HomeMy WebLinkAboutSW8030620_COMPLIANCE_20080829STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW�,�(
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
tD COMPLIANCE EVALUATION INSPECTION
DOC DATE
a ��a°[
YYYYMMDD
Permit Number SW8030620
Central Files APS_ SWP_
08/29/08
Permit Tracking Slip
Program Category
Status
Project Type
State SW
Active
New Project
Permit Type
Version
Permit Classification
State Stormwater
1 00
individual
Primary Reviewer Permit Contact Affiliation
linda lewis
Permitted Flow
Facility
Facility Name Major/Minor Region
Tidewater Storage Minor Wilmington
Location Address County
410 Cando St New Hanover
Wilmington NC 28402 Facility Contact Affiliation
Owne
Owner Name Owner Type
Tom Eakes Non -Government
Owner Affiliation
Tom Eakes
PO Box 3373
Wilmington NC 28405
Dates/Events
Scheduled
Ong Issue App Received Draft Initiated Issuance Public Notice Issue Effective Expiration
01 /28/04 06/26/03 01 /28/04 01 /28/04 01 /28/14
Regulated Activities Requested/Received Events
State Stormwater - High Density Deed restriction requested
State Stormwater - Infiltration System Deed restriction received
Additional information requested 07/29/03
Additional information received 10/15/03
Additional information requested 10/30/03
Additional information received 01 /28/04
Outfall NULL
Waterbody Name Stream Index Number Current Class Subbasm
INFILTRATION TRENCH ANALYSIS
Filename G 1DATAIWPDATAIWQSIINTRENCH10306201ui
Project # 030620 jun04-trench
Project Name Tidewater Storage
Recvng Stream Smith Creek
Drainage Basin Cape Fear
Site Area 1 34 acres
Impervious Area Calculation
Buildings
Parking/Asphalt
Concrete
Total
Volume/Storage Calculation
Date 01-Jun-04
Reviewer R Hall
Classification C-Sw
Index #
Drainage Area 58370 SF
1 34 Acres
Rational Cc (list C after each BUA)
23100 1
22527 1
130 1
If Rational Method is used, place a 1 in this box
Required
Provided
Design Storm
RV
Volume to Store
Pipe Diameter
Length Of a Single run of Pipe
Number of Pipe Runs in Trench
Storage In Piping
Total Storage in Piping
Cross -Sectional Area Of Pipe Runs
Length Of Trench
Width Of Trench
Height Of Trench
Cross -Sectional Area Of Trench
Voids Volume, 40%
Trench Volume per linear foot
Minimum Trench length required
Total Volume Provided
Elevation Of Bottom Of Trench
Elevation Of SHWT
Overflow Elevation
Exfiltration Rate/Drawdown
Reported Hydraulic Conductivity
Bottom Surface Area
l0i6wdown T1me
% Impervious: 78 4%
Cc-- 083
2 inh
076
7350 C F ¢
Pipe Size 1 Pipe Size 2 G
067 Fee 10�
r 492 735 eet✓r (9��
173 ke
c Feet
c Feet
0 353
1 I- 0_+� J.nd
1 �
1 2 Feet 15 wl
32 00 SF
0073 CF
13,27 Cubic Feet
251,, Feet
0821 Cubic Feet `o L� `
Comments
Required volume, storage, and drawdown guidelines are met
30 3 Mean Sea Level
28 3 Mean Sea Level
32 3 Mean Sea Level
4 Cubic Feet Per Hour Per Sq Ft
11840 Square Feet
0,,' t hours
` INF:, TRATION TRENCH ANALYSIS
f-
Project # 030620-2 jun04-trench
Project Name Tidewater Storage
Recvng Stream Smith Creek
Drainage Basin Cape Fear
Site Area 1 34 acres
Impervious Area Calculation
Buildings
Parking/Asphalt
Concrete
Total
Volume/Storage Calculation
23100
22527
130
E�1_11i
If Rational Method is used, place a 1 in this box 0
Required
Provided
Design Storm
RV
Volume to Store
20' Trench
Pipe Diameter
Length Of a Single run of Pipe
Number of Pipe Runs in Trench
Storage In Piping
Total Storage in Piping
Cross -Sectional Area Of Pipe Runs
Length Of Trench
Width Of Trench
Height Of Trench
Cross -Sectional Area Of Trench
Voids Volume, 40%
Trench Volume per linear foot
Minimum Trench length required
Total Volume Provided
Elevation Of Bottom Of Trench
Elevation Of SHWT
Overflow Elevation
ExHitratron Rate / Drawdown
Reported Hydraulic Conductivity
Bottom Surface Area
Drawdowtl Tim
Filename G IDATAIWPDATAIWQSIINTRENCH1030620-2
Date 09-Jun-04
Reviewer R Hall
Classification C-Sw
Index #
Drainage Area 58370 SF
1 34 Acres
Rational Cc (list C after each BUA)
1
% Impervious:
Cc- 083
2 in
076
7350 CF
