48 1,332 125,278 0.78
117 15 125,278 1.47 1,325 123,953 0.77
' 118 15 123,953 1.46 1,318 122,635 0.76
119 15 122,635 1.46 1,311. 121,324 0.75
120 15 121,324 1.45 1,304 120,020 0.74
121 15 120,020 1.44 1,297 118,723 0.73
' 122 15 118,723 1.43 1,290 117,433 0.73
123 15 117,433 1.43 1,283 116,150 0.72
124
125 15
15 116,150
114,875 1.42
1.41 1,276
1,269 114,875
113,606 0.71
0.70
126 15 113,606 1.40 1,262 112,344 0.70
127 15 112,344 1.39 1,255 111,089 0.69
' 128 15 111,089 1.39 1,248 109,841 0.68
129 15 109,841 1.38 1,241 108,601 0.67
130 15 108,601 1.37 1,234 107,367 0.66
131 15 107,367 1.36 1,227 106,140 0.66
' 132 15 106,140 1.36 1,220 104,921 0.65
133 15 104,921 1.35 1,213 103,708 0.64
' 134
135 15
15 103,708
502
102 1.34
1
33 1,206
1
199 102,502
101
304 0.63
0.63
, . , ,

136 15 101,304 1.32 1,192 100,112 0.62
137 15 100,112 1.32 1,184 98,928 0.61
138 15 98,928 1.31 1,177 97,750 0.61
139 15 97,750 1.30 1,170 96,580 0.60
140 15 96,580 1.29 1,163 95,417 0.59
141 15 95,417 1.28 1,156 94,260 0.58
142 15 94,260 1.28 1,149 93,111 0.58
143 15 93,111 1.27 1,142 91,969 0.57
144 15 91,969 1.26 1,135 90,833 0.56
145 15 90,833 1.25 1,128 89,705 0.56
146 15 89,705 1.25 1,121 88,584 0.55
147 15 88,584 1.24 1,114 87,469 0.54
148 15 87,469 1.23 1,107 86,362 0.54
149 15 86,362 1.22 1,100 85,262 0.53
150 15 85,262 1.21 1,093 84,169 0.52
151 15 84,169 1.21 1,086 83,083 0.52
152 15 83,083 1.20 1,079 82,004 0.51
153 15 82,004 1.19 1,072 80,932 0.50
154 15 80,932 1.18 1,065 79,867 0.50
155 15 79,867 1.18 1,058 78,809 0.49
156 15 78,809 1.17 1,051 77,758 0.48
157 15 77,758 1.16 1,044 76,714 0.48
158 15 76,714 1.15 1,037 75,677 0.47
159 15 75,677 1.14 1,030 74,647 0.46
160 15 74,647 1.14 1,023 73,624 0.46
161 15 73,624 1.13 1,016 72,609 0.45
162 15 72,609 1.12 1,009 71,600 0.44
163 15 71,600 1.11 1,002 70,598 0.44
164 15 70,598 1.11 995 69,604 0.43
165 15 69,604 1.10 988 68,616 0.43
166 15 68,616 1.09 981 67,635 0.42
167 15 67,635 1.08 974 66,662 0.41
168 15 66,662 1.07 967 65,695 0.41
169 15 65,695 1.07 960 64,736 0.40
170 15 64,736 1.06 952 63,783 0.40
171 15 63,783 1.05 945 62,838 0.39
172 15 62,838 1.04 938 61,899 0.38
173 15 61,899 1.03 931 60,968 0.38
174 15 60,968 1.03 924 60,043 0.37
175 15 60,043 1.02 917 59,126 0.37
176 15 59,126 1.01 910 58,216 0.36
177 15 58,216 1.00 903 57,313 0.36
178 15 57,313 1.00 896 56,416 0.35
179 15 56,416 0.99 889 55,527 0.35
180 15 55,527 0.98 882 54,645 0.34
181 15 54,645 0.97 875 53,770 0.33
182 15 53,770 0.96 868 52,902 0.33
183 15 52,902 0.96 861 52,041 0.32
184 15 52,041 0.95 854 51,187 0.32
185 15 51,187 0.94 847 50,340 0.31

186 15 50,340 0.93 840 49,500 0.31
187 15 49,500 0.93 833 48,667 0.30
' 188 15 48,667 0.92 826 47,841 0.30
189 15 47,841 0.91 819 47,022 0.29
190 15 47,022 0.90 812 46,210 0.29
' 191 15 46,210 0.89 805 45,406 0.28
192 15 45,406 0.89 798 44,608 0.28
193 15 44,608 0.88 791 43,817 0.27
' 194 15 43,817 0.87 784 43,034 0.27
195 15 43,034 0.86 777 42,257 0.26
196 15 42,257 0.86 770 41,488 0.26
197 15 41,488 0.85 763 40,725 0.25
' 198 15 40,725 0.84 755 39,970 0.25
199 15 39,970 0.83 748 39,221 0.24
200 15 39,221 0.82 741 38,480 0.24
201 15 38,480 0.82 734 37,745 0.24
202 15 37,745 0.81 727 37,018 0.23
203 15 37,018 0.80 720 36,298 0.23
204 15 36,298 0.79 713 35,585 0.22
205 15 35,585 0.78 706 34,878 0.22
206 15 34,878 0.78 699 34,179 0.21
207
208 15
15 34,179
33,487 0.77
0.76 692
685 33,487
32,802 0.21
0.21
209 15 32,802 0.75 678 32,124 0.20
210 15 32,124 0.75 671 31,453 0.20

211 15 31,453 0.74 664 30,789 0.19
212 15 30,789 0.73 657 30,132 0.19
213 15 30,132 0.72 650 29,482 0.18
' 214
215 15
15 29,482
28,840 0.71
0.71 643
636 28,840
28,204 0.18
0.18
216 15 28,204 0.70 629 27,575 0.17
217 15 27,575 0.69 622 26,954 0.17
218 15 26,954 0.68 615 26,339 0.17
219 15 26,339 0.68 608 25,731 0.16
220 15 25,731 0.67 601 25,131 0.16
221 15 25,131 0.66 593 24,537 0.15
222 15 24,537 0.65 586 23,951 0.15
223 15 23,951 0.64 579 23,372 0.15
' 224
225 15
15 23,372
22,799 0.64
0.63 572
565 22,799
22,234 0.14
0.14
226 15 22,234 0.62 558 21,676 0.14
227 15 21,676 0.61 551 21,125 0.13
228 15 21,125 0.60 544 20,581 0.13
1 229 15 20,581 0.60 537 20,043 0.13
230 15 20,043 0.59 530 19,513 0.12
231 15 19,513 0.58 523 18,991 0.12
' 232 15 18,991 0.57 516 18,475 0.12
233 15 18,475 0.57 509 17,966 0.11
234 15 17,966 0.56 502 17,464 0.11
' 235 15 17,464 0.55 495 16,969 0.11

236 15 16,969 0.54 488 16,482 0.10
237 15 16,482 0.53 481 16,001 0.10
' 238 15 16,001 0.53 474 15,527 0.10
239 15 15,527 0.52 466 15,061 0.10
240 15 15,061 0.51 459 14,602 0.09
' 241 15 14,602 0.50 452 14,149 0.09
242 15 14,149 0.49 445 13,704 0.09
243 15 13,704 0.49 438 13,266 0.08
244 15 13,266 0.48 431 12,834 0.08
245 15 12,834 0.47 424 12,410 0.08
246 15 12,410 0.46 417 11,993 0.08
' 247
248 15
15 11,993
11,583 0.46
0.45 410
403 11,583
11,180 0.07
0.07
249 15 11,180 0.44 396 10,785 0.07
250 15 10,785 0.43 389 10,396 0.07
' 251 15 10,396 0.42 382 10,014 0.06
252 15 10,014 0.42 375 9,639 0.06
253 15 9,639 0.41 368 9,272 0.06
254 15 9,272 0.40 360 8,911 0.06
' 255 15 8,911 0.39 353 8,558 0.05
256 15 8,558 0.38 346 8,212 0.05
257 15 8,212 0.38 339 7,873 0.05
258 15 7,873 0.37 332 7,540 0.05
259 15 7,540 0.36 325 7,215 0.05
260 15 7,215 0.35 318 6,897 0.04
261 15 6,897 0.35 311 6,586 0.04
262 15 6,586 0.34 304 6,283 0.04
263 15 6,283 0.33 297 5,986 0.04
' 264
265 15
15 5,986
5,696 0.32
0.31 290
283 5,696
5,414 0.04
0.03
266 15 5,414 0.31 275 5,138 0.03

267 15 5,138 0.30 268 4,870 0.03
268 15 4,870 0.29 261 4,609 0.03
269 15 4,609 0.28 254 4,354 0.03
270 15 4,354 0.27 247 4,107 0.03
271
272 15
15 4,107
3,868 0.27
0.26 240
233 3,868
3,635 0.03
0.02
273 15 3,635 0.25 226 3,409 0.02
274 15 31409 0.24 219 3,190 0.02
275 15 3,190 0.23 211 2,979 0.02
276 15 2,979 0.23 204 2,775 0.02
277 15 2,775 0.22 197 2,577 0.02
278 15 2,577 0.21 190 2,387 0.02
279 15 2,387 0.20 183 2,204 0.01
280 15 2,204 0.20 176 2,029 0.01
' 281
282 15
15 2,029
1,860 0.19
0.18 169
161 1,860
1,699 0.01
0.01
283 15 1,699 0.17 154 1,544 0.01
284 15 1,544 0.16 147 1,397 0.01
' 285 15 1,397 0.16 140 1,257 0.01

286 15 1,257 0.15 133 1,125 0.01
287 15 1,125 0.14 126 999 0.01
t 288 15 999 0.13 118 881 0.01
289 15 881 0.12 111 770 0.01
290 15 770 0.12 104 666 0.00
291 15 666 0.11 97 569 0.00
292 15 569 0.10 89 480 0.00
293 15 480 0.09 82 398 0.00
294 15 398 0.08 75 323 0.00
' 295 15 323 0.07 67 256 0.00
296 15 256 0.07 60 196 0.00
' 297
298 15
15 196
144 0.06
0.05 52
45 144
99 0.00
0.00
299 15 99 0.04 37 62 0.00
300 15 62 0.03 29 32 0.00
' 301 15 32 0.02 21 11 0.00
302 15 11 0.01 12 (1) 0.00
WATER QUAL ITY DISCHARGE TIME = 75 HRS (+/)

1

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r7

IMPERIAL CENTER WATER QUALITY POND
EMERGENCY DRAIN ROUTING
ENVIROTER JOB NO.: ICWQPI
MAY 5, 1994
ORIFICE FORMULA: Q - CA(2gH)100.5
ONE 12" PIPE WITH GATE VALVE
C - 0.60 g - 32.2 ft/sec*2 A - 0.785 S.F.
(H MEASURED FROM CENTER OF PIPE)
TIME TIME BEGIN FLOW VOL END
PERIOD (MIN) STORAGE OUT OUT STORAGE DEPTH
(C.F.) (C.F.S.) (C.F.) (C.F.) (FT)
1 15 471,320 10.36 9,321 461,999 8.00
2 15 461,999 10.25 9,222 452,777 7.84
3 15 452,777 10.14 9,123 443,654 7.69
4 15 443,654 10.03 9,024 434,629 7.53
5 15 434,629 9.92 8,926 425,704 7.38
' 6 15 425,704 9.81 8,827 416,877 7.23
7 15 416,877 9.70 8,728 408,149 7.08
8 15 408,149 9.59 8,629 399,520 6.93
' 9
10 15
15 399,520
390,990 9.48
9.37 8,530
8,431 390,990
382,559 6.78
6.64
11 15 382,559 9.26 8,332 374,226 6.49
12 15 374,226 9.15 8,233 365,993 6.35
13 15 365,993 9.04 8,135 357,859 6.21
14 15 357,859 8.93 8,036 349,823 6.07
15 15 349,823 8.82 7,937 341,886 5.94
16 15 341,886 8.71 7,838 334,048 5.80
17 15 334,048 8.60 7,739 326,310 5.67
18 15 326,310 8.49 7,640 318,670 5.54
19 15 318,670 8.38 7,541 311,129 5.41
20 15 311,129 8.27 7,442 303,687 5.28
21 15 303,687 8.16 7,343 296,344 5.15
22 15 296,344 8.05 7,244 289,100 5.03
23 15 289,100 7.94 7,145 281,955 4.91
' 24
25 15
15 281,955
274,909 7.83
7.72 7,046
6,947 274,909
267,962 4.79
4.67
26 15 267,962 7.61 6,848 261,114 4.55
27 15 261,114 7.50 6,749 254,365 4.43
28 15 254,365 7.39 6,650 247,715 4.32
29 15 247,715 7.28 6,551 241,164 4.20
30 15 241,164 7.17 6,452 234,712 4.09
31 15 234,712 7.06 6,353 228,359 3.98
32 15 228,359 6.95 6,254 222,106 3.88
' 33 15 222,106 6.84 6,155 215,951 3.77
34 15 215,951 6.73 6,055 209,895 3.67
35
36 15
15 209,895
203,939 6.62
6.51 5,956
5,857 203,939
198,082 3.56
3.46
37 15 198,082 6.40 5,758 192,324 3.36
38 15 192,324 6.29 5,659 186,665 3.26
39 15 186,665 6.18 5,560 181,105 3.17
' 40 15 181,105 6.07 5,461 175,645 3.07
41 15 175,645 5.96 5,361 170,283 2.98
42 15 170,283 5.85 5,262 165,021 2.89
Fl
L
F

0

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7

?I

43 15 165,021 5.74 5,163 159,858 2.80
44 15 159,858 5.63 5,064 154,795 2.71
45 15 154,795 5.52 4,964 149,831 2.63
46 15 149,831 5.41 4,865 144,966 2.54
47 15 144,966 5.30 4,766 140,200 2.46
48 15 140,200 5.18 4,666 135,534 2.38
49 15 135,534 5.07 4,567 130,967 2.30
50 15 130,967 4.96 4,468 126,499 2.22
51 15 126,499 4.85 4,368 122,131 2.15
52 15 122,131 4.74 4,269 117,862 2.07
53 15 117,862 4.63 4,169 113,693 2.00
54 15 113,693 4.52 4,070 109,623 1.93
55 15 109,623 4.41 3,970 105,653 1.86
56 15 105,653 4.30 3,871 101,783 1.79
57 15 101,783 4.19 3,771 98,012 1.73
58 15 98,012 4.08 3,671 94,340 1.66
59 15 94,340 3.97 3,572 90,768 1.60
60 15 90,768 3.86 3,472 87,296 1.54
61 15 87,296 3.75 3,372 83,924 1.48
62 15 83,924 3.64 3,273 80,652 1.42
63 15 80,652 3.53 3,173 77,479 1.37
64 15 77,479 3.41 3,073 74,406 1.32
65 15 74,406 3.30 2,973 71,433 1.26
66 15 71,433 3.19 2,873 68,560 1.21
67 15 68,560 3.08 2,773 65,787 1.16
68 15 65,787 2.97 2,673 63,115 1.12
69 15 63,115 2.86 2,573 60,542 1.07
70 15 60,542 2.75 2,472 58,070 1.03
71 15 58,070 2.60 2,336 55,734 0.99
72 15 55,734 2.54 2,288 53,446 0.95
73 15 53,446 2.49 2,241 51,205 0.91
74 15 51,205 2.44 2,193 49,012 0.87
75 15 49,012 2.38 2,146 46,866 0.83
76 15 46,866 2.33 2,098 44,768 0.80
77 15 44,768 2.28 2,051 42,717 0.76
78 15 42,717 2.23 2,003 40,714 0.73
79 15 40,714 2.17 1,956 38,758 0.69
80 15 38,758 2.12 1,908 36,850 0.66
81 15 36,850 2.07 1,861 34,990 0.63
82 15 34,990 2.01 1,813 33,176 0.59
83 15 33,176 1.96 1,765 31,411 0.56
84 15 31,411 1.91 1,718 29,693 0.53
85 15 29,693 1.86 1,670 28,023 0.50
86 15 28,023 1.80 1,623 26,401 0.48
87 15 26,401 1.75 1,575 24,826 0.45
88 15 24,826 1.70 1,527 23,299 0.42
89 15 23,299 1.64 1,479 21,819 0.40
90 15 21,819 1.59 1,432 20,387 0.37
91 15 20,387 1.54 1,384 19,003 0.35
92 15 19,003 1.48 1,336 17,667 0.32
93 15 17,667 1.43 1,288 16,379 0.30
94 15 16,379 1.38 1,240 15,139 0.28
95 15 15,139 1.33 1,193 13,946 0.26
96 15 13,946 1.27 1,145 12,801 0.24
97 15 12,801 1.22 1,097 11,705 0.22
98 15 11,705 1.17 1,049 10,656 0.20
WEIR
FLOW
I?
1

99
100 15
15 10,656
9,656 1.11
1.06 1,001
952 9,656
8,703 0.18
0.16
101 15 8,703 1.00 904 7,799 0.15
102 15 7,799 0.95 856 6,943 0.13
103 15 6,943 0.90 808 6,135 0.12
104 15 6,135 0.84 759 5,376 0.10
105 15 5,376 0.79 711 4,665 0.09
106 15 4,665 0.74 662 4,003 0.08
107 15 4,003 0.68 613 3,390 0.07
' 108 15 3,390 0.63 564 2,826 0.06
109 15 2,826 0.57 515 2,311 0.05
110 15 2,311 0.52 466 1,845 0.04
' 111 15 1,845 0.46 416 1,428 0.03
112 15 1,428 0.41 366 1,062 0.02
113 15 1,062 0.35 316 746 0.02
' 114
115 15
15 746
481 0.29
0.24 265
213 481
269 0.01
0.01
116 15 269 0.18 159 110 0.00
117 15 110 0.11 102 8 0.00
' POND DRAIN TIME = 29 HRS (+/) (EMERGENCY DRAIN)

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APPENDIX B
REVISED ROUTING CALCULATIONS
Water Quality Routing
(21 Oct 1997)
WATER QUALITY POND
AND
WETLAND FILL
PROJECT COMPLETION DOCUMENTATION
22 OCTOBER 1997
ICWQP1 28 Oct 1997 Page 6
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IMPERIAL CENTER WATER QUALITY POND NO. 1
WATER QUALITY ROUTING
21 OCTOBER 1997
ENVIROTEK JOB NO.: ICWQPI
PAGE 1
W.Q. ORIFICE = INVERTED 8" PIPE
W.Q. ORIFICE ELEVATION = 330.39
80' WIDE SPILLWAY E LEV. = 331.49

TDAE BEGIN W.Q. TOTAL END
ME INCR. W.S. STORAGE ORIFICE FLOW FLOW STORAGE
PEROID [IvHM ELEV [C.F.] HEIGHT [CFS] [C.F.] [C.F.]

1 15 331.49 240,142 1.49 2.05 1,846 238,296
2 15 331.48 238,296 1.48 2.04 1,839 236,456
3 15 331.47 236,456 1.47 2.04 1,832 234,624
4 15 331.46 234,624 1.46 2.03 1,825 232,799
5 15 331.44 232,799 1.44 2.02 1,818 230,981
6 15 331.43 230,981 1.43 2.01 1,811 229,170
7 15 331.42 229,170 1.42 2.00 1,804 227,367
8 15 331.41 227,367 1.41 2.00 1,797 225,570
9 15 331.40 225,570 1.40 1.99 1,790 223,780
10 15 331.39 223,780 1.39 1.98 1,782 221,998
11 15 331.38 221,998 1.38 1.97 1,775 220,223
12 15 331.37 220,223 1.37 1.96 1,768 218,455
13 15 331.36 218,455 1.36 1.96 1,761 216,694
14 15 331.34 216,694 1.34 1.95 1,754 214,940
15 15 331.33 214,940 1.33 1.94 1,747 213,193
16 15 331.32 213,193 1.32 1.93 1,740 211,453
17 15 331.31 211,453 1.31 1.93 1,733 209,720
18 15 331.30 209,720 1.30 1.92 1,725 207,995
19 15 331.29 207,995 1.29 1.91 1,718 206,277
20 15 331.28 206,277 1.28 1.90 1,711 204,565
21 15 331.27 204,565 1.27 1.89 1,704 202,861
22 15 331.26 202,861 1.26 1.89 1,697 201,164
23 15 331.25 201,164 1.25 1.88 1,690 199,474
24 15 331.24 199,474 1.24 1.87 1,683 197,791
25 15 331.23 197,791 1.23 1.86 1,676 196,116
26 15 331.22 196,116 1.22 1.85 1,669 194,447
27 15 331.21 194,447 1.21 1.85 1,661 192,786
28 15 331.20 192,786 1.20 1.84 1,654 191,131
29 15 331.19 191,131 1.19 1.83 1,647 189,484
30 15 331.18 189,484 1.18 1.82 1,640 187,844
31 15 331.17 187,844 1.17 1.81 1,633 186,211
32 15 331.16 186,211 1.16 1.81 1,626 184,585
33 15 331.15 184,585 1.15 1.80 1,619 182,966
34 15 331.14 182,966 1.14 1.79 1,612 181,355
35 15 331.13 181,355 1.13 1.78 1,605 179,750
36 15 331.12 179,750 1.12 1.77 1,597 178,153
37 15 331.11 178,153 1.11 1.77 1,590 176,562
38 15 331.10 176,562 1.10 1.76 1,583 174,979
39 15 331.09 174,979 1.09 1.75 1,576 173,403

fl

7

I

RvIPERIAL CENTER WATER QUALITY POND NO. 1
WATER QUALITY ROUTING
TIME BEGIN W.Q. TOTAL END
ME INCR. W.S. STORAGE ORIFICE FLOW FLOW STORAGE
PEROID [MIN] ELEV [C.F.] HEIGHT [CFS] [C.F.] [C.F.]

40 15 331.08 173,403 1.08 1.74 1,569 171,834
41 15 331.07 171,834 1.07 1.74 1,562 170,272
42 15 331.06 170,272 1.06 1.73 1,555 168,717
43 15 331.05 168,717 1.05 1.72 1,548 167,170
44 15 331.04 167,170 1.04 1.71 1,541 165,629
45 15 331.03 165,629 1.03 1.70 1,533 164,096
46 15 331.02 164,096 1.02 1.70 1,526 162,569
47 15 331.01 162,569 1.01 1.69 1,519 161,050
48 15 331.00 161,050 1.00 1.68 1,512 159,538
49 15 330.99 159,538 0.99 1.67 1,505 158,033
50 15 330.98 158,033 0.98 1.66 1,498 156,53.5
51 15 330.97 156,535 0.97 1.66 1,491 155,045
52 15 330.96 155,045 0.96 1.65 1,484 153,561
53 15 330.95 153,561 0.95 1.64 1,476 152,084
54 15 330.94 152,084 0.94 1.63 1,469 150,615
55 15 330.93 150,615 0.93 1.62 1,462 149,153
56 15 330.93 149,153 0.93 1.62 1,455 147,698
57 15 330.92 147,698 0.92 1.61 1,448 146,250
58 15 330.91 146,250 0.91 1.60 1,441 144,809
59 15 330.90 144,809 0.90 1.59 1,434 143,375
60 15 330.89 143,375 0.89 1.59 1,427 141,948
61 15 330.88 141,948 0.88 1.58 1,420 140,529
62 15 330.87 140,529 0.87 1.57 1,412 139,116
63 15 330.86 139,116 0.86 1.56 1,405 137,711
64 15 330.85 137,711 0.85 1.55 1,398 136,313
65 15 330.85 136,313 0.85 1.55 1,391 134,922
66 15 330.84 134,922 0.84 1.54 1,384 133,538
67 15 330.83 133,538 0.83 1.53 1,377 132,161
68 15 330.82 132,161 0.82 1.52 1,370 130,791
69 15 330.81 130,791 0.81 1.51 1,363 129,428
70 15 330.80 129,428 0.80 1.51 1,356 128,073
71 15 330.79 128,073 0.79 1.50 1,348 126,724
72 15 330.79 126,724 0.79 1.49 1,341 125,383
73 15 330.78 125,383 0.78 1.48 1,334 124,049
74 15 330.77 124,049 0.77 1.47 1,327 122,722
75 15 330.76 122,722 0.76 1.47 1,320 121,402
76 15 330.75 121,402 0.75 1.46 1,313 120,089
77 15 330.75 120,089 0.75 1.45 1,306 118,783
78 15 330.74 118,783 0.74 1.44 1,299 117,485
79 15 330.73 117,485 0.73 1.43 1,291 116,193
80 15 330.72 116,193 0.72 1.43 1,284 114,909
81 15 330.71 114,909 0.71 1.42 1,277 113,632
82 15 330.71 113,632 0.71 1.41 1,270 112,362
21 OCTOBER 1997
ENVIROTEK JOB NO.: ICWQPI
PAGE
2

r

MPERIAL CENTER WATER QUALITY POND NO. 1
WATER QUALITY ROUTING
TRAE BEGIN W.Q. TOTAL END
THE INCR. W.S. STORAGE ORIFICE FLOW FLOW STORAGE
PEROID [MIN] ELEV [C.F.] HEIGHT [CFS] [C.F.] [C.F.]

83 15 330.70 112,362 0.70 1.40 1,263 111,099
84 15 330.69 111,099 0.69 1.40 1,256 109,843
85 15 330.68 109,843 0.68 1.39 1,249 108,594
86 15 330.67 108,594 0.67 1.38 1,242 107,352
87 15 330.67 107,352 0.67 1.37 1,235 106,118
88 15 330.66 106,118 0.66 1.36 1,227 104,890
89 15 330.65 104,890 0.65 1.36 1,220 103,670
90 15 330.64 103,670 0.64 1.35 1,213 102,457
91 15 330.64 102,457 0.64 1.34 1,206 101,251
92 15 330.63 101,251 0.63 1.33 1,199 100,052
93 15 330.62 100,052 0.62 1.32 1,192 98,860
94 15 330.61 98,860 0.61 1.32 1,185 97,676
95 15 330.61 97,676 0.61 1.31 1,178 96,498
96 15 330.60 96,498 0.60 1.30 1,170 95,328
97 15 330.59 95,328 0.59 1.29 1,163 94,164
98 15 330.58 94,164 0.58 1.28 1,156 93,008
99 15 330.58 93,008 0.58 1.28 1,149 91,859
100 15 330.57 91,859 0.57 1.27 1,142 90,717
101 15 330.56 90,717 0.56 1.26 1,135 89,582
102 15 330.56 89,582 0.56 1.25 1,128 88,454
103 15 330.55 88,454 0.55 1.25 1,121 87,334
104 15 330.54 87,334 0.54 1.24 1,113 86,220
105 15 330.53 86,220 0.53 1.23 1,106 85,114
106 15 330.53 85,114 0.53 1.22 1,099 84,015
107 15 330.52 84,015 0.52 1.21 1,092 82,923
108 15 330.51 82,923 0.51 1.21 1,085 81,838
109 15 330.51 81,838 0.51 1.20 1,078 80,760
110 15 330.50 80,760 0.50 1.19 1,071 79,689
111 15 330.49 79,689 0.49 1.18 1,064 78,625
112 15 330.49 78,625 0.49 1.17 1,057 77,569
113 15 330.48 77,569 0.48 1.17 1,049 76,519
114 15 330.47 76,519 0.47 1.16 1,042 75,477
115 15 330.47 75,477 0.47 1.15 1,035 74,442
116 15 330.46 74,442 0.46 1.14 1,028 73,414
117 15 330.46 73,414 0.46 1.13 1,021 72,393
118 15 330.45 72,393 0.45 1.13 1,014 71,379
119 15 330.44 71,379 0.44 1.12 1,007 70,373
120 15 330.44 70,373 0.44 1.11 1,000 69,373
121 15 330.43 69,373 0.43 1.10 992 68,381
122 15 330.42 68,381 0.42 1.09 985 67,395
123 15 330.42 67,395 0.42 1.09 978 66,417
124 15 330.41 66,417 0.41 1.08 971 65,446
125 15 330.41 65,446 0.41 1.07 964 64,482
21 OCTOBER 1997
ENVIROTEK JOB NO.: ICWQPI
PAGF
3
0

0

P"ERIAL CENTER WATER QUALITY POND NO. 1
WATER QUALITY ROUTING
THE BEGIN W.Q. TOTAL END
TRVIE INCR. W.S. STORAGE ORIFICE FLOW FLOW STORAGE
PEROID P&M ELEV [C.F.] HEIGHT [CFS] [C.F.] [C.F.]

