SW8881202_Historical File_19940421

HOUSTON and ASSOCIATES, P.A.
Consulting Engineers
SHALLOTTE,NORTH CAROLINA 28459
Telephone[phone] STOFiflIATLi 4918 Main Street
Facsimile(910)754-2121 Post Office Box 2927
AECEOVED
APR 2 1 1994 Tuesday, April I9, I994
DEM
Ms. Linda Lewis 'toJ # $$LZUZ
NC Dept. of Environment, Health,
and Natural Resources
Division of Environmental Management
127 Cardinal Drive Extension
Wilmington, North Carolina 28405-3845 Names
APR p 11994
Subject: Brick Landing Plantation
Revised Stormwater Plan for Oakbrook III
DEM Project # 881202
Dear Ms. Lewis:
We have revised the subject stormwater plan to be in conformance with
the comments presented in your letter to us dated April 6, 1994. Following
is a summary of our revisions corresponding to the numbered comments
presented in your letter:
1. Depth check in 0 & M Plan
The "Stormwater Facilities Maintenance Plan" has been revised to
reflect depth check requirements.
2. Depth of runoff for Pond 3
The depth of runoff presented in the "Stormwater Data Summary" has
been corrected to reflect 1.0' rather than 2.0'.
3. Runoff contour for 1" runoff
All pond grading plans have been revised to illustrate the contour
representing the storage of runoff from 1" rainfall.
4. Surface areas provided at the 1" runoff elevation
The surface area provided at the 1" runoff elevation has been added for
each pond in the "Stormwater Data Summary".
We have also made an additional revision to Pond 2. The pond has been
shifted so that Lots 107 thru 110 are used rather than Lots 106 thru 109. All
other design characteristics of the pond remains unchanged.

Ms. Linda Lewis Page 2 Oakbrook III
April 19, 1994 Revised SW Plan
Three copies of the revised plans are enclosed for your review. Also
enclosed are three executed copies of the revised "Stormwater Facilities
Maintenance Plan". It is noted that Mr. Fleming Gibson is no longer with
Brick Landing Plantation; therefore, the maintenance plan has been executed
by another party. We have also included three copies of deed restrictions
executed by the new responsible party.
We trust that this letter and the enclosed documentation adequately
address all of your comments. Please give us a call if you have any additional
questions or concerns about our proposed revisions.
Sincerely,
Ja /� Houston, P.E.
Ho �•n and Associates, P.A.
JRH/dmc
Enclosures
pc: Mr. Charles Wells, Brick Landing Plantation
File; 93-0710S (Brick Landing Golf Course Sale)

Qa SINE a'
State of North Carolina -
Department of Environment, Health, and Natural Resources
Wilmington Regional Office
James B. Hunt, Jr., Governor DIVISION OF ENVIRONMENTAL MANAGEMENT Bob Jamieson
Jonathan-B. Howes, Secretary Regional Manager
April 6, 1994
Mr. Jay Houston, P.B.
Houston and Associates
Post Office Box 2927
Shallotte, North Carolina 28459
Subject: ADDITIONAL INFORMATION
Stormwater Project No. 881202
Oakbrook III
Brunswick County
Hd Dear Mruston:
The Wilmington Regional Office received a Stormwater Submittal for the Oakbrook III on
February 23, 1994. A preliminary review of that information has determined that the submittal for the
subject project is not complete. The following information is needed to continue the stormwater review:
1,\'*v/1. Please add a requirement to the Operation and Maintenance Plan that a depth check is
required every 6 months to determine the sediment accumulation. Removal is required at
when the permanent pool depth is reduced to 3'. A minimum 3' depth must be maintained
at all times.
Q,ti`�✓2. The depth of runoff for Pond 3 is reported on the plans as 2.0. I believe this should be
revised to 1.0'.
°l�/3�. The bottom, permanent pool, Q10, and Q1 elevations are noted, however the 1" runoff
"
contour has not been drawn on the plan.
a,ti\S\6 Please add the surface areas provided at the 1" runoff elevation to the summary of the
ponds on the plans.
127 Cardinal Drive Extension,Wilmington,N.C.28405-3845•Telephone [phone]•Fax [phone]
An Equal Opportunity Affirmative Action Employer

Mr. Houston
April 6, 1994
Stormwater Project No. 881202
Please note that this request for additional information is in response to a preliminary review. The
requested information should be received by this Office prior to May 6, 1994, or the submittal will be
returned as incomplete.
If you have any questions concerning this matter please feel free to call me at [phone].
Sincerely,
&de()
Ms. Linda Lewis
Environmental Engineer
DA/arl: S:\WQS\STORMWAT\ADDINFO\881202.APR
cc: (2) Linda Lewis
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HOUSTON and ASSOCIATES, P.A.
Consulting Engineers
SHALLOTFE,NORTH CAROLINA 28459
Telephone[phone] 4918 Main Street
Facsimile(910)754-2121 Post Office Box 2927
Wednesday, March 30, 1994
Ms. Linda Lewis S IUR1WjTEq
NC Dept. of Environment, Health,
and Natural Resources ilizgc4.e.TREgcNi
Division of Environmental Management
127 Cardinal Drive Extension MAR
Wilmington, North Carolina 28405-3845 ��9
Subject: Brick Landing Plantation
Revised Stormwater Plan for Oakbrook III
DEM Project # 881202
Dear Ms. Lewis:
We have revised the subject stormwater plan to be in conformance with
the comments presented in your letter to us dated March 4, 1994.
Following is a summary of our revisions corresponding to the numbered
comments presented in your letter:
1. Sealed calculations
Three sets of revised, sealed calculations are enclosed.
2. Side slopes of Pond # 3 at 3:1
The side slopes of Pond # 3 have been changed to 3:1.
3. Operation and Maintenance Plan
Three copies of a signed and notarized Operation and Maintenance
Plan are enclosed.
4. Submittal of revised plans
Three sets of revised plans are enclosed.
5. Signed and notarized deed restriction for 4,500 SP/Iot
Three copies of signed and notarized deed restrictions designating
4,500 SF/lot are enclosed.

Ms. Linda Lewis Page 2 Oakbrook III
March 30, 1994 Revised SW Plan
6. Deficient volume for stormwater storage at Pond # 2
The original routing calculations have been revised to reflect a
corrected normal pool elevation of 17.5' MSL, and a top of riser
elevation of 19.3' MSL. Enclosed are three copies of the revised
calculations.
7. Deficiency of surface area for Pond # 1
The normal pool elevation has been raised from 17.9' MSL to 18.9'
MSL to provide a surface area exceeding 10,000 SF. Accordingly,
the top of riser elevation has also been raised one foot, and there is
sufficient freeboard during the design rainfall events.
8. Outlet structure details
Outlet structure details have been added to the revised plans.
9. Highlighting of design storage contours
All design contours for the ponds have been highlighted on the plans
including: bottom, normal pool, top of riser, pool elevation at the
Q 10 peak rainfall, and pool elevation at the Q100 peak rainfall.
I0. Final design of Pond # 3
Design of Pond # 3 is now complete.
We trust that this letter and the enclosed documentation adequately
address all of your comments. Please give us a call if you have any additional
questions or concerns about our proposed revisions.
Sincerely,
e,
7 ��; 4A
070 ' Houston, P.E.
n and Associates, P.A.
JRH/dmc
Enclosures
pc: Mr. Fleming Gibson, Brick Landing Plantation
File; 93-0710S (Brick Landing Golf Course Sale)