78 4%
Pipe Size 1 Pipe Size 2
067 1 Feet
198 337 Feet
1 1
70 265 Cubic Feet
4 Cubic Feet
0 353 0 785
344 Feet
16 Feet
2 Feet
3200 SF
4160 C F
1l* Cubic Feet
Feet
456E Cubic Feet
Comments
Required volume, storage, and drawdown guidelines are met
30 3 Mean Sea Level
28 3 Mean Sea Level
32 3 Mean Sea Level
4 Cubic Feet Per Hour Per Sq Ft
5504 Square Feet
4.3 hours
q1555
INFI11TRATION TRENCH ANALYSIS
Filename
G1DATAIWPDATAIWQSIINTRENCH1030620 ju
r
Project #
030620 Jun04-trench
Date
09-Jun-04
Project Name
Tidewater Storage
Reviewer
R Hall
Recvng Stream
Smith Creek
Classification
C-Sw
Drainage Basin
Cape Fear
Index#
Site Area
1 34 acres
Drainage Area
58370 SF
1 34 Acres
Impervious Area Calculation
Rational Cc (list C after each BUA)
Buildings
23100
1
Parking/Asphalt
22527
1
Concrete
130
1
Total
45757
% Impervious-- 78 4%
Volume/Storage Calculation
If Rational Method is used, place a 1 in this box 0
Required
Provided
Design Storm
RV
Volu'nw to Storrs
16' Trench
Pipe Diameter
Length Of a Single run of Pipe
Number of Pipe Runs in Trench
Storage In Piping
Total Storage in Piping
Cross -Sectional Area Of Pipe Runs
Length Of Trench
Width Of Trench
Height Of Trench
Cross -Sectional Area Of Trench
Voids Volume, 40%
Trench Volume per linear foot
Minimum Trench length required
Total Volume Provided
Elevation Of Bottom Of Trench
Elevation Of SHWT
Overflow Elevation
Exhitration Rate / Drawdown
Reported Hydraulic Conductivity
Bottom Surface Area
011`awdown Time
Cc- 083
2 in
076
7350 JCF
Pipe Size 9 Pipe Size 2
067 1 Feet
228 -37-& Feet 39 4-
1 1
80 295 JCubic Feet
7 Cubic Feet
0 353 0 785
376 Feet
16 Feet
2 Feet
3200 SF
4642 CF
.?' Cubic Feet '1 3
Feet
4990 Cubic Feet
30 3 Mean Sea Level t
28 3 Mean Sea Level 22
32 3 Mean Sea Level ICA
Z�
Comments
Required volume, storage, and drawdown guidelines are met
4 Cubic Feet Per Hour Per Sq Ft
6016 Square Feet
.37 1hours
2 If this application is being submitted as the result of a renewal or modification to an existing permit, list
The existing permit number NA and and its issue date (if known)
3 Specify the type of project (check one)
Low Density X High Density Redevelop General Permit Other
4 Additional Project Requirements (check applicable blanks)
CAMA Major X Sedimentation/Erosion Control 404//401 Permit NPDES Stormwater
Information on required state permits can be obtained by contacting the Customer Service Center at
1-877-623-6748
III. PROJECT INFORMATION
1 In the space provided below, summarize how stormwater will be treated Also attach a detailed narrative
(one to two pages) describing stormwater management for the project
underground infiltrations stem
2 Stormwater runoff from this project drams to the Cape Fear River basin
3 Total Project Area 1 31 acres
5 How many drainage basins does the project have9 I
4 Project Built Upon Area 8057 %
6 Complete the following information for each drainage area if there are more than two drainage areas in the
project, attach an additional sheet with the information for each area provided in the same format as below
t1+1 �i i+3 itl East€.. Br lt{Ep{I f �% �}Ei gSYF` gt j ij
$ism InformahondE [,4E1 { `' ry gj,i�1 �q3q
L3 3 N9 'il IS lHV[VM99e4aia913lYft ��si��+iEQidE �EItSE� M§kti � I S � �&
i � q i i Nd'; ids 9 4 f Fs=in: * f iEi Ei€ e Et Ej16 9 a'9 Sj�j 1�iF3 4y
1I 'i pl j ?§??��jDrama a Basznll� 9�943 ��� _
� 3 � 3tEe!`B'eg �
�ai�9gl �6 V'4 % 11€1%' , �pixi 9tiY Y9 6` 666 ll�e i(f ¢ t 8<7 , iy s�
¢ I iDra�na e�Basin 2'� °r�=
y�3 ��i g 3 E 3�
Receiving Stream Name
Smith Creels
Receiving Stream Class
C-SW
Drainage Basin Area
1 31 ac
Existing Impervious * Area
-
Proposed Impervious * Area
1 05 ac
% Impervious* Area (total)
79%
i4 1 E f f ......... 3VEI4Fft1E *�[ HaFttf F,6t€§ i FS 'i{{ #auYa§ib ( S ? '
Imper�iovus i� aSu3rfa4e id�!t�e i 1
s j(! 3(�} I ( 3 F ts&# 6$ f4$ Sti1F h HkiF t E E E 9 g@ € 3 �3��@ j9a
� I{ [, �5 Drainage(Basm 6�l3a� 1 Is s
e�i6�eDaEe i� i f Sss ii NU3F 3i9d96 iP9t9 f 1i6F� i€E(�
"i ,2
_ i33,1 F� Drama" Ma.