126 15 330.40 64,482 0.40 1.06 957 63,526
127 15 330.39 63,526 0.39 1.06 950 62,576
128 15 330.39 62,576 0.39 1.05 943 61,633
129 15 330.38 61,633 0.38 1.04 935 60,698
130 15 330.38 60,698 0.38 1.03 928 59,770
131 15 330.37 59,770 0.37 1.02 921 58,849
132 15 330.37 58,849 0.37 1.02 914 57,935
133 15 330.36 57,935 0.36 1.01 907 57,028
134 15 330.35 57,028 0.35 1.00 900 56,128
135 15 330.35 56,128 0.35 0.99 893 55,235
136 15 330.34 55,235 0.34 0.98 886 54,350
137 15 330.34 54,350 0.34 0.98 878 53,471
138 15 330.33 53,471 0.33 0.97 871 52,600
139 15 330.33 52,600 0.33 0.96 864 51,736
140 15 330.32 51,736 0.32 0.95 857 50,879
141 15 330.32 50,879 0.32 0.94 850 50,029
142 15 330.31 50,029 0.31 0.94 843 49,186
143 15 330.31 49,186 0.31 0.93 836 48,351
144 15 330.30 48,351 0.30 0.92 829 47,522
145 15 330.29 47,522 0.29 0.91 821 46,701
146 15 330.29 46,701 0.29 0.90 814 45,887
147 15 330.28 45,887 0.28 0.90 807 45,079
148 15 330.28 45,079 0.28 0.89 800 44,279
149 15 330.27 44,279 0.27 0.88 793 43,487
150 15 330.27 43,487 0.27 0.87 786 42,701
151 15 330.26 42,701 0.26 0.87 779 41,922
152 15 330.26 41,922 0.26 0.86 771 41,151
153 15 330.26 41,151 0.26 0.85 764 40,386
154 15 330.25 40,386 0.25 0.84 757 39,629
155 15 330.25 39,629 0.25 0.83 750 38,879
156 15 330.24 38,879 0.24 0.83 743 38,136
157 15 330.24 38,136 0.24 0.82 736 37,400
158 15 330.23 37,400 0.23 0.81 729 36,672
159 15 330.23 36,672 0.23 0.80 722 35,950
160 15 330.22 35,950 0.22 0.79 714 35,236
161 15 330.22 35,236 0.22 0.79 707 34,529
162 15 330.21 34,529 0.21 0.78 700 33,828
163 15 330.21 33,828 0.21 0.77 693 33,135
164 15 330.21 33,135 0.21 0.76 686 32,450
165 15 330.20 32,450 0.20 0.75 679 31,771
166 15 330.20 31,771 0.20 0.75 672 31,099
167 15 330.19 31,099 0.19 0.74 664 30,435
168 15 330.19 30,435 0.19 0.73 657 29,777
21 OCTOBER 1997
ENVIROTEK JOB NO.: ICWQPI
PAGE
4

fl

D

17

L

MWERIAL CENTER WATER QUALITY POND NO. 1
WATER QUALITY ROUTING
TDAE BEGIN W.Q. TOTAL END
TIME INCK W.S. STORAGE ORIFICE FLOW FLOW STORAGE
PEROID Imam ELEV [C.F.] HEIGHT [CFS] [C.F.] [C.F.]

169 15 330.18 29,777 0.18 0.72 650 29,127
170 15 330.18 29,127 0.18 0.71 643 28,484
171 15 330.18 28,484 0.18 0.71 636 27,848
172 15 330.17 27,848 0.17 0.70 629 27,220
173 15 330.17 27,220 0.17 0.69 622 26,598
174 15 330.17 26,598 0.17 0.68 614 25,983
175 15 330.16 25,983 0.16 0.67 607 25,376
176 15 330.16 25,376 0.16 0.67 600 24,776
177 15 330.15 24,776 0.15 0.66 593 24,183
178 15 330.15 24,183 0.15 0.65 586 23,597
179 15 330.15 23,597 0.15 0.64 579 23,018
180 15 330.14 23,018 0.14 0.64 572 22,446
181 15 330.14 22,446 0.14 0.63 565 21,882
182 15 330.14 21,882 0.14 0.62 557 21,325
183 15 330.13 21,325 0.13 0.61 550 20,774
184 15 330.13 20,774 0.13 0.60 543 20,231
185 15 330.13 20,231 0.13 0.60 536 19,695
186 15 330.12 19,695 0.12 0.59 529 19,167
187 15 330.12 19,167 0.12 0.58 522 18,645
188 15 330.12 18,645 0.12 0.57 514 18,130
189 15 330.11 18,130 0.11 0.56 507 17,623
190 15 330.11 17,623 0.11 0.56 500 17,123
191 15 330.11 17,123 0.11 0.55 493 16,630
192 15 330.10 16,630 0.10 0.54 486 16,144
193 15 330.10 16,144 0.10 0.53 479 15,665
194 15 330.10 15,665 0.10 0.52 472 15,194
195 15 330.09 15,194 0.09 0.52 464 14,729
196 15 330.09 14,729 0.09 0.51 457 14,272
197 15 330.09 14,272 0.09 0.50 450 13,822
198 15 330.09 13,822 0.09 0.49 443 13,379
199 15 330.08 13,379 0.08 0.48 436 12,943
200 15 330.08 12,943 0.08 0.48 429 12,514
201 15 330.08 12,514 0.08 0.47 421 12,093
202 15 330.08 12,093 0.08 0.46 414 11,679
203 15 330.07 11,679 0.07 0.45 407 11,271
204 15 330.07 11,271 0.07 0.44 400 10,871
205 15 330.07 10,871 0.07 0.44 393 10,479
206 15 330.07 10,479 0.07 0.43 386 10,093
207 15 330.06 10,093 0.06 0.42 379 9,714
208 15 330.06 9,714 0.06 0.41 371 9,343
209 15 330.06 9,343 0.06 0.40 364 8,979
210 15 330.06 8,979 0.06 0.40 357 8,622
211 15 330.05 8,622 0.05 0.39 350 8,272
21 OCTOBER 1997
ENVIROTEK JOB NO.: ICWQPI
PAGE 5

r

MVERIAL CENTER WATER QUALITY POND NO. 1
WATER QUALITY ROUTING
TIME BEGIN W.Q. TOTAL END
TEME INCR. W.S. STORAGE ORIFICE FLOW FLOW STORAGE
PEROID [NIIN] ELEV [C.F.] HEIGHT [CFS] [C.F.] [C.F.]

212 15 330.05 8,272 0.05 0.38 343 71929
213 15 330.05 7,929 0.05 0.37 336 7,594
214 15 330.05 7,594 0.05 0.36 328 7,265
215 15 330.05 7,265 0.05 0.36 321 6,944
216 15 330.04 6,944 0.04 0.35 314 6,630
217 15 330.04 6,630 0.04 0.34 307 6,323
218 15 330.04 6,323 0.04 0.33 300 6,024
219 15 330.04 6,024 0.04 0.32 292 5,731
220 15 330.04 5,731 0.04 0.32 285 5,446
221 15 330.03 5,446 0.03 0.31 278 5,168
222 15 330.03 5,168 0.03 0.30 271 4;897
223 15 330.03 4,897 0.03 0.29 264 4,634
224 15 330.03 4,634 0.03 0.28 256 4,377
225 15 330.03 4,377 0.03 0.28 249 4,128
226 15 330.03 4,128 0.03 0.27 242 3,886
227 15 330.02 3,886 0.02 0.26 235 3,651
228 15 330.02 3,651 0.02 0.25 228 3,423
229 15 330.02 3,423 0.02 0.24 220 3,203
230 15 330.02 3,203 0.02 0.24 213 2,989
231 15 330.02 2,989 0.02 0.23 206 2,783
232 15 330.02 2,783 0.02 0.22 199 2,585
233 15 330.02 2,585 0.02 0.21 192 2,393
234 15 330.01 2,393 0.01 0.20 184 2,209
235 15 330.01 2,209 0.01 0.20 177 2,032
236 15 330.01 2,032 0.01 0.19 170 1,862
237 15 330.01 1,862 0.01 0.18 163 1,699
238 15 330.01 1,699 0.01 0.17 155 1,544
239 15 330.01 1,544 0.01 0.16 148 1;396
240 15 330.01 1,396 0.01 0.16 141 1,255

WATER Q UALITY PON D DRAIN TH E _ +/- 46 HRS.
21 OCTOBER 1997
ENVIROTEK JOB NO.: ICWQPI
PAGE 6

i
APPENDIX C
REVISED ROUTING CALCULATIONS
Emergency Drain Routing
(21 Oct 1997)
WATER QUALITY POND
AND
WETLAND FILL
PROJECT COMPLETION DOCUMENTATION
22 OCTOBER 1997
ICWQPI 28 Oct 1997 Page 7

1

J
H
H

F1

IMPERIAL CENTER WATER QUALITY POND NO. 1
EMERGENCY DRAIN ROUTING
21 OCTOBER 1997
ENVIROTEK JOB NO.: ICWQPI
ORIFICE FORMULA: Q = CA(2gH)^0.5
ONE 12" PIPE WITH GATE VALVE
C = 0.60 g = 32.2 ft/sec^2 A= 0.785 S.F.
(H MEASUR ED FROM CENTER OF PIPE)

TIIvIE THvIE BEGIN FLOW VOL END W.S.
PERIOD (NW STORAGE OUT OUT STORAGE DEPTH ELEV.
(C.F.) (C.F.S.) (C.F.) (C.F.) (m

1 5 430,213 10.59 3,177 427,036 8.34 330.00
2 5 427,036 10.57 3,171 423,865 8.31 329.97
3 5 423,865 10.55 3,166 420,699 8.29 329.95
4 5 420,699 10.54 3,161 417,538 8.26 329.92
5 5 417,538 10.52 3,156 414,383 8.24 329.90
6 5 414,383 10.50 3,150 411,232 8.21 329.87
7 5 411,232 10.48 3,145 408,087 8.18 329.84
8 5 408,087 10.47 3,140 404,947 8.16 329.82
9 5 404,947 10.45 3,134 401,813 8.13 329.79
10 5 401,813 10.43 3,129 398,684 8.11 329.77
11 5 398,684 10.41 3,124 395,560 8.08 329.74
12 5 395,560 10.40 3,119 392,441 8.06 329.72
13 5 392,441 10.38 3,113 389,328 8.03 329.69
14 5 389,328 10.36 3,108 386,220 8.01 329.67
15 5 386,220 10.34 3,103 383,117 7.98 329.64
16 5 383,117 10.33 3,098 380,019 7.95 329.61
17 5 380,019 10.31 3,092 376,927 7.93 329.59
18 5 376,927 10.29 3,087 373,840 7.90 329.56
19 5 373,840 10.27 3,082 370,758 7.88 329.54
20 5 370,758 10.26 3,077 367,681 7.85 329.51
21 5 367,681 10.24 3,071 364,610 7.83 329.49
22 5 364,610 10.22 3,066 361,544 7.80 3.29.46
23 5 361,544 10.20 3,061 358,483 7.78 329.44
24 5 358,483 10.18 3,055 355,428 7.75 329.41
25 5 355,428 10.17 3,050 352,377 7.73 329.39
26 5 352,377 10.15 3,045 349,333 7.70 329.36
27 5 349,333 10.13 3,040 346,293 7.68 329.34
28 5 346,293 10.11 3,034 343,258 7.65 329.31
29 5 343,258 10.10 3,029 340,229 7.63 329.29
30 5 340,229 10.08 3,024 337,205 7.60 329.26
31 5 337,205 10.06 3,019 334,187 7.58 329.24
32 5 334,187 10.04 3,013 331,174 7.55 329.21
33 5 331,174 10.03 3,008 328,165 7.53 329.19
34 5 328,165 10.01 3,003 325,163 7.51 329.17
35 5 325,163 9.99 2,998 322,165 7.48 329.14
36 5 322,165 9.97 2,992 319,173 7.46 329.12
37 5 319,173 9.96 2,987 316,186 7.43 329.09
38 5 316,186 9.94 2,982 313,204 7.41 329.07
39 5 313,204 9.92 2,976 310,228 7.38 329.04

fl

0

F I
'i

L

RAPERIAL CENTER WATER QUALITY POND NO. 1
EMERGENCY DRAIN ROUTING
21 OCTOBER 1997
ENVIROTEK JOB NO.: ICWQPI
T
THME TIlAE BEGIN FLOW VOL END W.S.
PERIOD MN) STORAGE OUT OUT STORAGE DEPTH ELEV.
(C.F.) (C.F.S.) (C.F.) (C.F.) (FT)

40 5 310,228 9.90 2,971 307,256 7.36 329.02
41 5 307,256 9.89 2,966 304,290 7.33 328.99
42 5 304,290 9.87 2,961 301,330 7.31 328.97
43 5 301,330 9.85 2,955 298,374 7.29 328.95
44 5 298,374 9.83 2,950 295,424 7.26 328.92
45 5 295,424 9.82 2,945 292,479 7.24 328.90
46 5 292,479 9.80 2,940 289,540 7.21 328.87
47 5 289,540 9.78 2,934 286,606 7.19 328.85
48 5 286,606 9.76 2,929 283,676 7.17 328.83
49 5 283,676 9.75 2,924 280,753 7.14 328.80
50 5 280,753 9.73 2,919 277,834 7.12 328.78
51 5 277,834 9.71 2,913 274,921 7.09 328.75
52 5 274,921 9.69 2,908 272,013 7.07 328.73
53 5 272,013 9.68 2,903 269,110 7.05 328.71
54 5 269,110 9.66 2,897 266,213 7.02 328.68
55 5 266,213 9.64 2,892 263,321 7.00 328.66
56 5 263,321 9.62 2,887 260,434 6.98 328.64
57 5 260,434 9.61 2,882 257,552 6.95 328.61
58 5 257,552 9.59 2,876 254,676 6.93 328.59
59 5 254,676 9.57 2,871 251,805 6.90 328.56
60 5 251,805 9.55 2,866 248,939 6.88 328.54
61 5 248,939 9.54 2,861 246,078 6.86 328.52
62 5 246,078 9.52 2,855 243,223 6.83 328.49
63 5 243,223 9.50 2,850 240,373 6.81 328.47
64 5 240,373 9.48 2,845 237,528 6.79 328.45
65 5 237,528 9.47 2,840 234,688 6.76 328.42
66 5 234,688 9.45 2,834 231,854 6.74 328.40
67 5 231,854 9.43 2,829 229,025 6.72 328.38
68 5 229,025 9.41 2,824 226,202 6.69 328.35
69 5 226,202 9.39 2,818 223,383 6.67 328.33
70 5 223,383 9.38 2,813 220,570 6.65 328.31
71 5 220,570 9.36 2,808 217,762 6.63 328.29
72 5 217,762 9.34 2,803 214,959 6.60 328.26
73 5 214,959 9.32 2,797 212,162 6.58 328.24
74 5 212,162 9.31 2,792 209,370 6.56 328.22
75 5 209,370 9.29 2,787 206,583 6.53 328.19
76 5 206,583 9.27 2,782 203,802 6.51 328.17
77 5 203,802 9.25 2,776 201,025 6.49 328.15
78 5 201,025 9.24 2,771 198,254 6.47 328.13
79 5 198,254 9.22 2,766 195,488 6.44 328.10
80 5 195,488 9.20 2,760 192,728 6.42 328.08
81 5 192,728 9.18 2,755 189,973 6.40 328.06
82 5 189,973 9.17 2,750 187,223 6.38 328.04
83 5 187,223 9.15 2,745 184,478 6.35 328.01

n
H
1

J
0
0

l

RMPERIAL CENTER WATER QUALITY POND NO. 1
EMERGENCY DRAIN ROUTING
21 OCTOBER 1997
ENVIROTEK JOB NO.: ICWQPI
TIlVIE TIME BEGIN FLOW VOL END W.S.
PERIOD (MIN) STORAGE OUT OUT STORAGE DEPTH ELEV.
(C.F.) (C.F.S.) (C.F.) (C.F.) (FT)

84 5 184,478 9.13 2,738 181,741 6.32 327.98
85 5 181,741 9.09 2,728 179,013 6.28 327.94
86 5 179,013 9.06 2,718 176,294 6.24 327.90
87 5 176,294 9.03 2,709 173,586 6.20 327.86
88 5 173,586 9.00 2,699 170,887 6.16 327.82
89 5 170,887 8.96 2,689 168,198 6.12 327.78
90 5 168,198 8.93 2,680 165,518 6.08 327.74
91 5 165,518 8.90 2,670 162,848 6.04 327.70
92 5 162,848 8.87 2,660 160,187 6.00 327.66
93 5 160,187 8.84 2,651 157,537 5.96 327.62
94 5 157,537 8.80 2,641 154,896 5.92 327.58
95 5 154,896 8.77 2,631 152,264 5.88 327.54
96 5 152,264 8.74 2,622 149,642 5.84 327.50
97 5 149,642 8.71 2,612 147,030 5.80 327.46
98 5 147,030 8.68 2,603 144,428 5.76 327.42
99 5 144,428 8.64 2,593 141,835 5.72 327.38
100 5 141,835 8.61 2,583 139,252 5.68 327.34
101 5 139,252 8.58 2,574 136,678 5.65 327.31
102 5 136,678 8.55 2,564 134,114 5.61 327.27
103 5 134,114 8.51 2,554 131,560 5.57 327.23
104 5 131,560 8.48 2,545 129,015 5.53 327.19
105 5 129,015 8.45 2,535 126,480 5.49 327.15
106 5 126,480 8.42 2,525 123,955 5.45 327.11
107 5 123,955 8.39 2,516 121,439 5.42 327.08
108 5 121,439 8.35 2,506 118,933 5.38 327.04
109 5 118,933 8.32 2,496 116,437 5.34 327.00
110 5 116,437 8.29 2,487 113,950 5.30 326.96
111 5 113,950 8.26 2,477 111,473 5.27 326.93
112 5 111,473 8.22 2,467 109,005 5.23 326.89
113 5 109,005 8.19 2,458 106,548 5.19 326.85
114 5 106,548 8.16 2,448 104,099 5.16 326.82
115 5 104,099 8.13 2,439 101,661 5.12 326.78
116 5 101,661 8.10 2,429 99,232 5.08 326.74
117 5 99,232 8.06 2,419 96,813 5.05 326.71
118 5 96,813 8.03 2,410 94,403 5.01 326.67
119 5 94,403 8.00 2,400 92,003 4.97 326.63
120 5 92,003 7.97 2,390 89,613 4.94 326.60
121 5 89,613 7.94 2,381 87,232 4.90 326.56
122 5 87,232 7.90 2,371 84,861 4.87 326.53
123 5 84,861 7.87 2,361 82,500 4.83 326.49
124 5 82,500 7.84 2,352 80,148 4.80 326.46
125 5 80,148 7.81 2,342 77,806 4.76 326.42
126 5 77,806 7.77 2,332 75,474 4.73 326.39
127 5 75,474 7.74 2,323 73,151 4.69 326.35

1
L

0

ICI

I I

H
n
fl
IMPERIAL CENTER WATER QUALITY POND NO. 1
EMERGENCY DRAIN ROUTING
21 OCTOBER 1997
ENVIROTEK JOB NO.: ICWQPI
TIIv1E TIME BEGIN FLOW VOL END W.S.
PERIOD (MIN) STORAGE OUT OUT STORAGE DEPTH ELEV.
(C.F.) (C.F.S.) (C.F.) (C.F.) (FT)

128 5 73,151 7.71 2,313 70,838 4.66 326.32
129 5 70,838 7.68 2,303 68,535 4.62 326.28
130 5 68,535 7.65 2,294 66,241 4.59 326.25
131 5 66,241 7.61 2,284 63,957 4.55 326.21
132 5 63,957 7.58 2,275 61,682 4.52 326.18
133 5 61,682 7.55 2,265 59,417 4.49 326.15
134 5 59,417 7.52 2,255 57,162 4.45 326.11
135 5 57,162 7.49 2,246 54,916 4.42 326.08
136 5 54,916 7.45 2,236 52,681 4.38 326.04
137 5 52,681 7.42 2,226 50,454 4.35 326.01
138 5 50,454 7.35 2,204 48,250 4.27 325.93
139 5 48,250 7.25 2,176 46,075 4.18 325.84
140 5 46,075 7.16 2,147 43,927 4.08 325.74
141 5 43,927 7.06 2,119 41,808 3.99 325.65
142 5 41,808 6.97 2,091 39,717 3.90 325.56
143 5 39,717 6.88 2,063 37,654 3.81 325.47
144 5 37,654 6.78 2,034 35,620 3.72 325.38
145 5 35,620 6.69 2,006 33,614 3.63 325.29
146 5 33,614 6.59 1,978 31,636 3.54 325.20
147 5 31,636 6.50 1,949 29,687 3.45 325.11
148 5 29,687 6.40 1,921 27,766 3.37 325.03
149 5 27,766 6.31 1,893 25,873 3.28 324.94
150 5 25,873 6.22 1,865 24,008 3.20 324.86
151 5 24,008 6.12 1,836 22,172 3.12 324.78
152 5 22,172 6.03 1,808 20,364 3.04 324.70
153 5 20,364 5.93 1,780 18,584 2.96 324.62
154 5 18,584 5.84 1,751 16,833 2.88 324.54
155 5 16,833 5.74 1,723 15,110 2.81 324.47
156 5 15,110 5.65 1,695 13,415 2.73 324.39
157 5 13,415 5.55 1,666 11,748 2.66 324.32
158 5 11,748 5.46 1,638 10,110 2.58 324.24
159 5 10,110 5.37 1,610 8,501 2.51 324.17
160 5 8,501 5.27 1,581 6,919 2.44 324.10
161 5 6,919 5.18 1,553 5,366 2.37 324.03
162 5 5,366 4.77 1,430 3,936 2.09 323.75
163 5 3,936 4.00 1,201 2,735 1.62 323.28
164 5 2,735 3.23 969 1,766 1.23 322.89
* 165 5 1,766 3.30 990 777 0.91 322.57
*166 5 777 1.71 514 263 0.59 322.25
* 167 5 263 1.04 263 0 0.42 322.08

POND DRAIN TINE = 14 HRS (+n
* FOR DEPTHS LESS THAN 1' FLOW IS MODELED AS WEIR FLOW.