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SUMMARY OF DIFFERENCES IN ORIGINAL PLAN VS. REVISED[) vC E V k
j)j
POND # Y MAR 3 1 1994
, D g,ita
FEATURE DESCRIPTION ORIGINAL PLAN REVISEDemw # Vo 1204-
TOTAL DRAINAGE BASIN AREA(ac.) 11.73 11.73 �04-'‘ �"}.-
TOTAL BUILT-UPON AREA(ac.) 2.23 3.2 4�tS$f�j�0,y+-."
TOTAL PERVIOUS AREA(ac.) 9.50 8.45 /
• COMPUtED RUNOFF 14,923 17,977 Ji - 4
FROM 1"RAINFALL(cf) 440 r- "`
SURFACE AREA OF POND 0.30 0.23
@ NORMAL POOL(ac.)
SW STORAGE DEPTH(ft.) 1.2 1.8
ELEVATION OF ORIFICE(ft.MSL) 17.9 18.9 (PYtvto w elev. I7•1,
DIAMETER OF ORIFICE(in.) 1.5 2.0
APPROX.TIME FOR DRAW DOWN(days) 4.0 2.8 (P yrv;ow-++�-_ 2,7)
BOTTOM ELEV.OF POND(ft.MSL) 13.9 14.9 01-,c v ro of (Zv/ 2 13.5,
RISER DIAMETER(in.) 36 36
ELEVATION OF RISER(ft.MSL) 19.1 20.7 (P-,-v .' e-fc--''•- 11.7,
BARREL DIAMETER(in.) 24 30
I.I.OF BARREL(ft.MSL) 16.2 18.0 (._►°rc l'r j1 ci av= 1),a)
I.O.OF BARREL(ft. MSL) 16.0 17.5 (P,-z.v i a v s e_fe v:= 1 6,S)
LENGTH OF BARREL(ft.) 30 50
VEGETATIVE SWALE YES YES
DOWNSTREAM OF POND?
10-YEAR PEAK Q(cfs) (unknown) 32
100-YEAR PEAK Q(cfs) (unknown) 48
POOL ELEVATION @ Q10(ft.MSL) (unknown) 21.6 (}P vi a,r r clay z 20,60
POOL ELEVATION @ Q100(ft. MSL) (unknown) 23.4 LR�v,,or die' = 22'0

SUMMARY OF DIFFERENCES IN ORIGINAL PLAN VS. REVISED PLAN
POND # 2
FEATURE DESCRIPTION ORIGINAL PLAN REVISED PLAN
TOTAL DRAINAGE BASIN AREA(ac.) 28.41 28.41
TOTAL BUILT-UPON AREA(ac.) 6.71 I0.06
TOTAL PERVIOUS AREA(ac.) 21.70 18.35
COMPUTED RUNOFF 39,954 49,648
FROM 1" RAINFALL(cf)
SURFACE AREA OF POND 0.51 0.65
n NORMAL POOL(ac.)
SW STORAGE DEPTH(ft.) 1.8 1
ELEVATION OF ORIFICE(ft. MSL) 16.9 17.5
DIAMETER OF ORIFICE(in.) 2.5 3.0
APPROX.TIME FOR DRAW DOWN(days) 3.2 3.4
BOTTOM ELEV. OF POND(ft. MSL) 12.9 13.5
RISER DIAMETER(in.) 48 48
ELEVATION OF RISER(ft. MSL) 18.8 19.3
BARREL DIAMETER(in.) 36 36
1.1. OF BARREL(ft. MSL) 16.9 17.0
I.O.OF BARREL(ft. MSL) 14.6 14.6
LENGTH OF BARREL(ft.) 615 615
VEGETATIVE SWALE YES YES
DOWNSTREAM OF POND?
10-YEAR PEAK Q(cfs) (unknown) 30
100-YEAR PEAK Q(cfs) (unknown) 38
POOL ELEVATION a,Q10 (ft. MSL) (unknown) 20.0
POOL ELEVATION a;Q100 (ft. MSL) (unknown) 21.1

SUMMARY OF DIFFERENCES IN ORIGINAL PLAN VS. REVISED PLAN
POND # 3
FEATURE DESCRIPTION ORIGINAL PLAN REVISED PLAN
TOTAL DRAINAGE BASIN AREA(ac.) 6.38 6.38
TOTAL BUILT-UPON AREA(ac.) 1.33 1.91
TOTAL PERVIOUS AREA(ac.) 5.05 4.47
COMPUTED RUNOFF 8.476 10.154
FROM 1"RAINFALL(cf)
SURFACE AREA OF POND 0.10 0.23
@ NORMAL POOL(ac.)
SW STORAGE DEPTH(ft.) 1.9 .279 1,0 4'7,1-c14- Ag-
4-ia-a4 I,
ELEVATION OF ORIFICE(ft. MSL) 12.5 14.0 56 a Assoc. le40,
DIAMETER OF ORIFICE(in.) 0.5 1.5
APPROX.TIME FOR DRAW DOWN(days) 4.2 3.6
BOTTOM ELEV. OF POND(ft. MSL) 8.5 11.0
RISER DIAMETER(in.) 36 30
ELEVATION OF RISER(ft. MSL) 14.4 15.0
BARREL DIAMETER(in.) (unknown) 24
1.1.OF BARREL(ft. MSL) (unknown) 13.6
1.0.OF BARREL(ft. MSL) 12.3 12.1
LENGTH OF BARREL(ft.) 20 150
VEGETATIVE SWALE YES NO*
DOWNSTREAM OF POND?
10-YEAR PEAK Q(cfs) (unknown) 1
100-YEAR PEAK Q(cfs) (unknown) 6
POOL ELEVATION(a;Q10(ft. MSL) (unknown) 15.1
POOL ELEVATION 4,Q100(ft. MSL) (unknown) 15.3
* SA and depth of pond designed for>90%TSS removal.

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SUBJECT Ravi t ed S 0 '' l,- r-
4iston and Associates, P.A. SHEET NO. OF
CONSULTING ENGINEERS CALCULATEDBYY'"C--
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Shallotte,North Carolina 28459 [phone] SCALE II
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2/I7/90
BRICK LANDING - OAKBROOK III SW POND # 1
DON COVIL 3/17/94
VOLUME OF RUNOFF FROM 1 INCH RAINFALL: 18000 CF
STORM WATER REALEASE METHOD: ORIIFICE
ELEVATION OF NORMAL POOL (BOTTOM OF ORIFICE) : 18.9 FT. MSL (Pr vs elev.' 0.5 4)
DIAMETER OF ORIFICE: 2 IN.
_SURFACE AREA OF POND AT NORMAL POOL: 10000 SQ. FT.
ELEVATION OF POOL AT DESIGN STORAGE: 20.7 FT. MSL 0.-cvioos erg. = 19.70
i:'IME INCREMENT FOR ROUTING: 2 HR.
]'IME ELEV. HEAD FLOWRATE TYPE FLOW VOLUME END ELEV
0 20.7 1.800001 . 1408633 ORIFICE 1014.216 20.59858
2 20.59858 1.69858 .1368373 ORIFICE 985.2282 20.50006
4 20.50006 1.600058 .1328095 ORIFICE 956.2285 20.40443
6 20.40443 1.504435 .1287799 ORIFICE 927.2151 20.31171
8 20. 31171 1.411713 .1247483 ORIFICE 898.1876 20.22189
10 20.22189 1.321894 .1207146 ORIFICE 869.1448 20.13498
12 20.13498 1.23498 .1166786 ORIFICE 840.0861 20.05097
14 20.05097 1.150971 .1126402 ORIFICE 811.0096 19.96987
16 19.96987 1.069868 .1085992 ORIFICE 781. 9141 19.89168
18 19.89168 .9916763 .1045554 ORIFICE 752.7988 19.8164
20 19.8164 .9163952 .1005085 ORIFICE 723 .6612 19.74403
22 19.74403 .8440285 9.645835E-02 ORIFICE 694.5001 19.67458
24 19.67458 .7745781 9.240469E-02 ORIFICE 665.3138 19 .60805
26 19.60805 .708046 8.834705E-02 ORIFICE 636.0988 19 .54444
28 19.54444 .6444359 8.428519E-02 ORIFICE 606.8533 19.48375
30 19.48375 .5837498 .8.021855E-02 ORIFICE 577.5736 19.42599
32 19.42599 .5259915 7.614662E-02 ORIFICE 548.2556 19. 37117
34 19.37117 .4711666 7 .206902E-02 ORIFICE 518.8969 19. 31928
36 19.31928 .4192772 6.798481E-02 ORIFICE 489.4907 19. 27033
38 19.27033 .3703289 6.389328E-02 ORIFICE 460.0316 19. 22433
40 19.22433 .3243256 5.979323E-02 ORIFICE 430.5113 19. 18128
42 19.18128 .2812748 5.568354E-02 ORIFICE 400.9215 19. 14118

