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Home My WebLink AboutSW8060706_COMPLIANCE_20060728STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW n vU/D 7D�p DOC TYPE ❑ CURRENT PERMIT ❑ APPROVED PLANS ❑ HISTORICAL FILE Fp COMPLIANCE EVALUATION INSPECTION DOC DATE ,21&w 4p:s� YYYYMMDD ! t INFILTRATION BASIN ANALYSIS FILENAME: S:1WQS11NBASIN1060706-1A&B.WK1 PROJECT NUMBER: SW8 060706-1A&B DATE: 13-Jul-06 PROJECT NAME: New Topsail ;H.S. DRAINAGE BASIN: Cape Fear REVIEWER: IP.Bartlettf RECEIVING STREAM: UT Old Topsail Creek CLASS: ISA; HQW I Index No.: 18-87-12 If ORW, is site within the 575' AEC? SITE AREA IMPERVIOt % IMPERVI SOILS INFt ELEVATIOr SOIL TYPE REPORTEI: SURFACE, 29.91 acres DRAINAGE AREA: 467,834 IS AREA CALCULATION Rational C BUILDINGS PARKING/ASPHALT CONCRETE OTHER 1232751 0.95 126326 0.95 35284 0.95 TOTAL 284885 C 0.66 Place a "1" here if Rational DUS, 1= 60.9% RV= .05+.009 (1) = 0.60 )RMATION I OF SEASONAL HIGH WATER TABLE 53.7 FEET MSL Sand INFILTRATION RATE 14.1 INCHESIHOUI or 0.000326 FPS kREAS 1 ELEVATIONS 1 VOLUMES Elegy. (ft) Area, sq ft Inc. Volume Acc. Volume BOTTOM 56 25,226 56 25,226 0 0 56 25,226 0 0 TOP 58 42,624 67850 67850 )EPTH 1 DRAWDOWN CALCULATION DESIGN STORM, INCHES 1.5 DESIGN VOLUME 34974 CUBIC FEET TOTAL VOLUME AVAILABLE 67850 CUBIC FEET DEPTH OF RUNOFF 2.00 FEET TIME TO DRAWDOWN 2.3 HOURS MUST BE <12 25 YEAR 24 HOUR STORM NIA Intensity, i = .33 inches I hour Qr= C i A = 2.33 CFS Op through the bottom of the basin= 8.23 CFS 10 YEAR 10 MIN HIGH INTENSITY EVENT Intensity, i = 6.3 inches 1 hour Volume for 10 yr. 10 min. event = 26660.50 CF < COMMENTS Volume and drawdown are (not) within Design Requirements. Must be > Qr SF 67850 CIF INFILTRATION BASIN ANALYSIS FILENAME: S:1WQS11NBASIN1060706-2.WK1 PROJECT NUMBER: SW8 064746-2 DATE: 13-Jul-06 PROJECT NAME: NewTopsail,H.S. DRAINAGE BASIN: Cape Fear REVIEWER: P.Bartlett RECEIVING STREAM: UT Old Topsail Creek CLASS: SSA; HQW E Index No.: 18-87-12 1 If ORW, is site within the 575' AEC? SITE AREA IMPERVIOt % IMPERVI SOILS INFI ELEVATIOI SOIL TYPE REPORTEI SURFACE, 29.9 acres DRAINAGE AREA: 149,411 IS AREA CALCULATION Rational C BUILDINGS PARKING/ASPHALT CONCRETE OTHER 43600 0.95 22216 0.95 14810 0.95 TOTAL 80626 C, 0.60 Place a "1" here if Rational DUS, 1= 54.0% RV= .05+.009 (I) = 0.54 )RMATION J OF SEASONAL HIGH WATER TABLE 49.7 FEET MSL Sand i INFILTRATION RATE 15 INCHESIHOUI or 0.000347 FPS kREAS 1 ELEVATIONS 1 VOLUMES Elev. (ft) Area, sq ft Inc. Volume Acc. Volume BOTTOM 53 15,694 , 53 15,694 0 0 53 15,694 0 0 TOP 54 15,694 15694 15694 )EPTH 1 DRAWDOWN CALCULATION DESIGN STORM, INCHES 1.5 DESIGN VOLUME 10004 CUBIC FEET TOTAL VOLUME AVAILABLE 15694 CUBIC FEET DEPTH OF RUNOFF 1.00 FEET TIME TO DRAWDOWN 1 0.8 HOURS MUST BE <12 25 YEAR 24 HOUR STORM NIA Intensity, i = .33 inches 1 hour Qr=CiA= 0.68 CFS Qp through the bottom of the basin= 5.45 CFS 10 YEAR 10 MIN HIGH INTENSITY EVENT Intensity, i = 6.3 inches 1 hour Volume for 10 yr. 10 min. event = 7840.44 CF < COMMENTS Volume and drawdown are (not) within Design Requirements. Must be > Qr SF 7 15694 C F INFILTRATION BASIN ANALYSIS