ICWQPI 28 Oct 1997 Page 8
APPENDIX D
DAM HAZARD CLASSIFICATION DOCUMENTS
1) Envirotek application dated 30 March 1994
2) DEHNR, Division of Land Resources letter of approval dated 26 April 1994
WATER QUALITY POND
AND
WETLAND FILL
PROJECT COMPLETION DOCUMENTATION
22 OCTOBER 1997

1 30 March 1994

Copy,
NC Department of Environment, Health and
Natural Resources
3800 Barrett Drive
Raleigh, NC 27609
Attention: John L. Holley, Jr. P.E., CPESC
Reference: Imperial Center Water Quality Pond No. I
Dear Mr. Holley:
Envirotek, Inc.
1111 Oberlin Road
Raleigh NC 27605 USA
Telephone: [phone]
Telefax: 919-839-2255
architects engineers planners
Thank you for discussing the Imperial Center Water Quality Pond No. 1 with me last Friday.
We are recommending a "Low Hazard" classification for this pond and requesting an
"Exempt" status from the Dam Safety Law based on dam height, storage volume,
downstream improvements and the results of our analysis. We are forwarding, under cover
of this letter, the following supporting documentation:
1) A completed "HAZARD CLASSIFICATION DATA FORM FOR DAMS"
We are recommending a low hazard classification for this dam based on review of
existing and anticipated downstream developments and our analysis of the impact of
a dam breach.
2) The following maps and plans :

t

A) PROPERTY MAP - RESEARCH TRIANGLE AREA: This map shows existing
topography, properties and future improvements. The approximate location of the
proposed Water Quality Pond has been added in red.
B) OVERALL DRAINAGE BASIN MAP - This map shows the area draining to the
Water Quality Pond.
C) I)viPERIAL. CENTER MASTER PLAN- This plan shows existing and proposed
developments within Imperial Center including the proposed Water Quality Pond.
D) DETAIL GRADING PLAN - This is a progress drawing of the Phase I
construction plan for the Water Quality Pond. Phase II will involve relocating the
existing sanitary sewer and enlarging the pond to the North. Although the
enlargement is not shown on this plan, the additional storage volume was taken into
consideration in the design of the dam and the breach analysis.
7
iJ

d

Mr. John L. Holley
30 March 1994
Page 2
3) HYDROLOGIC AND HYDRAULIC ANALYSIS WITH BACKUP - We
performed a HEC-1 Hydrologic analysis, based on full development, of the areas
upstream of Crabtree Creek Watershed Project Site No. 23. We evaluated the impact
of a dam breach on the channel and the Site No. 23 pond immediately downstream
from the proposed Water Quality Pond. Our analysis indicates a relatively
instantaneous breach will result in a 1.4' increase in the channel water surface profile
and an increase in the pond level at Project Site No. 23 of 1.2.
We believe damage due to a dam breach would be limited to uninhabited agricultural lands
as the land exists today. We anticipate this area will experience growth within the life of this
structure. We believe existing regulations for development adjacent to and within flood
hazard areas are adequate to protect new structures from damage due to a failure and
current design standard are adequate to protect proposed (or future) utilities and highways.
We recommend designers of new facilities consider the impact of dam failure in the design
of individual projects.
Our recommendation is this structure receive a "Low Hazard" Classification and be
determined exempt from the Dam Safety Law. We are asking for your concurrence, in
writing, on the Low Hazard classification and exempt status of the Imperial Center Water
Quality Pond No. 1. Please call me if I can be of any assistance.
Sincerely,

'
Ed Sconfienza, P.E
Enclosures
ICWQPI EFS:eyb
cc: Harry iNlassey

IMPERIAL CENTER
WATER QUALITY POND NO. 1
' JOB CODE: ICWQPl
25 MARCH 1994
' DEPTH - DURATION - 100 YR FREQUENCY
(REF: HYDRO-35 & TP-40)
5 MIN 0.81"
' 15 MIN 1.81"
30 MIN 2,96"
1 HR 322'
' 2 HR 4.45
3 HR 4.9Z"
6 HR 5.89"
12 HR 6.92'
' 24 HR 7.92"
6 HR PMP (10 SQ. MI.) 29.45
' SOIL CHARACTERISTICS
(SCS SOIL SURVEY)
' NOTE: SOILS PREDOMINATELY CREEDMOR SANDY LOAM
(HYDROLOGIC SOIL CLASSIFICATION "C)
AVAILABLE WATER CAPACITY: 0.11- 0.12 IN/IN
' PERMEABILITY: 2.0 - 63 IN/HR (GOOD)
INITIAL ABSTRACTION
ASSUME 6" SOIL DEPTH (CONSERVATIVE)
INITIAL ABSTRACTION = (0.12 IN/IN) (6 11,4) = 0.72"
Cn CALCULATION (REF: TR-55)
TABLE 22: PREVIOUS Ca = 74 ou s
(GRASSCOVER 75% OPEN SPACE)
FIG 22: COMPOSITcCn = 86
(53% IMPERVIOUS)
5 ICWQPi imperial Center Water Quality Pond 1 30 March 19%
I i Report EM-cp Page 1

'
IMPERIAL CENTER
WATER QUALITY POND NO. 1
JOB CODE: ICWQPI
24 MARCH 1994

BASIN LAG CALCULATION

tug 10.8 + W-7
1900 y0-'
BASIN 1
tug = (2100)08(2.63)a? = 1.12 HR
' 1900 (1.25)0-'
BASIN 2
tug = (3800)0.8(2.63)0.7 = 0.98 HR
1900 (0.6)0-'

BASIN 3
0
8
0
7
tag = (5400)
.
(2.63)
- = 0.90 HR
1900 (1.25)0-'

° ICWQPi Imperial rater Water Quality Pond 1 30 arch 1994
1 I Report EFS:eyb Page 2

IMPERIAL CENTER
WATER QUALITY POND NO. 1
JOB CODE: ICWQPI
24 MARCH 1994
STAGE-STORAGE CALCULATION
ATION
322
324
326
328
330 (Perm Pool
3.70 AQ
332
336
SURFACE INCREMENTAL CUMULATIVE
AREA STORAGE STORAGE
[SF] [CF] [AC-FT]
52,720 -0-
66,992 119,712 2.75
84,720 151,712 623
115,312 200,032 10.82
161,040 326,640 17.17
165,600 409,500 34.07
248,700 492,600 4538
CUMULATIVE
STORAGE
[CF]
-0-
119,712
271,424
471,456
747,808
1,483,948
1,976,548
ICWQPI Imperial Center Water Quality and 1 30 arch 1
Report EF&eyb Page 3

IMPERIAL CENTER
WATER QUALITY POND NO. 1
JOB CODE: ICWQPl
24 MARCH 1994
STAGE-DISCHARGE CALCULATION
WEIR - Q=850 Han
ORIFACE = 1.17 H1n
ELEV ORIFACE WEIR OVER TOTAL
FLOW FLOW FLOW FLOW
330 -0- -0- -0- -0-
3305 .83 -0- -0- ,83
331.0 1.17 -0- -0- 1.17
3315 1.43 -0- -0- 1.43
332 1.65 965 -0- 98.2
3325 1.85 273 -0- 274.9
333 2.03 502 -0- 504
3335 2.19 772 -0- 774
334 234 1079 -0- 1081
3345 2.48 1419 300 1722
335 2.62 1788 850 2641
3355 2.74 2184 1562 3748
336 2.87 2606 2404 5013
1 pe Center Water Quality oaC 1 30 March 1
I Report EK-cyb Pal

ri

11

IMPERIAL CENTER
WATER QUALITY POND NO. 1
JOB CODE: ICWQPI
24 MARCH 1994
DAM BREACH WAVE CALCULATION
ELEVATION INCREASE ON CRABTREE CREEK PROJ. NO 23
PROJECT NO. 23 - 26.26 ACRE (SURFACE AREA)
W.Q. POND NO. 1 - 31.72 AC: FT (BREACH VOL)
31.72 AC - FT = 1.21'
26.26 AC NET INCREASE ON NORMAL POOL W.S. (ASSUMING NO.
PASS THROUGH OR CHANNEL STORAGE)
ELEV INCREASE IN CHANNEL BETWEEN W.Q. POND NO. 1 & PROD. NO 23 POND
NOTE: CHANNEL SLOPE 0.6%;
SECTION VARIABLE; USE 20' TRAPEZOIDAL CHANNEL WITH 2:1 SIDES & n = 0.03
(CONSERVATIVE - WIDTHS ARE TYPICALLY WIDER & SIDES SHALLOWER)
PEAK FLOW WITH DAM - 1689 CFS
dloo = 5.65; v1oo = 9S FPS
PEAK FLOW WITH BREACH = 2574 CFS
d100+Breach = 7.05'; v100+Bmach = 10.7 FPS
INCREASE IN CHANNEL DEPTH OF FLOW = 1.4'
ICWQPI Imperial Center Water Quality Pond 1 30 March
Report EFS eyb Page 5

HAZARD CLASSIFICATION DATA FORM FOR DAIIS
DS..,
DAM NW- I meper i a 1 Center - WO PorlA No. 1 coumTy D Lrham
RIVER/STREAM Crabtree Creek QUADRANGLE .ary
DAM HEIGHT

I I

u

11

i 2.0I SURFACE AREA(ACRES) 5.6 STORAGE CAPACITY(ACRE FT. )_34 Ac. Ft.
PRIMARY DOWNSTREAM LAND USE.
FX I WOODLAND a AGRICULTURAL a RESIDENTIAL INDUSTRIAL/COt4(ERCTAL
IMPRO'!F?UMS:
DCQNSTRE M
?
1 I DWELLDIGS BUILDIPGS a ROADS UTILITIES
DOWNSTREAM IKPROVEMENT DATA:
TYPE DISTANCE FLOODPLA.TN CHANNEL ELEVATION ABOVE BREACH WAVE CULVERT/BRIDGE TRAFFIC SIGHT
IMPROVE20ri MWNSPREAM WTIDTH SLOPE FLOODPLAIM ELEVATION DIMENSIONS COt7N". DISTANCE
Crabtree 3900', Varies 0.6' +/-305' /=306.3' i
Cr. 2501 _
Proj. 800'
No. 23

I
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I
-------------
DESCRIBE POTTEYML FOR LCSS OF LIFE AND SIROCMAL OR ENVIBOCAL DAJwaGE TO EX M73G OR POTE MIAL F=RE
D(7K'''STR7 X LxrsOVErD?r S: Crabtr?P Cr !. Pro,?P?r No 23 i s +/ X900• downstream from the __
proposed proterr =iTP- The inteveninq_ararpredominantly forested and un-_'.
lPveloped_ Future development such as the proposed Outer Loop could be impacted.
Po' nti 1 for toss of life and structural or environmental damage at the current
•state of development is slight
RECOM LADED HAZARD CLASSIFIC1TIM: nx LOG a IM'ERKEDIATE a HIGH
BY -. TITLE _#- N & V0 r= P-? DATE
' CONCURRED BY TITLE DATE
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RUNOFF SUMMARY
FLOW IN CUBIC FEET PER SECOND
TIME IN HOURS, AREA IN SQUARE MILES
PEAK TIME OF AVERAGE FLOW FOR MAIIMUM PERIOD BASIN MAIIMUM TIME OF
OPERATION STATION FLOW PEAK 6-HOUR 24-HOUR 72-HOUR AREA STAGE KAI STAGE
HYDROGRAPH AT SUBI 1040. 9.50 432. 188. 188. .74
ROUTED TO RES1' 1036. 9.67 432. 183. 183. .74 333.93 9.67
ROUTS) TO OUTI 1035. 9.93 4I5. 158. 158. .74
HYDROGRAPH AT SU32 722. 9.33 265. 115. I15. .45
2 COMBINED AT OUT1,2 1689. 9.50 664. 273. 273. 1.19
HYDROGRAPH AT SUB3 1268. 9.33 466. 203. 203. .80
2 0D 313) A' OUT123 2925. 9.50 1124. 475. 475. 1.99
3UBBASIN RUNOFF DATA

RUXOFF SUMMARY
FLOW IN CUBIC FEET PER 33COND
TIME 19 HOURS, AREA IN SQUARE MILES
IV\
PEA[ TINE OF AVERAGE FLOW FOR NAIIMUM PERIOD BASIS NAIINUM TIME OF
OPERATIOW STATI09 FLOW PEA[ 6-HOUR 24-HOUR 72-HOUR AREA STAGE NAT STAGE
HYDROGRAPH AT SUB1 1040. 9.50 432. 188. 188. .74
ROUTED TO RESI 2130. 9.67 484. 20:. 201. .74 333.66 9.27
ROUTED TO BRI1 1921. 9.67 484. 200. 200. .74
HYDROGRAPH AT SUB2 722. 9.33 265. I15. 115. .45

2 COMBINED AT OUT1-2

2574.
C

9.67
D

748.

316.

316.

1.19
HYDROGRAPH AT SUBS 1268. 9.33 466. 203. 203. .80
2 COMBINED AT OUT123 3722. 9.67 1213. 518. 518. 1.99

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

T__
' State of North Carolina
Department of Environment,
' Health and Natural Resources
Raleigh Regional Office
I James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
Boyce A. Hudson, Regional Manager

r
A Y!W
IVr A
4jr*T
Adbodsoldaft
ED EHNR
DIVISION OF LAND RESOURCES
April 26, 1994
Envirotek
1111 Oberlin Rd.
Raleigh, NC 27605
ATTN: Ed Sconfienza,
P. E.
:APR 27 94 ;1r)P
F.ex `e 6eze. SaAG?e2L
9A4 1" G31°?
RE: Proposed Imperial Center
Stormwater Pond #1
Durham County
Dear Ed:
As requested, I have reviewed the maps and details you have
submitted for the subject site, and I have performed a field
inspection to review the proposed hazard classification for the
structure. As we have discussed, the proposed low hazard appears
appropriate considering the existing downstream conditions as
well as the anticipated development for the forseeable future.
In addition, since the height of the dam is designed to be 14'
the dam will therefore be exempt from the plan approval
requirements of the NC Dam Safety Act (Act).
Although the hydrologic computations were not reviewed in
detail, the results appear consistent with the characteristics of
the drainage area and the design assumptions. I encourage you to
' complete the design following the standards established in the
Act and in consideration of the requirements of the NC
Sedimentation Pollution Control Act as enforced by Durham County.
Please be reminded that all hazard classifications are
subject to change in light of future downstream development that
may occur beyond that anticipated at this time. A change to high
' hazard in the future could bring the dam back under the
jurisdiction of the Act.
3800 Barrett Drive, Suite 101, Raleigh, North Carolina 27609 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post-consumer paper

Mr. Ed Sconfienza, P.E.
April 26, 1994
2
Please do not hesitate to contact me regarding any questions
you might have.
Sincerely,
hn L. Holley, Jr., P.E., CPESC
gional Engineer
Land Quality Section
JLH
cc: Tom Kagarise, P.E.

till Soil & Environmental Consultants, Inc.
3818 Bland Road ¦ Raleigh, North Carolina 27609 ¦ [phone] ¦ Fax [phone]
February 23, 1993
U.S. Army Corps of Engineers --
Raleigh Field Office, Regulatory Branch W -TG
Attn: Mr. Eric Alsmeyer
6512 Falls of the Neuse Road, Suite 105
Raleigh, NC 27615-6846 2 6 93
Dear Mr. Alsmeyer:
The purpose of this letter is to request Corps approval for the
placement of fill material in Waters of the U.S. at the Imperial
Center Property, Wake County, North Carolina. You have already
visited the site and approved our wetland delineations in the
affected areas. One of the attached blueprints shows the
locations of Wetlands and Waters of the U.S. as approved on the
property, while the second shows proposed "fill" sites for roads,
buildings, parking, etc., and the areas of Waters of the U.S. to
be impacted at each fill site. The total fill area under
Nationwide Permit 26 (Area 2 and 3 on map) is 0.30 acres in areas
above headwaters. An additional .175 acres will be impacted
utilizing Nationwide Permit 14 for road crossings as shown on the
attached plan (see Area 1 and 4).
Other wetland areas on the property have been delineated and are
shown on the enclosed plans. When development plans are
completed, additional applications for the appropriate permits
will be submitted. "White" areas on the first blueprint are
properties that are already developed and are owned by others.
We will apply for a Nationwide 26 permit for total impacts in
excess of 1 acre as soon as project design plans are complete. We
have worked with the developer and architect (Envirotek)
extensively to minimize total impacts. However, it is imperative
that we moved ahead with this initial 0.30 acre impacts and the
two road crossings to keep the project on schedule. The road
crossing will allow access to the project site via an existing
developed tract without impacts to the main stream on-site while
the permanent public road is under construction. The crossing
would be difficult further up the tributary where wetlands are
narrower because of the severity of slopes in that area which are
not safe for heavy equipment to cross (e.g. dump trucks).
We realize that "prior notification" is not required for impacts
Soil/Site Evaluation ¦ Mapping and Physical Analysis ¦ Wetlands Mapping and Mitigation ¦ Environmental Audits
On-Site Waste Treatment Systems, Evaluation and Design

C

of less than 1 acre above headwaters, but we want to keep you
informed of our work so that it does not negatively affect our
next permit application. For your information, DEM has been
notified of our proposed methodology for handling this 0.30 acre
application the Nationwide 14 crossings and our eventual
Nationwide Permit applications. They will review the entire
project in detail when processing the 401 Water Quality
Certification for our next permit application.
Please contact me if you have questions or require additional
information. We appreciate your willingness to work with us
toward the economical and timely completion of this project.
Sincerely,
Cg" 6?- ?iKad"
Kevin C. Martin,
President
Enclosure
cc: David Franklin, U.S. Army Corps of Engineers
Karl Shaffer, DEM
N.C. Cultural Resources
U.S. Fish and Wildlife Service
National Marine Fisheries Services
David Lasley, Envirotek

? soil & Environmental Consultants, Inc.
3818 Bland Road ¦ Raleigh, North Carolina 27609 ¦ [phone] ¦ Fax [phone]
February 23, 1993

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NCDEHNR - DEM
Attn: Mr. John Dorney
PO Box 29535
Raleigh, NC 27626
Dear Mr. Dorney:
The purpose of this letter is to request a Section 401 Water
Quality Certification for the project known as Imperial Center.
The project is located as shown on the enclosed plans.
Our firm has performed the detailed wetland delineation shown on
the attached maps. We have also had these delineations approved
by Mr. Eric Alsmeyer of the U.S. Army Corps of Engineers. We are
currently working with the owner and architect (Envirotek) to
prepare an application covering the entire site. As soon as
development plans are complete we will make additional
applications. Please note that areas shown in white are developed
tracts owned by others.
Fill in some wetlands will be required to utilize the property for
a commercial development. (See attached map). As you can see,
available uplands have been utilized as much as possible so that
wetland impacts have been minimized.
It will be necessary to fill 0.30 acres (see map) of
jurisdictional wetlands above headwaters for placement of the
currently proposed facilities. Additional acreage (see map) will
need to be impacted under Nationwide 14 for road crossings.
Please note that the temporary crossing is needed to allow access
to the construction site via an existing facility during
construction of the permanent public road. The crossing could not
be placed further upstream on the small tributary where wetlands
are more narrow because the steep slopes there are not accessible
to heavy equipment (e.g. Dump trucks). In order to keep the
project on its tight schedule we need to have approval for these
impacts before planning on the rest of the project is complete.
We have completed enough work to determine that we should be
eligible for Nationwide Permits 26 and 14 from the Corps
considering its current "policy" of total allowable impacts.
However, at this time, we do not have final development plans for
Soil/Site Evaluation ¦ Mapping and Physical Analysis ¦ Wetlands Mapping and Mitigation ¦ Environmental Audits
On-Site Waste Treatment Systems, Evaluation and Design

1

the entire project complete. Therefore, any application for the
project as a whole at this time would be premature.
We will submit for another 401 for the project when development
plans are complete. We realize that we are not required to notify
you for impacts less than 1/3 acre under Nationwide Permit 26, but
are doing so anyway so no confusion arises when additional
applications are made.
Please call if you have any questions or require further
information. We appreciate your willingness to work with us
toward the economical and timely completion of this project.
Sincerely,

u
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Kevin C. Martin,
President
Enclosures
cc: David Franklin, U.S. Army Corps of Engineers
Karl Shaffer, DEM
N.C. Cultural Resources
U.S. Fish and Wildlife Service
National Marine Fisheries Services
David Lasley, Envirotek

I

DEM ID: ACTION ID:
JOINT APPLICATION FORM FOR
NATIONWIDE PERMITS THAT REQUIRE NOTIFICATION TO THE DISTRICT ENGINEER
' NATIONWIDE PERMITS THAT REQUIRE SECTION 401 CERTIFICATION CONCURRENCE
NATIONWIDE PERMITS THAT REQUIRE INDIVIDUAL SECTION 401 CERTIFICATION
WILMINGTON DISTRICT ENGINEER WATER QUALITY PLANNING
CORPS OF ENGINEERS DIVISION OF ENVIRONMENTAL MANAGEMENT
DEPARTMENT OF THE ARMY NC DEPARTMENT OF ENVIRONMENT, HEALTH,
P.O. BOX 1890 AND NATURAL RESOURCES
WILMINGTON, NC 28402-1890 P.O. BOX 29535
ATTN: CESAW-CO-E RALEIGH, NC 27626-0535
' Telephone [phone] ATTN: MR. JOHN DORNEY
Telephone [phone]
ONE (1) COPY OF THIS COMPLETED APPLICATION SHOULD BE SENT TO THE CORPS OF
ENGINEERS. SEVEN (7) COPIES SHOULD BE SENT TO THE N.C. DIVISION OF
ENVIRONMENTAL MANAGEMENT. PLEASE PRINT.
' 1. OWNERS NAME : Tri Properties Inc.
2. OWNERS ADDRESS: Attn: Harry Massey Jr.
PO BOX 1 067
Raleigh, NC 761
' 3. OWNERS PHONE NUMBER (HOME): (WORK): [phone]
4. IF APPLICABLE: AGENT'S NAME OR RESPONSIBLE CORPORATE OFFICIAL, ADDRESS,
PHONE NUMBER: _qni 1 and Rmri rnnmant-al rnnattil Cant-c., Tnr
RalPigh? "Njr 77ring i9U-9-L-L/
I

5. LOCATION OF PLANNED WORK (ATTACH MAP).
COUNTY: Durham
NEAREST TOWN OR CITY: r MorriGvi1 1 e
SPECIFIC LOCATION (INCLUDE ROAD NUMBERS, LANDMARKS, ETC.):
(See Attached Vicinity Mar) on Blueprints)
6. NAME OF CLOSEST STREAM/RIVER: Unnamed Tributary of Stirrup Iron Creek
7. RIVER BASIN: Neu se
' 8. IS THIS PROJECT LOCATED IN A WATERSHED CLASSIFIED AS TROUT, SA, HQW, ORW,
WS I, OR WS II? YES [ ] NO [X]
9. HAVE ANY SECTION 404 PERMITS BEEN PREVIOUSLY REQUESTED FOR USE ON THIS
PRO PERTY? YES [ ] NO [XI
IF YES, EXPLAIN.
' Surveyed
10. ESTI-MA-T-E-B TOTAL NUMBER OF ACRES OF WETLANDS LOCATED ON PROJECT SITE:
9.42
Ll

-2-

11. NUMBER OF ACRES OF WETLAND IMPACTED BY THE PROPOSED PROJECT:
FILLED: .3 (Nationwide 26)r.175 (Nationwide 14s)
DRAINED:
FLOODED:
EXCAVATED:
TOTAL IMPACTED: , .175
12. DESCRIPTION OF PROPOSED WORK (ATTACH PLANS): Fill associated with
construction of public road, tem orar road and comme-rnial
development with associated parking, buildings, and utilities,
13. PURPOSE OF PROPOSED WORK: Allow utilization of upland for commercial
development.
14. STATE REASONS WHY THE APPLICANT BELIEVES THAT THIS ACTIVITY MUST BE
CARRIED OUT IN WETLANDS. ALSO, NOTE MEASURES TAKEN TO MINIMIZE WETLAND
IMPACTS. ,,Ae4;tz : ,e ed let_tez rom S.&.EC.
Nc.`Note a _ sewer ;sere-.ng pr:gggsed .-buildi:ftq!wi1:1 •=tie into

15. YOU ARE REQUIRED TO CONTACT THE U.S. FISH AND WILDLIFE SERVICE
(USFWS) AND/OR NATIONAL MARINE FISHERIES SERVICE (NMFS) REGARDING THE PRESENCE
OR ANY FEDERALLY LISTED OR PROPOSED FOR LISTING ENDANGERED OR THREATENED
SPECIES OR CRITICAL HABITAT IN THE PERMIT AREA THAT MAY BE AFFECTED BY THE
PROPOSED PROJECT. HAVE YOU DONE SO? YES [ A NO [ ]
RESPONSES FROM THE USFWS AND/OR NMFS SHOULD BE ATTACHED.
16. YOU ARE REQUIRED TO CONTACT THE STATE HISTORIC PRESERVATION OFFICER
(SHPO) REGARDING THE PRESENCE OF HISTORIC PROPERTIES IN THE PERMIT AREA WHICH
MAY BE AFFECTED BY THE PROPOSED PROJECT?:.
HAVE YOU DONE SO? YES [x] NO [ ]
RESPONSE FROM THE SHPO SHOULD BE ATTACHED.
17. ADDITIONAL INFORMATION REQUIRED BY DEM:
A. WETLAND DELINEATION MAP SHOWING ALL WETLANDS, STREAMS, AND LAKES ON
THE PROPERTY.
B. IF AVAILABLE, REPRESENTATIVE PHOTOGRAPH OF WETLANDS TO BE IMPACTED BY
PROJECT.
C. IF DELINEATION WAS PERFORMED BY A CONSULTANT, INCLUDE ALL DATA SHEETS
RELEVANT TO THE PLACEMENT OF THE DELINEATION LINE.
D. IF A STORMWATER MANAGEMENT PLAN IS REQUIRED FOR THIS PROJECT, ATTACH
COPY.
E. WHAT IS LAND USE OF SURROUNDING PROPERTY? . Commercial or undevel sped
F. IF APPLICABLE, WHAT IS PROPOSED METHOD OF SEWAGE DISPOSAL?
2/21/93
????? OWNERS S SIGNATURE DATE

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Name: Tri Properties, Inc.
Address: P o sox 19067
Address: Raleigh NC 27610,
Phone: 82g-2495
Project Name/ Description: Imperial Center Southwest Addition
Date: 22 February 1993
The Department of the Army
U.S. Army Corps of Engineers
Wilmington District
P O Box 1890
Wilmington, NC 28402
Attn: Eric Al smeyer
Field Office: Raleigh
Re: Wetlands Related Consulting and Permitting
To Whom It May Concern:
I, the current project owner, hereby designate and authorize Soil and Environmental
Consultants, Inc. to act in my behalf as my agent in the processing of permit applications;
to furnish upon request supplemental information in support of applications, etc. from this
day forward for the Southwest Section of Imperial Center identified by Drawing No. WL-1
dated 11 February 1992 and prepared by Envirotek, Inc. This the 22nd Clay of
February , 1993
Own is am
Title:
cc: Mr. John Dorney
N.C. Department of EH & NR
Division of Env. Mgt.
Water Quality Planning
P O Box 29535
Raleigh NC 27626
Mr. Kevin Martin
Soil and Environmental Consultants, Inc.

