HomeMy WebLinkAbout20081348 Ver 1_More Info Received_20081006Mitchell Environmental, P.A.
U.? b's - 13 4%
October 3, 2008
Mrs. Lia M. Gilleski, Mr. Joseph Gyamfi & Amy Chapman
US DWQ - 401 WQC Unit
2321 Crabtree Boulevard, Suite 250
Raleigh, North Carolina 27604
Re: Cedar Chest Subdivision (Wake County - Neuse River Basin)
Request for more information
Dear Mrs. Gilleski, Mr. Gyamfi & Ms. Chapman,
k[IgNMAN
OCT 6 2008
DENR - WATER QUALITY
WETLANDS AND STORMWATER BRANCH
There were two requests made for additional information for the Cedar Chest project. Joseph
suggested that everything be submitted together for simplicity on today (10/3/2008). Below are
details regarding each request.
First request (9/26/2008)
a. A new full sized drainage map has been printed because I believe the one we submitted
was not clear enough. This is map 6 of 8.
b. A new map full sized map has been printed with all the contours shown. It is map 6 of 8.
c. Attached are the level spreader supplement forms and all corresponding attachments.
Second request (9/29/2008)
1. Minor variance:
a. See new map provided - # 3
b. See new map provided - # 3
c. We will be doing on-site mitigation. This will be accomplished by restoration
credits on the side slopes of the graded area of the proposed road. See map # 2
d. There will be no temporary impacts.
2. 401 Application items:
a. A new full sized map has been printed. This is map 7 of 8.
b. A new map is provided - map # 1
Please feel free to call me if you have any questions or concerns regarding the attached PCN
application or if you need any additional information. Thank you.
Sincerely,
6?&_D 1?5
Robin Eddy
PO Box 341 Fuquay-Varina, North Carolina 27526
Office: 919-557-4682 Fax: 919-557-4683
NCDENR
IN A+.7?F,q
Q?l `qY
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STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely filled out, printed and submitted.
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)!
I. PROJECT INFORMATION
Project name Cedar Chest
Contact name Carl Simmons
Phone number 919-833-0830
Date September 23, 2008
Drainage area number Area 3
11. DESIGN INFORMATION
For Level Spreaders Receiving Flow From a BMP
Type of BMP Underground Dry Detention
Drawdown flow from the BMP 3.09 cis
For Level Spreaders Receiving Flow from the Drainage Area Do not complete this section of the worksheet.
Drainage area ftz Do not complete this section of the worksheet.
Impervious surface area ft2 Do not complete this section of the worksheet.
Percent impervious % Do not complete this section of the worksheet.
Rational C coefficient Do not complete this section of the worksheet.
Peak flow from the 1 in/hr storm cfs Do not complete this section of the worksheet.
Time of concentration min
Rainfall intensity, 10-yr storm in/hr Do not complete this section of the worksheet.
Peak flow from the 10-yr storm cfs Do not complete this section of the worksheet.
Where Does the Level Spreader Discharge?
To a grassed bioretention cell? N (Y or N)
To a mulched bioretention cell? N (Y or N)
To a wetland? N (Y or N)
To a filter strip or riparian buffer? Y (Y or N) Please complete filter strip characterization below.
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass 70.00 ft
Width of dense ground cover ft
Width of wooded vegetation ft
Total width 70.00 ft
Elevation at downslope base of level lip 282.50 fmsl
Elevation at top of bank of the receiving water 276.00 fmsl
Slope (from level lip to to top of bank) 9.29 % Level spreaders must be placed in series.
Are any draws present? N (Y or N) OK
Level Spreader Design
Forebay surface area sq ft No forebay is needed.
Feet of level lip needed per cfs 13 f tcfs
Answer "Y" to one of the following:
Length based on the 1 in/hr storm? N (Y or N)
Length based on the 10-yr storm? Y (Y or N)
Length based on the BMP discharge rate? Y (Y or N)
Design flow 3.09 cis
Is a bypass device provided? N (Y or N) A bypass device is not needed.