PROJECT NUMBER: SW8 060706-3 PROJECT NAME: New Topsail1H.S. DRAINAGE BASIN: Cape Fear RECEIVING STREAM: UT Old Topsail Creek Index No.: 18-87-12 SITE AREA IMPERVIOt % IMPERVI SOILS INF( ELEVATIOP SOIL TYPE REPORTEE SURFACE, FILENAME: S:IWQSIINBASIN1060706-3.WK1 DATE: 13-Jul-06 REVIEWER: 1P.Bartle CLASS: ISA; HQW _ j If ORW, is site within the 575' AEC? 29.9 acres DRAINAGE AREA: 250,906 IS AREA CALCULATION a Rational C BUILDINGS PARKING/ASPHALT CONCRETE OTHER 0 0.95 212342 0.95 7200 0.95 TOTAL 219542 C 0.86 Place a "1" here if Rational OUS, 1= 87.5% RV= .05+,009 { I } = 0.84 )RMATION I OF SEASONAL HIGH WATER TABLE 51.5 FEET MSL Sand i INFILTRATION RATE 23.4 INCHESIHOUI 17 or 0.000542 FPS kREAS I ELEVATIONS I VOLUMES Elegy. {ft) Area, sq ft Inc. Volume Acc. Volume BOTTOM 54 34,487 54 34,487 0 0 54 34,487 0 0 TOP 54.8 36,886 28549.2 28549.2 )EPTH 1 DRAWDOWN CALCULATION DESIGN STORM, INCHES 1.5 DESIGN VOLUME 26267 CUBIC FEET TOTAL VOLUME AVAILABLE 28549.2 CUBIC FEET DEPTH OF RUNOFF 0.80 FEET TIME TO DRAWDOWN 1 0.4 HOURS IMUST BE <12 25 YEAR 24 HOUR STORM NIA Intensity, i = .33 inches I hour Qr=CiA= 1.63 CFS Qp through the bottom of the basin= 18.68 CFS 10 YEAR 10 MIN HIGH INTENSITY EVENT Intensity, i = 6.3 inches I hour Volume for 10 yr. 10 min. event = 18642.94 CF < COMMENTS Volume and drawdown are (not) within Design Requirements. Must be > Qr SF 2 28549.2 CF ► ON- 15 ; 50 FAX 910 343 9604 Norris, Kuske, Tunstall R 001/002 514 060-706-�' NKT Project No. 05220 INFILTRATION SITE VISIT REQUEST Name of the Project: New Topsail High School Location (attach a clear vicinity map). US 17, Hampstead Street address, SR number, community, etc_ Directions from the nearest major intersection: From NC 210 & US 17 a- Hampstead, take US 17 North. Site is approximately 2 miles on the left next to the existing school. Owner/Applicant Name: Pen_der County Schools_/ David Smith Consultant Name: Norris Kuske & Tunstall Consulting Engineers, Inc. Consultant Contact Information: 259-2187 (P) 259-0133 (F) David Smith__ Phone, fax, email, etc. Existing ground elev, @basin/trench= Bottom Elev. of infiltration basin/trench= Existing ground minus bottom eiev.= Add 2' (max. bottom elevation)= Date/Time of Soils investigation : Summary/Com � 2"? nG 41�1� " #1 #2 #3 #4 #5 #B #7 #8 /4f All proposed infiltration areas and existing, active utility lines located within the proposed basin/trench must be marked and flagged_ If these areas are not flagged, the Soils Scientist reserves the right to decline to do the investigation. if the proposed infiltration system will be located in an area of existing pavement and there is no open area nearby, equipment capable of breaking through the impervious layer must be provided. The soils investigation does not take the place of a soils report prepared by an appropriate professional. The Soils Scientist will only verify the soil conditions that are reported in the Soils Report, and make a determination as to the suitability of the site to meet the infiltration design requirements under NCAC 2H.1000, and assumes no liability should the system fail. 11/1412006 MON 15:50 F.kj 