"AYES STATE OF NORTH
tffE INTERIOR DEPARTMENT OF NATURAL AND
IJRVEY RALEIGH, NORTH C
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ICWQP1 28 Oct 1997 Page 9
APPENDIX E
WETLAND FILL DOCUMENTATION
1) 23 Feb 1993 S&EC letter to Alsmeyer/Corps of Engineers
2) 23 Feb 1993 S&EC letter to Dorney/NCDEHNR-DEM
3) 15 Mar 1993 DEHNR letter [Project #93128]
4) 22 Jul 1993 Corps (Wright) letter of approval for filling 0.475 acre
5) 14 Oct 1993 S&EC letter to Alsmeyer and Dorney
6) 22 Nov 1993 S&EC letter to Corps
7) 3 Dec 1993 Corps (Wright) letter of approval for filling 3.455 acres
8) 6 Dec 1993 DEHNR-DEM (Dorney) letter to TriProperties [Project #93931]
9) 9 Dec 1993 S&EC request for modification to Dorney/Corps
10) 25 Jan 1994 DEHNR-DEM (Howard) 401 Water Quality Certification to fill 2.98 acres
11) 18 Jul 1994 Envirotek letter to Thomas/DEM
12) 18 Jul 1994 Envirotek letter to Brogden/Durham Engineering
13) 18 Jul 1994 Envirotek letter to Lambeth/Durham County
14) 23 Jun 1995 S&EC letter to Corps requesting reauthorization
15) 14 Jul 1995 DEHNR-DEM 401 Water Quality Certification to fill 2.88 acres
16) 21 Jul 1995 Corps (Wright) revised authorization for filling 2.98 acres
17) 17 Jun 1996 DEHNR-DEM Stormwater Plan Approval
18) 29 Nov 1996 S&EC letter to Corps
19) 5 Dec 1996 Envirotek letter to Corps
20) 12 Dec 1996 DEHNR-DEM 401 Certification filling an additional 0.1 acre of wetland
21) 19 Dec 1996 Corps (Jolly) letter confirming validity of existing fill permits
WATER QUALITY POND
AND
WETLAND FILL
PROJECT COMPLETION DOCUMENTATION
22 OCTOBER 1997
11
1 DATA FORM
ROUTINE ONSITE DETERMINATION METHOD Si? r Z
' TIRE: x:12 DATE: (e/ 3yo _U COUNTY: _-Dur amt
NEAREST TOWN
: _ Da r Aam WATERWAY: Tr, b u4& r S+i r ry I rou Cree f
?. ? R
DAD:
-
QUAD: LOCATION: Researc4 Tr;Gn,4Ie Part [ Ttmper(al Ce,x4)
PROPERTY OWNER: (NAME/ADDRESS) PARTY DOING WORK: (NAME/ADDRESS)
' ENVJP6TEK . Iuc Sol I C ZA.'V;ro,vh.r„rta/ C6.)Sa ?aafs
"L l 0br_r1inl Qd 3A I A 131aud Rd.
' Rale?s IV C 27G D? Qa/ri* b , A)C ,271.o4
?tT: Mr Tu,., 5;ddh;cf.al
P1I0NE: ( qIq )-n Z - PHONE: (4'l4)74o - Q//7
OTHER LNOIVLDIJAL.8 PRESENT:

IS PROPERTY UNIFORM OR SEPARATE DISCRETE ,/ VEGETATIVE UNITS

1 ------------------------------
Do normal environmental conditions exist at the plant community? - _
/
Yes v
Na (If no, explain on back)
Has the vegetation, soils, and/or hydrology been significantly disturbed?
Yes No V (If yes, wpiain on back)
1 VEGETATION: (IN ORDER OF DOMINANCE, DRAW LINE ABOVE NON-DOMINANT SPECIES)
TREYS: SPECIES---X COVER--INDICATOR GROUND COVER: SPECIES-% COVER-INDICATOR
I
• PIPL45 TAEDq Go% FAC 1.
2
1 . acER Rua R14M
2.
s% FAC
3•L/RIODENDRo
vTct
,
LIPIFER4 5V
4. FAC 4.
5. 5.
1 SAPLINGS/SHRUBS: 6.
1. CORNaS FLOkiDA #0% F,4cu 7.
1 2. RCER QugRu?n to 'I, FAC B.
3. WOODY VINES:
4. 1. V I T! 5 /ale FAC
5. 2.
Percent of dominant species that are OBL,. FACW, and/or FAC ? SD % 1
1 Is the hYdrophytic vegetation criterion met? Yes V No
Rationale:

1

17,

SOILS
Seriestphase: t- r d M 66y Subgroup:2 A Q. i //o ,n /L a• Ifs
isthe soil on the hydric soils list? Yes No V Undetermined
Isthe soil a Hislosoi? Yes No %e Histic epipedon present? Yes No w
Isthe soil: Mottled? Yes No Gleyed? Yes No
Matrbc Color. _.! o_yTZ7A Mottle Colors: 2. S YR ?'T-d- /O Y,Q GI/
Other hydric soil Indicators:
is the hydric soil criterion met? Yes No V'
Rationale:
HYDROLOGY
Is the ground surface inundated? Yes No V Surface water depth:
Is the sod saturated? Yes No T
Depth to free-standing water in pittsoil probe hole: 3
List other field evidence of surface inundation or soil saturation.
Is the wetland hydrology criterion met? Yes No ?
Rationale: Qbeq--tz>.
JURISDICTIONAL DETERMINATION AND RATIONALE
Is the plant community a wetland? Yes No %,-'
Rationale for jurisdictional decision: oes ,vo incc?' So;/
lax d ro /oTV L' rc err c
PHOTOS TAKEN: YES NO AUTHORITY: 10 404 10/404_ NONE_
JURISDICTION: ABOVE HEADWATERS _ ISOLATED ADJACENT NWP 0
' DATA FORM
ROUTINE ONSiTE DETECTION METHOD S 1'4
? 1
TIME : DATE: 1Y_ 3G l 41? CGUNTY: D u r A a n•,
' NEAREST TOWN: Durham WATERWAY: T'r'r u'tarv: St?rrao -SreN Creek
QUAD: LOCATION: Researcf; T'rra.usl Pr-rt C IMDL•rca 11CN4Yr
PROPERTY OWNER:(NA14E/ADDRESS) PARTY IwING WORK:(NAME/ DDRESS)
MVIROTEK,Itic. 56;1 EVyj/rzymey44/ Cows itt4Qu?s
/l/l 4bPfl%V red 3ftre 131awd Aed
clei4A-AC 27At9 iQ
ale,;F VC A740 4
_
Alf : A9r T4nn S/dd hicAa i
PtIUNf : (9 rq )*31 - GSA PIIONE: (9191) 790 - g117
OTHER INDIVEDUA1.IS PRESENT:
'
IS PROPERTY UNIFORM OR SEPARATE DISCRETE ? VEGETATIVE UNITS
-------------------------------- -----
Do normal environmental conditions exist at the plant community?
Yes " No (N no, explain on back)
Has the vegetation. sobs, and/or hydrology been significantly dlsdtrrbed?
Yes No ? (it YtdL explain on back)
VEGETATION: (IN ORDER OF DOMINANCE, DRAW LINE ABOVE NON-DOMINANT SPECIES)
TREES: SPECLES---% COVER--INDICATOR GROUND COVER: SPECIES-X COVER-INDICATOR
1. LIRIODENDRov TaRlPIF,>aQA Yd q, FAC 1• 14YPORA MA0,e6S7 AC //YQ 70% 06L
' 2. ACER RUSRNrt 2.OSMUMDA CrafNAR&NEA C-pe FACw
FAC
3.FRgxlacis poVVSycVA?V.,c,o
3.w06D0VA9D1A 4REDL.ATA ST., OgL
4. tax, F-4cw 4
. CAREx
5. 5. Sqe FACw
' SAPLINGS/SHRUBS: 6.
1• FRAXtVaS Pev1Syi:vAwim IS?e g4 w 7.
2. 8.
' 3. WOODY VINES:
4. 1. Smi LA A 2djo FAC
5. 2.
percent of dominant spec ias that are OBI- FACW, and/or FAC /6 0
' Is the hydrophytic vegetation criterion met? Yes v_ No
Rationale:
SOILS
.
4e- F I u vo o u e,y4s
Sodasiphase: W EAA D k E E -Subgroup :2
.
Is the soil on the hydric soils list? Yes ? No Undetermined

Yes No v
Is the soil a Histosol? Yes No w Histic epipedon present?
' No
Is the soil Mottled? Yes No Gleyed? Yes
-
matrix color I& %,??7 Mottle Colon: 1A.,`Le?
Other hydric sal tndlatcrs:
Is the hydric soti criterion met? Yes ? No
-
-
' Rationale: S ra 5,& j e_ I h i y 1.,
w
a r :)Me
HYDROLOGY
Is the ground surface inundated? Yes No ? Surface water depth:
Is the soil saturated? Yes ? No 2SJ1
Depth to free-standing water in pittsoil probe hole:
List other field evidence of surface inundation or soli saturation.
is the wetiand hydrology criterion met? Yes ? No
Rationale: g e, a ll eou tree, 4-ru Z k t
' JURISDICTIONAL DETERMINATION AND RATIONALE
Is the plant community a wetland? Yes ? No
' Rationale for jurisdictional decision: Ale Th r e {aria 1?1c ?
PHOTOS TAKEN: YES NO AUTHORITY: 10 404 10/404_ NONE_
JURISDICTION: ABOVE HEADWATERS - ISOLATED ADJACENT NWP 0
' ?? ?' sr?rf o e t z
MAR 1 8 93
' State of North Carolina
Department of Environment, Health, and Natural Resources
' 512 North Salisbury Street * Raleigh, North Carolina 27604
James B. Hunt, Jr., Governor Jonathan B. Howes, Secretary
' March 15, 1993
Tri Properties,Inc.
Attn: Henry Massey, Jr.
P.O. Box 19067
Raleigh, N.C. 27619
' Dear Mr. Massey:
' Subject: Proposed fill in Wetlands or Waters
Commercial development
Durham County
Project # 93128
' Upon review of your request for 401 Water Quality
Certification to place fill material in 0.48 acres of wetlands or
waters which are tributary to Stirrup Iron for commercial
developement located at NC 54 in Durham County, we have
determined that the proposed fill can be covered by General Water
' Quality Certification No. 2671 and 2732 issued January 21, 1992.
Copies of the General Certifications are attached. These
Certifications may be used in qualifying for coverage under Corps
of Engineers' General Permit Nos. 14 and 26. Stormwater
management will be required before additional development occurs
on this site.
If you have any questions, please contact John Dorney at
919-733-1786
Sincerely,
reston Howar , Jr. P.E.
' 93128.1tr
Attachment
' cc: Wilmington District Corps of Engineers
Corps of Engineers Raleigh Field Office
Raleigh DEM Regional Office
Mr. John Dorney
' Central Files
Kevin Martin, Soil and Environmental Consultants
' P.O. Box 27687
, Raleigh, North Carolina 27611-7687 Telephone [phone] Fax # [phone]
t An Equal Opportunity Affirmative Action Employer
7

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NUP?f3i,ti: Z6 li%;AD4dA' _'
OR CQKPS OF ENG1r1EE;?.S NAT I(ii+yYIDh PERMIT
AND ISOLATED WETLANDS)
This General Certification is issued in conformity wits-. ::.he
requirements of Section 901, Public Laws 92-500 and 95-217 c'-' the
United States and subject to the North Carolina Division of Envi-
ronmental Management Regulations in 15A NCAC 2H, Section .0500
and 15A NCAC 2B .0109 and .0201 for the discharge of fill, mE:e-
rial to navigable waters and adjacent wetland areas which arE?
above the headwaters or to ?-.etland areas that are not a part of
the surf ace tributary system to interstate waters or navigable
waters of the United States (i.e., isolated wetlands) as
described in 33 CFR 330 Appendix. A (B) (26) of the Corps of Engi-
neers regulations (i.e., Nationwide Permit No. 26) The category
of? activities shall include any fill activity in these headwaters
and isolated wetland and water areas where the activity does not
result in the loss or substantial modification of 10 acres or
more of waters of the United States, including wetlands. This
Certification replaces Water Quality Certification Number 2176
issued on November 5, 1987.
The State of North Carolina certifies that the specified
category of activity will not violate Sections 301, 302, 303, 306
and 307 of the Public Laris 92-500 and 95-217 if conducted in
accordance with the conditions hereinafter set forth.
Conditions of Certification:
1. Proposed fill or substantial modification of greater than
one-third of an acre of such waters, including wetl<::nds,
requires a ten concurrence from the Division of Envi-
ronmental Management. .
2. Proposed .. ii 11. or substantial modlilcatl0n of equal ?e or
less- .than one-third of an acre of such .raters, incl;.1.di ng
wetlands, does-not require written concurrence from the
Division o" Environmental Management.
3. Proposed fill. of greater than one acre in SA, trout,
HQI,,,I, ORWI, -WS-I and WS-1-I watersheds requires public
notice and an individual 401 Certification from the Di v i -
sion o Environmental Management,
?. That established sediment and erosion control aract.ces
are utilized to preve: t violations of the appropriate
turbidity water quality standard (50 NT-Us in streams and
rivers not designated as trout waters by DEM,/- 25 NTiJs in
all salt ater classes, and all lakes and reservoirs, 10
NTus in z.rout raters);
That additional site-speci i.c conditions may be added to
projects:ith greater than one-third o an acre imup-ct
which are proposed under this Certification in order- to
ensure compliance with all applicable %.,ater quality and
ef_luent standards;
Concurrence frorn DEH this Certi::ication applies to an
individual prefect shall exoi re three years from 4-_- dale

' GENERAL CERTIFICATION FOR PROJECTS ELIGIBLE
FOR CORPS OF ENGINEERS NATIONWIDE PERMIT NUMBER 14 (RO"-:,
CROSSINGS)
' This General Certification is issued in conformity with Z:.he
requirements of Section 401, Public Laws 92-500 and 95-217 w. the
' United States and subject to the North Carolina Division of Envi-
ronmental Management Regulations in 15A NCAC 2H, Section .0500
and 15A NCAC 2B .0109 and .0201 for the discharge of fill mal.=-
' rial to waters and wetland areas as described in 33 CFR 330
Appendix A (B) (14) of the Corps of Engineers regulations (i.?.,
Nationwide Permit No. 14) The category of activities shall
include any fill activity for road crossing and is limited tc.
' fill less than one-third of an acre. This Certification rep'.aces
Water Quality Certification Number 2177 issued on November 5;
1987 and Water Quality Certification Number 2666 issued on Janu-
ary 21, 1992.
The State of North Carolina certifies that the specified
category of activity will not violate Sections 301, 302, 303, 306
and 307 of the Public Laws 92-500 and 95-217 if conducted in
accordance with the conditions hereinafter set forth.
' Conditions of Certification:
1. Proposed fill or substantial modification of water cr
wetlands under this General Certification requires writ-
ten concurrence from the Division of Environmental Man-
agement unless impacts of the project are a) restricted
to waters only (no wetland impact) and b) the project is
subject to and has achieved compliance with the State
Environmantal Policy Act (SEPA) or the National
' Environmental Policy Act (NEPA).
2. If written concurrence is not issued by the Division of
Environmental Management within 45 days from receipT of a
complete application by the Division's 401 Certifica*;=ion
Office in Raleigh, then 401 Certification is deemed to be
issued as long as the applicant follows all other
' conditions of this General Certification unless
additional information is requested in writing by the
Director or his designee;
3. The width of the fill is limited to the minimum nee,?"ed
for the actual crossing;
4. That the roadway width shall be minimized as much as
practicable and that no practicable alternative exits;
5. That established sediment and erosion control pract_ces
are utilized to prevent violations of the appropriate
turbidity water quality standard (50 NTUs in streams and
1 rivers not designated as trout waters by DEM; 25 NTUs in
all saltwater classes, and all lakes and reservoirs: and
10 NTUs in trout waters);
' 6. Measures shall be taken to prevent live or fresh cc:ncrete
from coming into contact with waters of the state -._:ntil
the concrete has hardened;
' 7. That additional site-specific conditions may be ad:.'---.d to

L9 (9 G9U
DEPARTMENT OF THE ARMY
WILMINGTON DISTRICT, CORPS OF ENGINEERS A 2 :jy3
P.O. BOX 1890
WILMINGTON, NORTH CAROLINA 28402-1890 J
IN REPLY REFER TO July 22, 1993
t Regulatory Branch
' Action ID. 199301842 and Nationwide Permit Numbers 14 (Road Crossing)
and 26 (Headwaters and Isolated Waters)
Mr. Kevin Martin
1 Soil and Environmental Consultants, Inc. JUL 2 s. 93
3818 Bland Road
Raleigh, North Carolina 27609
Dear Mr. Martin:
' Reference your application of February 23, 1993, submitted on behalf of
Tri Properties Inc., for Department of the Army authorization to discharge
fill material within waters of the United States, causing the loss of a total
' of 0.475 acres of wetlands and waters (0.175 for bank-to-bank road crossings
and 0.30 for buildings, parking, etc.) adjacent to, and above the headwaters
of, an unnamed tributary to Stirrup Iron Creek, for construction of one
' temporary road, one permanent road, and commercial development for the first
phase of development at the Imperial Center Property, east of NC 54 and south
of Page Road, southeast of Durham, Durham County, North Carolina. Your
' application indicates that application for additional jurisdictional impacts
will be made when development plans are completed.
For the purposes of the Corps of Engineers' Regulatory Program, Title 33,
Code of Federal Regulations (CFR), Part 330.6, published in the Federal
Register on November 22, 1991, lists nationwide permits. Authorization was
provided, pursuant to Section 404 of the Clean Water Act, for discharges of
' dredged or fill material into headwaters and isolated waters provided:
a. the discharge does not cause the loss of more than 10 acres of waters
' of the United States;
b. the permittee notifies the District Engineer if the discharge would
cause the loss of waters of the United States greater than one acre in
' accordance with the "Notification" general condition. For discharges in
special aquatic sites, including wetlands, the notification must also include
a delineation of affected specific aquatic sites, including wetlands; and
c. the discharge, including all attendant features, both temporary and
permanent, is part of a single and complete project.
' Authorization, pursuant to Section 10 of the Rivers and Harbors Act of 1899
and Section 404 of the Clean Water Act, was also provided for fills for roads
crossing waters of the United States (including wetlands and other special
aquatic sites) provided:

fl

I I

-2-
a. The width of the fill is limited to the minimum necessary for the
actual crossing;
b. The fill placed in waters of the United States is limited to a filled
area of no more than one-third acre. Furthermore, no more than a total of 200
linear feet of the fill for the roadway can occur in special aquatic sites,
including wetlands;
C. The crossing is culverted, bridged or otherwise designed to prevent
the restriction of, and to withstand, expected highflows and the movement of
aquatic organisms;
d. The crossing, including all attendant features, both temporary and
permanent, is part of a single and complete project for crossing of a water of
the United States; and
e. For fills in special aquatic sites, including wetlands, the permittee
notifies the District Engineer in accordance with the "Notification" general
condition.
Your work is authorized by this nationwide permit provided it is
accomplished in strict accordance with the enclosed conditions and provided
you receive a Section 401 water quality certification from the North Carolina
Division of Environmental Management. This nationwide permit does not relieve
you of the responsibility to obtain other required State or local approval.
This verification will be valid for two years from the date of this letter
' unless the nationwide authorization is modified, reissued or revoked. Also,
this verification will remain valid for the two years if, during that period,
the nationwide permit authorization is reissued without modification or the
activity complies with any subsequent modification of the nationwide permit
authorization. If during the two years, the nationwide permit authorization
expires or is suspended or revoked, or is modified, such that the activity
would no longer comply with the terms and conditions of the nationwide permit,
activities which have commenced (i.e., are under construction) or are under
contract to commence in reliance upon the nationwide permit will remain
authorized provided the activity is completed within twelve months of the date
' of the nationwide permit's expiration, modification or revocation, unless
discretionary authority has been exercised on a case-by-case base to modify,
suspend or revoke the authorization.

-3-
Please note that this authorization is valid for the work described above
only, and impacts of subsequent projects on this property would have to be
considered cumulatively with these impacts, regardless of future subdivision
or ownership of the property. Questions or comments may be addressed to Mr.
Eric Alsmeyer, Raleigh Regulatory Field office, at telephone [phone],
extension 23.
Sincerely,
4
te Wri
hief, Regulatory Branch
Enclosure
Copy Furnished (without enclosure):
Mr. John Dorney
Water Quality Section
Division of Environmental Management
North Carolina Department of
Environment, Health and
Natural Resources
Post Office Box 27687
Raleigh, North Carolina 27611-7687

' GENERAL CONDITIONS
' 1. Navigation. No activity may cause more than a minimal adverse effect on
navigation.
2. Proper Maintenance. Any structure or fill authorized shall be properly
maintained, including maintenance to ensure public safety.
i 3. Erosion and Siltation Controls. Appropriate erosion and siltation
controls must be used and maintained in effective operating condition during
construction, and all exposed soil and other fills must be permanently
stabilized at the earliest practicable date.
4. Aquatic Life Movements. No activity may substantially disrupt the
' movement of those species of aquatic life indigenous to the waterbody,
including those species which normally migrate through the area, unless the
activity's primary purpose is to impound water.
5. Equipment. Heavy equipment working in wetlands must be placed on mats or
other measures must be taken to minimize soil disturbance.
6. Regional and Case-by-case Conditions. The activity must comply with any
regional conditions which may have been added by the Division Engineer and any
case specific conditions added by the Corps.
7. Wild and Scenic Rivers. No activity may occur in a component of the
National Wild and Scenic River System; or in a river officially designated by
' Congress as a "study river" for possible inclusion in the system, while the
river is in an official study status. Information on Wild and Scenic Rivers
may be obtained from the National Park Service and the U.S. Forest Service.
8. Tribal Rights. No activity or its operation may impair reserved tribal
rights, including, but not limited to, reserved water rights and treaty
fishing and hunting rights.
9. Water Quality Certification. In certain states, an individual state
water quality certification must be obtained or waived.
' 10. Coastal Zone Management. In certain states, an individual state coastal
zone management consistency concurrence must be obtained or waived.
' 11. Endangered Species. No activity is authorized under any NWP which is
likely to jeopardize the continued existence of a threatened or endangered
species or a species proposed for such designation, as identified under the
' Federal Endangered Species Act, or which is likely to destroy or adversely
modify the critical habitat of such species. Non-Federal permittees shall
notify the District Engineer if any listed species or critical habitat might
' be affected or is in the vicinity of the project and shall not begin work on
the activity until notified by the District Engineer that the requirements of
CL7-GCWN

-2-
the Endangered Species Act have been satisfied and that the activity is
authorized. Information on the location of threatened and endangered species
can be obtained from the U.S. Fish and Wildlife Service and National Marine
Fisheries Service.
12. Historic Properties. No activity which may affect Historic Properties
listed, or eligible for listing, in the National Register of Historic Places
is authorized, until the District Engineer has complied with the provisions of
33 CFR 325, Appendix C. The prospective permittee must notify the District
Engineer if the authorized activity may affect any historic properties listed,
determined to be eligible, or which the prospective permittee has reason to
believe may be eligible for listing on the National Register of Historic
Places, and shall not begin the activity until notified by the District
Engineer that the requirements of the National Historic Preservation Act have
been satisfied and that the activity is authorized. Information on the
location and existence of historic resources can be obtained from the State
Historic Preservation Office and the National Register of Historic Places (see
33 CFR 330.4(8)).
' 13. Notification.
a. Where required by the terms of the NWP, the prospective permittee must
' notify the District Engineer as early as possible and shall not begin the
activity:
(1) until notified by the District Engineer that the activity may
proceed under the NWP with any special conditions imposed by the District or
Division Engineer; or
' (2) if notified by the District dr Division Engineer that an
individual permit is required; or
' (3) Unless 30 days have passed from the District Engineer's receipt
of the notification and the prospective permittee has not received notice from
the District or Division Engineer. Subsequently, the permittee's right to
' proceed under the NWP may be modified, suspended or revoked only in accordance
with the procedure set forth in 33 CFR 330.5(d)(2).
b. The notification must be in writing and include the following
' information and any required fees:
(1) Name, address and telephone number of the prospective permittee;
(2) Location of the proposed project;
' (3) Brief description of the proposed project; the project's purpose;
direct and indirect adverse environmental effects the project would cause; any

-3-
other NWP(s), regional general permit(s) or individual permit(s) used or
intended to be used to authorize any part of the proposed project or related
activity;
(4) Where required by the terms of the NWP, a delineation of affected
special aquatic sites, including wetlands; and
(5) A statement that the prospective permittee has contacted;
' (a) The USF'VS/NMFS regarding the presence of any Federally listed
(or proposed for listing) endangered or threatened species or critical habitat
in the permit area that may be affected by the proposed project; and any
' available information provided by those agencies. (The prospective permittee
may contact Corps District Offices for USFWS/NMFS agency contacts and list of
critical habitat.)
(b) The SHPO regarding the presence of any historic properties in
the permit area that may be affected by the proposed project; and the
available information, if any provided by that agency.
14. Water Supply Intakes. No discharge of dredged or fill material may occur
in the proximity of a public water supply intake except where the discharge is
repair of the public water supply intake structures or adjacent bank
stabilization.
' 15. Shellfish Production. No discharge of dredged or fill material may occur
in areas of concentrated shellfish production, unless the discharge is
directly related to a shellfish harvest activity authorized by nationwide
permit.
' 16. Suitable Material. No discharge of dredged or fill material may consist
of unsuitable material (e.g., trash, debris, car bodies, etc.) and material
' discharged must be free from toxic pollutants in toxic amounts.
17. Mitigation. Discharges of dredged or fill material into waters of the
United States must be minimized or avoided to the maximum extent practicable
at the project site (i.e., on-site), unless the District Engineer has approved
a compensation mitigation plan for the specific regulated activity.
' 18. Spawning Areas. Discharges in spawning areas during spawning seasons
must be avoided to the maximum extent practicable.
' 19. Obstructions of High Flows. To the maximum extent practicable,
discharges must not permanently restrict or impede the passage of normal or
expected high flows or cause the relocation of the water (unless the primary
purpose of the fill is to impound waters).
P

20. Adverse Impacts from Impoundments. If the discharge creates an
impoundment of water, adverse impacts on the aquatic system caused by the
accelerated passage of water and/or the restriction of its flow shall be
minimized to the maximum extent practicable.
21. Waterfowl Breeding Areas. Discharges into breeding areas for migratory
waterfowl must be avoided to the maximum extent practicable.
22. Removal of Temporary Fills. Any temporary fills must be removed in their
entirety and the affected areas returned to their preexisting elevation.

INFORMATION
a. All crossings must be from high ground to high ground.

n
I I

b. Bridging will be required in areas designated as anadromous fish spawning
areas by the North Carolina Division of Marine Fisheries (NCDMF) or the North
Carolina Wildlife Resources Commission (NCWRC) if the District Engineer (DE)
determines that use of culverts would likely preclude the continued use of the
upstream waters as spawning areas for the anadromous fish.
NATIONWIDE CONDITIONS
a. The width of the fill is limited to the minimum necessary for the actual
crossing.
b. The fill placed in waters of the U.S. is limited to a filled area of no
more than 1/3 acre.
c. No more than a total of 200 linear feet of the fill for the roadway can
occur in special aquatic sites, including wetlands.
d. Crossing is culverted, bridged or otherwise designed to prevent the
restriction of, and to withstand, expected high flows and tidal flows and the
movement of aquatic organisms.
e. The crossing, including all attendant features, both temporary and
permanent, is part of a single and complete project for crossing of a water of
the U.S.
f. Fills in special aquatic sites, including wetlands, require a 30-day
notification to the District Engineer (DE). The notification must include a
delineation.of affected special aquatic sites, including wetlands.
g. Where local circumstances indicate the need, the District Engineer (DE)
will define the term "expected high flows" for the purpose of establishing
applicability of this nationwide permit.
STATE CONSISTENCY CONDITIONS
a. If the proposed activity is within the North Carolina Coastal Area, the
applicant must receive written concurrence from the North Carolina Division of
Coastal Management (NCDCM) that the activity is consistent with the North
Carolina Coastal Management Program.
b. All fill material authorized by this permit must be obtained from an upland
source.
c. Under this permit, bridging is required in areas designated as anadromous
fish spawning areas by the North Carolina Division of Marine Fisheries (NCDMF)
or the North Carolina Wildlife Resources Commission (NCWRC) in order to allow
CL7-14

-2-
the continued use of upstream waters for spawning. Use of culverts in these
situations is not authorized under this permit.
' d. Should all or part of a proposed activity be located within an Area of
Environmental Concern (AEC) as designated by the North Carolina Coastal
Resources Commission (NCDCM), a Coastal Area Management Act (CAMA) permit is
required from the North Carolina Division of Coastal Management (NCDCM). Should
an activity within or potentially affecting an AEC be proposed by a Federal
agency, a consistency determination pursuant to 15 CFR 930 must be provided to
the NCDCM at least 90 days before the onset of the proposed activity.
GENERAL CERTIFICATION CONDITIONS
a. Proposed fill or substantial modification under this General Certification
requires written concurrence from the North Carolina Division of Environmental
' Management (NCDEM).
b. If written concurrence is not issued by the North Carolina Division of
Environmental Management (NCDEM) within 45 days from receipt of a complete
' application by the Division's Section 401 Certification Office in Raleigh, then
Section 401 Certification is waived for this Nationwide Permit unless additional
information is requested in writing by the Director.
' c. The width of the fill is limited to the minimum needed for the actual
crossing.
d. The roadway width shall be minimized as much as practicable and that no
' practicable alternative exists.
e. Established sediment and erosion control practices will be utilized to
prevent violations of the appropriate turbidity water quality standard (50 NTU's
in streams and rivers not designated as trout waters by the North Carolina
Division of Environmental Management (NCDEM), 25 NTU's in all saltwater classes
and all lakes and reservoirs and 10 NTU's in trout waters).
' f. Measures shall be taken to prevent live or fresh concrete from coming into
contact with waters of the State until the concrete has hardened.
g. Additional site-specific conditions maybe added to this Certification in
' order to ensure compliance with all applicable water quality and effluent
standards.
h. Concurrence from the North Carolina Division of Environmental Management
(NCDEM) that this Certification applies to an individual project shall expire
three years from the date of the cover letter from the NCDEM.