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Parts t. and It. Design Summary, page 1 of 2
Length of the level lip
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
y
Peak velocity in the channel during the 10-yr storm
Channel lining material
50.00 it
N (Y or N)
#VALUE!
(Y or N) Do not complete this section of the worksheet.
(Y or N) Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet,
ft Do not complete this section of the worksheet.
it Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
cfs Do not complete this section of the worksheet
Do not complete this section of the worksheet
f W t
i
t Y t
?--------- ?
M
M
1 B 1
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Parts I. and If. Design Summary, page 2 of 2
Ill. REQUIRED ITEMS CHECKLIST
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Page/ Plan
Initials Sheet No.
1. Plans (1" - 50' or larger) of the entire site showing:
- Design at ultimate build-out,
- Off-site drainage (if applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
- Forebay (if applicable);
- Nigh flow bypass system,
- Maintenance access,
- Proposed drainage easement and public right of way (ROW), and
- Boundaries of drainage easement.
'=- 2. Plan details (1° = 30' or larger) for the level spreader showing:
Forebay (if applicable);
High flow bypass system,
One foot topo lines between the level lip and top of stream bank,
- Proposed drainage easement, and
Design at ultimate build-out.
?L 3. Section view of the level spreader (1 20' or larger) showing:
Underdrain system (if applicable),
Level lip,
- Upslope channel, and
- Dovmslope filter fabric,
tom- 4. A date-stamped photograph of the filter strip that clearly shows the type of vegetation that is present.
1c.? 5. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
_ 6. The supporting calculations.
7. A copy of the signed and notarized operation and maintenance (0&M) agreement.
8. A copy of the deed restrictions (if required).
Form SW401-Level Spreader. Filter Strip. Restored Riparian Buffer-Rev-5 Part Ili. page 1 of 1
Brookridge
Runoff Calc
Q10 Flow I „m
LAND USE C
BUSINESS:
DOWNTOWN AREAS 0.7-0.95
NEIGHBORHOOD AREAS 0.5-0.7
RESIDENTIAL:
SINGLE FAMILY AREAS
0.3-0.5
MULTI UNITS, DETACHED 0.4.0.6
MULTI UNITS, ATTACHED OS-075
SUBURBAN
INDUSTRIAL: 0.25-0.4
LIGHT AREAS 0.5-0.8
HEAVY AREAS 0.8-0.9
PARKS, CEMETARIES 0.1-0.25
PLAYGROUNDS 0.2-0.35
RAILROAD YARD AREAS 0.2-0.4
UNIMPROVED AREAS 0.1-0.3
STREETS:
ASPHALT 0.7-0.95
CONCRETE 0.8-0.95
BRICK 0.7-0.85
DRIVES AND WALKS 0.75-0.8:
ROOFS 0.75-0.8;
LAWNS:
SANDY SOIL, FLAT, 2% 0.05-0.1