44 19.14118 .2411823 5.156252E-02 ORIFICE 371.2502 19.10406
46 19.10406 .2040577 4.742833E-02 ORIFICE 341.484 19.06991
48 19.06991 .1699085 4. 327818E-02 ORIFICE 311.6029 19.03875
50 19.03875 .1387482 3.910884E-02 ORIFICE 281.5837 19.01059
52 19.01059 .11059 3.491558E-02 ORIFICE 251.3922 18.98545
54 18.98545 8.545112E-02 3 .069165E-02 ORIFICE 220.9799 18.96335
56 18.96335 6.335259E-02 2 .642674E-02 ORIFICE 190.2725 18.94433
58 18.94433 4.432488E-02 2.210473E-02 ORIFICE 159.154 18.92841
60 18.92841 .. 2.840996E-02 1.769688E-02 ORIFICE 127.4175 18.91567
62 18.91567 1.566887E-02 1.314257E-02 ORIFICE 94.62648 18.90621
64 18.90621 6.206513E-03 8.271518E-03 ORIFICE 59.55493 18.90025
66 18.90025 2.498627E-04 1.659633E-03 ORIFICE 11.94936 18.89906

BRICK LANDING - OAKBROOK III SW POND # 2 (e1-�_c-
DON COVIL 3/17/94
VOLUME OF RUNOFF FROM 1 INCH RAINFALL: 50000 CF
STORM WATER REALEASE METHOD: ORIFICE
ELEVATION OF NORMAL POOL (BOTTOM OF ORIFICE) : 17.5 FT. MSL
)IAMETER OF ORIFICE: 3 IN.
E;URFACE AREA OF POND AT NORMAL POOL: 28300 SQ. FT.
EELEVATION OF POOL AT DESIGN STORAGE: 19.3 FT. MSL G f ov, /B.7')
TIME INCREMENT FOR ROUTING: 2 HR.
PIME ELEV. HEAD FLOWRATE TYPE FLOW VOLUME END ELEV
0 19.3 1.799999 i.3169422 ORIFICE 2281.984 19. 21936
2 19.21936 1.719364 . 3097618 ORIFICE 2230.285 19.14056
4 19.14056 1.640556 .3025795 ORIFICE 2178.573 19.06358
6 19.06358 1.563576 .2953952 ORIFICE 2126.845 18.98842
8 18.98842 1.488422 .2882086 ORIFICE 2075.102 18.9151
10 18.9151 1.415096 .2810198 ORIFICE 2023.342 18.8436
12 18.8436 1.343599 .2738286 ORIFICE 1971.566 18.77393
14 18.77393 1.273933 .266635 ORIFICE 1919.772 18.7061
16 18.7061 1.206097 .2594388 ORIFICE 1867.959 18.64009
18 18.64009 1.140091 .2522398 ORIFICE 1816.127 18.57592
20 18.57592 1.075916 .2450378 ORIFICE 1764.272 18.51358
22 18.51358 1.013575 .2378328 ORIFICE 1712.396 18.45307
24 18.45307 .9530659 .2306245 ORIFICE 1660.496 18.39439
26 18.39439 .8943901 .2234124 ORIFICE 1608.57 18. 33755
28 18.33755 .8375511 .2161969 ORIFICE 1556.618 18.28255
30 18.28255 .782547 .2089773 ORIFICE 1504.637 18. 22938
32 18.22938 .7293796 .2017533 ORIFICE 1452.624 18.17805
34 18.17805 .678051 .1945248 ORIFICE 1400.579 18.12856
36 18.12856 .628561 . 1872913 ORIFICE 1348.498 18.08091
38 18.08091 .5809098 .1800521 ORIFICE 1296.375 18.0351
40 18.0351 .535101 .1728071 ORIFICE 1244.211 17 .99114
42 17.99114 .4911347 .1655557 ORIFICE 1192.001 17.94902

44 17.94902 .4490147 .1582975 ORIFICE 1139.742 17. 90874
46 17.90874 .408741 .1510317 ORIFICE 1087.428 17.87032
48 17.87032 .3703156 .1437573 ORIFICE 1035.052 17 .83374
50 17.83374 .3337402 .1364735 ORIFICE 982.6089 17.79902
52 17.79902 .2990189 .1291794 ORIFICE 930.0916 17.76615
54 17.76615 .2661533 .1218737 ORIFICE 877.4902 17.73515
56 17.73515 .2351456 .1145545 ORIFICE 824.7927 17.706
58 17 .706 .2060013 .1072207 ORIFICE 771.9893 17.67872
60 17.67872 .1787224 9. 986961E-02 ORIFICE 719.0612 17.65331
62 17.65331 .1533127 9.249812E-02 ORIFICE 665.9865 17.62978
64 17.62978 .1297798 8.510351E-02 ORIFICE 612.7453 17.60813
66 17.60813 .1081276 7.768053E-02 ORIFICE 559.2998 17.58836
68 17.58836 8.836365E-02 7.022321E-02 ORIFICE 505.6071 17.5705
70 17.5705 7.049751E-02 6.272357E-02 ORIFICE 451.6097 17.55454
72 17.55454 5.453873E-02 5.516917E-02 ORIFICE 397. 218 17.5405
74 17.5405 4.050255E-02 4.754284E-02 ORIFICE 342.3084 17.52841
76 17.52841 2.840614E-02 . 0398153 ORIFICE 286.6702 17.51828
78 17.51828 1.827622E-02 3 .193648E-02 ORIFICE 229.9427 17.51015
80 17.51015 1.015091E-02 2. 380107E-02 ORIFICE 171. 3677 17.5041
82 17.5041 4.095078E-03 1.511732E-02 ORIFICE 108.84'47 17.50025
84 17.50025 2.479553E-04 3 .719895E-03 .ORIFICE 26.78324 17.4993

BRICK LANDING - .OAKBROOK III SW,POND # 3
DON COVIL 2/17/94
LUME OF RUNOFF FROM 1 INCH RAINFALL: 10200 . CF
,'EVATION OF NORMAL POOL (BOTTOM OF ORIFICE) : 14 FT. MSL
RFACE AREA OF POND AT NORMAL POOL: 10000 SQ. FT.
,EVATION OF POOL AT DESIGN STORAGE: 15 FT. MSL
METER OF ORIFICE: 1.5 IN.
ME INCREMENT FOR ROUTING: 2 HR.
:ME ELEV. HEAD FLOWRATE VOLUME END ELEV
15 1 5.905869E-02 425.2226 14.95748
14.95748 .9574776 5.778941E-02 416.0838 14.91587
14.91587 .9158688 5.651979E-02 406.9425 14.87518
i 14.87518 .8751745 5.524987E-02 397.7991 14.83539
3 14.83539 .8353939 5.397959E-02 388.6531 14.79653
LO 14.79653 .7965288 5.270899E-02 379.5047 14.75858
L2 14.75858 .7585783 5.143801E-02 370.3537 14.72154
L4 14.72154 .7215424 5.016662E-02 361.1996 14.68542
16 14.68542 .685422 4.889483E-02 352.0428 14.65022
3.8 14.65022 .6502171 .0476226 342.8827 14.61593
20 14.61593 .6159286 4.634993E-02 333.7195 14.58256
22 14.58256 .5825568 .0450768 324.5529 14.5501
24 14.5501 .5501013 4.380314E-02 315.3826 14.51856
26 14.51856 .5185623 4.252892E-02 306.2082 14.48794
28 14.48794 .4879418 4.125418E-02 297.0301 14.45824
30 14.45824 .4582386 .0399788 287.8473 14.42945
32 14.42945 .4294539 3.870278E-02 278.66 14.40159
34 14.40159 .4015875 3.742605E-02 269.4675 14.37464
36 14.37464 .3746405 3.614858E-02 260.2698 14.34861
38 14.34861 .3486138 3.487034E-02 251.0665 14.32351
40 14.32351 .3235073 3.359123E-02 241.8569 14.29932
42 14.29932 .2993212 3.231117E-02 232.6404 14.27606

