SW8020503_COMPLIANCE_20020711

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
DOC TYPE
❑CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
COMPLIANCE EVALUATION INSPECTION
DOC DATE-
YYYYMMDD

1NFI(JRATION TRENCH ANALYSIS
Project # SW8 020503-A,B,AB-AB
Project Name City Block
Recvng Stream Cape Fear River
Drainage Basin CFR
Site Area 1.92 acres
Impervious Area Calculation
I
Buildings 17473
Parking/Asphalt 16407
Concrete 12596
Total
Volume/Storage Calculation
Filename: G:\DATA\WPDATA\WQS\INTRENCH\ SW8 02C
Date 1 1-Jul-02
Reviewer NML
Classification SC
Index #
Drainage Area 51836 SF
1.19 Acres
Rational Cc (list C after each BUA)
% Impervious-
89.7%
If Rational Method is used, place a 1 in this box
Cc- 0.02
Required
Design Storm
1 in
RV
0.86
urne.;16'.' e
WN
C F
Pt6vided pipe size I
Pipe Size 2
Pipe Diameter
0.5 1 Feet
Length Of Pipe
72 53 Feet
Storage In Piping
14 42 Cubic Feet
Total Storage in Piping
Feet
Length Of Trench
r.45 Feet
Width Of Trench
20 Feet
Height Of Trench
4 Feet
Cross -Sectional Area Of Trench
80.00 SF
Voids Volume (40% voids)
CF
Total Volume, pipe + voids
3q Cubic Feet
J Trench Volume per linearfoot
32 Cubic Feet
Minimum Trench length required
Feet
Elevation Of Bottom'Of Trench 47.5 Mean Sea Level
Elevation Of SHWT 37 Mean Sea Level
Overflow Elevation 51.5 Mean Sea Level
Exffitration Rate / Drawdown
Reported Hydra ulic., Conductivity
Bottom Surface Area
'X 'edW :bWm'­,. Trine
Comments: See AAAB-A & A,B,AB-B
Required volume, storage, and drawdown guidelines are met.
3.5 Cubic Feet Per Hour Per Sq Ft
bbo Square Feet
110flhours.

k
.., ' INFILTRATION TRENCH ANALYSIS
Project # SW8 020503-A,B,AB-B
Project Name City Block
Recvng Stream Cape Fear River
Drainage Basin CFR
Site Area acres
Impervious Area Calculation
Buildings
Parking/Asphalt
Concrete
Total
Volume/Storage Calculation
If Rational Method is used, place a 1 in this box
lice Required
Design Storm
RV
Provided
Pipe Diameter
Length Of Pipe
Storage In Piping
Total Storage in Piping
Length Of Trench
Width Of Trench
Height Of Trench
Cross -Sectional Area Of Trench
Voids Volume (40% voids)
Total Volume, pipe + voids
are Trench Volume per linear foot
Minimum Trench length required
Elevation Of Bottom Of Trench
Elevation Of SHWT
Overflow Elevation.
Exfiltration Rate / Drawdown
Reported Hydraulic Conductivity
Bottom Surface Area
..........................................
..........................................
Dra'wclowr`:>fii'me
Filename: G:IDATAIWPDATAIWQSIINTRENCHI SW8 02t
Date 11-Jul-02
Reviewer NML
Classification SC
Index #
Drainage Area SF
0.00 Acres
k
Rational Cc (list C after'each BUA)
Comments: See A,B,AB-AB & A,B,AB-B
Required volume, storage, and drawdown guidelines are met.
% Impervious: #DIV/O!
Cc: #DIV/O!
.1 in
#DIV/O!
CF
'ipe Size 9
Cubic Feet
Feet
47.5 Mean Sea Level
37 Mean Sea Level
51.5 Mean Sea Level
3.5 Cubic Feet Per Hour Per Sq Ft

t
y;IPJFi'i T�tATION TRENCH ANALYSIS
Project # SW8 020503-A,B,AB-A
Project Name City Block
Recvng Stream Cape Fear River
drainage Basin CFR
Site Area acres
Impervious Area Calculation
Buildings
Parking/Asphalt
Concrete
Total
Volume/Storage Calculation
If Rational Method is used, place a 1 in this box l�
Required
Design Storm
RV
Vo[um for Store
r •:.......:::::....:.:::::.:.::::::.�::.
Provided
Pipe Diameter
Length Of Pipe
Storage In Piping
If
Total Storage in Piping
Length Of Trench
Width Of Trench
Height Of Trench
Cross -Sectional Area Of Trench
Voids Volume (40% voids)
Total Volume, pipe + voids
Trench Volume per linear foot
Minimum Trench length required
,. Elevation Of Bottom Of Trench
Elevation Of SHWT
Overflow Elevation
Exfiltration Rate / Drawdown
Reported Hydraulic Conductivity
Bottom Surface Area
C edwdowr ...Ti.me
Filename: GIDATAIWPDATAIWQSIINTRENCHI SW8 02C
Date 11-Jul-02
Reviewer NML
Classification SC
Index #
Drainage Area SF
0.00 Acres
Rational Cc (list C after each BUA)
%,,Impervious= #DIV/0!
Cc: #DIV/0!
1 in
#DIV/0!
'2225� CF
pipe size 1 JPipe Size 2
Comments: See A,B,AB-AB & A,B,AB-B
Required volume, storage, and drawdown guidelines are met.
Cubic Feet
Feet
47.5 Mean Sea Level
37 Mean Sea Level
51.5 Mean Sea Level
3.5 Cubic Feet Per Hour Per Sq Ft
2550 Square Feet
<0.25: hours