914 343 9604 Norris. Kuske, Tunslall 4002/QOZ a NORRIS, KUSKE & TUNSTALL John S. Tunstall, P.E. J. Phillip Norris, P.E. CONSULTING ENGINEERS ent P. Harrell, P.E. John A. Kuske, III, P.E. � INC.. James T. Pyrtle, P.E. J.A. Kuske, P.E. 902 Market Street • Wilmington, NC 28401-4733 • Phone (910) 343-9653 1, E-Mail: offioe@nkteng.com LETTER OF TRANSMITTAL 4gWgV0FD DEC 0 5 [U05 Y' To: Date: Job No. Q 59zQ Subject: D �` WE ARE SENDING YOU VIA ❑ ATTACHED ❑ UNDER SEPARATE COVER ❑ SHOP DRAWINGS ❑ PRINTS ❑ TRACINGS ❑ SPECIFICATIONS ❑ DISKS ❑ COPY OF LETTER 0 kFAX TRANWITfT 0- NUMBERk` �OF=y°PAGES. r ye f� " "" INCLUDING THMS'TI€RANSM1 TEAL � x '�� s ' ..' 3 : �s Ca��9� 03439653�If� O have ` anCIICl1�ta` COPIES DATE NO. DESCRIPTION 1 rEQUESTED ElFOR REVIEW AND COMMENT ❑ FOR APPROVAL YOUR USE ❑ FOR BIDS DUE ❑ YOUR PRINTS LOANED TO US REMARKS: (?�:' CC: SIGNED CONFIDENTIAL AND PRIVILEGED: Information contained in this document is privileged and confidential, intended for the sole use of the addressee. if you are not the addressee or the person responsible for delivering it to the addressee you are hereby notified that any dissemination, distribution or copying of this document is strictly prohibited. If you have received this document in error please immediately notify the sender and return to the address above. f yk ENGINEERING CONSULTING SERVICES LTD. Az, �. 4 Geotechnical s Construction Materiais - Environmental .. r Mr. David Smith Pender County Schools 925 Penderlea Highway. Burgaw, North Carolina 28425 Re: hifiltration Evaluation Topsail High School Topsail, North Carolina Dear Mr. Smith, JUL Q 1 April 7, 2006 RECEIVED 5wb 06o 7166 ECS Project No. 22:12053 ECS Carolinas, L1_13 (ECS) recently conducted an infiltration evaluation for the proposed infiltration area at the proposed site at off of US Highway 17 in Topsail, North Carolina. This letter, with attachments, is the report of our investigation. Field Investigations On April 6, 2006, ECS conducted an exploration of the subsurface soil and ground water conditions at five requested locations shown on the attached Site Diagram. The locations were selected by Mr. Phil Norris, P.E. of Norris Kuske Tunstall Consulting Engineers. The purpose of this exploration was to obtain subsurface information of the suitability of the in -place soils for the proposed infiltration area. We explored the subsurface soil and ground water conditions by advancing one hand auger boring into the existing ground surface at the five requested boring locations. We visually classified the. subsurface soils and obtained representative samples of each soil type encountered. It was not requested that ECS record the ground water level or the seasonal high water level at the test locations. The attached Infiltration Evaluation Form provides a summary of the subsurface conditions encountered at each hand auger boring location. We have conducted five infiltration tests near our hand auger boring to estimate the infiltration rate for the subsurface soils. It was requested that the infiltration tests were to be conducted at the surface elevation. 