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1 14.27606 .2760573 3.103012E-0.2 223.4169 14.25372
5 14.25372 .2537155 2.974798E-02 214.1855 14.2323
3 14.2323 .232297 2.846464E-02 204.9454 14.2118
) 14.2118 .2118025 .02718 195.696 14.19223
14.19223 .1922331 2.589393E-02 186.4363 14.17359
14.17359 .1735897 2.460628E-02 177.1652 14.15587
5 14.15587 .1558733 2.331684E-02 167.8813 14.13909
8 14.13909 .1390848 .0220254 158.5828 14.12323
O 14.12323 .1232262 2.073173E-02 149.2684 14.1083
2 14.1083 .1082993 1.943554E-02 139.9359 14.09431
4 14.09431 9.430504E-02 1.813641E-02 130.5822 14.08125
6 14.08125 8.124638E-02 1.683395E-02 121.2044 14.06913
3 14.06913 6.912613E-02 1.552762E-02 111.7989 14.05795
0) 14.05795 5.794621E-02 1.421662E-02 102.3597 14.04771
2 14.04771 4.771042E-02 1.290003E-02 92.88018 14.03842
4 14.03842 3.8.42259E-02 .0115765 83.35078 14.03009
0 14.03009 3.008747E-0.2 1.024417E-02 73.75802 14.02271
8 14.02271 2.271176E-02 8.900394E-03 64.08284 14.0163
O 14.0163 1.630306E-02 7.540819E-03 54.29389 14.01087
2 14.01087 .0108738 6.158493E-03 44.34115 14.00644
4 14.00644 6.439209E-03 4.739147E-03 34.12186 14.00303
6 14.00303 3.026962E-03 3.249282E-03 23.39483 14.00069
8 14.00069 6.875992E-04 1.548644E-03 11.15024 13.99957

( 1ev►se_.-, S//7/q44
, !='ROJECT I .D. - OAKBROOK III SW POND # 1 100 - YEAR PEAK Q
DESIGN FLOWRATE = 48 CFS
RISER DIAMETER 3 FT.
RISER ELEVATION 20.7 FT. ( P,-,,;00f ck, = 19,-21)
CULVERT DIAMETER. . . 2.5 FT.
CULVERT LENGTH 50 FT.
INVERT-IN 18 FT. (Pvvroos elev. . I74) ')
INVERT-OUT 17.5 FT. /6.S '
TAILWATER ELEVATION. . . -A- FT. (c4 i--ry 4-- c-t w 1.<-1.-r)
COMPUTED WATER SURFACE ELEVATION BASED ON:
'INLET CONTROL 23 .37852 FT.
OUTLET CONTROL 22.40142 FT. '?"-) ow
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WEIR FLOW 21.87514 FT. ( l•5
HIGHEST ELEVATION COMPUTED IS THE ACCEPTED ELEVATION.
PROJECT I.D. - OAKBROOK III SW POND # 1 10 - YEAR PEAK Q
DESIGN FLOWRATE = 32 CFS
RISER DIAMETER. . . . 3 FT.
RISER ELEVATION. . . 20.7 FT.
CULVERT DIAMETER. . . 2.5 FT.
CULVERT LENGTH. . . . 50 FT.
INVERT-IN. . . . . . . . . 18 FT.
INVERT-OUT 17.5 FT.
TAILWATER ELEVATION. . . 19.5 FT.
COMPUTED WATER SURFACE ELEVATION BASED ON:
INLET CONTROL 21.0849 FT.
OUTLET CONTROL 21.01174 FT.
WEIR FLOW 21.59679 FT.
HIGHEST ELEVATION COMPUTED IS THE ACCEPTED ELEVATION.
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:)JECT I.D. - OAKBROOK III SW POND # 2 10-YEAR PEAK Q
[)ESIGN FLOWRATE = 30 CFS
RISER DIAMETER 4 FT.
RISER ELEVATION 19.3 FT.
CULVERT DIAMETER. . . 3 FT.
CULVERT LENGTH 615 FT.
INVERT-IN 17 FT.
INVERT-OUT 14.6 FT.
TAILWATER ELEVATION. . . 16.6 FT.
COMPUTED WATER SURFACE ELEVATION BASED ON:
INLET CONTROL 19.27773 FT.
OUTLET CONTROL 18.67797 FT.
WEIR FLOW 20.0091 FT.
HIGHEST ELEVATION COMPUTED IS THE ACCEPTED ELEVATION.
:OJECT I.D. - OAKBROOK III SW POND # 2 100-YEAR PEAK Q
DESIGN FLOWRATE = 38 CFS
RISER DIAMETER. . . . 4 FT.
RISER ELEVATION. . . 19.3 FT.
CULVERT DIAMETER. . . 3 FT.
CULVERT LENGTH. . . . 615 FT.
INVERT-IN 17 FT.
INVERT-OUT 14.6 FT.
TAILWATER ELEVATION. . . 16.6 FT.
COMPUTED WATER SURFACE ELEVATION BASED ON:
INLET CONTROL 19.74783 FT.
OUTLET CONTROL 21.10445 FT.
WEIR FLOW 20 .13014 FT.
HIGHEST ELEVATION COMPUTED IS THE ACCEPTED ELEVATION.

[)JECT I.D. - OAKBROOK III SW POND # 3 10 - YEAR PEAK Q
DESIGN FLOWRATE = 1 CFS
RISER DIAMETER 2.5 FT.
RISER ELEVATION 15 FT.
CULVERT DIAMETER. . . 2 FT.
CULVERT LENGTH 150 FT.
:INVERT-IN 13.6 FT.
INVERT-OUT 12.1 FT.
TAILWATER ELEVATION. . . 14.1 FT.
COMPUTED WATER SURFACE ELEVATION BASED ON:
INLET CONTROL 14.60438 FT.
OUTLET CONTROL 14.10627 FT.
WEIR FLOW 15.10046 FT.
HIGHEST ELEVATION COMPUTED IS THE ACCEPTED ELEVATION.
:OJECT I.D. - OAKBROOK III SW POND # 3
DESIGN FLOWRATE = 6 CFS
RISER DIAMETER. . . . 2.5 FT.
RISER ELEVATION. . . 15 FT.
CULVERT DIAMETER. . . 2 FT.
CULVERT LENGTH. . . . 150 FT.
INVERT-IN 13.6 FT.
INVERT-OUT 12.1 FT.
TAILWATER ELEVATION. . . 14.1 FT.
COMPUTED WATER SURFACE ELEVATION BASED ON:
INLET CONTROL 14.75749 FT.
OUTLET CONTROL 14.32565 FT.
WEIR FLOW 15.33174 FT.
HIGHEST ELEVATION COMPUTED IS THE ACCEPTED ELEVATION.

dSTATEa
Itt
State of North Carolina
Department of Environment, Health, and Natural Resources
Wilmington Regional Office
James B. Hunt, Jr., Governor DIVISION OF ENVIRONMENTAL MANAGEMENT Bob Jamieson
Jonathan B. Howes, Secretary Regional Manager
March 4, 1994
Mr. Don Covil, P.S.
Houston and Associates
Post Office Box 2927
Shallotte, North Carolina 28459
Subject: ADDITIONAL INFORMATION
Stormwater Project No. 881202
Brick Landing-Oakbrook III
Brunswick County
Dear M eCovil:
The Wilmington Regional Office received a Stormwater Submittal for the Brick Landing-Oakbrook
III on February 23, 1994. A preliminary review of that information has determined that the submittal
for the subject project is not complete. The following information is needed to continue the stormwater
review:
V 1. North Carolina registered Professional Engineers seal on the calculations.
/2. Please change the side slopes above the permanent pool elevation of Pond 3 to 3:1. Ponds
1 and 2 were originally approved with 2:1 slopes and since space is at a premium for those
ponds they may stay that way. This Office will inspect for side slope stabilization.
¢�k k 3. Please provide a signed and notarized Operation and Maintenance Plan for the stormwater
chi`rs%` ¢hSeP controls. My old file only has a statement of responsibility signed by H. Michael Brazeal.
a I assume that the project has changed ownership, therefore an 0&M plan must be created
,(Qt 7 signed by the new responsible party for maintenance. Please stress the side slope
maintenance issue because of the 2:1 slope for Ponds 1 and 2.
i 4. Please send a total of three sets of plans or revision to plans.
/5. A signed and notarized deed restriction for 4,500 square feet per lot.
127 Cardinal Drive Extension,Wilmington,N.C.28405-3845•Telephone [phone] a Fax [phone]
An Equal Opportunity Affirmative Action Employer