SANDY SOIL, AVE., 2-7% 0.1-0.15
SANDY SOIL, STEEP, 7% 0.15-0.2
HEAVY SOIL, FLAT, 2% 0.13-0.17
HEAVY SOIL, AVE., 2-7% 0.18-0.2:
HEAVY SOIL, STEEP, 7% 0.25.0.31
AORICULTURAL LAND:
BARE PACKED SOIL
SMOOTH 0.3-0.8
ROUGH 02-0.5
CULTIVATED ROWS
HEAVY SOIL NO CROP 0.3-0,8
HEAVY SOIL WITH CROP 0.2-0.5
SANDY SOIL NO CROP 0.2-0.4
SANDY SOIL WITH CROP 0.1-0.25
PASTURE
HEAVY SOIL 0.150.4:
SANDY SOIL 0.05-02
WOODLANDS O.D5-02
Revised 11/112006 TGH
0.2 LAND USE C
0.52 BUSINESS:
1 DOWNTOWN AREAS 0.7-0.95
0.29 NEIGHBORHOOD AREAS 0.5-0.7
0.95 RESIDENTIAL:
SINGLE FAMILY AREAS 0.3-0.5
MULTI UNITS, DETACHED 0.4-0.6
0.464 MULTI UNITS, ATTACHED 0.6-0.75
4.51 SUBURBAN 0.25-0.4
5.76 INDUSTRIAL:
5.022 LIGHT AREAS 0.5-0.8
6.4 HEAVY AREAS 0.6-0.9
PARKS, CEMETARIES 0.1-0.25
PLAYGROUNDS 0.2-0.35
RAILROAD YARD AREAS 0.2-0.4
UNIMPROVED AREAS 0.1-0.3
STREETS:
ASPHALT 0.7-0.95
CONCRETE 0.8-0.95
BRICK 0.7-0.85
DRIVES AND WALKS 0.75-0.85
ROOFS 0.75-0.85
LAWNS:
SANDY SOIL, FLAT, 2% 0.05-0.1
SANDY SOIL, AVE., 2-7% 0.1-0.15
SANDY SOIL, STEEP, 7% 0.15-0.2
HEAVY SOIL, FLAT, 2% 0.13-0.17
HEAVY SOIL, AVE., 2-7% 0.18-0.22
HEAVY SOIL, STEEP, 7% 0.25-0.35
AGRICULTURAL LAND:
BARE PACKED SOIL
SMOOTH 0.3-0.6
ROUGH 0.2-0.5
CULTIVATED ROWS
HEAVY SOIL NO CROP 0.3-0.6
HEAVY SOIL WITH CROP 0.2-0.5
SANDY SOIL NO CROP 0.2-0.4
SANDY SOIL WITH CROP 0.1-0.25
PASTURE
HEAVY SOIL 0.15-0.4:
SANDY SOIL 0.05-0.2!
WOODLANDS 0.05-0.2:
TGH
Brookfid0e
Runoff Cale
Revised 111112006 TGH
Brookrid0e
Runoff Cale
Solving for Time of Concentration
Kinematic Wave Theory
RUNOFF COEFFICIENT
LAND US C
BUSINESS:
DOWNTOWN AREAS 0.7-0.95
NEIGHBORHOOD AREAS 0.5-0.7
RESIDENTIAL:
SINGLE FAMILY AREAS 0.3-0.5
MULTI UNITS, DETACHED 0.4-0.6
MULTI UNITS, ATTACHED 0.6-0.75
SUBURBAN 0.25-0.4
INDUSTRIAL:
LIGHT AREAS 0.5-0.8
HEAVY AREAS 0.8-0.9
PARKS, CEMETARIES 0.1-0.25
PLAYGROUNDS 02-0.35
RAILROAD YARD AREAS 0.2-0.4
UNIMPROVED AREAS 0.1-0.3
STREETS:
ASPHALT 0.7-0.95
CONCRETE 0.8-0.95
BRICK 0.7-0.85
DRIVES AND WALKS 0.75.0.85
ROOFS 0.75-0.85
LAWNS:
SANDY SOIL, FLAT, 2% 0.05-0.1
SANDY SOIL, AVE., 2-7% 0.1-0.15
SANDY SOIL, STEEP, 7% 0.15-0.2
HEAVY SOIL, FLAT, 2% 0.13.0.17
HEAVY SOIL, AVE., 2-7% 0.18-0.22
HEAVY SOIL, STEEP, 7% 0.25-0.35
AGRICULTURAL LAND:
BARE PACKED SOIL
SMOOTH 0.3-0.6
ROUGH 0.2-0.5
CULTIVATED ROWS
HEAVY SOIL NO CROP 0.3-0.6
HEAVY SOIL WITH CROP 0.2-0.5
SANDY SOIL NO CROP 0.2-0.4
SANDY SOIL WITH CROP 0.1-025
PASTURE
HEAVY SOIL 0.15-0.45
SANDY SOIL 0.05-0.25
WOODLANDS 0.05-0.25
Len h of overland flow 100.000 feet Surface Marini as n
Manni s "n" for surfac e 0
.240 Smooth Surface 0.011
Avera a watershed slo e .