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INFt'L7RATION TRENCH ANALYSIS
i
Project # SW8 020503-C
Project Name City Block
Recvng Stream Cape Fear River
Drainage Basin CFR
Site Area 1.92 acres
Impervious Area Calculation
Buildings
Parking/Asphalt
Concrete
Total
Volume/Storage Calculation
6206
2506
If Rational Method is used, place a 1 in this box 0
Required
Design Storm
RV
•�r
P- rovided
Pipe Diameter ,
Length Of,Pipe
Storage In Piping
Total Storage in Piping
Length Of Trench
Width Of Trench
Height Of Trench
Cross -Sectional Area Of Trench
Voids Volume (40% voids)
Total Volume, pipe + voids
f
Trench Volume per linear foot
Minimum Trench length required
k � sn11'a'
Elevation Of Bottom Of Trench
Elevation Of SHWT
Overflow Elevation ,
Fxfiltration Rate / Drawdouvn'
Reported Hydraulic Conductivity
Bottom Surface Area
Filename: G:IDATAIWPDATAIWQSIINTRENCHISW8 020
Date 11-Jul-02
Reviewer NML
Classification SC
Index t#
Drainage Area 12197 SF
0.28 Acres
Rational Cc (list C after each BUA)
Comments: ok
Required volume, storage, and drawdown guidelines are met.
% Impervious- 71.4%
Cc 0.06
Cubic Feet
Feet
46.5 Mean Sea Level
37 Mean Sea Level
50.5 Mean Sea Level
3.5 Cubic Feet Per Hour Per Sq Ft
850 Square Feet
24> hours

INFILTRATION TRENCH ANALYSIS
Project # SW8 020503-D
Project Name City Block
Recvng Stream Cape Fear River
Drainage Basin CFR
Site Area 1.92 acres
Impervious Area Calculation
Buildings
Parking/Asphalt
Concrete
Total
Volume/Storage Calculation
3232
1150
4392
If Rational Method is used, place a 1� in this box
Required
Design Storm
RV
Volume taStone
...
L
Provided
+ a. Pipe Diameter
Length Of Pipe
Storage In Piping
Total Storage in Piping
Length Of Trench
Width Of Trench
Height Of Trench
Cross -Sectional Area Of Trench
Voids Volume (40% voids)
Total Volume, pipe + voids
Trench Volume per linear foot
Minimum Trench length required
l.. ,
Elevation Of Bottom Of Trench
Elevation Of SHWT
Overflow Elevation
ExHitration Rate / Drawdown
Reported Hydraulic Conductivity
Bottom Surface Area
Or
Draw own -.Time
Filename: G:IDATAIWPDATAIWQSIINTRENCHISWB 020
Date . 11-Jul-02
Reviewer NML
Classification SC
Index #
Drainage Area 5663 SF
- 0.13 Acres
Rational Cc (list C after each BUA)
% Impervious- 77.4%
Cc: 0.05
Cubic Feet
20: Feet
42 Mean Sea Level
37 Mean Sea Level
46 Mean Sea Level
Comments: ok
Required volume, storage, and drav�down guidelines are met.