Mr. Covil
March 4, 1994
Stormwater Project No. 881202
6. We had determined that Pond 2's permanent pool elevation should be 17.5, however, this
equates to a deficient volume. You have calculated the storage available based on a
permanent pool of 16.9. You may need to revise either the 1" storage elevation or the
permanent pool in order to get the required volume.
7. The permanent pool surface area for Pond 1 does not planimeter out at 10,000 square feet.
I keep getting between 9,400 and 9,600 square feet. This difference does not affect the
required surface area, nor the volume for Pond 1. Please make sure the contours reflect
the proposed provided surface area.
/ 8. Please provide revised outlet structure details. I consider the proposed changes in water
elevations, riser elevations and orifice sizes justification enough to provide new details.
I have copied the original details from the plans and enclose them for your convenience.
O 9. In the same manner that you have highlighted the permanent pool contour,please hightlight
the design storage contours for all ponds.
10. Per your request, I will not review Pond 3 until the final design is complete.
Please note that this request for additional information is in response to a preliminary review. The
requested information should be received by this Office prior to April 4, 1994, or the submittal will be
returned as incomplete.
If you have any questions concerning this matter please feel free to call me at [phone].
Sincerely,
Ge(A.icteu
Ms. Linda Lewis
Environmental Engineer
DA/arl: S:IWQS\STORMWAT\ADDINFO1881202.MAR
cc: (2) Linda Lewis
Central Files
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biffsi.ide imp?rvibus .3529 e . 9

HOUSTON and ASSOCIATES, P.A.
Consulting Engineers
SHALLOTTE,NORTH CAROLINA 28459
Telephone[phone] 4918 Main Street
Facsimile(910)754-2121 Post Office Box 2927
Monday, February 21, 1994
Ms. Linda Lewis 0 ,,_*
it
NC Dept. of Environment, Health,
and
Natural Resources
Division of Environmental Management
127 Cardinal Drive Extension /4, W4 v tt 4:y
Wilmington, North Carolina 28405-3845 ••**"
`es �••.
Subject: Brick Landing Plantation /47
Revised Stormwater Plan for Oakbrook III
DEM Project # 881202
Dear Ms. Lewis:
The Stormwater Plan permitted under DEM Project # 881202 for the
subject project allows 2,500 SF per lot built-upon area. Brick Landing
Plantation recently retained Houston and Associates to revise the Plan to
increase the allowable built-upon area per lot. The enclosed documentation
supports the increase from 2,500 SF/lot to 4,500 SF/lot.
Included in this submittal are two sets each of the following:
- plans illustrating the revised pond layouts, elevations, and other
features;
- calculations addressing new stormwater runoff volumes, new pond
stormwater storage volumes, peak flow hydrology, peak flow
hydraulics, etc.;
- summary sheets for each pond presenting the differences between
the original stormwater submittal and the current submittal.
The stormwater collection system for Oakbrook III is already in-place.
The new plans do not call for any changes to the collection system except in
the area of Pond # 3. We have redesigned the entrance road, and minor
changes have been made to accommodate the new roadway alignment.
We are also not proposing any changes to the type outlet structures;
therefore, we have not provided any details addressing them. There are,
however, changes in the size of riser, barrel diameter, invert and top of riser
elevations, size of orifices, and/or elevation of orifices.

Ms. Linda Lewis Page 2 Oakbrook III
February 21, 1994 Revised SW Plan
We trust that you will find our submittal is sufficient to allow the
increase in built-upon area per lot as proposed. At such time as this
allowance is made, Brick Landing Plantation will revise the Heed Restrictions
and Protective Covenants accordingly.
Your attention to this matter is appreciated. Please give us a call if you
have any questions or concerns about our proposed revisions.
Sincerely,
a,,Peir
ji .
" Houston, P.E.
ton and Associates, P.A.
JRH/dmc
Enclosures
pc: Mr. Fleming Gibson, Brick Landing Plantation
File; 93-0710S (Brick Landing Golf Course Sale)

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ORIGINAL SUBMITTAL(SF) H&A SUBMITTAL ORIGINAL SUBMITTAL H&A SUBMITTAL
I AREA# (#LOTS) PER LOT LOT•TOTAL STREETS OFF-SITE TOTAL (#LOTS)PER LOT LOTTOTAL STREETS OFF-SITE TOTAL LAWNS,d OFF-SITE TOTAL LAWNS,etc,OFF-SITE TOTAL
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12 73/ 2500/ 182500/ MOO/ 11000/ 292300 73 4500 328500 98800 11000 438300 _ 756727 188615 945342 610727 188615 799342
3 12 2500 30000 19800 8320 58120 11 4500 49500 25560 8320 83380 175000 45000 220000 149740 45000 194740
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CONSULTING ENGINEERS CALCULATEDB DATF 2,?/94c
4918 Main Street Post Office Box 2927 CHECKED BY DATE
Shallotte, North Carolina 28459 [phone] SCALE
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Houston and Associates, P.A.P.A.. SHEET N0. OF 1
CONSULTING ENGINEERS CALCULATED BY DATF 2f IL�QtF
4918 Main Street Post Office Box 2927 CHECKED BY DATF
Shallotte, North Carolina 28459 [phone] SCALE '
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4918 Main Street Post Office Box 2927 CHECKED BY DATE
Shallotte, North Carolina 28459 [phone] SCALE
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SHEE1 NO. OF
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Shallotte, North Carolina 28459 [phone] SCALE
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Houston and Associates, P.A. SHEET No. OF
CONSULTING ENGINEERS CALCULATED BY DATF 2//7/9ig-
4918 Main Street Post Office Box 2927 CHECKED BY DATE
Shallotte, North Carolina 28459 (919)I754-6324 SCALE •
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SUBJECT-6;f;tr.. F/deJ-Reg.di'vt -7 ..r..4*. Z
Houston and Associates, P.A.
SHEET NO. OF
CONSULTING ENGINEERS CALCULATED BY Gm-r-- DATE 2//7/94'-
4918 Main Street Post Office Box 2927 CHECKED BY DATE
Shallotte, North Carolina 28459 [phone] SCALE • .
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BRICK LANDING - OAKBROOK III SW POND # 1
DON COVIL 2/3/94
VOLUME OF RUNOFF FROM 1 INCH RAINFALL: 18000 CF
ELEVATION OF NORMAL POOL (BOTTOM OF ORIFICE) : 17.9 FT. MSL
SURFACE AREA OF POND AT NORMAL POOL: 10000 SQ. FT.
ELEVATION OF POOL AT DESIGN STORAGE: 19.7 FT. MSL
DIAMETER. OF ORIFICE: 2 IN.
TIME INCREMENT FOR ROUTING: 2 HR.
TIME .•ELEV. HEAD FLOWRATE VOLUME END ELEV
0 19.7. 1.800001 .1408633 1014.216 19.59858
2 19.59858 1.69858 .1368373 985.2282 19.50006.
4 19.50006 1.600058 .1328095 956.2285 19.40443
6 19.40443 1.504435 .1287799 927.2151 19.31171
8 19. 31171 1.411713 .1247483 898.1876 19.22189
10 19.22189 1.321894 .1207146 869.1448 19.13498
12 19.13498 1.23498 .1166786 840.0861 19.05097
14 19.05097 1.150971 .1126402 811.0096 18.96987
16 18.96987 1.069868 .1085992 781.9141 18.89168
18 18.89168 .9916763 .1045554 752.7988 18.8164
20 18.8164 .9163952 .1005085 723.6612 18.74403
22 18.74403 .8440285 9.645835E-02 694.5001 18.67458
24 18.67458 .7745781 9.240469E-02 665.3138 18.60805
26 18.60805 .708046 8.834705E-02 636.0988 18.54444
28 18.54444 .6444359 8.428519E-02 606.8533 18.48375
30 18.48375 .5837498 8.021855E-02 577.5736 18.42599
32 18.42599 .5259915 7.614662E-02 548.2556 18.37117
34 18.37117 .4711666 7.206902E-02 518.8969 18.31928
36 18.31928 .4192772 6.798481E=02 489.4907 18.27033
38 18.27033 .3703289 6.389328E-02 460.0316 18.22433
40 18.22433 .3243256 5.979323E-02 430.5113 18.18128
42 18.18128 .2812748 5.568354E-02 400.9215 18.14118