JZ.7?-
!?

r

n
Dear Messrs. Alsmeyer and Dorney:
¦ [phone] ¦
-66T
TD L
GMP
The purpose of this letter is to request Nationwide Permits 14 and
26, and a Section 401 Water Quality Certification for the project
to be known as the Imperial Center Property, in Durham County,
North Carolina. Mr. Alsmeyer of the Corps has previously approved
our wetland delineations. The project was also previously
discussed with Ron Ferrel of DEM. The attached blueprint shows
wetlands proposed "fill" sites for roads, buildings, parking,
etc., and areas of Waters of the U.S. to be impacted at each fill
site. Please note that shaded buildings on the blueprint are
properties that are already developed and are owned by others.
Nationwide Permits 14 and 26 were previously obtained for part of
the project to allow access to the project site. The previously
permitted fill under Nationwide Permit 26 (Area 6A on map) was
' .315 acres above headwaters. An additional .089 acres was
impacted utilizing Nationwide Permit 14 for a road crossing as
shown on the attached plan (Area 10A).
' For the final, stage of the project, it will be necessary to impact
.10 acres utilizing Nationwide 14 (part of wetland 8), and 4.41
acres utilizing Nationwide 26 (wetland areas 1, part of 2, part of
' 3, part of 4, part of 6, most of 9, most of 10, 11, 12, 13, 15,
16, part of 17, part of 19, 20, 21, 22, 23, 24). Wetland areas
receiving no impacts whatsoever are 5, 7, 14, and 18. An
' additional .64 acres (parts of wetlands areas 2, 3 and 4) will be
flooded for the creation of a stormwater retention pond, which
will help protect the watershed. Based on current Corps and DEM
' 11policy," non-vegetated areas of Waters of the U.S. to be
inundated for the creation of lakes or other impoundments are not
considered adversely impacted, except for the dam area, so the .64
acres to be inundated are not included as total wetland impacts.
See attached site photos and DEM wetland rating forms for

Soil & Environmental Consultants, Inc.
Soil/Site Evaluation ¦ Mapping and Physical Analysis ¦ Wetlands Mapping and Mitigation ¦ Environmental Audits
On-5:- Waste Treatment Systems, Evaluation and Design
U.S. Army Corps of Engineers NCDEHNR-DEM
Raleigh Field Office, Regulatory Branch Attn: Mr. Ron Ferrel
Attn: Mr. Eric Alsmeyer PO Box 29535
6512 Falls of the Neuse Road, Suite 105 Raleigh, NC 27626
Raleigh, NC 27615-6846

' information about individual wetland areas. Note that not all
wetlands on-site are represented by a site photo or rating form,
' but those that do are fairly representative of what is found on-
site. Wetlands on the map that are hand labeled are not to be
impacted, but are identified for the purpose of matching up to
site photos or rating forms. Wetlands 3, 6, 9, 11, 13, 15, 18,
and 24 are primarily dry channels. Wetlands 1, 4, 8 and 20-22 are
streams without much adjacent development. Wetlands 7, 12, 14,
' 17, and 19 are channels with a fair amount of rip-rap, or are iri
rather developed areas. Wetland 2 is partially rip-rapped, and
partially a nicely wooded stream. It will be partly flooded for
the stormwater retention pond, but the rest will not be impacted.
Wetland 5 is partially rip-rapped, but then broadens and becomes a
valuable bottomland hardwood which will not be impacted. Wetland
10 is probably the highest value wetland to be impacted in terms
' of habitat, as it contains many large, old trees (it did not rank
highly in bank stabilization, so its overall value is not the
greatest). Wetland 23 appears to have been impacted somewhat
' already from DOT road construction, but the entire wetland is
included in this permit application as an impacted area.
When completed, the retention pond will be approximately
' acres. Note that the pond will be built in stages (see attached
report from Envirotek). The pond has been over-designed to be
able to collect more stormwater than is actually needed for the
remaining area to be developed within the primary watershed basin
on-site; it is large enough to also accommodate runoff from parts
of the project being developed that are outside the primary
' watershed even though they will not drain into the pond. Although
it will not be actually collecting run-off from these areas, the
pond will collect run-off from areas previously developed on the
Imperial Center site, which were built without a retention pond.
The over-design of the pond will partially compensate for the lack
of retention pond in areas that have already been developed on the
Imperial Center site. Some of the areas already drain to an
' offsite pond, others are too close to the property boundary to
allow for placement of basins. The completed pond will have a
shallow rim at least 10 feet wide, ranging up to 25 feet wide.
Part of the rim will be planted with wetland vegetation; the rest
will be allowed to vegetate naturally.
We have worked with the developer and architect (Envirotek)
' extensively to minimize total impacts especially to high value
areas. The main stream channel that disects the site will have no
new impacts to it except for the retention pond. A vegetated
' buffer will be maintained along the major creek which traverses
the project site in areas that are not already developed and the
retention pond will also help maintain water quality.
C

' Approximately 1.13 acres of vegetated wetland will be created
along the pond margin which will partially offset impacts. This
acreage is a rough calculation made from exhibit number 3 in the
attached Envirotek report.
Please contact me if you have questions or require additional
' information. We appreciate your willingness to work with us
toward the economical and timely completion of this project. If
you plan to visit the site, please let us know, so we can arrange
for someone to accompany you.
' Sincerely,
' Kevin C. Martin,
President
Enclosure
cc: David Franklin, U.S. Army Corps of Engineers
Karl Shafer, DEM
N.C. Cultural Resources
U.S. Fish and Wildlife Service
National Marine Fisheries Services
David Lasley, Envirotek
KM/jb

10/06/1997 08:52 9198469467PAGE 02
t l' I ? ! 1
1
sail & Environmental Const ltants, Inc.
3818 131and Road ¦ Raleigh, North Carolina 27609 ¦ (919) 7949117 ¦ Fax [phone]
November 22, 1933
U ,f3. Army corps of Engineers
R..o.c.igh Field office, Regulatory Branch
At: n: Mr. Eric Alsmeyer
ci,:>1.2 Falls of the Neuse Road, Suite 105
Raleigh, NC 2763.5-6846
i)car Mr. Alsmeyer:
' 1'l,r, purpose of this letter is to request a modification to our
loc_t..ober. 14, 1993 application for Nationwide Permits 14 and 26 for
t.-.ho Imperial Centex Property, in Durham County, North Carolina.

Undor, the modification, the area labled wetland 10 will not be
:impacted, aside from the area previously permitted under
Nationwide Permit 14 for a road crossing. We are eliminating the,
to wetland 10 so that the remainder of the of the
X71{p1 i.c ati.on can be processed and approved. We are not requesting
modification to our 401 application for the time being, for
roar;ons discussed below.
modification will reduce the area to be impacted under NW 26
by 1.53 acres, reducing the area of total impact from 4.41 acres
t:c::, 1.88 acres. The area to be impacted under NW 14 will remain
the same, at 0.10 acres. From a water quality standpoint, we are
not currently proposing a revision in the pond's size; it will.
,:;till be, sized as if this area were being developed.
note that we may have to submit another Nationwide Permit
tipp..l..i.cation, since we are not certain as of yet whether the plans
ciin bo modified enough to completely avoid wetland 10. Envirotek
j:-, ,a l f;o in the process of trying to redesign the project to Fee if
wc-t-l and impacts can be minimized any further. We have chosen this
upt,i.on, even though we feel impacts have been minimized and
<1vo.idr d, so we can rethink the layout, determine if impacts can be
??°o.i r.lrc3 and./or minimized further to wetland 10, prepare more
if•ttOled justifications for the impacts, or a do combination of.`
clarions.
c:.ontact me if you have questions or require additional.
Oitormation. We will inform you whether or not another_
;11)1) 1 i (-,at. i on will be forthcoming as soon as the plan mod if icationo,
?(rlr 1:v,,lrr.?ti,ui r P,1.ihl,inh and Physical Analvsis r Wetlands Maplsing and N,litigation r 1•.nvirowl"i•nt,1I ,N1101t,,
I I
011-Sile Waste Trc-mr;wtif `,vtilrrr, r v,iht itirw .rrn•1 T1,•.,?,•,.
10/06/1997 08:52 9198469467
;;nd/or review are complete.
' i ncer.ely,
Kevin C. Martin,
President
i
?''` PAGE 03
' 1@/06/1997 08:52 9198469467 PAGE 15
' DEPARTMENT OF THE ARMY
, Q
` ?. WILMINGTON OtSTR1I:;T, CORPS OF ENGINEERS DEC
PO. BOX 1890
WILMINGTON, NORTH CAROLINA 284021890
13ecember 3, 1993
' IN nc11tY• BE Ktk To
A('t I(Ill 11), 399301842 and Nationwide Permit Numbers 14 (Road Crossing) and 26
(I1.?uciwat-erti and isolated Waters)
tri 1'f'C.pert'ies, Inc.
Kevin Martin
!;(,ii. and Environmental Consultants, Inc.
3816 Bland Road
' 1?gal r.ic;h, North Carolina 27609
1), ;)7' Mv, Maa:'Lin:
)2ofcrence our letter dated July 22, 1993, confirming nationwide gencral
p-linit.. authorization of Tri Properties, xnc,'s proposed discharge of fill.
w,o,.•t:i.nl. within waters of the United States, impacting a total of 0.475 ac2:e.
,t wr,t-land., and wagers (0.175 for batik-to-bank road crossing:, and 0.30 foe.
IIfiirvI:;, parking, etc.), adjacent, and above the headwaters of, an uiin,?med
;b%It--1r:y to Stirrup Iron Cheek, for construction of one temporary road, once
road, and commercial development for the first please of the T)n1>cr2 ,.)1
„t (-i ilropc=rt.y, cast of N.C. 54 and south of Page Road, sout:heaal: of Du)-hafii,
iiii, ?i.ini cot),Tty, North Carolina. Reference also your application of Octohc: 2,91
for Department of the Army authorization for additional. impacts i..()
wot ,!t r; ot; tile. United Statez, for the final (stage of the project, and your
1"I'Ar;7' dated November 22, 1993, revising the application to delete addit-ional
Co "Wotland 10," for total additional impacts to 2.98 acres (0.1 1.07`
c:rosring . and 2.88 for build ings/parking/stormwater retention).
1:'ur Lhe purpose, of the U.S. Army Corps of Engineers' Regulatory 1?r0r3r.'am,
1'i t. 1 c 33, Code of Federal Regulations (CFR), Part 330.6, published in 1-110
1'? cis: 2 al Rcgi.: ter on November 22, 1991, lists nationwide permits (14WV) .
i\iq h,.7), i zation was provided, pursuant to Section 404 of the clean Water
Act- c,). discharges of dredged or fill material into headwaters and isciaLed w'«t:c7T'c%
rov i.d(-.d
,), 'rile discharge does not cause the loss of more than 10 acre:, of w:zt?r
oI t1)r. United States;
1). '1'h<, ISermittee notifies the District Engineer if the discharge would
t):;,. t.hc ] os-; of waL-ez's of the United States greater than one acre j.n

10/06/1997 08:52

9198469467
-2-
PAGE 16
+,? cl.ttt, et w.i.th the "Notification" general condition. For discharges ill
.inc;lu<ic
must al:.;()
l„ , i.tl tc.;u;?lic mites, including wetlands, the notification
af,fectcd epecifie aquatic cites, including wctlar,de.:; rlcl
c:. Cl?c discharge, including all attendant features, both temporary an(l
rW7.iY0IIc.;ttt, is part of a single and complete project.
AIltlaor:ization, pursuant to Section 10 of the Rivers and Harbors Act of :L899
rtltc.9 f;,ac?t: ion 404 of the Clean Water Act, was also provided for fills for roads
t a. 1 n,f waters of the United States (including wetlands and other especial
r,i;u:.tti r. ,,jt;e:,) provided:
.'A, 7'he width of the fill is limited to the minimum necessary for the
ac•t.l.hl t c!tosui.ctg;
1,. rile f: ill placed in waters of the United States is limited tO a f i I I.cd
?cn ..,f tic) more than 1/3 acre. Furthermore, no more than a total. of 200
l ine--tr feet, of the fill for the roadway can occur in special aquatic
i ,,,.• l uO i nq we- t-.1 ands ;
1'l,c crossing is eulverted, bridged or ott'<erwise de:,igned to prevent.
of, and to withstand, expected highflows and the tnovcInc111. Of
;Irl,ult. t c• oz•gatst?m.?;
Crossing, including all attendant features, both tempay.ary and
r, t.ut•?ttertt, iti part of a single and complete project for cro3sing of a warc,r of
t.)t,` united States; and
c. Pox fills in special aquatic sites, including wetlands, the pe.r-rnittce.
tho District Engineer in accordance with the "Notification" gcncr_il
c•?rtd:i l i.on .
Yc,,ur, r o.vi.sed project, impacting a total of 3 , 4,55 acres (3.16 vndc.>.-
Nt•7l' No, ?.c) is authorized by these NWPs provided it is accomp3.islied in s ltric.t:
witlt the enclosed conditions and provided you receive a Section 401.
w•tt.c,.7 qua3.ity certification from the North Carolina Division of Envirorim,"ntal
r l•.t,tr,,, ft ,nc r, t:. You should contact- Mr. John Dorney, telephone [phone]'106,
t , --1rd i.nc-f water quality certification. 't'hese NWPs do not relieve you of t.Itc
to obtain other required State or local approvals.
vrrif.i.cati.on will be valid for 2 years from the date of this; litter:
t:l,t.- ,7at:.ionwide authorization is; modified, reissued or revoked.
t I,i:; vcrff.icat iron will remain valid for the 2 years if, dur.inc3 that

' 10/06/1997 08:52 9198469467 PAGE 17
a
t It- NW{' .tit Lho.t".tzati0t? is reissued without modification or the activity
tn(?.l.ic?;. with ?,iny subsequent modification of the N'WP authorization. Tf, duri.n,i
t t, , yr,;irsi, t.}te NWP authorization expires or is suspended or revoked, or: i
-,ur:h t:h*t: the activity would no longer comply with the teams and
t,ri i t. i on, of ti.hc NWP, activities which have commenced (i . e . , are under
1.0rt:;t:t:uction) or are under contract to commence in reliance upon the NWI' will
t ' t,ti;:r .n authorized provided the activity is completed within. 12 months of, Lhe
ri.,l_e_' of the Nwk,I s expiration, modification or revocation, unless discretionary
otrt-linri.ty has been exercised on a case-by-case base to modify, suspend or
i-evok.r., the authorization..
131c-a.e note that this authorization is valid for the work described above
' )10y" atsd imparts of subsequent projects on this property would have to be
c,,tt:;jdcrcd cumulatively with these impacts, regardless of future subdi.vi :i.on
t.,t- owner ;hap of the property. Questions or comments may be addrer3 sed t.o
tel.cl?l?cn<>
Mt 1tl.::mcyer of my Raleigh Field Office regulatory staff-, at
t.i'16-13441 , extension 23.
sincerely,
ne Wri
Chie Regulatory Branch
011>y Vurnickicd (without enclosure) :
11-It . Jotwt Dorney
Water Quality Section
Vivi, ion of Environmental Management
p4:trLlt Carolina Department of
Environment, Health and
Not,.ur'ul: Resources
Of.:ficc; Box 29535
t,.t].L.:i.<(2t, Nor.Lh Carolina 27626-0535

¦ ri-Prop & Hotel Corp TEL:[phone]

11
t

t
r
State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Environmental Management
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
December 6, 1993
Tri Properties Inc.
Attn: Henry Massey, Jr.
P.O. Box 19067
Raleigh, N.C. 27619
Project # 93931
Durham County
Dear Mr. Massey:
Dec 09 93 17:11 No.005 P.02
Of ?5; WA
.rriw?
E3 E--= Hf?F
The Division of Environmental Management, Water Quality Section
has reviewed your plans for wetland fill for 4.51 acres of wetlands at
imperial Center Property in Durham County fbr commercial development.
Based on this review, we have identified significant uses which would
be removed by this project. These uses are water storage and
pollutant removal. Furthermore, insufficient evidence is present in
our files to conclude that your project must be built as planned in
wetlands. Therefore, we are moving toward denial of your 401
Certification. Until we receive additional information, we are
requesting (by copy of this letter) that the U.S. Army Corps of
Engineers and/or the N.C. Division of Coastal Management place your
project on administrative hold.
Please provide us with information supporting your position that
your project must be constructed as planned and that you have no
practicable alternative to fill of these wetlands. Specifically can
you construct your development without filling the 2.7 acres on
wetlands #10, 13 & 19? Any documentation such as maps and narrative
which you can supply to address upland alternatives may be helpful in
our review of your 401 Certification. Please respond within two weeks
of the date of this letter by sending a dopy of this -information to me
and one copy to our Mr.-Karl Schaffer at the Raleigh Regional Office
at. 3800 Barrett Drive,. Raleigh,'N:C. 27609.
Sincerely,
Jo n R. rney
We lands and Techn cal Preview Group
93931.na
cc: Raleigh DEM Regional Office
Wilmington Office Corps of Engineers
Central Files
Eric Alsmeyer, COIF Raleigh Field Office
Kevin Martin; Soil and Environmental Consultants
P.O. Box 29535, Rdelgh, North Carolina 27626-0535 , Telephone [phone] FAX [phone]
An Equd Opportunity Aftkmative Action Employer . 50% recycled/ 10% post-consxner paper

Soil & Environmental Consultants, Inc.
i ¦ Raleigh, North Carolina 27609 ¦ (919) F90-9117-0 Fax (9+9) 90=1728
OUR NEW ADDRESS:
' 244 West Millbrook Rd
Raleigh, NC 27609
Ph. 919-846-5900 Fax [phone] December 9, 1993 .?6E4 q3
NRCD - DEM DEC 2 2
Attn: Mr. John Dorney
' PO Box 29535
Raleigh, NC 27626
Dear Mr. Dorney:
The purpose of this letter is to request a modification to our
October 14, 1993 application for Section 401 certification for the
Imperial Center Property, in Durham County, North Carolina.
Under the modification, the area labeled wetland 10 will not be
' impacted, aside from the area previously permitted under
Nationwide Permit 14 for a road crossing. We are eliminating the
impacts to wetland 10 so that the remainder of the application can
be processed and approved.
This modification will reduce the area to be impacted under NW 26
by 1.53 acres, reducing the area of total impact from 4.41 acres
to 2.88 acres. The area to be impacted under NW 14 will remain
the same at 0.10 acres. From a water quality standpoint, we are
not currently proposing a revision in the pond's size; it will
still be sized as if this area were being developed.
Please note that we may have to submit another permit application,
since we are not certain as of yet whether the plans can be
modified enough to completely avoid wetland 10. Envirotek is also
in the process of trying to redesign the project to see if wetland
impacts can be minimized any further. We have chosen this option,
even though we feel impacts have been minimized and avoided, so we
can rethink the layout, determine if impacts can be avoided and/or
minimized further to wetland 10, prepare more detailed
justifications for the impacts, or a do combination of these
options.
Please contact me if you have questions or require additional
information. We will inform you whether or not another
application will be forthcoming as soon as the plan modifications
and/or review are complete. A copy of this letter has already
i
11
I Soil/Site Evaluation ¦ Mapping and Physical Analysis ¦ Wetlands Mapping and Mitigation ¦ Environmental Audits
On-Si- Waste Treatment Systems, Evaluation and Design
r
been sent to the U.S. Army Corps.
Sincerely,
Kevin C. Martin,
President
cc: David Franklin, US Army Corps
Karl Shaffer, DEM
N.C. Cultural Resources
US Fish & Wildlife Service
National Marine Fisheries Service
David Lasley, Envirotek

State of North Carolina IT F
' Department of Environment,
Health and Natural Resources 4 • •
Division of Environmental Management
' James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary E H N F1
A. Preston Howard, Jr., P.E., Director
January 25, 1994
' Tri Properties Inc.
Attn: Harry Massey, Jr.
P.O. Box 19067
Raleigh, N.C. 27619
Dear Mr. Massey:
Subject: Proposed fill in Wetlands or Waters
Imperial Center development
Durham County
DEM Project # 93931
' Upon review of your request for 401 Water Quality Certification to place
fill material in 2.88 acres of wetlands or waters which are tributary to
Stirrup Iron Creek for commericial development located at South of I-40, near
Wake County line in Durham County as described in your submittal dated 14
' October & 9 December 1993, we have determined that the proposed fill can be
covered by General Water Quality Certification Numbers2671 & 2732. Copies of
the General Certifications are attached. These Certifications may be used in
qualifying for coverage under Corps of Engineers' Nationwide Permit Numbers 14
& 26.
Additional conditions are that
1.) final written approval for the stormwater plan must be
obtained from DEM and
2.) the shoreline of the detention pond (shown as "shallow
marsh" in the Envirotek application [5 August 1993])
shall be planted with emergent wetland plant species
' and
3.) wetland area number 10 shall not be filled.
If this Certification is unacceptable to you, you have the right to an
adjudicatory hearing upon written request within thirty (30) days following
receipt of this Certification. This request must be in the form of a written
petition conforming to Chapter 150B of the North Carolina General Statutes and
filed with the Office of Administrative Hearings, P.O. Box 27447, Raleigh,
' N.C. 27611-7447. Unless such demands are made, this Certification shall be
final and binding.
If you have any questions, please contact John Dorney at 919-733-1786.
' Sincerely,
P eston Howard, ?r P.E.
' 93931.1tr NjL'1
Attachment
cc: Wilmington District Corps of Engineers
Corps of Engineers Raleigh Field Office
Raleigh DEM Regional Office
Mr. John Dorney
Central Files
Mary Frazier; Soil and Environmental Consultants
' P.O. Box 29535, Rdeigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post-consumer paper
GENERAL CERTIFICATION FOR PROJECTS ELIGIBLE
FOR CORPS, OF ENGINEERS •NATIONWIDE PERMIT NUMBER 26 (HtADWATERS:
AND 'ISOLATED WETLANDS)
' This . Gdneral Certification i s issued in conformity with the
requirements of ::Section 401' Public `:Laws••.927500 `and 95-217 of the : :
; United ::States ,A'nd •'subj ect to" the .North Carolina .Division of Envi- '
1 ronmental Management, Regulations- in•*15A7NCAC. 2H; Section' :0500 '
:and .15A NCAC 2B . 0109 and- : 0201: for.:the •dis-charge- of -fill mate-
.rial Lo navigable waters and-adjacent wetland areas which are
above the headwaters or to wetland:areas that are. not a part of
the surface tributary system '.to interstate water's or . navigable
waters of the United States (i •. *e . , isolated wetlands) as
' y described in -33 - CFR 330 Appendix A .(B) (-26) of the Corps of Engi-
neers : regulations .(i. e„ Nationwide Permit Vo. 26) . The category
of. activities shall include any..fill activity.in. these head.-Waters
and isolated wetland and water areas where the-activity results
in the loss or :substantial modification of-not more than .10 acres
of waters of the'United States, including wetlands: This
' Certification replaces' Water .Qualit y.Certification Number 2,176
issued on-November 5, 1987.
The State of North Carolina certifies that the specified
category of activity will not -violate 'Sections 301, 302, 303, 306
and 307 of the Public Laws 92-500 and 95-217 if conducted in
accordance *with the conditions hereinafter set forth.
.s
Conditions of Certification:
1. Proposed -fill or substantial modif i ca.tion .of greater than
one-third of an acre of such waters, including wetlands,
requires a written concurrence from the Division of Envi-
ronmental Nanagc::;;lent .
2. Proposed fill oa: substantial modification • of equal to or
less than one-third of an acre of such 4-raters, including
wetlands
does not
i
itt
,
requ
re wr
en concurrence from the
Division of Environmental Management.
?. Proposed fill of greater than one acre in SA, trout

' ,
HQW, ORW, SqS-.I and WS-II watersheds requires public
notice and an individual 401 Certification from the Divi-
sion of Environmental Management;
That established sediment
d
i
an
eros
on control practices
are utilized to prevent violations of the a'DU rooriate
turbidity water quality standard (50 INTUs in_streams and
t rivers not designated as gout waters by DEMI; 25 NTUs -Jr.
all salt?,,ater classes, and all 1 a)_es and reservoirs, 10

'
.. T:TUs i n trout l.,aters, ;
That additional site-specific condition
b
dd
d
e a
e
to
s may
projects with greater than one-third of an acre imoact

' ?,,hich are proposed under this Certification in order to
ensure compliance with all applicable ater
ualit
a
d
q
y
n
e_-,fluent standards;

' 6. Measures shall be taken to prevent li-,;e. or Fresh
concrete from coming into contact. ,)ith %.)aters of the
st-ate until the concrete has harder?ed.
CO?'!::L!! ?:e ??:e on Di? `l, .s Ce..ti.,._.-atlon ap
p Lies ),:e a?!
vi
??d
di!a
l
?rcicct :
a1
r
1
J
t'
=
;
.
.
.
.
:
.
?;
_
..:e
s._:^c Y ea1:s
roc?: t
?e d . ?e

1 ,
.of -the •cover..lett•erfrom DEM.
Non-r-ompliance..-witxi:.-or: vio-lati-on .of the conditions Yierein set..
forth.•by' a specific'. fi.11--project -shall. result in' rev,6cation,-of
this. Certification -f'or:.the project. . ,. '
=The Director of the ,.North Carolina: Division* of Znvi-ronmental
Management may require 1-ubmis'-sion of ' a• formal epp.?i-cation for -
individual certification for-.any-'project in this category of
activity; -if it is determined *that the project is likely to have
a.significant adverse effect upon water quality or degrade the
waters so that existing uses of *the wetland or. downstream waters
are precluded.
Public hearings may be held for specific applications Or'
group pf applications prior to a Certification decision if deemed
in the public's best interest by the Director of the North 'Caro-
l ina Di-vision of Environs ental Management.
This is the 21st day of January, 1992
DIVISION r NVIRONMENTAL MANAGEMENT
By George T. LVvere -t, Director

gencert.26
jrd/gc
'WQCT 2671
GENERAL CERTIFICATION FOR PROJECTS ELIGIBLE
FOR CORPS OF ENGINEERS NATIONWIDE PERMIT NUMBER 14 ;GOAD
CROSSINGS)
. This General Certification is issued in'-conformity with the
requirements of Section 401,.Public Laws 92-500 and 95-217 of the
' United States and subject to the-North Carolina Division of Envi-
ronmental-Management Regulations in 15A NCAC 2H,-Section .0500
and 15A NCAC 2B .0109.and .0201 for the discharge of fill mate-
rial to waters and wetland areas as described in 33 CFR 330.
Appendix ,A ( B ) (14) of the Corps-.of Engineers regulations (i.e.,
Nationwide Permit No. 14).The-category of activities shall
include any fill activity for road crossing and is limited to
fill less than one-third of an acre. This.Certification replaces
Water Quality. Certification Number-2177 issued on Novembe-- 5,
1987 and Water Quality Certification Number 2666 issued on'Janu=
a--.-y 21, 1992.
The State of North Carolina certif ies that the specified
category of activity will not violate Sections 301, 302, 3C3, 306
and 307 of the Public Laws 92-500 and *95-217 if conducted in
accordance with the conditions hereinafter set forth.
Conditions of Certification:
' 1. Proposed fill or substantial modification of
wetlands under this General. Cert fication requires writ-
ten concurrence from the Division of Environmental Man-
agement. Projects which impact waters only do not
require written concurrence.
2. If written concurrence is not issued by the Division of
Environmental Management within 45 days from receipt of a
complete application by ti'r^? Division's 401 Certification
Office in Raleigh, then 401 Certification is deemed. to be
issued as long as the-applicant follows a].1. other
conditions of this General Certification unless
additional information is requested in writing by the
' Director or his designee;
3.. The width of the fill is limited to the minimum needed
for the actual crossing;
' 4. That the roadway width shall be minimized as much as
practicable and that no practicable alternative exists;
5. That established sedime-,t and a-rosion control practices
ai.e utllizeC; to preveniC violations o` the appropriate
Lurbidity ?,.ater quality standard (SO !BTUs in streams and
rivers not designated as trout ;-;titers by DENj - 25 N`:CUs in
all sal,-ater classes, and all lakes and reservoirs; and
10 !? T U s in toLi t watez:s; ;
6. Measures shall. be taker, to prevent live or fresh concrete
' Lr0n) codling into contact e.pith waters or the sta*ce ?_?.ntil
_l1e col1c C--_' -e has hardened;
17) -i,lt eddJ.O:1?.! SJ.u0-S C: 1.1C CC:,11t101s I;la.i% i:ay eLc
?G