,r
INFILTRATION TRENCH ANALYSIS
Project # SW8 020503-E
Project Name City Block
Recvng Stream Cape Fear River
Drainage Basin CFR
Site Area 1.92 acres
-Impervious Area Calculation
Buildings
Parking/Asphalt
Concrete
Total
5390
5469
1421
:.l22W
Volume/Storage Calculation
If Rational Method is used, place a 1 in this box 0
Required
Design Storm
RV
Volume to'S#o.re
L'.l..........................................
r Provided
Pipe Diameter
Length Of Pipe
Storage In Piping
Total Storage in Piping
Length Of Trench
Width Of Trench
Height Of Trench
Cross -Sectional Area Of Trench
Voids Volume (40% voids)
Total Volume, pipe + voids
,Ulf Trench Volume per, linear foot
Minimum Trench length required
Elevation Of Bottom Of Trench
Elevation Of SHWT
Overflow Elevation
Exfiltration Rate / Drawdown
Reported Hydraulic Conductivity
Bottom Surface Area
Filename: G:IDATAIWPDATXWQSIINTRENCHISW8 020
Date 'I 1=Ju1-02
Reviewer 'NML
Classification ;SC* ? .
Index # - -
Drainage Area 13939 SF
0.32 Acres
Rational Cc (list C after each BUA)
% Impervious- 88.1 %
Cc: 0.02
Cubic Feet
Feet
40 Mean Sea Level
37 Mean Sea Level
44 Mean Sea Level
3.5 Cubic Feet Per Hour Per Sq Ft
'950 Square Feet
9.; hours
�I
Comments: ok
Required volume, storage, and drawdown guidelines are met.
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t 2592 ' HOPE MILLS, ROAD;" _
• IFAYETTEVILLE, : NC :�28306'
ENGINEERING-INC. -910426�2323
October 25, 2001
Tripp Engineering
419 Chestnut Street
Wilmington, North Carolina 28401
Attention: Mr. Phil Tripp
Reference: Infiltration Evaluation
Promenade Development
Wilmington, North Carolina
Job No: 3577 - 01
Dear Mr. Tripp:
Soil Tech Engineering, Inc. has recently conducted an evaluation of the existing site
conditions for the development of the Promenade Project located between Third and
Fourth Streets and Brunswick and Hanover Streets in Wilmington, North Carolina.
We conducted an investigation of the subsurface soils at the designated storm water
infiltration area indicated on the attached site sketch on October 16 and 17, 2001. The
purpose of our investigation was to determine the suitability of the in -place soils for the
discharge of stormwater runoff. We investigated the subsurface soils to a depth of six
feet below the existing ground surface. We also classified each subsurface strata
encountered by depth and obtained representative soils samples of each strata at the
designated locations.
Selected soil samples were tested in our laboratory for grain size structure in
accordance with the American Society for Testing and Materials (ASTM) procedures
entitled ASTM D-422; "Particle Size Analysis of Soils". Our sampling indicated that the
subsurface soils at the test location and the predicted infiltration depths to be drainable
stratas of fine grained sands. These drainable sands extended to the depths we were
capable of investigating to using hand tools.

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{ 'Ilnfilt 4on E
Promenade
Wiirhingtan;
Page'Two
1
valuation-
Project`
Nokh Carolina
�ii. ilv ! fj''"7s r',� � � 5• yr a ' .r— v :" • � �i, � ATk� 1t.c0 t a
We also conducted an evaluation of the subsurface infiltration at the designated
locations. The infiltration rate of the in -place soils were determined at a depth of
approximately 30 inches below the existing ground surface at the location investigated.
The infiltration rate was found to be range from 0.7 to 4.0 inches per minute, based on
our analysis. We did not encounter groundwater at the locations investigated to a
depth of six feet below the existing ground surface. In our opinion, the seasonal high
groundwater condition should below the depths explored because of the light coloration
of the in -place soils.
Please find the results of our field and laboratory tests and a sketch indicating the
location checked. If you have any questions after reviewing this report, please do not
hesitate to contact us.
Very truly yours,
SOIL TECH ENGINEERING, INC.
r- e ,"%ijIIII#offs,
�o�• ��ti'•;
Parks A. Downing, Jr. o F�ssio '. y
-v
Manage SSA!
4460
ames Pate, P.E. %;;;Fsc�?;;
PADjr:JPlad

Infiltration Evaluation
Promenade Development
Wilmington, North Carolina
Job No.: 3677 - 01
Date: October 16, 2001
Location Depth Soil Description
# 1 0" - 12" Tan Silty Fine to Medium SAND
12" - 20" Black Marl
20" - 72" Orange Tan Fine to Medium SAND
Groundwater was not encountered to depths investigated.
Infiltration Rate : 4.0 inches per minute
Test was conducted at 30 inches below the existing ground surface.
1.,4gtion Depth Soil Description
# 2 0" - 8" ABC Stone Gravel
8" - 24" Gray Brown Silty Fine to Medium SAND
24" - 72" Orange Tan Fine to Medium SAND
Groundwater was not encountered to depths investigated.
Infiltration Rate : 0.7 inches per minute
Test was conducted at 30 inches below the existing ground surface.
Location nth Soil Description
# 3 0" - 6" Brown Silty Fine to Medium SAND (Much)
6" - 72" Orange Tan Fine to Medium SAND
Groundwater was not encountered to depths investigated.
Infiltration Rate : 2.2 inches per minute
Test was conducted at 30 inches below the existing ground surface.

Fourth Street
Thi i d Street
• Denotes location of infiltration testing and investigation.
Promenade Devel 2aq
Wi lmi rpton, Il DM Carolina

Grain Size Analysis
Promenade Project
Wilmington, North Carolina
.fob No.: 3577 - 01
Location :
# 1
# 2 # 2
# 3
20" - 72"
8" - 24" 24" - 72"
3" - 72"
y�, Size
# 10
98.4
Percent Passing, By Weight
95.7
97.8 99.3
# 40
63.7
83.7 82.1
70.9
# 80
9.5
18.2 13.2
9.7
# 200
3.7
7.6 5.3
1.9
Percent Moisture ;
4.2%
6.4% 4.0%
3.5%
Soil Description :
Orange
Black Tan
Tan
Tan
Brown Fine to
Fine to
Fine to
Fine to Medium
Medium
Medium
Medium SAND
SAND
SAND
SAND