-FOND # I
44 18.14118 .2411823 5.156252E-02 371.2502 18.10406
46 18.10406 .2040577 4.742833E-02 341.484 18.06991
48 18.06991 .1699085 4.327818E-02 311.6029 18.03875
50 18.03875 .1387482 3.910884E-02 281.5837 18.01059
52 18.01059 .11059 3.491558E-02 251.3922 17.98545
54 17.98545 8.545112E-02 3.069165E-02 220.9799 17.96335
56 17.96335 6.335259E-02 2.642674E-02 190.2725 17.94433
58 17.94433 4.432488E-02 2.210473E-02 159.154 17.92841
60 17.92841 2.840996E-02 1.769688E-02 127.4175 17.91567
62 17.91567 1.566887E-02 1.314257E-02 94.62648 17.90621
64 17.90621 6.206513E-03 8.271518E-03 59.55493 17.90025
66 17.90025 2.498627E-04 1.659633E-03 11.94936 17.89906

BRICK LANDING - OAKBROOK III SW POND• # 2
DON COVIL 2/3/94
JOLUME OF RUNOFF FROM 1 INCH RAINFALL: 50000 C r�77
FILEVATION OF NORMAL POOL (BOTTOM OF ORIFICE) : .9 FT. MSL I. S Cyl S
SURFACE AREA OF POND AT NORMAL POOL: 28300 SQ. f
ELEVATION OF POOL AT DESIGN STORAGE: 18.7 FT. MSL
DIAMETER OF ORIFICE: 3 IN.
PINE INCREMENT FOR ROUTING: 2 HR.
rIME ELEV. HEAD FLOWRATE VOLUME END ELEV
0 18.7 1.800001 .3169424 2281.985 18.61937
2 18.61937 1.719366 .309762 2230.286 18.54056
4 18.54056 1.640558 .3025796 2178.573 18.46358
6 18.46358 1.563578 .2953954 2126.847 18.38842
8 18.38842 1.488424 .2882088 2075.104 18.3151
10 18.3151 1.415098 .2810199 2023.344 18.2436
12 18.2436 1.343601 .2738288 1971.567 18.17394
14 18.17394 1.273935 .2666352 1919.774 18.1061
16 18.1061 1.206099 .259439 1867.961 18.04009
18 18.04009 1.140093 .25224 1816.128 17.97592
20 17.97592 1.075918 .245038 1764.274 17.91358
22 17.91358 1.013577 .2378331 1712.398 17.85307
24 17.85307 .9530678 .2306247 1660.498 17.79439
26 17.79439 .894392 . 2234127 1608.572 17.73755
28 17.73755 .8375511 .2161969 1556.618 17.68255
30 17.68255 .782547 .2089773 1504.637 17.62938
32 17.62938 .7293796 .2017533 1452.624 17.57805
34 17.57805 .6780491 .1945246 1400.577 17.52856
36 17.52856 .6285591 .187291 1348.495 17.48091
38 17.48091 .5809078 .1800518 1296.373 17.4351
40 17.4351 .535099 .1728069 1244.209 17.39113
42 17.39113 .4911328 .1655554 1191.999 17.34901

TOND 2
44 17.34901 .4490128 .1582972 1139.74 17.30874
46 17.30874 .4087391 .1510313 1087.425 17.27031
48 17.27031 .3703137 .1437569 1035.05 17.23374
50 17.23374 .3337383 .1364731 982.606 17.19902
52 17.19902 .299017 .129179 930.0886 17.16615
54 17.16615 .2661514 .1218732 877.4872 17.13514
56 17.13514 .2351437 .1145541 824.7893 17.106
58 17.106 .2059994 .1072203 771.9858 17.07872
60 17.07872 .1787205 9.986908E-02 719.0574 17.05331
62 17.05331 .1533108 9.249755E-02 665.9824 17.02978
64 17.02978 .1297779 8.510289E-02 612.7408 17.00813
66 17.00813 .1081257 7.767985E-02 559.2949 16.98836
68 16.98836 8.836174E-02 7.022245E-02 505.6017 16.9705
70 16.9705 7.049561E-02 6.272272E-02 451.6036 16.95454
72 16.95454 5.453682E-02 .0551682 397.211 16.9405
74 16.9405 4.050064E-02 4.754172E-02 342.3004 16.92841
76 16.92841 2 840614E-02 .0398153 286.6702 16.91828
78 16.91828 1.827622E-02 3.193648E-02 229.9427 16.91015
80 16.91015 1.015091E-02 2.380107E-02 171.3677 16.9041
82 16 .9041 4.095078E-03 1.511732E-02 108.8447 16.90025
84 16.90025 2.498627E-04 3 .734174E-03 26.88606 16.8993

BRICK LANDING - OAKBROOK III SW POND # 3-
DON COVIL 2/17/94
VOLUME OF RUNOFF FROM 1 INCH RAINFALL: 10200 CF
ELEVATION OF NORMAL POOL (BOTTOM OF ORIFICE) : 14 FT. MSL
SURFACE AREA OF POND AT NORMAL POOL: 10000 SQ. FT.
ELEVATION OF POOL AT DESIGN STORAGE: 15 FT. MSL
DIAMETER OF ORIFICE: 1.5 IN.
TIME INCREMENT FOR ROUTING: 2 HR.
TIME ELEV. HEAD FLOWRATE VOLUME END ELEV
0 15 1 5.905869E-02 425.2226 14.95748
2 14.95748 .9574776 5.778941E-02 416.0838 14.91587
4 14.91587 .9158688 5.651979E-02 406.9425 14.87518
6 14.87518 .8751745 5.524987E-02 397.7991 14.83539
8 14.83539 .8353939 5.397959E-02 388.6531 14.79653
10 14.79653 .7965288 5.270899E-02 379.5047 14.75858
12 14.75858 .7585783 5.143801E-02 370.3537 14.72154
14 14.72154 .7215424 5.016662E-02 361.1996 14.68542
16 14.68542 .685422 4.889483E-02 352.0428 14.65022
18 14.65022 .6502171 .0476226 342.8827 14.61593
20 14.61593 .6159286 4.634993E-02 333.7195 14.58256
22 14.58256 .5825568 .0450768 324.5529 14.5501
24 14.5501 .5501013 4.380314E-02 315.3826 14.51856
26 14.51856 .5185623 4.252892E-02 306.2082 14.48794
28 14.48794 .4879418 4.125418E-02 297.0301 14.45824
30 14.45824 .4582386 .0399788 287.8473 14.42945
32 14.42945 .4294539 3.870278E-02 278.66 14.40159
34 14.40159 .4015875 3.742605E-02 269.4675 14.37464
36 14.37464 .3746405 3.614858E-02 260.2698 14.34861
38 14.34861 .3486138 3.487034E-02 251.0665 14.32351
40 14.32351 .3235073 3.359123E-02 241.8569 14. 29932
42 14.29932 .2993212 3.231117E-02 232.6404 14.27606