Pzvposea uciue? ???LS ?;er?z, zc aLZC?ii in oraer L'o
' ensure compliance with all applicable water quality and
effluent standards;'
8. Concutrence from DEM that this Certification applies to
an-individual
. project. shall expire three years from the,
date. of the cover letter from DEM..
Non-compliance with or violation of the-conditions herein set
forth by a specific fill project shall-result in revocation of
this Certification for the project.
The Director of.. the North Carolina Division of Environmental
Management may reqre submission of a formal application for
' individual certification for any project in this category of
activity, if it is determined that the project is likely to have
a significant adverse effect upon water quality or degrade the
' waters, so that existing uses of the wetland or downstream waters
are precluded.
Public hearings.may be held for specific applications or
group of applications-prior to a Certification decision if deemed
in the public's best interest by the Director of the North Caro-
lina Division of Environmental Management.
This is the 1st day of May, 1992
•
' DIVISION ?NVIR N E
0r O N NT__L MANAGEMENT
_
BY
George T. verett, Director
gencert.14a
' j rd/gc
WQC #2732

0

1 18 July 1994

' State of North Carolina
Division of Environmental Management
Water Quality Planning-Stormwater Section
512 N. Salisbury Street
Raleigh, NC 27626-0535
Attention: Scott Thomas
Envirotek, Inc.
1111 Oberlin Road
Raleigh NC 27605 USA
Telephone: [phone]
Telefax: 919-839-2255
architects engineers planners
Reference: Proposed Fill In Wetlands Or Waters
Imperial Center Development
Durham County
DEM Project #93931
Dear Mr. Thomas:
In keeping with condition number (1) of the approval letter issued by DEHNR - A. Preston
Howard, Jr. P.E. dated 25 January, 1994 attached please find (3) sets of final construction
' drawings along with (3) sets of supportive calculations for the project captioned above for
your review and approval.
' Upon your initial review, we also intend to prepare a detailed landscape plan to meet
requirements listed in condition number (2) of the approval letter.
' Should you have any questions please feel free to contact us. We appreciate your assistance
over the past several months regarding proceeding with this project.
' Sincerely,
Glenn Phillips
1 ICWQPI GMP:eyb
Enclosure
0

15 July 1994
City of Durham Engineering Department
' 101 City Hall Plaza
Durham NC 27701
Attention: Wayne Brogden, P.E.
Envirotek, Inc.
1111 Oberlin Road
Raleigh NC 27605 USA
Telephone: [phone]
Telefax: 919-839-2255
architects engineers planners
Reference: Imperial Center - Water Quality Pond - Phase I
Dear Wayne:
' In keeping with our discussion several months ago regarding our intent to design and
eventually construct Phase I of the pond captioned above, attached please find (2) sets of
plans for your review and approval. We have also sent plans to Durham County since the
pond will parallel their sanitary sewer along its's northerly border.
You will recall we were granted approval by the Army Corps of Engineers and the State's
Water Quality Section to build the pond in exchange for being able to fill several wetland
areas throughout Imperial Center. With the establishment of the City's Stormwater Utility,
' we feel it would be appropriate for the City to review and approve the pond's design as well.
' Upon review, should you have any questions, please feel free to contact me.
Sincerely,
Glenn Philfips
ICWQPI GMP:eyb

I?

15 July 1994
Envirotek, Inc.
1111 Oberlin Road
Raleigh NC 27605 USA
Telephone: [phone]
Telefax: 919-839-2255
architects engineers planners
Durham County Project Management
200 E. Main Street
Durham NC 27701
Attention: Andy Lambeth
Reference: Imperial Center - Water Quality Pond
Dear Andy:
In keeping with our discussion several months ago regarding our intent to design and
eventually construct Phase I of the pond captioned above, attached please find (1) set
of plans for your review and approval.
You will recall Phase I entails construction of the pond alongside the County's existing
sanitary sewer easement. This involves placing fill along the easement and resetting
several manhole lids based upon maintaining a minimum of 1' above the calculated 100
year storm water surface elevation.
Should you have any questions please feel free to contact me
Sincerely,
Glenn Phillips
ICWQPI GMP:eyb
' 10/06/1997 08:52 9198469467

1

F

I I

F

Jurtc 23, 1995
i )`? Army Corps of Engineers
Atin: Mr. Eric Alsmeyer
o!) I')- Falls of the Neu se Rd, Suite 105
R.i oigh, N(` 27615-6846
Dom- Mr. Alsmeyer:
'I'll(, purllosc, of this letter is t,6 request a reauthorization of our client's
NMionwide 26 and 14 Permits for the project known as Imperial Center, Durham
Cotm(N:, North Carolina. The.authorization letter (Action ID #199301812, 1>I;M
1),ol'oc t # 9:W31) %vas originally issued on July 22,1993. Since the verification is
only valid for two years and the client's project has commenced but will not be
c c ilplotod by tl1c, end of July`lwe request a reauthorization. All impacts will bo
tho silmo as descrilled in the current permit (2:88 acres under Natiotitvide 26 arld
0. 10 wilii.ing Nationwide 14) Due to unforeseen delays the project is bohind
s' 11t•dul<•, Our client should be able to comptete the project within the time limit
ill lowod under a now NW 14:..a.nd 26 hermit.
tVo 11,1vo it comproltensive fifo.'containing project plans, wetland locations and
()I expocted impacts. Alf pertinent information has already beer? Ilrovidod
with past permit applications. However, please live us a call if you rocluirC 4111Y
a(i(Iitional information to reauthorize this perniit verification.
`ii 1woroi)',
Kevin IN1artin,
I'l-o"Idelit
CC? I )avid Franklin, Wilmington Office Corps of I ng ers
1olm I orney, DEM
t'' ir, I.?.rlu.uv,n ?tatil>>rtt; and Physical A alysis ¦ Wetlands M Ipin1, and titifit atiorrl It i rn ir?rnun{ nlai ??trilitr
c }t, Sm, W me Treatment Systems, I.,vrt111nticln and Design
PAGE 14
Soil & Environmental Consultants, It.c,
244 West Millbmok Road ¦ Raleigh, Nottli Carolina 2760919(929) 8,16-59001M Fax.
' AUG-02-1994 18:16 TRI PROPERTIES 9199416319 P.02i06
State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Environmental Management
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary F="N F1
A. Preston Howard, Jr., P.E., Director
July 14, 1995
Durham County
' DEM Project # 95683 (93931)
APPROVAL of 401 Water Quality Certification and ADDITIONAL CONDITIONS
' Mr. Harry Massey, Jr.
Tri Properties, Inc.
P. O. Box 19067
Raleigh, N.C. 27619
Dear Mr. Massey:
' You have our reauthorization to place fill- material in s of wetlands or waters for the
purpose of commercial development at your property south of I40 near W, akurham line, as you
described in your application dated 23 June 1995. After reviewing your application, we have decided
that this fill is covered by General Water Quality Certification Numbers 2671 and 2732. These
certifications allow you to use Nationwide Permit Numbers 14 and 26 when they are reissued by the
Corps of Engineers.
This approval is only valid for the purpose and design that you described in your application. If
you change your project, you must notify us and you may be required to send us a new application.
For this approval to be valid] you must follow the conditions listed in the attached certification.
' Additional conditions in our?rianuary 1994 authorization are still applicable. In addition, you should
get any other federal, state or local permits before you go ahead with your project.
If you do not accept any of the conditions of this certification, you may ask for an adjudicatory
hearing. You must act within 60 days of the date that you receive this letter. To ask for a hearing,
send a written petition which conforms to Chapter 150B of the North Carolina General Statutes to the
Office of Administrative Hearings, P.O. Box 27447, Raleigh, N.C. 27611-7447. This certification and
its conditions are final and binding unless you ask for a hearing.
This letter completes the review of the Division of Environmental Management under Section 401
of the Clean Water Act. If you have any questions, please telephone John Domey at 919-733-1786.
Sincerely,
P t n w , Jr.
' Attachment
cc: Wilmington District Corps of Engineers
Corps of Engineers Raleigh Field Office
Raleigh DEM Regional Office ,L6
' Mr. John Domey
Central Files
Kevin Martin; Soil and Environmental Consultants 95683.1tr
' P.O, Box 29535, Raleigh, North Carorina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10%post-consmerpaper
AUG-02-1994 18:16 TRI PROPERTIES 9199416319 P.03i06

t

GENERAL CERTIFICATION FOR PROJECTS ELIGIBLE
s of ENGINEERS NATIONWIDE PERMIT NUMBER 26 (HtADWATERS
This General Certification is issued in confo,mit with the
r•ecuirements• of Section 401,. Public Laws 92-500 and 95-217 of the
United States and subject to the North Carolina Division of Envi-
ronmental Management Regulations in 15A NCAC 2H, Sect: on .0500
and 15A NCAC 2B .0109 and .0201 for the discharge. of fill mate-
rial to navigable waters and adjacent wetland areas Vnich are
above the headwaters or -to wetland areas that are not a part of
the surface tributary systiem to interstate waters or navigable
waters of the United States (i.(i ., isolated wetlands) as
described in 33 CF? 330 Appendix A •(B) (26) of the Cops of Engi-
neers • regulations (i. e. , Nati or.wide Permit No . 2 6) . The category
of activities shall include any fill activity in. these headwaters
and isolated wetland and water areas where the activty results
in the loss or substantial modification o= not more than 10 acres
of waters or'_ the United states, including wetlands. This
Certification replaces Water Quality Certification Number 2176
issued on-Novenber 5, 1987.
The State Of Forth Carolina certifies that the S-' Glfied
category of activity will not violate Sections 301, _02, 303, 306
and 307 o4 the Public Laws 92-500 and 95-217 if conducted in
accordance with the conditions hereinafter set. fo-nth.
Conditions of Cer -if J.cat iQn ;
i. Proposed fill or substantial modi.fication-of greater than
one-third of an acre of such waters, including wetlands,
requires a written concurrence fr6m the Di vi ;ion of Env-;..
ro_unen -_ 1 management..
2. Proposed fill or substantial modification of equal to or
less than one-third of an acre o= such waters, including
wetlands, does not require written concurrence from the
Division of Environmental Management.
3_ Proposed fill of greater than one acre ir• sv, trout,
HQw, ORiq, P15-1 and W5-lj watersheds requires public
nbtice and an individual 401 Certification JET= the Divi-
sion os :Environmental Management;
4. That established sediment and erosion control practices
are utilized. to prevent violations of the ap-,:opriate
turbi.dit : water qualit',.- standard (50 NTUs it streams and
rivers not designated as trout waters by =! 25 NTUs in
all salt:•:ate= classes, and all lekes and reservoirs; 1-0
NTUs in t_ ou t waters) ;
S. That aCC_t1onal site-specific conditions mnay be added to
projects greater than One-t'!ind of an azre impact
which are proposed under this Ce_t?ficat. on _n order to
ensure ccmpl_ance with all applicable waG ez _uality and
efflucnt standards;
6. Imieasures she.'U be taken to prevent live or fresh
Conc):ete ro-: coming into contac` th waters oz the
state until` the concrete has harcened•
7 . Coils.:]?'-enca -1 ro:ii D M, th-i S Cer. of icati0ri cup! _es to .n
A.ndivi:.url project shall expire three years „O?1i the de .Le

1
1
1
1
1
1
1
1
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AUG-02-1994 18:17 TRI PROPERTIES 9199416319 P.04i06
of the cover letter from DEN,.
Non=compliance with or violation of the conditions herein seL
forth by a specific, fill project shall, result in revocation o=
this Certification for the project. .
The Director of the North Carolina Division of Environ-:=nta?
Management may require submission of a formal application =or
individual certification for any•project in this category c-
activity, if it i.s determined that the project is likely tc have
a significant adverse effect upon water quality or degrade the
eaters so that existing uses of the wetland or downstrear.i;?ters
are precluded.
Public hearings may be held for. specific applications or
group of applications pr-?o= to•a Certification decision if :eeme=
in the public's best interest by the Director of the North ::aro
Tina Division of Environmental Management.
This is the 21st day of January, 1992
DIi?r5?O:v €' NV?R0Nb1ENT_4LT• MikNAGEMENT
George T. ?t?e_eLt, D_=ecLor
gencert.26 `
jrd/gc
WQC; 2671

AUG-02-1994 18:1? TRI PROPERTIES 9199416319 P.05i06

1-1
GENERAL CERTIFICATION rOR PROJECTS ELIGIBLE
FOR CORPS OF ENGINEERS NATIONWIDE PERMIT NUMER 14 (ROAD
CROSSINGS)
This General Certification is issued in conformi_y with the
requirements of Section 401, Public Laws 92--500 and :5-217 of the
United States and subject to the -North Carolina Division of Envi-
ronmental Management Regulations in 15A NCAC 2H, Sec=ion .0500
and 15A NCAC 2B .0109 and .0201 for the discharge oz fill mate-
rial to waters and wetland areas as described in 33 ;ZFR 330
Appendix A (E) (14) of the Corps of Engineers regulations (i.e.,
Nationwide Permit No. 14).The-category of activities shall
include any fill activity for road crossing and is 1_mited to
fill less than one-third of an acre. This Certification replaces
Water Quality Certification Number 2177 issued on November 5,
1987 and Water Quality Certification Number 2666 iss•_ed on Tanu-
ary 21, 1992.
The State of North Carolina certifies that the specif ied
category of activity will not violate Sections 301, 702, 303, 306
and 307 of the Public Laws 92-500 and 95--217 if conc-_cted in
accordance with the conditions hereinafter set fort::-
Conditions of Certification:
1. Proposed fill or substantial modification of
wetlands under this General Certification re =wires writ-
ten concurrence from the Division of Envi ro _-_`ntal Man-
agement. Projects which impact waters only to not
require written concurrence.
2. if written concurrence is not issued by the _" ivision of
Environmental Management within 45 days fro- receipt of a
complete application by the Division's 401 G_rtification
Office in Raleigh, then 401 Certification is deemed to be
issued as long as the applicant follows all :ther
conditions of this Genera, Certific,
additional information is requested
Director or his designee;
3. The width of the fill is limited to
for the actual crossing;
-1- L
3tion uni_ss
in writ_-:g by the
the mi r•_-:urn, needed
gat the roauvay WIU M shall be Minimized as much as
practicable and that no practicable alternat_ve exists;
That est:ablis:-,ed sediment and erosion cont_ . - practices
are utilized zo prevent violations or the a..ro?ra.ate
vurbidi.ty wane= quality standard (30 NT'JG i- sLreL ms ar,d
rivers not des_gna,ed as trout waters by Dr 25 14T7s -in
all saltwater classes, and all lakes and r2==rvoi_s: an
10 NTILJ's in t_c-_L waters) ;
I*easures shat-. be taken to prevent live or ...^t;h concrcte
`rorr, coming inzo contact with waters of t:--e tzata until
the colic.
rze as hardened;
Teat ?dr?iti.c;;? = site-specific conditions may be add.ed to

AUG-02-1994 18:18 TRI PROPERTIES 9199416319 P.06i06
projects proposed under this Certification in order to
1 ensure compliance with all applicable water quality and
effluent standards;
8. Concurrence from DEM that this Certification applies to
an individual project shall expire three years from the
date of the cover letter from DEM.
Non-compliance with or violation of the conditions herein set:
' forth by a specific fill project shall result in revocation of
this Certification for the project.
The Director of the North Carolina Division of Environmental
' Management may require submission of a formal application for
individual certification for any project in this category of

' activity, if it is determined that. the project is likely to have
a significant adverse effect upon water quality or degrade the
waters so that existing uses of the wetland or downstream waters
are precluded.
Public hearings may be held for specific applications or
group of applications prior to a Certification decision it deemed
in the public's best interest by the Director of the North Caro-
lina Division of Environmental Management.
This is the 1st day of May, 1992

DIVISION O NVIRONMENTAL MANAGEMENT

George T.,,,verett, Director
gencert.14a
jrd/gc
WQC #2732

7
F

TOTAL P.06
10/06/17 08:52 9198469467 PAGE 08
11

Name: Trf Properties, Inc,
Address: P o Box 1 g06J_
Address: Raleigh NC 27619
Phone: 929_249
Project Name/ Description: Imperial Center Southwest Addition
Date: 22 February 1993
The Department of the Army
U.S. Army Corps of Engineers
Wilmington District
P O Box 1890
Wilmington, NC 28402
Attn: Eric Alsmeyer
Field Office: Raleigh
Re- Wetlands Related Consulting and Permitting
To Whom It May Concern:
1, the current project owner, hereby designate and authorize Soil and Environmental
Consultants, Inc. to act in my behalf as my agent in the processing of permit applications;
to furnish upon request supplemental information in support of applications, etc- from this
day forward for the Southwest Section of Imperial Center identified by Drawing No. WL-1
dated 11 February 1992 and prepared by Envirotek, Inc. This the 22nd day of
February 1993 .
I ,
Owner's am
Title:
cc: Mr. John Dorney
N-C. Department of EH & NR
Division of Env. Mgt.
Water Quality Planning
P O Box 29536
Raleigh NC 27626
Mr. Kevin Martin
Soli and Environmental Consultants, Inc.
10/06/1997 08:52 9198469467 PAGE 09
I)i.h1 Ii): Corps Action III:
Nationwide Permit Requested (Provide Nationwide Permit #): 26
Pre-Construction Notification Application
For Nationwide Permits that Require:
' 1) Notification to the Corps of Engineers
t) Ap l)lication for Section 401 Certification
:?) Coordination with the NC Division of Coastal Managetttent
' `lend tho. original and (X) copy of this completed form to the appropriate field office cif
the Corps of Engineers (see agency addresses sheet). Seven (7) copies should bo sent to
the NC: Division of Environmental Management (see agency addresses she ct), I'I .I?ASI_
' I. Owner's Name: _ Tri Properties Inc., Attn: Mr. Harry Massey
?. %Mailing, Address: P.D. Box 19067
'
Subdivision Name: lm erial Center SW
City: Raleigh 5tato. NC Zip Cade: 2701
100,1 .inn address, including subdivision namo (if different from tmidinF; addro,.,?,
ilhovc): North of Wake County/Durham County line , west of 1-40 , east of Hi hW,-3y____
54 and south of SR 1973
t) Telephone Number (Home): (Work): 829-2495„_..,__._._
'
1) If applicable, ag
ones name or responsible corpor
ate, official address, phono.
1
number:
Soil & Environmental Consultants, Inc. _ Phone: [phone]
244 W. Millbrook Road

Y _
w
Raleigh, NC 27609
i.ocation of work (provide a maps, prcforable a copy of USGS topogral)111C 111,11) or
A06al photograph with scale):
' County: Durham Noarom lo,?vn or cite: Yf TF'____

10/06/1997 98:52 9198469467 PAGE 10
/
Specific Location (include road numbers, landmarks etc.)_ North of Wake,
k -.
i County/Durham County line, east of 1-40 west of Highway 54 and South of
SR 1,973, see attached vicinity mpp___? _
0. Impacted or nearest stream/river: Stirrup Iron Creek
IZiver Basin: Neuse
it. Is project located near water classified as trout, tidal saltwater (SA), high quality
waters (HQW), outstanding resource waters (QRW), water supply (WS-1 or WS-
11)? Y1=S ( ) NO (X) If yes, explain
7h. If tho projr-ct is located within, a North Carolina division of coastal management
area of environmental concern (AEC)? YES ( ) NO (X)
71% If (ho project is located within a coastal county (see page 7 for list of coastal
coufiti0s), what is the land use plan (1,UP) designation?
1
' •`+:i. I Live any `K,ctlon 404 permits been previously requested for use on this hroporly?
YI;tY (X) NO ( ) If yes, provide Action ID number of pervious permit and
ern), aciditiortal information (including, photocopy of 40'1 certification).
'
___/fiction ID # 199301842, DEM Prot'ec
t # 95883 (93931)
81). Aro additional permit requests expected for this property in the future?
YES ( ) NO (X ) If- yea, describe anticipated work:
Unless project area is ex nded.

F..,Jirm:ttod toLil numberof acres in tract of land: -t- 200 acres _ Y
F Alrnated to(al number or acres of wetliinds locateci on projei:t silts: 9 4?_

I77
J
10/06/1997 08:52 9198469467
k

?I

PAGE 11
100, Number of acres of wetlands impacted by the proposed project by:
l-illing: 0.10 Excavation:

Drainage;
Other:
Total acres to be impacted: 0.10
I Ob- ('1) Stream channel to be impacted by the proposed project (if relocated,
provide distance both before and after relocation):
Length before: ft After: ft
Width Before (based on normal high water contours): ft
W id 0i After: fi
Average depth before: ft After: _ ft
(2) Stream channel impacts will result from: (check all that apply)
Open channel relocation: ? PlacemenL of pipe ill chi?llc7Cl: ?__}
Channel Excavation: ? Construction of a Dam/F'looding; [.
Other: -
11. If construction o( a pond is proposed, what is the site of the watershed drainilif; to
the pond? Design previously submitted to and approved by DEM
What is the expected pond surface area? Design previously submitted to and
approved by DEM ---- -
I:'. Description of proposed work including discussion of type of mechanical
oquiptnent to be used (attich plans 8 1/2" x 11" drawings only):
T'ypical road construction practices (see attached plan)..

' 10/06/1997 08:52 9198469467 PAGE 12
t:j. 111Irposr of proposed work: To allow access to upland areas for _
development
14. Mato reasons why it is believed that this activity must be carried out in L.'e lands
(include any measures taken to minimize wetland impacts): Based on
' comments by Corps and DEM previously, entire plan was revised to avoid
_Mimacts to wetland finger #10 except for the currently requested rand crossinc
15. You are required to contact the U.S. Fish and Wildlife Service (USFWS) and/or
' National Marine Fisheries Service (NMFS) (see agency addresses sheet) regardilll,
tliv presence of any federally. listed or proposed for listing endangered or
thre<atcned species or critical habitat in the permit area that may be affected by they
' prolxosod project. Date contacted: (attach responses from these af!,cncics}.
Copied with this application
16. Y<,Lr arc rc. ?quired to contact the state historic preservation officer (S1 I1'0) (secs
ilgency a(ciress sheet) regarding the presence of historic properties ill the permit
arVil Yvhic•h may be affected by the proposed project. Date contacted:
' Copied with this application. -- ---
17. Does (tie project involve an expenditure of public funds or the use of public (slate)
land?
Y I'S ( ) NO ( X ) If no, to to 18.
' a. If yes, does the project require preparation of an environmental dOCUTlloot
pursuant to the requirements of the North Carolina Environmental Policy
Act?
YIS ( ) NU
b- If yos, has the document been reviewed through the North Carolina
' I)(!part.nicnt of Administration Stat Clearinghouse?
YF.1? ( ) NO ( )
If ansv,,ers to 17b is YES, then submit appropriate documentation [rain the state
' cloarizighouse to division of environmental management regarding cc w11l1.1WV
with tho North Carolina Environmental Policy Act.

10/06/1997 08:52 9198469467 ?- PAGE 13
' Questions rrgardingt1-te State Clearinghouse review process should be dirocted to
Nis. Chrys Baggett, Director State Clearinghouse, North Carolina Department of
' Administration, 116 West Joncs Street, Raleigh, North Carolina 27603-8003,
telephone [phone].
18'. Tho following items:should be included with this application if proposed activity
involves the discharge of excavated or fill material into wetlands:
' a. Wetland delineation map showing all wetlands, streams, lakes and ponds on
the property (for Nationwide Permit numbers 14, 18, 21, 26, 29 and 38). All
streams (intermittent and permanent) on the property must be shown on the
' neap. Map scales should be 7. inch equals 50 feet or 1 inch equals 100 feet or
their equivalent.
b. If available, representative photograph of wetlands to be impacted by project.
' c. If delineation was performed by a consultant, include all data sheets relevant
to the. placement: of the delineation line.
d. Attach a copy of the stormwater management plan, if required.
' r. What is land used of surrounding property?
Commercial or undeveloped
' f. If applicable, what is proposed method of sewage disposal?
' Municipal
Sil;ned and dated agent authorization letter, if applicable.
NCB' Y'- Wetlands or Waters of the U.S. may not be impacted prior to:
11 Issuance of a Section 404 Corps of Engineers Permit,
2. Either the issuance or waiver of a 401. Division of Environmental
Management (Water Quality) certification, and
3. (in the twenty coastal counties only) .A letter from the North Carolina
Division of Coastal Management stating the proposed activity is consistent
with the North Carolina Coastal Management program.
C WFIV S, Agent's "ignature Date
' (Agent's signature valid only if
Af;vnt Authorization Letter from
tho owner is provided (1.8 g.))