0080 ft./ff. Fallow 0.050
Constant el ha 1.756 Cultivated <= 20% R esidue 0.060
Constant m 1.867 Cultivated,>20%Res idue 0.170
Weighted Runoff Coefficient 0.3990991 1 Grass Short 0.150
Grass, Dense 0140
Grass, Bermuda 0.410
Woods, Light 0.400
Woods, Dense 0.800
Composite "C" Factor
Cedar Chest Area 1
Existng condtion
Type of Cover Area SF Area AC "C factor Area*C
Bldg 0.00 1 0.00
Drives 0.00 0.95 0.00
Lawn 11, 372.00 0.26 0.2 0.05
0.05
Total Drainage Area
Composite "C"
Composite "C" Factor
Cedar Chesst
Existing Condition
11, 372.00 0.26
Area 2
0.20
Type of Cover Area SF Area AC "C" factor Area*C
Ex. Bldg 3318 0.08 1 0.08
Ex. Drives 8191 0.19 0.95 0.18
Bldg 0.00 1 0.00
Road 0.00 0.95 0.00
Sidewalk 0.00 0.95 0.00
Lawn 92,960.00 2.13 0.2 0.43
0.68
Total Drainage Area
Composite "C"
Composite "C" Factor
Cedar Chesst
Existing Condition
104,469.00 2.40
Area 3
0.28
Total CA
Type of Cover Area SF Area AC "C factor Area*C
Ex. Bldg 5026 0.115 1 0.12
Ex. Drives 1371 0.031 0.95 0.03
Bldg 0.00 1 0.00
.
Road 0.00 0.95 0.00
Sidewalk 0.00 0.00 0.95 0.00
Lawn 90,949.00 2.068 0.2 0.42
0.56
Total CA
Total Drainage Area 97,346.00 2.23
Composite "C" 0.25
Composite "C" Factor
Cedar Chest Area 1
Existing
Type of Cover Area SF Area AC "C" factor Area*C
Bldg 4,000.00 0.09 1 0.09
Drives 0.00 0.95 0.00
Lawn 7,372.00 0.17 0.2 0.03
0.13
Total Drainage) 11,372.00 0.26
Composite "C" 0.48
Composite "C" Factor
Cedar Chesst Area 2
Proposed Conditions
Type of Cover Area SF Area AC "C" factor Area*C
Ex. Bldg 2648 0.06 1 0.06
Ex. Drives 1027 0.02 0.95 0.02
Bldg 20,000.00 0.46 1 0.46
Road 9,171.00 0.21 0.95 0.20
Sidewalk 2,516.00 0.06 0.95 0.05
Lawn 69,107.00 1.59 0.2 0.32
1.11
Total Drainage) 104,469.00 2.40
Composite "C" 0.46
Composite "C" Factor
Cedar Chesst Area 3
Proposed Conditions
Type of Cover Area SF Area AC "C" factor Area*C
Ex. Bldg 4356 0.10 1 0.10
Ex. Drives 980 0.02 0.95 0.02
Bldg 15,000.00 0.34 1 0.34
Road 4,550.00 0.10 0.95 0.10
Sidewalk 0.00 0.00 0.95 0.00
Lawn 72,460.00 1.66 0.2 0.33
0.90
Total CA
Total CA
Total Drainage) 97,346.00 2.23
Composite "C" 0.40
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NCDENR Stormwater BMP Manual
8.4. Construction
Revised 09-28-07
Immediately before the level spreader is constructed, verify that ground contours are
parallel to the level spreader location called for in the plans, slopes are less than 6 to 8
percent, and that no draws are located in the filter strip adjacent to the level spreader. If
this is the case, the level spreader may need to be relocated to a more appropriate area.
