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Home My WebLink AboutSW8030620_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