C
L

J
ri
f'
REPLY TO
ATTENTION OF
Regulatory Branch
DEPARTMENT OF THE ARMY
WILMINGTON DISTRICT, CORPS OF ENGINEERS
P.O. BOX 1890
WILMINGTON, NORTH CAROLINA 28402-1890
July 21, 1995
Action TD. 199301842 and Nationwide Permit Numbers 14
and 26 (Headwaters and Isolated Waters)
Mr. Harry Massey, Jr.
Tri Properties Inc.
PO Box 19067
Raleigh, NC 27619
Dear Mr. Massey:
sc: d ' GMkl
JUL 2 b 1995
? ? MAtI. TO
G2G? SA rJGHE.Z
6lL.6644 O' MEN
(Road Crossing)
C ? E 0 W IE
JUL 2 41995 Reference ycur request for permit reauthorization of June 23, 1995, ti
submitted on your behalf by Soil and Environmental Consultants, Inc., for
Department of the Army permit to discharge fill material within waters of the
United States, causing the loss of a total of 2.98 acres of wetlands (0.10 for
road crossings and 2.88 for buildings, parking, and stormwater retention)
adjacent to, and above the headwaters of, an unnamed tributary to Stirrup Iron
Creek, for construction of the proposed Imperial Center development, east of
N.C. 54 and south of Page Road, southeast of Durham, Durham County, North
Carolina.
For the purposes of the Corps of Engineers' Regulatory Program, Title
33, Code of Federal Regulations (CFR), Part 330.6, published in the Federal
Register on November 22, 1991, lists nationwide permits. Authorization was
provided, pursuant to Section 404 of the Clean Water Act, for discharges of
dredged or fill material into headwaters and isolated waters.
' Authorization, pursuant to Section 10 of the Rivers and Harbors Act of
1899 and Section 404 of the Clean Water Act, was also provided for fills for
roads crossing waters of the United States (including wetlands and other
special aquatic sites) provided:
' a. The width of the fill is limited to the minimum necessary for the
actual crossing;
' b. The fill placed in waters of the United States is limited to a
filled area of no more than one-third acre. Furthermore, no more than a total
of 200 linear feet of the fill for the roadway can occur in special aquatic
sites, including wetlands;
' c. The crossing is culverted, bridged or otherwise designed to prevent
the restriction of, and to withstand, expected highflows and the movement of
aquatic organisms;
' d. The crossing, including all attendant features, both temporary and
permanent, is part of a single and complete project for crossing of a water of
the United States; and
' e. For fills in special aquatic sites, including wetlands, the
permittee notifies the District Engineer in accordance with the "Notification"
general condition.
' Your work, impacting a total of 2.98 acres of wetlands, is authorized by
these nationwide permits provided it is accomplished in strict accordance with
your submitted plans, the enclosed conditions. These nationwide permits do
' not relieve you of the responsibility to obtain other required State or local
approvals.
' Printed on ® Recyded Paper

-2-
This verification will be valid until the nationwide permit is modified,
reissued or revoked, which will occur prior to January 21, 1997. It is
incumbent upon you to remain informed of changes to the nationwide permits,
which will be announced by public notice when they occur. If you commence, or
are under contract to commence, this activity before the date the nationwide
permit is modified or revoked, you will have twelve months from the date of
the modification or revocation to complete the activity under the present
terms and conditions of this nationwide permit.
Please note that this authorization is valid for the work described
above only, and impacts of subsequent projects on this property would have to
be considered cumulatively with these impacts, regardless of future
subdivision or ownership of the property. Questions or comments may be
addressed to Mr. Eric Alsmeyer of my Raleigh Field office regulatory staff, at
telephone [phone], extension 23.
' Sincerely,

G. Wayne Wright
Chief, Regulatory Branch
Enclosure
Copy Furnished (with enclosure):
1 and Environmental Consultants, Inc.
' Attn: Kevin Martin
244 West Millbrook Rd.
Raleigh, NC 27609
' Copies Furnished (without enclosure):
Mr. John Dorney
Water Quality Section
' Division of Environmental
Management
North Carolina Department of
Environment, Health and
' Natural Resources
Post Office Box 29535
Raleigh, NC 27626-0535%
Mr. Steve Medlin
Durham City/County Planning
Inspection Department
101 City Hall Plaza
' Durham, North Carolina 27701
u

' GENERAL CONDITIONS
1. Navigation. No activity may cause more than a minimal adverse effect on
navigation.
' 2. Proper Maintenance. Any structure or fill authorized shall be properly
maintained, including maintenance to ensure public safety.
3. Erosion and Siltation Controls. Appropriate erosion and siltation
controls must be used and maintained in effective operating condition during
construction, and all exposed soil and other fills must be permanently
stabilized at the earliest practicable date.
4. Aquatic Life Movements. No activity may substantially disrupt the
movement of those species of aquatic life indigenous to the waterbody,
' including those species which normally migrate through the area, unless the
activity's primary purpose is to impound water.
S. Equipment. Heavy equipment working in wetlands must be placed on mats or
other measures must be taken to minimize soil disturbance.
6. Regional and Case-by-case Conditions. The activity must comply with any
regional conditions which may have been added by the Division Engineer and any
case specific conditions added by the Corps.
7. Wild and Scenic Rivers. No activity may occur in a component of the
National Wild and Scenic River System; or in a river officially designated by
Congress as a "study river" for possible inclusion in the system, while the
river is in an official study status. Information on Wild and Scenic Rivers
may be obtained from the National Park Service and the U.S. Forest Service.
' S. Tribal Rights. No activity or its operation may impair reserved tribal
rights, including, but not limited to, reserved water rights and treaty
fishing and hunting rights.
9. Water Quality Certification. In certain states, an individual state
water quality certification must be obtained or waived.
10. Coastal Zone Management. In certain states, an individual state coastal
zone management consistency concurrence must be obtained or waived.
1 11. Endangered Species. No activity is authorized under any NWP which is
likely to jeopardize the continued existence of a threatened or endangered
species or a species proposed for such designation, as identified under the
Federal Endangered Species Act, or which is likely to destroy or adversely
modify the critical habitat of such species. Non-Federal permittees shall
notify the District Engineer if any listed species or critical habitat might
be affected or is in the vicinity of the project and shall not begin work on
the activity until notified by the District Engineer that the requirements of
CL 7 -GC'r1N

' -2-
the Endangered Species Act have been satisfied and that the activity is
authorized. Information on the location of threatened and endangered species
can be obtained from the U.S. Fish and Wildlife Service and National Marine
Fisheries Service.
12. Historic Properties. No activity which may affect Historic Properties
listed, or eligible for listing, in the National Register of Historic Places
is authorized, until the District Engineer has complied with the provisions of
33 CFR 325, Appendix C. The prospective permittee must notify the District
Engineer if the authorized activity may affect any historic properties listed,
determined to be eligible, or which the prospective permittee has reason to
believe may be eligible for listing on the National Register of Historic
Places, and shall not begin the activity until notified by the District
Engineer that the requirements of the National Historic Preservation Act have
been satisfied and that the activity is authorized. Information on the
location and existence of historic resources can be obtained from the State
' Historic Preservation Office and the National Register of Historic Places (see
33 CFR 330.4(g)).
13. Notification.
a. Where required by the terms of the NWP, the prospective permittee must
notify the District Engineer as early as possible and shall not begin the
activity:
(1) until notified by the District Engineer that the activity may
proceed under the NWP with any special conditions imposed by the District or
Division Engineer; or
' (2) if notified by the District or Division Engineer that an
individual permit is required; or
(3) Unless-30 days have passed from the District Engineer's receipt
of the notification and the prospective permittee has not received notice from
the District or Division Engineer. Subsequently, the permittee's right to
1 proceed under the NWP may be modified, suspended or revoked only in accordance
with the procedure set forth in 33 CFR 330.5(d)(2).
b. The notification must be in writing and include the following
information and any required fees:
(1) Name, address and telephone number of the prospective permittee;
(2) Location of the proposed project;
' (3) Brief description of the proposed project; the project's purpose;
direct and indirect adverse environmental effects the project would cause; any
1 1
' -3-
other NWP(s), regional general permit (s) or individual e
rmit(s) used or
intended to be used to authorize any p
activity; Y Part of the proposed project or related
(4) Where required by the terms of the NWP, a delineation o
special aquatic sites, including wetlands; and f affected
' (5) A statement that the prospective permittee has contacted;
(a) The USFWS/NMFS regarding the presence of any Federally
(or proposed for listing) endangered or threatened species or critical hablisted
itat
in the permit area that may be affected by the proposed project; and any
available informatiorr provided by those agencies. (The prospective permittee
1 may contact Corps District offices for USFWS/NMFS agency contacts and list of
critical habitat.)
(b) The SHPO regarding the presence of any historic properties in
the permit area that may be affected by the proposed project; and the
available information, if any provided by that agency.
14. Water Supply Intakes. No discharge of dredged or fill
y material may occur
in the proximity of a public water su 1
repair of the public water supply intake stintake ructures cortadwhere jacent hbankscharge is
' stabilization.
1 25. Shellfish Production. No discharge of dredged or fill material may occur
in areas of concentrated shellfish production, unless the discharge is
directly related to a shellfish harvest activity authorized by nationwide
permit.
16. Suitable Material. No discharge of dredged or fill material may consist
of unsuitable material (e.g., trash, debris, car bodies, etc.) and material
' discharged must be free from toxic pollutants in toxic amounts.
17• Mitigation. Discharges of dredged or fill material into waters of the
United States must be minimized or avoided to the maximum extent practicable
at the project site (i.e., on-site), unless the District Engineer has a
a compensation mitigation plan for the specific regulated activity, pproved
18. Spawning Areas. Discharges in spawning areas durin s
must be avoided to the maximum extent practicable, g pawning seasons
19. Obstructions of High Flows. To the maximum extent
practicable, must not permanently restrict or impede the passage of normal or
expected high flows or cause the relocation of the water (unless the primary
' purpose of the fill is to impound waters).
r
11

-4-
20. Adverse Impacts from Impoundments. If the discharge creates an
impoundment of water, adverse impacts on the aquatic system caused by the
accelerated passage of water and/or the restriction of its flow shall be
minimized to the maximum extent practicable.
21. Waterfowl Breeding Areas. Discharges into breeding areas for migratory
waterfowl must be avoided to the maximum extent practicable.
22. Removal of Temporary Fills. Any temporary fills must be removed in their
entirety and the affected areas returned to their preexisting elevation.
' INFORMATION
' a. All crossings must be from high ground to high ground.
b. Bridging will be required in areas designated as anadromous fish spawning
areas by the North Carolina Division of Marine Fisheries (NCDMF) or the North
' Carolina Wildlife Resources Commission (NCWRC) if the District Engineer (DE)
determines that use of culverts--would likely preclude the continued use of the
upstream waters as spawning areas for the anadromous fish.
' NATIONWIDE CONDITIONS
a. The width of the fill is limited to the minimum necessary for the actual
crossing.
b. The fill placed in waters of the U.S. is limited to a filled area of no
' more than 1/3 acre.
c. No more than a total of 200 linear feet of the fill for the roadway can
occur in special aquatic sites, including wetlands.
d. Crossing is culverted, bridged or otherwise designed to prevent the
' restriction of, and to withstand, expected high flows and tidal flows and the
movement of aquatic organisms.
e. The crossing, including all attendant features, both temporary and
permanent, is part of a single and complete project for crossing of a water of
the U.S.
f. Fills in special aquatic sites, including wetlands, require a 30-day
notification to the District Engineer (DE). The notification must include a
' delineation of affected special aquatic sites, including wetlands.
g. Where local circumstances indicate the need, the District Engineer (DE)
will define the teem "expected high flows" for the purpose of establishing
' applicability of this nationwide permit.
STATE CONSISTENCY CONDITIONS
a. If the proposed activity is within the North Carolina Coastal Area, the
applicant must receive written concurrence from the North Carolina Division of
' Coastal Management (NCDCM) that the activity is consistent with the North
Carolina Coastal Management Program.
' b. All fill material authorized by this permit must be obtained from an
upland source.
c. Udder this permit, bridging is required in areas designated as anadromous
fish spawning areas by the North Carolina Division of Marine Fisheries (NCDMF)
or the North Carolina Wildlife Resources Commission (NCWRC) in order to allow
CL7-14
.1. 1
' -2-
the continued use of upstream waters for spawning. Use of culverts in these
situations is not authorized under this permit.
d. Should all or part of a proposed activity be located within an Area of
Environmental Concern (AEC) as designated by the North Carolina Coastal
Resources Commission (NCDCM), a Coastal Area Management Act (CAMA) permit is
required from the North Carolina Division of Coastal Management (NCDCM).
' Should an activity within or potentially affecting an AEC be proposed by a
Federal agency, a consistency determination pursuant to 15 CFR 930 must be
provided to the NCDCM at least 90 days before the onset of the proposed
activity.
-GENERAL CERTIFICATION CONDITIONS
1. a. Proposed fill or substantial modification under this General
Certification requires written concurrence from she North Carolina Division of
Environmental Management (NCDEM).
• b. If written concurrence is not issued by the North Carolina Division of
Environmental Management (NCDEM) within 45 days from receipt of a complete
application by the Division's Section 401 Certification Office in Raleigh,
then Section 401 Certification is waived for this Nationwide Permit unless
additional information is requested in writing by the Director.
c. The width of the fill is limited to the minimum needed for the actual
crossing.
d. The roadway width shall be minimized as much as practicable and that no
practicable alternative exists.
e. Established sediment'and.erosion -control practices will be utilized to
prevent violations of the appropriate turbidity water quality standard (50
NTU's in streams and rivers not designated as trout waters by the North
' Carolina Division of Environmental Management (NCDEM), 25 NTU's in all
saltwater classes and all lakes and reservoirs and 10 NTU's in trout waters).
f. Measures shall be taken to prevent live or fresh concrete from coming
into contact with waters of the State until the concrete has hardened.
' g. Additional site-specific conditions may be added to this Certification in
order to ensure compliance with all applicable water quality and effluent
standards.
• h. Concurrence from the North Carolina Division of Environmental Management
(NCDEM). that ts therdatecofltheacoversleto an tter fromvtheaNCDEM?ect shall expire
three years from

GENERAL CONDITIONS
1. Navigation. No activity may cause more than a minimal adverse effect on
navigation.
Any structure or fill authorized shall be properly
, Proper Maintenance.
2
maintained, including maintenance to ensure public safety.
' 3. Erosion and Siltation Controls. Appropriate erosion and siltation
controls must be used and maintained in effective operating condition during
construction, and all exposed soil and other fills must be permanently
stabilized at the earliest practicable date. disrupt the
4, Aquatic Life Movements. NOslife indigenousntoathe waterbody,
movement of those species of aquatic
including those species which normally migrate through the area, unless the
' activity's primary purpose is to impound water.
Equipment. Heavy equipment working in wetlands must be placed on mats or
t other measures must be taken to minimize soil disturbance.
with any
6. Regional and Case-by-case Conditions. The activity must comply
regional conditions which may have been added by the Division Engineer and any
' case specific conditions added by the Corps.
esignated by
or in a riverlofficiallye d of the
7. Wild and Scenic Scenic River System; activity
National Wild and Scen while the
' Congress as a "study river" for possible inclusion in the system,
river is in an official study status. Information on Wild and Scenic Rivers
may be obtained from the National Park Service and the U.S. Forest Service
tribal
g, Tribal Rights. No activity or its operation may impair reserved
rights, including, but not limited to, reserved water rights and treaty
fishing and hunting rights.
Certification. In certain states, an individual state
water Quality
quality certification must be obtained or waived.
10. zone Coastal Zone Management. In certain states, an individual state coastal
zone management consistency concurrence must be obtained or waived.
ii. likely Endangered species. No activity is authorized under any NWP which is
likely to jeopardize the continued existence at ionthasaidentified underrthe
' proposed for such design to destroy or adversely
species or a species prop or adversely shall
Federal Endangered Species Act, or which is likely
modify the critical habitat of such listedsspeciesForecritical habitat might
be aff notify the ected or District Engineer y of the project and shall not begin work
is in the vicinity
the activity requirements of
until notified by the District Engineer that the the Endangered Sp ation Act have een
the locationloflthreatenedtandeendangeredlspecies
authorized. Inform
can be obtained from the U.S. Fish and Wildlife Service and National Marine
Fisheries Service.
Historic
of Historic Places
12. Historic Properties. No which may affect
'
listed, or eligible for listing, the District
is authorized, until the he gererhas mitteepmust nwith otify the provisions of
33 CFR 325, App ic Place
endix C. The prospective p historic properties listed,
Engineer if the authorized activity may affect any Register of Historic prospective
for listing onethe National Reg'stte tee has reason to
perm determined to be eligible,
believe may be eligible

' 2-
places, and shall not begin the activity until notified by the District
Engineer that the requirements of the National Historic Preservation Act have d. Inf
on t been d eXistencet activity is obtai rma en dtfrom thehState
location ion and
Historic Preservation Office and the National Register of Historic Places see
' 33 CFR 330 .4 (g))
13. Notification. ive a. Where required by the terms of the NWP, the er ande shall norm beg in the
possible
' must notify the District Engineer as early as
activity:
(1) until notified by the District Engineer that the activity may
proceed under the NWP with any special conditions imposed by the District or
Division Engineer; or
(2) if notified by the District or Division Engineer that an
individual permit is required; or
(3) Unless 30 days have passed from the District Engineer's receipt
entlee thas he not recpermitteeeivedright notice from
of the notification and the prospective permitt
the District or Division Ebelmodified, suspended,or revoked only in accordance
proceed under the NWP may
with the procedure set forth in 33 CFR 330.5(d)(2)•
b. The notification must be in writing and include the following
' information and any required fees:
(1) Name, address and telephone number of the prospective
permittee;
(2) Location of the proposed project;
(3) Brief description of the proposed project; the project's
purpose; direct and indirect adverse environmental effects.the project would
cause; any other NWP(s), regional general permit(s) or individual permit(s)
art of the proposed project or
used or intended to be used to authorize any p
' related activity;
(4) Where required by the terms of the NWP, a delineation of
' affected special aquatic sites, including wetlands; and
(5) A statement that the prospective permittee has contacted;
(a) The USFWS/NMFS regarding the presence of any Federally
listed (or proposed for listing) endangered or threatened species or ccritical
available ' permit area that may be affected by the habitat in the information provided by those agencies. (The prospective
permittee may contact Corps District offices for USFWS/NMFS agency contacts
and list of critical habitat.) erties
(b) The SHPO regarding the p the proposed project; and he
in the permit area that may be affected by
available information, if any provided by that agency.
occur
14. Water Supply Intakes. No discharge of dredgexceptfill material may oc is
in the proximity of a public water supply
repair of the public water supply intake structures or adjacent bank
' stabilization.

'3-
15. Shelloficoncentrated ischarge of occur
d related to a shellfish harvest activity authorized by nationwide
directlectly
permit.
16. suitable Material. No discharge of dredged or fill material may consist
of unsuitable material (e.g., trash, debris, car bodies, etc.) and material
discharged must be free from toxic pollutants in toxic amounts.
17. ers of the
United Mitigation. Discharges dredged or f ill
avoided to mamaximumterial
' United states must b me., on-site)
at the project site ( (i.e., on-site), unless the District Engineer has approved
a compensation mitigation plan for the specific regulated activity.
18Spawning Areas. Discharges in spawning areas during spawning seasons
must be avoided to the-maximum extent practicable.
passagepracticable,
di normal or
19. Obstructions of High
restrict orximpede extent
discharges must not permanently
expected high flows or cause the relocation of the water (unless the primary
purpose of the fill is to impound waters).
20. Adverse Impacts from Impoundments. If the discharge creates an the
impoundment of water, adverse impacts on the aquati system by
accelerated passage of water and/or the restriction of its flow shall be
minimized to the maximum extent practicable.
' 21. Waterfowl Breeding Areas. Discharges into breeding areas for migratory
waterfowl must be avoided to the maximum extent practicable.
22. Removal of Temporary Fills. Any temporary fills must be removed in their
entirety and the affected areas returned to their preexisting elevation.

CL7-GCWN

NATIONWIDE CONDITIONS
' a. The discharge does not cause the loss of more than 10 acres
acreage of
waters of the U.S. For the purpose of this nationwide permit, the loss of waters of the U.S. includes the filled area plus waters of tae U.S.
that are adversely affected by flooding, excavation, or of the project.
b. A 30-day notification to the District Engineer (DE) is required if
the discharge would cause the loss of water of the U.S. greater than one acre.
' For discharges in special aquatic sites, including wetlands, the notification
must include a delineation of affected special aquatic sites including
wetlands.
1 c. The discharge, including all attendant features, both temporary and
permanent, is part of a single and complete project.
STATE CONSISTENCY CONDITIONS
a. All fill material authorized by this permit must be obtained from an
upland source.
b. Use of this nationwide permit for waste disposal facilities is not
authorized.
C. If the proposed activity is within the North Carolina Coastal Area
and the activity will result in the loss ofaers ofthe UnitedcStatesence
greater than 1/3 of an acre, the applicant mwt
from the North Carolina Division of Coastal Management (NCDCM) that thactivity is consistent with the North Carolina Coastal Management Program.
' d. Should all or part of a proposed activity be located within an Area
of Environmental Concern (AEC) as designated by the North Carolina Coastal
required
Resources Commission, a Coastal Area Management Act (CAMA) pe is Should
ufrom the North Carolina Division of Coastal Management (NCDCM)' Federal
activity within or potentially affecting an AEC be proposed by a oral provided to
agency, a consistency determination pursuant to 15 CFR 930 must be the NCDCM at least 90 days before the onset of the proposed activity.
GENERAL CERTIFICATION CONDITIONS
watersheds. General tcertificaone tionris in
a. General WSfIcand WS-II denied for fills
i SA, trout, HQW HQW, ORW' than
offills moretha one acres and in those
acre issued for all
watersheds specified
b. Proposed fill or substantial modification of greater than one-third
of an acre of such waters, including wetlands, requires
from the North Carolina Division of Environmental Management (NCDEM).
C. Established sediment and erosion control practices wills been utilized
to prevent violations of the appropriate turbidity water quality
NTU's in streams and rivers not designated as rout waters by thin North
Carolina Division of Environmental Management (NCDEM), 25 NTU's all
saltwater classes and all lakes and reservoirs and 10 NTU's in trout waters).
taken to prevent live or fresh concrete from
d. Measures shall be
coming into contact with waters of the State until the concrete has hardened.
e. Additional site-specific conditions may be added to this quality
Certification in order to ensure compliance with all applicable water and effluent standards.
f. Concurrence from the North Carolina stonanfindividualnproject
Management (NCDEM) that this Certification applies
shall expire three years from the date of the cover letter from the NCDEM.
CL7-26.WN
06/21/1996 12:39 9198469467

i

State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Environmental Management
James B. Hunt, Jr., Govemor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
Mr. Harry Massey,-Jr.
Tri Properties, Inc.
P.O. Box 19067
Raleigh, NC 27619
Dear Mr. Massey:
Re: Stormwater approval
Imperial Center
DEM #95683
Durham County
P--"-GE 01
,&?j
pop
L7EHNR
June 17, 1996

la"I 3 1991
VI ?ig
DEM has reviewed your plans for a storrnwaoer plan for your development near I-40
near the Wake/Durham County line. The plans are acceptable and satisfy the condition of
our Certifications issued on 14 July 1995,,;Y January 1994 and 15 March 1993.
2
Please call Mr. John Deny of my staff' at 733-1786 if you have any questions.

cc: Scott Thomas
Kevin Martin; Soil and Ep ronmental
Central files i
,
Division of Environmental AAanapernam - Environmental Sciences Branch
4401 Reedy Creek Rd., Raleigh, NC 27628-06315 - TNaphone 919-733-1786 - FAX [phone]
An Equal Opportunity Af Irmadve Action Employw 50% recycled/ 10% post-consumer paper
Sincerely,

?nl

F
L

J
10/06/1997 08:52

9198469467
`r PAGE 04
Soil & Environmental Consultants, Inc.
211 \Eost Millbto ok Roa(l ¦ ltak•iglr, Not-Ill C;irolintl L7609 IN (919) 816-`-)1)00 w F;1x (1)lt?•)
Novemller 29, 10(.)(,
N(..'I )I;l I cat NR - i)WQ
Walor Quality Planning
Attn: Mr. John Dorney
4401 Reedy Creek Road
Raleigh, NC 27607
loth Mr. Dorncy and Ms. Manuele:
US Army Corps of Engineers - Regulatory
Attn: Ms. jean Maneule
6500 Falls of the Neuse Road
Suite 120
Raleigh, NC 27615
•1'ht' purpose of this letter is to request Nationwide Permits 14 and 26 and a 401
1lrator Quality Certification for the project to be known as the Imperial Center
Proporty in Durham County, NC. Mr. Alsmeyer of the Corps has previously
illtliroved our wetland delineations and Nationwide Permits. The projoc-t
al!,o Itroviously reviewed by the DEM. The attached plan shows proposod
V? t•tiands "fill" sites for roads and size of 1,Vi'tt(?rs of the U.S. to be llllpac.•tod at
vach fill site. 'Ill(,, project was redesigned Lo avoid impacts to wedilild firlgor V 10
W, previously requested by your offices. Tho only additional impact; ro"Imred to
uttlizo uplands will be road crossings.
Nationwide llormits 14• and 26 were previously obtained for part of the proJoct (o
allc)w development of the project site. The previously permitted fill under
Nationwide Permit 26 and 14 was 3.387 acres (NW14 = 0.189 acres, NW 26
3.1015 acres). For the final stage of the project, it will be necessary to impact 0.10
acrk-s utilizing Nationwide 26 for a road crossing; that is necessary for access and
traffic flow (see attached plans).
We have worked with the developer and architect (l nvirotek) extensively to
winirnizC total impacts, especially to high value areas. The main stream channel
Ili-it dissects the site has no impacts to it except for a road crossing and the
r11"1111on pot)d previously required and pe..rmitte.d. A vogctaled puffer- will hk.,
rl miiiained alo nf; till` major creek which travvrs(:'s the project situ 11) aroas Hui[
.irt• lint already developed and the reter1tiO1l 1)Ond will aiSO hClp maintain t..';.it01-
tilr:llity.
u ! 1;,, 1l Ii\f l,t,tlly, 11111 1'11 .1t a1 An;rl?,:i: d \1 ti:inll:. M:rllltin;; :Intl NIi111:1i, ni ¦ I i1 a uiliil r1i.,? '. ,.
1 ,i, ',111 \1'';i?,11• •lit`I{1nt•rlt `;V:11'I11:,, I`t':11n:111111t :alit t)?'hl{'t1
10/06/1997 08:52 9198469467 PAGE 05
f
' Apprommalol), 1.13 acres of vegetated wetland were required to he croatecl
alollp; the l,onc{ 111klrgin whets it is COrlstrurtCd Which will partially Offset in11mcls.
Pll`,1!+(` ('()ntilc't 1110 if you hilve gUOStlolls or requlno. additional information. VVo
approciato your willingness to work with us toward the econoinical and timely
' c'0111 Motion ( this project. If you plall to visit the site, plc"aso let us kno%v so Wo
.!n Arr<111ge for sonicone to accompany you.
' `zinc crelY,
Kevin C:'. Martin
' Prr.sidont
II Cis 111-(.
CC.
NC: Cultural Resources
Ufa Fish and Wildlife Service
National Marine Fisheries Services
KCNI Inag
10/06/1997 08:52 9198469467 PAGE 06
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H