On -site Buildings
23,100 sf
On -site Streets
-
On -site Parking
22,527 sf
On -site Sidewalks
130 sf
Other on -site
-
Off -site
-
Total
E=45,757 sf
E=
* Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking
areas sidewalks, gravel areas, etc
Form SWU-101 Version 3 99 Page 2 of4
Permit No &2& 030(a(p
(to Ee provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
UNDERGROUND INFILTRATION TRENCH SUPPLEMENT
This form may be photocopied far use as an original
D WQ Stormwater Management Plan Review
A complete stormwater management plan submittal includes a stormwater management permit application, an
underground infiltration trench supplement for each system, design calculations, and plans and specifications
showing all stormwater conveyances and system details
I PROJECT INFORMATION
Project Name Tidewater Storayze
Contact Person Phillip Tripp_ - Phone Number 910 763-5100
For projects with multiple infiltration systems, a supplement form must be completed for each system This
worksheet applies to Trench 1 in Drainage Area 1
(from plans) (from Form SWU-1 DI)
I1. DESIGN INFORMATION (attach supporting calculations/documentation)
Soils Report Summary (based upon an actual field investigation and soil borings)
Soil Type BUmead_e (fine sandy loam)
Infiltration Rate 48 n/h or cf/hr/sf (circle appropriate units)
SHWT Elevation 283 fmsl (Seasonal High Water Table elevation)
Trench Design Parameters
Design Volume
7403
c f
Design Storm
2 0-
inch event (1 5 inch event for SA waters, 1 inch event for others)
Drawdown Time
05
days hours
Perforated Pipe Size
899/12"
inch diameter
Perforated Pipe Length
492 / 73 5
ft
No Observation Wells
0
(may be required on a case -by -case basis)
Stone Type (if used)
#57 crushed
rg_anite
Stone Void Ratio
04
Trench Elevations (in feet mean sea level)
Bottom Elevation 303 fmsl
Storage/Overflow Elevation 32 3 fmsl
SWU-107 Rev 3 99 Page 1 of
Trench Dimensions
Height
Width
2 ft
16 ft
III REQUIRED ITEMS CHECKLIST
Length
Volume Provided
674 ft
10,789 cu ft
The following checklist outlines design requirements per the Stormwater Best Management Practices manual (N C
Department of Environment, Health and Natural Resources, November 1995) and Administrative Code Section 15
A NCAC 2H 1008
Initial in the space provided to indicate the following design requirements have been met and supporting
documentation is attached If the applicant has designated an agent in the Stormwater Management Permit
Application Form, the agent may initial below Attach justification if a requirement has not been met
Applicants Initials
a
System is located 50 feet from class SA waters and 30 feet from other surface waters
b
System is located at least 100 feet from water supply wells
i c
Bottom of system is at least 2 feet above the seasonal high water table
d
Bottom of the system is 3 feet above any bedrock or impervious soil horizon
NA e
Off-line system, runoff is excess of the design volume bypasses the system (bypass detail
provided)
f
System is designed to draw down the design storage volume to the proposed bottom
elevation under seasonal high water conditions within five days based upon infiltration
through the bottom only (a hydrogeologic evaluation may be required)
Al g
Soils have a minimum hydraulic conductivity of 0 52 inches per hour
Alh
System is not sites on or in fill material or DWQ approval has been obtained
Al i
Plans ensure that the installed system will meet design specifications (constructed or
restored) upon initial operation once the project is complete and the entire drainage area is
stabilized
System is sized to take into account the runoff at the ultimate built -out potential from all
surfaces draining to the system, including any off -site drainage
k System is located in a recorded drainage easement for the purposes of operation and
maintenance and has recorded access easements to the nearest public right-of-way
1 System captures and infiltrates the runoff from the first 1 0 inch of rainfall (1 5 inch event
for areas draining to SA waters)
m Drainage area for the device is less than 5 acres
�- n A pretreatment device ( filter strip, grassed swale, sediment trap, etc ) is provided
o Trench bottom is covered with a layer of clean sand to an average depth of 4 inches
p Sides of infiltration trench are lined with geotextile fabric
q Rock used is free of fines (washed stone) and has large void ratio
r Side to bottom ratio is less than 4 1
SWU-107 Rev 3 99 Page 2 of