o HD # f
44 14.27606 •.2760573 3.103012E-02 223.4169 14.25372
46 14.25372 .2537155 2.974798E-02 214.1855 14.2323
48 14.2323 . 232297 2.846464E-02 204.9454 14.2118
50 14.2118 .2118025 .02718 195.696 14.19223
52 14.19223 .1922331 2.589393E-02 186.4363 14.17359
54 14.17359 .1735897 2.460628E-02 177.1652 14.15587
56 14.15587 .1558733 2.331684E-02 167.8813 14.13909
58 14.13909 .1390848 .0220254 158.5828 14.12323
60 14.12323 .1232262 2.073173E-02 149.2684 14.1083
62 14.1083 .1082993 1.943554E-02 139.9359 14.09431
64 14.09431 9.430504E-02 1.813641E-02 130.5822 14.08125
66 14.08125 8.124638E-02 1.683395E-02 121.2044 14.06913
68 14.06913 6.912613E-02 1.552762E-02 111.7989 14.05795
70 14.05795 5.794621E-02 1.421662E-02 102.3597 14.04771
72 14.04771 4.771042E-02 1.290003E-02 92.88018 14.03842
74 14.03842 3.842259E-02 .0115765 83.35078 14.03009
76 14.03009 3.008747E-0.2 1.024417E-02 73.75802 14.02271
78 14.02271 2.271176E-02 8.900394E-03 64.08284 14.0163
80 14.0163 1.630306E-02 7.540819E-03 54.29389 14.01087
82 14.01087 .0108738 6.158493E-03 44.34115 14.00644
84 14.00644 6.439209E-03 4.739147E-03 34.12186 14.00303
86 14.00303 3.026962E-03 3.249282E-03 23.39483 14.00069
88 14.00069 6.875992E-04 1.548644E-03 11.15024 13.99957

PROJECT I.D. — OAKBROOK III SW POND # 1 10—YEAR PEAK Q
DESIGN FLOWRATE = 32 CFS
RISER DIAMETER 2 FT.
RISER ELEVATION 19.7 FT.
CULVERT DIAMETER. . . 2 FT.
CULVERT LENGTH 50 FT.
INVERT—IN 17 FT.
INVERT—OUT 16.5 FT.
TAILWATER ELEVATION. . . 18.5 FT.
COMPUTED WATER SURFACE ELEVATION BASED ON:
INLET CONTROL 22.47974 FT.
OUTLET CONTROL 22.25223 FT. 0 k . �=2€E[7o.4c J 2
WEIR FLOW 20.87514 FT� CAe c k /Ov- YEA., . Q
• HIGHEST ELEVATION COMPUTED IS THE ACCEPTED ELEVATION.
PROJECT I.D. — OAKBROOK III SW POND # 1 100—YEAR PEAK Q
DESIGN FLOWRATE = 48 CFS
RISER DIAMETER. . . . 2 FT.
RISER ELEVATION. . . 19.7 FT.
CULVERT DIAMETER. . . 2 FT.
CULVERT LENGTH. . . . 50 FT.
INVERT—IN 17 FT.
INVERT—OUT 16.5 FT.
TAILWATER ELEVATION. . . 18.5 FT.
COMPUTED WATER SURFACE ELEVATION BASED ON:
INLET CONTROL. . . . . . . . . . . . . . 28.0794 FT. �
OUTLET CONTROL 26.94253 F 2 ' $4RZ -reo L1-7,4LL
WEIR FLOW 21.23989 FINS Fox Q,o„
HIGHEST ELEVATION COMPUTED IS THE ACCEPTED NORATION.
C4' vse e,4-.6vjc".c7 -fed/�0-. 0
bee-• , ;1,1-0 -f- CIie k
fo _re a- w kd - t;

PROJECT I.D. - OAKBROOK III SW POND = 100 - YEAR PEAK Q
DESIGN FLOWRATE = 48 CFS
RISER DIAMETER 3 FT.
RISER ELEVATION 19.7 FT.
CULVERT DIAMETER. . . 2.5 FT.
CULVERT LENGTH. .- 50 FT.
INVERT-IN 17 FT.
INVERT-OUT 16.5 FT.
TAILWATER ELEVATION. . . 18.5 FT.
COMPUTED WATER SURFACE ELEVATION BASED ON:
INLET CONTROL 22.37852 FT.Z
OUTLET CONTROL 21.90142 FT. )
WEIR FLOW 20.87514 FT.c
HIGHEST ELEVATION COMPUTED IS THE ACCEPTED ELEVATION.
PROJECT I.D. - OAKBROOK III SW POND # 1 10 - YEAR PEAK Q
DESIGN FLOWRATE = 32 CFS
RISER DIAMETER. . . . 3 FT.
RISER ELEVATION. . . 19.7 FT.
CULVERT DIAMETER. . . 2.5 FT.
CULVERT LENGTH. . . . 50 FT.
INVERT-IN 17 FT.
INVERT-OUT 16.5 FT.
TAILWATER ELEVATION. . . 18.5 FT.
COMPUTED WATER SURFACE ELEVATION BASED ON:
INLET CONTROL - 20.0849 FT.
OUTLET CONTROL 20.01174 FT.
WEIR FLOW 20.59679 FT.
HIGHEST ELEVATION COMPUTED IS THE ACCEPTED ELEVATION.
6-ActC OJT 3d CuLVEe 7 P/PE o'- _?‘ ,.LLdJJ 2 W'
CvL vel2 'r * Pis- /F Em&go/' Y e—/lsTrecicr� L..

?ROJECT I.D. - OAKBROOK III SW POND # 2 10-YEAR PEAK Q
DESIGN FLOWRATE = 30 CFS
RISER DIAMETER 4 FT.
RISER ELEVATION 19.3 FT.
CULVERT DIAMETER. . . 3 FT.
CULVERT LENGTH 615 FT.
INVERT-IN 17 FT.
INVERT-OUT 14.6 FT.
TAILWATER ELEVATION. . . 16.6 FT.
COMPUTED WATER SURFACE ELEVATION BASED ON:
INLET CONTROL 19.27773 FT.
OUTLET CONTROL 18.67797 FT.
WEIR FLOW 20.0091 FT.
HIGHEST ELEVATION COMPUTED IS THE ACCEPTED ELEVATION.
PROJECT I.D. - OAKBROOK III SW POND # 2 100-YEAR PEAK Q
DESIGN FLOWRATE = 38 CFS
RISER DIAMETER. . . . 4 FT.
RISER ELEVATION. . . 19. 3 FT.
CULVERT DIAMETER. . . 3 FT.
CULVERT LENGTH. . . . 615 FT.
INVERT-IN 17 FT.
INVERT-OUT 14.6 FT.
TAILWATER ELEVATION. . . 16.6 FT.
COMPUTED WATER SURFACE ELEVATION BASED ON:
INLET CONTROL. 19.74783 FT.
OUTLET CONTROL 21.10445 FT.
WEIR FLOW 20.13014 FT.
HIGHEST ELEVATION COMPUTED IS THE ACCEPTED ELEVATION.