7211 Ogden Business Park 'Suite 201 'Wilmington. NC 28411 •(910) 686-91 14 'Fax (910) 686-9666 Infiltration Evaluation Topsail High School Topsail, North Carolina ECS Project No. 22.12053 Field Test Results At the first requested test location, the infiltration test was performed at 12 inches in grey fine SAND and indicated an infiltration rate of 0.22 inches per minute (13.3 inches per hour). At the second requested test location, the infiltration test was performed at 12 inches in grey fine SAND and indicated an infiltration rate of 0.39 inches per minute (23.4 inches per hour). At the third requested test location, the infiltration test was performed at 12 inches in grey fine SAND and indicated an infiltration rate of 0.24 inches per minute (14.1 inches per hour). At the fourth requested test location, the infiltration test was performed at 12 inches in grey fine SAND and indicated an infiltration rate of 0.30 inches per minute (17.7 inches per hour). At the fifth requested test location, the infiltration test was performed at 12 inches in grey fine SAND and indicated an infiltration rate of 0.25 inches per minute (15.0 inches per hour). Infiltration rates may vary within the proposed site due to possible changes in subsurface conditions. If you have any questions regarding this report, please contact us at (910) 686-9114 Respectfully, ECS CAROLINAS, LLI' �//' ,: 4,[ II J K. Brooks Wall Staff Geologist Attachments: Site Diagram Infiltration Evaluation cc: Mr. Phil Norris, P.E. —Norris Kuske Tunstall :;r.: Walid M. Sobh, P. EF y; ', 4 _ r Principal Engineer NC License No. 22983�%. MPROJECT'NO.�dL" .7 �� 1 '1 Infiltration Evalcation Topsail High School Topsail, North Carolina ECS Project No. 22.12053 April 6, 2006 Location Depth Soil Description 91 0-12" Grey fine SAND Infiltration Rate: 0.22 inches per minute (13.3 inches per hour) Test was conducted at 12 inches below the existing grade elevation. Location Depth _Soil Description #2 0-12" Grey fine SAND Infiltration Rate: 0.39 inches per nunute (23.4,inches per hour) Test was conducted at 12 inches below the e ih sting grade elevation. Location Depth Soil Description #3 0-12" Grey fine SAND Infiltration Rate: 0.24 inches per nunute (`14.1,inches per hour) Test was conducted at 12 inches below the existing grade elevation. Location Depth Soil Description #4 0-12" Grey fine SAND Infiltration Rate: 0.30 inches per minute ,(l — ,inches per hour) Test was conducted at 12 inches below the existing grade elevation. Location Depth Soil Description #5 0- 12" Grey fine SAND r� Infiltration. 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SUITE 200 WILMINGTON, NORTH CAROLINA 28412 TEL 410.790.9%1 FAX 410.709.3111 www.Ls3p.com OF THE MMBIUN INS:Rl,Tf of AAOlI1KiS COPYRIGHT 200S ALL RIGHTS RESERVED PRINTED OR ELECTRONIC DRAWINGS AND DOCUMENTATION MAY NOT RE REPRODUCED IN ANY FORM WmfOUT WRITTEN PERMISSION FROM LS3P ASSOCIATES LTD. REVISIONS w 0 U SCHEMp,TIC DESIGN SIMONE z !• D 0 a o � .z LLJ 0� 0 a uj � Q Z PRINCIPAL: JAC PROJECT ARCHITECT: ACA DESIGNED BY: ACA DRAWN BY: ACA CHECKED BY: ---- PROJECT NUMBER: 7201-041310 SITE PLAN C=01 07 NOVEMBER 2005