5 December 1996 3KrqV
C 0,0 Envirotek, Inc.
1111 Oberlin Road
Raleigh NC 27605 USA
Telephone: [phone]
Telefax: 919-839-2255
architects engineers planners
Department of the Army
Corps of Engineers
6512 Falls of the Neuse Road, Suite 105
Raleigh, North Carolina 27615
Attn: Eric Alsmeyer
Jean Manule
Regulatory Project Managers
RE: Imperial Center
Durham, North Carolina
Dear Mr. Alsmeyer/Ms. Manule:
Imperial Center is proceeding with the construction of multiple projects in reliance of the permits issued in July
1995. These projects are also based on a development plan approved by the City of Durham.
Direct expenditures on surveying, soils consultants, and engineering exceed $50,000.
Expenditures on projects commenced with reliance of the permits are as follows:
1. Jogging Trail Phase 2 Total cost SL%,000 Spent to date $50,000
2. Water Quality Pond Total cost $650,000 Spent to date $100,000
3. Entrance Road Total cost $900,000 Spent to date $900,000
4. Brighton Hall Total cost $5,000,000 Spent to date $5,000,000
5. Yorkshire Place Total cost $4,500,000 Spent to date $1,200,000
6. Misc. Grading Projects Total cost $150,000 Spent to date $5,000
Some of the expenditures are pre-construction and were expended on efforts to secure permits but a much more
significant amount is involved in project construction cost.
Supporting evidence of these expenditures is available and will be furnished if requested.
Please furnish us confirmation that our project has "commenced" and is eligible for the 12 month extension when
the nationwide permits expire in January 1997.
If this information is not adequate for such a determination, please advise us what additional information you
need in order to make such a determination. If we do not receive a notice denying our extension or requesting
additional information we will assume we have received an extension and continue with the proposed
construction.
Sincerely,
Michael Gibbons
IC96EN BBT/MJG

cc: David Davenport
Ben Taylor
Kevin Martin

0

0

State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
9199416319 P.02i02
AI?EHNFR
December 12,1996
Durham County
DWQ Project # 961105
APPROVAL of 401 Water Quality Certification and ADDITIONAL CONDITIONS
Tri-Properties, Inc.
Attn: Mr. Harry Massey m2w
P.O. Box 19067
Raleigh, NC 27619 DEC 1 8 1996
Dear Mr. Massey:
You have our approval to place fill material in 0.1 acres of wetlands or waters for the purpose uf
' constructing a road dossing and lot fill at Imperial Center Property, as you described in your application dated
29 November 1996. After reviewing your application, we have decided that this fill is covered by General
Water Quality Certification Numbers 2732 and 2671. These certifications allow you to use Nationwide
Permit Numbers 14 and 26 when they are issued by the Corps of Engineers.
' This approval is only valid for the purpose and design that you described in your application except as
modified below. If you change your project, you must notify us and you may be required to send us a new
application. If total wetland fills for this project (now or in the future) exceed one acre, compensatory
mitigation may be required as described in 15A NCAC 2H.0506 (h) (6) and (7). For this approval to be
' valid, you must follow the conditions listed in the attached certification and any additional conditions listed
below. An additional 0.1 acre of littoral shelf creation shall be added to the planned litteral shelf to satisfy
requirements 15A NCAC 2H.0506(h)(6). Written DWQ approval is required for the mitigation plan before
wetland fill occurs. In addition, you should get any other federal, state or local permits before you go ahead
with your project including (but not limited to) Sediment and Erosion Control, Coastal Stormwater, Non-
Discharge and Water Supply Watershed regulations. This approval will expire when the accompanying 404 or
LAMA permit expires unless otherwise specified in the General Certification.
' If you do not accept any of the conditions of this certification, you may ask for an adjudicatory hearing.
You must act within 60 days of the date that you receive this letter. To ask for a hearing, send a written
petition which conforms to Chapter 150B of the North Carolina General Statutes to the Office of
Administrative Hearings. P.O. Box 27447, Raleigh, N.C. 27611-7447. This certification and its conditions
' are final and binding unless you ask for a hearing.
This letter completes the review of the Division of Water Quality under Section 401 of the Clean Water
Act. If you have any questions, please telephone John Domey at 919-733,1736.
simerely,
eston ar , Jr. P.E.
Attachment
' cc: Wilmington District Corps of Engineers
Corps of Engineers Raleigh Field Office
Raleigh DWQ Regional Office
Mr. John Domey
' Central Files
961105.1tr
' Division of Water Quality • Environmental Sciences Branch
Environmental Sciences Branch, 4401 Ready Creek Rd., Raleigh, NC 27607 Telephone [phone] FAX # [phone]
An Equal Opportunity Affirmative Action Employer • SO% recycled/10% post consumer paper
St's- Zc wF1o
TOTAL P.02
DEC-12-1996 08:54 TRI PROPERTIES

DEPARTMENT OF THE ARMY
WILMINGTON DISTRICT, CORPS OF ENGINEERS
P.O. BOX 1890
WILMINGTON, NORTH CAROLINA 28402-1890
REPLY TO
ATTENTION OF December 19, 1996
Regulatory inch
3c wo sP7
Pr(' 2
Action ID. 199301842 and Nationwide Permit Numbers 14
Crossing) an-4 26 (Headwaters and Isolated Waters)
Mr. Michael Gibbons
' Envirctek, Inc.
111 Oberlin Road
Raleigh, North Carolina 27605

C

Dear Mr. Gibbons:
3 87
?J D
11-4v
g.1It.1?
(Road
FA X
Reference your December 5, 1996 letter, submitted on behalf
of TriProperties, Inc., requesting confirmation that the subject
project is "grandfathered" under the present terms and conditions
of the nationwide general permit (NWP). The project will impact
3.4 acres of waters of the United States, including wetlands, for
additional construction in the Imperial Center commercial
development, in Research Triangle Park, in Durham County, North
Carolina.
Pursuant to Title 33 of the Code of Federal Regulations,
Section 330.6,b), "activities which have commenced (i.e., are
under construction) or are under contract to commence in reliance
upon an NWP gill remain authorized provided the activity is
completed witn,in twelve months of the date of an TrWP's
expiration, modification, or revocation." Based on the
information you provided in your letter, indicating that you have
committed substantial resources in reliance on the NWP, we have
determined that you have commenced the activity before
January 21, 1997. Therefore, you will have until January 21, 1998
to complete to activity under the present terms and conditions
of these nationwide permits.
L

-2-
Please note that this authorization is valid for the work
described above only, and impacts of subsequent projects on this
property would have to be considered cumulatively with these
impacts, regardless of future subdivision or ownership of the
property.
Questions or comments may be addressed to Mr. Eric Alsmeyer
of my Raleigh Field office regulatory staff, at telephone
[phone], extension 23.
Sincerely,
S. Kenneth Jolly J
Manager, Raleigh Regulatory
Field Office

ICWQPI 28 Oct 1997 Page 10
APPENDIX F
Imperial Center Stormwater Lake
Wetland Mitigation Plan
by
Soil & Environmental Consultants
25 March 1997
WATER QUALITY POND
AND
WETLAND FILL
PROJECT COMPLETION DOCUMENTATION
22 OCTOBER 1997
r
n
i
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r
rv
u
IMPERIAL CENTER STORMWATER LAKE
WETLAND MITIGATION PLAN
DURHAM, DURHAM COUNTY,
NORTH CAROLINA
SUBMITTED IN COMPLIANCE
WITH A CONDITION OF THE
401 WATER QUALITY CERTIFICATION
PREPARED FOR:
Tri Properties, Inc.
1009 Slater Road, Suite 110
Durham, NC 27705
PREPARED BY:
Mike Ortosky - Soil Scientist
Chris Huysman - Biologist
Soil and Environmental Consultants, Inc.
Job Number. 2699
3/25/97
c
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E
i
IMPERIAL CENTER
WETLAND MITIGATION PLAN
EXECUTIVE SUMMARY:
INTRODUCTION:
IMPACT SITE:
MITIGATION SITE:
REFERENCE ECOSYSTEM:
MITIGATION GOALS:
SUCCESS CRITERIA:
COMPONENTS OF THE MITIGATION SITE:
MITIGATION SEQUENCE:
MONITORING AND MANAGEMENT:
Appendix 1: Planting Plan and Specifications
Appendix 2: Proposed Potential Sources for Plant Material
Appendix 3: Proposed Seed Mixture for Stabilization
Appendix 4: List of Plan Authors and References
Map 1: Site Vicinity Map
Map 2: Mitigation Site Map
Attachment 1: As-built Plans
Attachment 2: Pre-construction Meeting Log for Imperial Center
1
Soil and Environmental Consultants, Inc.
Job Number: 2699
3/25/97
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2
2
3
3
4
4
5
5
6
9
13
14
15
16
17
18
19
' DVIPERIAL CENTER
WETLAND MITIGATION PLAN
I EXECUTIVE SUMMARY
Soil and Environmental Consultants, Inc. (S&EC), in conjunction with Tri Properties, Inc.
and Envirotek, Inc. (clients), has developed this mitigation plan to satisfy a NC Division of
Water Quality (DWQ) requirement for issuance of a 401 Water Quality Certification for
the Imperial Center in Durham, NC. The impacted wetlands and wetland mitigation sites
are located within the Stirrup Iron Creek drainage basin; as shown on Map 1: Site Vicinity
Man ( USGS topo). Water quality protection will be afforded by the establishment of a
vegetated littoral bench on the stormwater pond. The success and progress of the project
will be quantified over a period of five years with reports periodically furnished to DWQ
and the Army Corps of Engineers (COE). Mitigation success will be measured in terms of
herbaceous coverage and woody plant survival. Plant material that is to be added to the
site will be suited for the soils and final hydrology and will be derived from local sources.
Hydrology at the mitigation site will be provided by maintenance of normal pool elevation
within the stormwater pond. The proposed mitigation satisfies a 401 Water Quality
Certification Condition placed on the project in 1994. No endangered species,
archeological resources, or hazardous waste sites will be impacted by this effort.

INTRODUCTION:
i
tes as well as
This mitigation plan describes the impact sites and the resulting mitigation s
the reference ecosystems used in planning the mitigation activities. Mitigation goals and
' success criteria are discussed as guidance to the development of the mitigation plan. The
components of the proposed mitigation site (vegetation, soils, hydrology) are described as
interrelated components of the overall plan. A mitigation sequence is offered as guidance
' in scheduling and installation of the mitigation components. Finally, monitoring and
management of the mitigation site are discussed as a means of assuring the long-term
success of the project.

EMPACT SITE:
The impact sites are headwaters forested areas and freshwater marsh types. Wetland
vegetation at the impact site consists of the species fisted below which are found within
jurisdictional areas. Soils, in wetland areas, were determined to be poorly drained
Wehadkee Soils.
VEGETATION WITHIN THE RAPACT SITE*
Acer rubrum red maple fac
Acer negundo box-elder facw
2
Soil and Environmental Consultants, Inc.
Job Number: 2699
3/25/97

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HAPERIAL CENTER
WETLAND MITIGATION PLAN
Alnus serrulata tag alder facw+
Betula nigra river birch facw
Boehmeria cylindrica false nettle facw+
Carex spp. Sedge facw(+)
Cornus amomum silky dogwood facw+
Corylus cornuta beaked hazel-nut facw
Eleocharis spp. Spikerush facw or greater
Eulalia viminea microstigium fac+
Eupatoriadulphus spp. Joe-pye weed fac or greater
flex opaca American holly fac
Impatiens capensis jewel weed facw
Juncus effuses soft rush facw+
Ligustrum sinence Chinese privet fac
Lindera benzion spice bush facw
Liquidambar styraciflua sweet gum fac+
Liriodendron tulipifera tulip poplar fac
Ludwigia spp. Box-seed obl
Nyssa sylvatica black gum fac
Platanus occidentalis sycamore facw-
Pluchea foetida stink-weed obl
Quercus phellos willow oak facw-
Salix nigra black willow obl
Sambucus canadense American elder facw-
Woodwardia areolata netted chain fern obl
*These species occur at the impact site and likely will regenerate
at the mitigation site as volunteers.
MITIGATION SITE:
The proposed pond will be excavated in non-wetland floodplain alluvium and to a limited
extent, within the toeslopes of the adjacent uplands. Impacts to jurisdictional channels are
required for the construction of the pond. The pond is to be constructed in accordance
with accepted stormwater pond design criteria. Portions of the proposed pond may be
excavated to depths below soil material. This will affect the amount of topsoil fill required
in those areas. The limits of these areas will not be fully known until they have been
excavated.
REFERENCE ECOSYSTEM:
The reference ecosystems are fresh water marsh and pond headwater areas types typical of
impoundments in the region. The reference ecosystems are suitable for illustrating
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regional native plant community reactions to saturation and inundation in a man made
feature. The reference ecosystems were selected based on their similarities with the design
concept and their proximity within the local Piedmont landscapes.
' MITIGATION GOALS:
1) A self-sustaining littoral wetland and aquatic plant community within a formerly
non-wetland site.
2) Functional value as associated with similar wetland communities.
3) Spatial extent commensurate with mitigation requirements and aesthetic value.
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SUCCESS CRITERIA:
Spatial success will be realized when 75% herbaceous coverage is attained within the
1 mitigation site and 75 % of woody wetland plants have survived for three years. The
+ herbaceous cover must be comprised of at least three of the introduced or volunteer
' species. The estimated schedule for achieving 75% coverage is by the third growing
season, however, the site will be monitored until success is achieved. Woody plant
survival is defined as the percent of material alive based on the planting spacing (i.e. 2' x
2'- forbes spp. and 6'x 6' -shrub spp.), or volunteers within that area. At least 50% of the
vegetation must be FACW or OBL.
If after the second growing season coverage is significantly lower than what is expected in
a normal progression necessary to reach 75% by the end of the third season (<1/3
coverage), a plan to rectify the situation will be prepared and submitted to the client and
DWQ within 30 days of inspection.
Functional success of the mitigation project will be assumed upon achievement of the
spatial criteria. Enhancement of bank stabilization, flow control, pollutant removal,
wildlife habitat, and educational and aesthetic aspects of the site may be assumed through
successful re-vegetation with wetland plants. Additionally, the functional value as a
dispersal corridor may be assumed once the plant community interfaces with adjacent
( native plant communities.
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COMPONENTS OF THE MITIGATION SITE:
Vegetation
Plant material will be added to the littoral bench after completion of grading and during
the next appropriate growing season. Proposed plant material is described in Appendix 1,
Planting Plans and Specifications . Plant material will be appropriate for a littoral edge
community. Volunteer plants will also invade the littoral edge over time from propagules
t in the existing and imported soil and from off-site sources (animals, inflowing water, wind,
etc.).
Soils
Soil in the reference ecosystem have been identified as the Wehadkee Soil Series by on-
site evaluation. Upon completion of rough grading, the mitigation site (littoral bench) will
be composed of existing alluvial soils, areas graded to non-soil, and fill material from the
i adjacent areas. Some areas will undoubtedly be unsuitable for planting due to poor
physical and fertility conditions. Some of the existing alluvial topsoil at the pond site
and/or the topsoil from the impacted wetland sites will be stockpiled for use where
' unsuitable areas result from grading. Where unsuitable material is encountered in the
mitigation area, the site will be over-excavated by 6" (0.5') and the stockpiled material
will be used to bring the littoral bench up to final grade during fine-grading. Soil
amendments are discussed in Appendix I, Planting; Plans and Specifications.
Hydrology
Hydrology (a saturated and inundated soil condition on the littoral bench soils) at the
mitigation site will be established after completion and filling of the stormwater pond.
Normal pool elevation will flood the littoral bench from 0" to 12" in depth. Normal pool
will be maintained by inflow from Stirrup Iron Creek and runoff from adjacent landscapes.
During storm events, water elevation will rise for short periods as the outlet device detains
the excess flow. The stormwater outflow will be regulated by a low flow device which
releases the excess water over time, preventing high peak flows downstream. Pollutant-
containing stormwater will be detained in the pond during that time and the detention
effect of the pond and the plant community of the littoral bench will act in combination to
reduce the pollutant load.
MITIGATION SEQUENCE:
Erosion Control-
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WETLAND MITIGATION PLAN
The pond installer will erect the appropriate erosion control devices in all necessary areas
so as to avoid excessive siltation within the construction area and shall be responsible for
securing all needed land clearing permits.
Pre-construction meeting-
Pre-construction / planting meeting with the installer, Client representative, designer
' (S&EC), and DWQ to review the plan and confirm the roles of all involved parties. A
log of this meeting will be appended to this plan (See Attachment 5: Pre-construction
Meeting Log or ...).
Pond Installation -
The stormwater detention pond will be constructed according to approved detention pond
design criteria. The littoral bench shall be constructed according to the grading plan and
soil criteria as described in the Components of the Mitigation Site section.
' Plantings-
Upon completion of grading, plant littoral bench with either stabilization plantings or, if
the season is appropriate, plant permanent plantings (spring - herbaceous marsh plants and
shrub/tree species or fall - shrub/tree species) per planting plans and specifications.
As-built Plan -
The designer will prepare a general as-built plan for the site after site preparation and
planting which shows relative elevations within site, establishes reference elevations, and
locates areas to be monitored during the evaluation period.
Project Evaluation -
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the following section.
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MONITORING AND MANAGEMENT:
' Tri Properties will be responsible for all financial aspects of the project and the long-term
maintenance of the mitigation site (after the fifth growing season). The installer and / or

' i designer will be responsible for reporting on and assisting with the monitoring,
maintenance, and management of this site until success criteria are met. Evaluation
reports drafted by the designer will be furnished to the clients, DWQ and COE. Reports
will contain data pertaining to percent herbaceous coverage and plant survival, and a

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WETLAND MITIGATION PLAN
{ narrative of management activities and general project condition. A final report will be
prepared upon the completion of the monitoring period or until success criteria are met.
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Should an unanticipated catastrophic event destroy the mitigation site within the
monitoring period a contingency plan will be drafted.
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Monitoring and evaluation of site will include:
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Site inspections, by S&EC and client, during the installation and monitoring of the
mitigation site to identify potential depredation and degradation sources, if any are
identified, a plan to rectify the problem(s) will be appended .
Final inspection after all site work is complete, preparation of appropriate
completion of work statement, preparation of a brief as-built report, sketch plan,
and documentary photos and submission of that report to DWQ for
' review within 60 days of completion.
Location of mitigation sites (planted material) such that it can be differentiated
I from native succession.
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i Site inspection early in first growing season.
Site inspection at end of first growing season and preparation of letter of
evaluation, documentary photos, and suggested treatment of any failed areas
and submission to DWQ within 30 days of inspection.
Site inspection during late growing season of second and third years with
documentary photos and letter of evaluation at end of third growing season (to
DWQ within 30 days of inspection).

Management and maintenance of the site will focus on establishment and protection of the
wetland and will consist of the following:
Removal of undesirable sprouting woody vegetation (by hand-taking rootstock if
' possible) within the systems. To be done in late August -
September of the-growing seasons.
Re-planting of any bare or sparse spots during season appropriate to plant species
as necessary to achieve success.

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WETLAND MITIGATION PLAN
Maintaining ground cover and sediment control devices on all up-slope uplands to
prevent sedimentation within the mitigation area.
Removal and control of any potentially degrading factors such as destructive
wildlife, humans, domestic animals, and debris.
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Appendix 1: Planting Plan and Specifications
The mitigation site will be planted with the appropriate species at the start of a growing
season. A preliminary listing of species is found below; additional species may be selected
after site preparation and site equilibrium and will be noted in the As-built Plan: Tri
Properties Mitigation Plan (Attachment 4:). If the season is not appropriate for
installation of permanent plantings, the site will be stabilized with a readily available
temporary cover (Appendix 4: Proposed Seed Mixture for Stabilization). The planting
plan is subject to change upon completion of site preparation, all changes will be noted in
subsequent reports and the as-built plans.
The site will be prepared accordingly and be planted as described below and with all
appropriate soil amendments.
Littoral Bench./ Marsh Areas:
Water Depth Range 0" - 12"
Juncus effusus
Typha angustifolia
Scirpus cyperinus
Pontederia cordata
Iris versicolor
Iris pseudocorus
Cephalanthus occidentalis
Taxodium distichum
Magnolia virginia
All marsh / emergent plants will be planted on a 2'x2' spacing. Shrub and tree species will
be planted on a 6'x6' spacing. Refer to accompanying sample planting plans for typical
arrangement.
Plant Material Specifications (Adapted from Garbisch, 1995)
Balled and Bagged CWoody Plants):
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The size of the earthen ball shall be at least as large as specified in the American Standard
for Nursery Stock (1980). Where plants are to be planted in soils that will be saturated
most of the growing season, the bagged root ball shall have a surface diameter that is at
least 1/2 the diameter of the un-pruned drip-line and a depth that is at least 8" per 5' of
i tree/shrub height.
If not planted immediately upon delivery to the job site, plants shall be stored in shade and
root balls kept moist through periodic watering until the time of planting.
If growing, the plants shall appear healthy with no leaf spots, leaf damage, leaf
f discoloration, chlorosis, leaf wilting or curling, or evidence of insects on the leaves.
Container (Woody and Herbaceous Plants):
The soil within the root ball shall be at field capacity (1/3 atmosphere) or wetter upon
delivery to the job site. Any wilted, dry and/or light weight plants shall be rejected. If not
f planted immediately upon delivery to the job site, plants shall be stored in shade and root
balls kept moist through periodic watering until the time of planting.
The container size shall be at least as large as specified. Plants shall not necessarily be
rejected when supplied in containers larger than specified. However, the soil/root masses
shall be the size of the specified container size. If the soil/root masses are substantially
smaller than the specified container size and loose soil exists on the sides and bottom of
the containers, indicating that plants have not been in specified containers long enough to
# root into surrounding soil, the plants shall be rejected.
If growing, the plants shall appear healthy with no leaf spots, leaf damage, leaf
discoloration, chlorosis, leaf wilting or curling, or evidence of insects on the leaves.
For trees and shrubs, where spiraling woody roots exist on the outside of the soil/root
mass upon the removal of the plants from the containers, the landscape contractor shall
separate (cutting where necessary) and spread them out (frazzle) prior to planting.
Fiber or Peat Pot (Herbaceous Plants):
If not planted immediately upon delivery to the job site, plants shall be stored in shade and
root masses kept moist through periodic watering until the time of planting.
The plants shall be well-rooted through the sides and bottoms of the pots and firmly
contained therein.
1 If the plants may be easily removed from the pots by holding the upper portion of the plant
and gently pulling on the pots, the plants shall be rejected.
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WETLAND MITIGATION PLAN
If growing, the plants shall appear healthy with no leaf spots, leaf damage, leaf
discoloration, chlorosis, leaf wilting or curling, or evidence of insects on the leaves.
The pot size shall be at least as large as specified. Plants shall not necessarily be rejected
when supplied in pots larger than specified.
The number of plants or stems (culms) per port as specified shall be present at the
minimum, and on the average, or the plants shall be rejected.
Dormant PropaQule (Herbaceous Plants):
If not planted immediately upon delivery to the job site, the dormant propagules shall be
stored out of direct exposure to the sun and wind and they shall be protected by covering
?j with straw, peat moss, compost, or other suitable materials and shall be kept moist,
through periodic watering, until the time of planting.
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The bodies and shoots associated with the propagules shall have turgor or be rigid to the
touch. If the bodies and/or shoots associated with the propagules are soft or mushy, or
appear rotten or decomposed, the plant materials shall be rejected. Rhizome (stolon)
' sections shall provide a minimum of two shoots per section. Or: Rhizome (stolon)
sections containing at least a terminal shoot shall be a minimum of four inches (4") in
length (in order to ensure sufficient stored energy to support the new growth). Rhizome
sections containing shoots that are soft or mushy or otherwise appear rotten shall not be
accepted.
Plug (Herbaceous Plants, Woody Seedlings, or Rooted Cuttings):
If not planted immediately upon delivery to the job site, the plugs whether in or out of
their growing units shall be stored out of direct exposure to the sun and wind and
maintained moist through periodic watering until the time of planting. If the plugs are not
contained in their growing units upon delivery and will not be planted immediately, they
should be treated as above and their root masses shall be protected by straw or other
suitable materials and maintained moist, through periodic watering, until planting time.
Plugs shall have solid soil/root masses with the soil in place. Roots shall appear clean and
white in coloration.
If growing, the plants shall appear healthy with no leaf spots, leaf damage, leaf
discoloration, chlorosis, leaf wilting or curling, or evidence of insects on the leaves.
If dormant (herbaceous), new healthy shoots shall be apparent. Plugs containing shoots
that are soft or mushy or otherwise a
ear rotten shall not be acce
ted
pp
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WETLAND MITIGATION PLAN
If dormant (woody), stems shall be pliable and exhibit light green to yellowish green
cambium. Plugs containing brittle stems and having unhealthy cambium shall not be
accepted.
Plugs (woody seedlings) shall have widths that are at least to the limb lines of the
seedlings and have depths that are at least one-fourth the heights of the seedlings.
Seed:
ti Shall be delivered in clean, unopened containers and labeled as to seed origin, purity,
germination percentage, and date of germination testing.
Fertilization
Herbaceous plantings:
Spring plantings - Use Osmocote 18-6-12, eight to nine month release fertilizer, to be
placed in hole at time of planting. For Dormant propagules, container/fiber pot, or plug
seedlings use about 15 grams (0.5 oz.) per planting.
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Woody plantings:
+ Fall/Winter plantings - Use Osmocote 18-5-11, twelve to fourteen month release fertilizer,
to be placed in hole or in soil fill/amendment mix at planting. Use 30 grams (1 oz.) per 1
` quart container, 90 grams (3 oz.) per 1 gallon container (30 grams per each additional
gallon). Use 15 grams (1 oz.) per un-rooted cutting for willow whips.
Soil Amendments:
Soil amendments are required only around tree and shrub plantings, with the exception of
significantly graded areas (where stockpiled wetland topsoil may be used). The
amendment used should be leaf or pine bark compost at rates of one part compost to one
part soil (from planting hole). Fertilizer should be mixed in with soil/amendment mix. No
surface mulch is required where plants are planted at or near original grade.

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Appendix 2: Proposed Potential Sources for Plant Material
(additional sources may be proposed prior to installation, for approval by DWQ).
Herbaceous material:
Campbell's Greenhouse Carlton Campbell/Larry Hobbs
2816 Campbell Road
Raleigh, NC. 27606 919-851-1162
(also has team of experienced installers)
Shrub Material:
Campbell's Greenhouse
2816 Campbell Road
Raleigh, NC. 27606
Carlton Campbell/Larry Hobbs
919-851-1162
Fern Valley Farms
1624 Fern Valley Road
Yadkinville, NC. 27055
NC Forest Service Nurseries
Raleigh, NC.
Specimen ornamental species:
Campbell's Greenhouse
2816 Campbell Road
Raleigh, NC. 27606
Tom Clark
910-463-2412
Carlton Campbell/Larry Hobbs
919-851-1162
Niche Gardens .
1111 Dawson Road
Chapel Hill, NC. 27516
Woody tree species:
NC Forest Service Nurseries
Raleigh, NC.
Kim Hawkes
919-967-0078
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Appendix 3: Proposed Seed Mixture for Stabilization
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Appendix 4: List of Plan Authors and References
REFERENCES:
Garbish et al., Environmental Concern Inc., 1995. 210 West Chew Avenue. St,
Michaels, Maryland 21663
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USACOE, Wetland Development and Restoration. 1993. Government Printing
Office. Washington, DC
PREPARED BY:
J. Michael Ortosky, Jr.
Licensed Soil Scientist
Soil and Environmental Consultants, Inc.
Christopher Huysman
Biologist and Wetland Scientist
Soil and Environmental Consultants, Inc.
Bob Zarzecki
Biologist
Soil and Environmental Consultants, Inc.
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Map 1: Site Vicinity Map
IMPERIAL CENTER
WETLAND MITIGATION PLAN
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Map I Mitigation Site Map
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Attachment 1: As-built Plans
To be attached upon completion.

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Attachment 2: Pre-construction Meeting Log for Imperial Center
Mitigation Designer's Representative Date
Client's Representative Date
Installer's Representative Date
Division of Water Quality Representative Date
NOTES:
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