Also verify in the field that the level spreader is fully 50 feet away from the stream if it is
being installed in an area covered by a Riparian Area Protection Rule.
Before construction, reassess the vegetation in the filter strip. The filter strip should be
densely vegetated prior to the construction of the level spreader. If not, additional
plantings will need to be added prior to the construction of the level spreader. If grass
cover needs to be re-established in the filter strip (only allowed within Zone 2 of a
protected riparian buffer), construction may be limited to the growing season.
The most important construction task is to insure that the level spreader is actually level.
A correctly installed level spreader will have no greater than 0.05% grade on the
spreader lip to ensure a uniform distribution of flow; otherwise water will channelize
below the structure and become a source of erosion. Level spreaders should be
constructed on undisturbed soil whenever possible. If the use of fill is unavoidable, it
shall be constructed on material compacted to 95% of standard proctor test levels prior
to seeding for that area not considered the seedbed.
The level spreader and filter strip must be protected from harm (e.g., sediment and
stormwater flows) during construction. A temporary stormwater diversion will likely
be necessary until the level spreader has fully stabilized. If the disturbed areas are
minor, they often can be stabilized with vegetative measures.
8.5. Maintenance
8.5.1. Common Maintenance Issues
During the first one or two years after construction, filter strips and level spreaders
should be inspected for proper distribution of flows and signs of erosion during and
after major storm events. After the first one or two years, the strip may be inspected
annually or biannually. If evidence of erosion exists, the eroded areas should be filled in
and reseeded. The cause of the erosion should then be determined and, if possible,
eliminated.
Filter strips that are not maintained properly may quickly become nonfunctional
(Schueler et al., 1992). Maintenance involves routine activities such as mowing,
trimming, and replanting when necessary. Strips that receive excessive sediment may
require periodic regrading and reseeding of their upslope edge because deposited
sediment can kill grass and change the elevation of the edge such that the stormwater no
longer flows through the strip in thin sheets. Maintenance requirements are as follows:
Level Spreader 8-11 July 2007
i
a.
Tyn i
211,
Location of Level Spreader on Lots 6/7
Location of Level Spreader on Lot 1
Lot 8
Note: All stormwater will be
collected by roof cutter system to
curb and gutter on the downslope
side of the driveway. From there it
will run into the inlet box on the
downslope of the driveway to the
proposed stormwater system.
There are no proposed temporary
impacts. All impacts will be
permanent.
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P.O. Box 341 Rde*, NC 27604 RALEIGH, NC - WAKE COUNTY
FUQUAY YARINA
NC 27526 '
,
OFFICE:
919-557-4682 DATE: Oct 3, zoos m 40
SCAM 1
MINOR
FAX: 919--559557'- -46683 85 SON- SCIENIST CONTACT.
DELINEATION
NEUSE RIP ARIAN ZONES 1 & 2
www.l[4tohedEEn??rbranmenta?.com. SCOTT MITCHELL PE, ISS
ump
Buffer Mitigation will be
done by Restoration credits.
Below displays the area on
either side of the proposed
road which will be restored. '
The large area is 2704 sq.
ft and smaller is 329.
Total is 3,033 sq. ft. The
amount requested was
2,850 sq. ft.
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329 sq. ft.
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2704 sq. ft
?_ xITCHELI BNVIRONMENTAL. P-4. PRPARW FOR. 702 Obedin Rood, Suite 410 CEDAR CHEST
P. o. Box 341 Rdekjh, NC 27604 RALEIGH, NC - WAKE COUNTY
FUQUAY MARINA, NC 27526 DATE Oct 3, 2006 SCALE. 1' = 40'
OFFICE: 919-557-4882
FAX: 9 f 9-557-4883 SOIL SCIENTIST CONTACT: MITIGATION - RESTORUTION CREDIT AVAILABLE
wvnu.H teheUEnvnronmentaLoorn SCOTT MITCHELL, PE, LSS vP # 2
11
'Legend
Buffer Zone 1 C
_
Buffer Zone 2
J
Wetlands
Wetland 1: 0.0090 Ac.