PROJECT I.D. - OAKBROOK III SW POND # 3 10 - YEAR PEAK Q
DESIGN FLOWRATE = 1 CFS
RISER DIAMETER 2.5 FT.
RISER ELEVATION 15 FT.
CULVERT DIAMETER. . . 2 FT.
CULVERT LENGTH 150 FT.
INVERT-IN 13.6 FT.
INVERT-OUT 12.1 FT.
TAILWATER ELEVATION. . . 14.1 FT.
COMPUTED WATER SURFACE ELEVATION BASED ON:
INLET CONTROL 14.60438 FT.
OUTLET CONTROL 14.10627 FT.
WEIR FLOW 15.10046 FT.
HIGHEST ELEVATION COMPUTED IS THE ACCEPTED ELEVATION.
PROJECT I.D. - OAKBROOK III SW POND # 3
DESIGN FLOWRATE = 6 CFS
RISER DIAMETER. . . . 2.5 FT.
RISER ELEVATION. . . 15 FT.
CULVERT DIAMETER. . . 2 FT.
CULVERT. LENGTH. . . . 150 FT.
INVERT-IN 13.6 FT.
INVERT-OUT 12.1 FT.
TAILWATER ELEVATION. . . 14.1 FT.
COMPUTED WATER SURFACE ELEVATION BASED ON:
INLET CONTROL 14.75749 FT.
OUTLET CONTROL 14.32565 FT.
WEIR FLOW 15.33174 FT.
HIGHEST ELEVATION COMPUTED IS THE ACCEPTED ELEVATION.

i
.
SUMMARY OF DIFFERENCES IN ORIGINAL PLAN VS.REVISED PLA1,4„,,
POND # 1 .:� ^�
eP
FEATURE DESCRIPTION ORIGINAL PLAN REVISED PLAN
ja,TOTAL DRAINAGE BASIN AREA(ac.) C..11.73 ✓ 11.73
TOTAL BUILT-UPON AREA(ac.) 2.23✓ 3.28
TOTAL PERVIOUS AREA(ac.) 9.50 8.45
COMPUTED RUNOFF 14 3 17,977
FROM 1"RAINFALL(ct)
SURFACE AREA OF POND \ 0.30 0.23
@ NORMAL POOL(ac.)
SW STORAGE DEPTH(ft.) 1.2 1.8
FI FVATION OF ORIFICE(ft. MSL) 17.9 17.9
DIAMETER OF ORIFICE(in.) 1.5 2.0
APPROX.TIME FOR DRAW DOWN(days) 4.0 2.7
BOTTOM ELEV.OF POND(ft.MSL) 13.9 13.9
RISER DIAMETER(in.) 36 36
ELEVATION OF RISER(ft.MSL) 19.1 19.7 S TORA1 WA
BARREL DIAMETER in. 24 30 TE
I.I.OF BARREL(ft.MSL) 16.2 17.0 LLJ `r' li I II U i-
v .
JU
I.O.OF BARREL(ft.MSL) 16.0 16.5 FEB 2 3 1994
LENGTH OF BARREL(ft.) 30 50 D E M
•VEGETATIVE SWALE YES YES O� ag(202-
DOWNSTREAM OF POND? reV 5t'0r1
10-YEAR PEAK Q(cfs) (unknown) 32
100-YEAR PEAK Q(cfs) (unknown) 48
POOL ELEVATION @ Q10(ft.MSL) (unknown) 20.6
POOL ELEVATION @ Q100(ft.MSL) (unknown) 22.4

' SUMMARY OF DIFFERENCES IN ORIGINAL PLAN VS. REVISED PLAN
POND # 2
FEATURE DESCRIPTION ORIGINAL PLAN REVISED PLAN
TOTAL DRAINAGE BASIN AREA(ac.) 28.41 28.41
TOTAL BUILT-UPON AREA(ac.) 6.71 10.06
TOTAL PERVIOUS AREA(ac.) 21.70 18.35
COMPUTED RUNOFF 39,954 49,648
FROM 1"RAINFALL(cf)
SURFACE AREA OF POND 0.51 0.65
@ NORMAL POOL(ac.)
SW STORAGE DEPTH(ft.) 1.8 1.8
ELEVATION OF ORIFICE(ft.MSL) 16.9 17.5
DIAMETER OF ORIFICE(in.) 2.5 3.0
APPROX.TIME FOR DRAW DOWN(days) 3.2
BOTTOM ELEV.OF POND(ft.MSL) 12.9 I STORMWATER
RISER DIAMETER(in.) 48 48 tile
e u II U !DJ
ELEVATION OF RISER(ft.MSL) 19.3
18.8 1J ll
FEB 2 3 1994
BARREL DIAMETER(in.) 36 36 D E M
I.I. OF BARREL(ft.MSL) 16.9 17.0 OI
I.O.OF BARREL(ft.MSL) 14.6 14.6
LENGTH OF BARREL(ft.) 615 615
VEGETATIVE SWALE YES YES
DOWNSTREAM OF POND?
10-YEAR PEAK Q(cfs) (unknown) 30
100-YEAR PEAK Q(cfs) (unknown) 38
POOL FLF,VATION @ Q10(ft.MSL) (unknown) 20.0
POOL ELEVATION @ Q100(ft.MSL) (unknown) 21.1

SUMMARY OF DIFFERENCES IN ORIGINAL PLAN VS. REVISED PLAN
POND # 3
FEATURE DESCRIPTION ORIGINAL PLAN J EVISED PLAN
TOTAL DRAINAGE BASIN AREA(ac.) 6.38 6.38
TOTAL BUILT-UPON AREA(ac.) 1.33 1.91
TOTAL PERVIOUS AREA(ac.) 5.05 4.47
COMPUTED RUNOFF 8,476 10,154
FROM 1"RAINFALL(cf)
SURFACE AREA OF POND 0.10 0.23
Q NORMAL POOL(ac.)
SW STORAGE DEPTH(ft.) 1.9 2.0
ELEVATION OF ORIFICE(ft.MSL) 12.5 14.0
DIAMETER OF ORIFICE(in.) 0.5 1.5
APPROX.TIME FOR DRAW DOWN(days) 4.2 3.6
BOTTOM ELEV.OF POND(ft.MSL) 8.5 11.0
RISER DIAMETER(in.) 36 30
ELEVATION OF RISER(ft.MSL) 14.4 15.0
BARREL.DIAMETER(in.) (unknown) T TER
I.I.OF BARREL(ft.MSL) (unknown) 13.
I.O.OF BARREL(ft.MSL) 12.3 12.1 U l; d lr, v
I f
LENGTH OF BARREL ft 20
( ) 150
FEB 2 3 1994
VEGETATIVE SWALE YES NO* D E M
DOWNSTREAM OF POND? a f)
10-YEAR PEAK Q(cfs) (unknown) 1
100-YEAR PEAK Q(cfs) (unknown) 6
POOL ELEVATION @ Q10(ft.MSL) (unknown) 15.1
POOL ELEVATION @ Q100(ft.MSL) (unknown) 15.3
*SA and depth of pond designed for>90%TSS removal.

HOUSTON and ASSOCIATES, P.A.
Consulting Engineers
SHALLOTTE,NORTH CAROLINA 28459
Telephone[phone] 4918 Main Street
Facsimile(919)754-2121 Post Office Box 2927
Monday, January ?5, 1993
Mr. Dave Adkins, Water Quality Supervisor RECEIVED
Wilmington Regional Office
Division of Environmental Management ; IA J 27 1993
127 Cardinal Drive Extension
Wilmington, North Carolina 28405-3845
Wilmington Regional Office
DEM
Subject: Bricklanding Plantation
Fairwinds Townhomes (formerly Fairway 14 Villas)
Oakbrook III Subdivision
Stormwater Certification
Dear Mr. Adkins:
As a result of my telephone conversation with Ms. Linda Lewis of your
office, this letter is written to serve as a status report on the subject projects.
This letter is in response to your letters, dated December 28, 1992,
requesting stormwater certification.
The current owner of Bricklanding Plantation is preparing to convey a
major portion of the property to another entity. Prior to the conveyance of
the property, the owners desire to complete any outstanding items, in the
way of permits and/or certifications.
We have reviewed your letters of request and have advised Bricklanding
Plantation that there are apparently some stormwater features missing in the
field from the approved plans. We have requested copies of approved plans
so that we can advise our clients of the best method for proceeding.
We request that you allow us a thirty-day period to evaluate the current
status of the project, with respect to the completion of required
construction items, and to -develop a plan for complying with existing
stormwater rules. Should you have any questions or comments, please do not
hesitate in calling-our office and we will be happy to respond immediately.
Lr4ii S' cerely,
iv l� l� L� � 1i �
UU
FEB 0 1 1993 �
D 44 Houston, P.E.
of n aos. f -ton and Associates, P.A.
cc: Mr. Fleming Gibson, Bricklanding Plantation
Files; 89-0710R (Bricklanding Plantation - Oakbrook III)
89-0710R (Bricklanding Plantation - Fairwinds)