Impacted: 0.0090 Ac.
Existing Pipe tqo
be replaced ti/
Wetland 2: 0.0126 Ac. \
Impacted: 0.00075 Ac.
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Existing
Driveway
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50 / Zone 2:" Im cts 3,498 ft2
Zone 1: Impacts 8,293 ft2
MITCEELL ENVIRONMENTAL. PREPARED FCC. ;o ? ?. S,tte 410 CEDAR CHEST
P.O. Box 341 Woo, NC 27604 RALEIGH, NC - WAH COUNTY
d FUQUAY VARINA, NC 27526 DAIS: rev. 10/3/2008 scar f - 4V
OFFICE: 919-557-4682
FAX.•919--557557- -46683 83
SOL SC IEN11ST CONTACT- IMPACTS MAP - Wetlands & Buffer Zones 1 & 2
www.HUeheU nvironmentaLcom SCOTT MITCHEU, M map # 3
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PIN: 1705337041 o ~ ~-~~0',~ ~ ; e ry_, , e ~
INGLE FAMILY ~ ' ZONED: R-4 ~ ~ .w ° ~ O a, w. . o
o o JAME & ELIZABETH EDWAC~'DS ~ ~
o r,,,.. t P1N#: 1705433307 t` o ° o SINGLE FAMILY ~
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- 7.3s.{rle;) ~ I w ~ ~ ~ ~ ~ o JEAN L. 5HUPING ~ PI ~ 1705427974
~ jE j { 3 i ~ ~ a SGf LE FAMILY ~ ~ ~ ZONED: R-2
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i N~ 3 NIF ~F N F I N~F GEORGE T, SMIT JR. ~ H. FINOH MONSON ~ ' ~
NJF JOHN J BENNEIT ~ ROBERT & DIANNE BURKNARDT JAMES CATHERINE , BARRY ~ PATRICiA ARNETT ~ ~ MARGARET ELIZABETH H. SMITH ~ OAROLINE T. MONSON pIN~; 1705422843 1 PINS: 1705423 JEANNE P, RAIBALDI piN~: 1705420872 PINS: 1705421863 SINGLE FAMILY SINGLE FAMiI S CATHERINE JURGENSEi~ CORDON & PA RICIA BOYCE' i ~ PINS: 1705423834 ~ PIN :1705424825
PINS: 1705328840 PIN ; 1705329882 SINGLE F`AMiLY ~ SINGLE FAMILY { ~ ZONED: R-4 F ZONED: R-4 ( ~ ; ~ Q~ ~ , ' J
IN E FA ILY ~ I SINGLE FAMILY SINGLE FAMILY ZONED: R-4 ZONED: R-x S GL M SINGLE FAMILY ( ZONED: R-4 ~ ZONED: R-4 ZONED: R--4 ZONED: R 4
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BM 1984, PG. 939 WOODROW PARK WOODROW PARK WOODROW PARK LOT 4 LOT 5 DB 7089, PG. 286 BM 1954, PG. 22 BM 1954, PG, 22 BM 1954, PG. 22 WOODROW PARK WOODROW PAi LOT 5 LOT 6 ~ lNOODROW PARK WOODROtN PARK
~ DB 4569, PG. 157 DB 4848, PG. 738 DB 8427, PG. 2207 BM 1954, PG. 22 BM 1954, PG. BM 1954, PG. 22 BM 1954, PG. 22
~ DB 6562, PG. 633 DB 5693, PG, DB 5693, PG. 302 DB 1892, PG. 147
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