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Home My WebLink AboutSW8051135_COMPLIANCE_20051219STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW 9,'.JSl�3J DOC TYPE El CURRENT PERMIT ❑ APPROVED PLANS ❑ HISTORICAL FILE COMPLIANCE EVALUATION INSPECTION DOC DATE BLS/21%' YYYYMMDD INFILTRATION TRENCH ANALYSIS Filename S IWPDATAIWQSIINTRENCH1051135 Project # SW8 051135 Date Project Name UNCW - Wagoner Hall Renovation Reviewer Recvng Stream UT of Bradley Creek Classification Drainage Basin Cape Fear Index # Site Area 0 4 acres Drainage Area Impervious Area Calculation Buildings Streets OS Prkg OS sidewalks Total Volume/Storage Calculation 19-Dec-05 R Gordon Sc 18-87-24-4-(2) 8,700 SF 0 20 Acres Rational Cc (list C after each BUA) 1500 1 1 1 400 1900 If Rational Method is used, place a 1 in this box u 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% Total Voids Volume Total Volume Provided Elevation Of Bottom Of Trench Elevation Of SHWT Overflow Elevation Exfrltratlon Rate / Drawdown Reported Hydraulic Conductivity Bottom Surface Area Drawdown Time 25 YEAR 24 HOUR STORM NIA Intensity, i = 33 inches / hour Qr=CEA= Qp through the bottom of the basin= 10 YEAR 10 MIN HIGH INTENSITY EVENT Intensity, i = 6 3 inches / hour Volume for 10 yr 10 min event = % Impervious= 21 8% Cc- 033 1 in 025 179 CF Pipe Size 1 1 Pipe Size 2 05 Feet 40 Feet 1 each 8 0 Cubic Feet 8 Cubic Feet 0 196 0 000 SF 40 Feet 10 Feet 1 2 Feet 1200 000 SF 189 0 CF 199 CF 7 Cubic Feet 0 02 CFS 0 0093 CFS 248 18 CF < 35 8 Mean Sea Level 33 8 Mean Sea Level 38 5 Mean Sea Level 0 0833 Cubic Feet Per Hour Per Sq Ft 400 0 Square Feet S. hours Must be > Qr 197 CF ■ Oct 17 05 11-34a Rae Pc 19102512208 P 1 PC- SeS S 2� �� NCDENR Cf North Carolina Department of Environment and Natural Resources 1 �` 127 Cardinal Drive Wilmington NC 28405 (910) 796-7307 FAX (910) 350-2004 Request for Express Permit Review 4 e --& FILL-IN all information below and CHECK required Permit(s) FAX or email to Cameron Weaver(,ncmad net along with a narrative and vicinity map of the project location Projects must be submitted by 9 00 A M of the review date, unless prior arrangements are made APPLICANT Name Dr Ron Core Company T._,UNCW Address 601 South College Road—City/State Wilmington, NC,Zip-28403— County_New Hanover Phone 910-962-3761 Fax Email PROJECT Name Wagoner Hall Renovations PROJECT SYSTEM(S) TRIBUTARY TOUT — Bradley Creek —(STREAM NAME) .Cape Fear RIVER BASIN ENGINEER/CONSULTANT Shane Lippard Company —Right Angle Engineering Address _212 Princess Street City/State—Wilmington, NC Zip_28401—County_New Hanover Phone_910-251-8544 Fax_910-251-2208 Erna d_raepcsl@bellsouth net _. ---------- I——--------------------------------------------------------------------------------- I-------------------------------------------------------------------- State or National Environmental Policy Act (SEPA, NEPA) — EA or EIS Required ❑ Yes ® No ❑ STREAM ORIGIN Determination, # of stream calls, Stream Name ® STORMWATER ❑ Low Density ❑ High Density -Detention Pond ❑ High Density -Other Wetlands MUST be addressed below ❑ Low Density -Curb & Gutter ® High Density -Infiltration ❑ Off Site ❑ COASTAL ❑ Excavation & Fill ❑ Bridges & Culverts ❑ Structures Information MANAGEMENT ❑ Upland Development ❑ Marina Development ❑ Urban Waterfront ❑ LAND QUALITY ❑ Erosion and Sedimentation Control Plan with acres to be disturbed WETLANDS (401) Wetlands on Property ❑ Yes ® No Isolated Wetlands on Property ❑ yes ® No Check all that cipVt Wetlands Will Be Impacted ❑ Yes ® No Wetland Impacts Acre(s) Wetlands Delineation has been completed ❑ Yes ❑ No ❑ Buffers Impacted Acres) USA COE Approval of Delineation completed ❑ Yes ❑ No 404 Application in process wlUSACO✓y ❑Yes ❑No I Permit received from USACE []Yes []NO 401 Application required ❑Yes ❑ No If Yes, ❑ Regular ❑ Express Additional fees, not to exceed 50% of the original Express Review permit application fee, may be charged for subsequent reviews due to the insufficiency of the permit applications For DENR use on1v ro SUBMITTAL DATES Fee Split for multiple permits 1 a CAMA '+ `} LQS $ 401_ __ $ Total Fee Amount $ Oct 17 05 11:34a Rae Pc 19102512208 p 2 DESIGN NARRATIVE FOR WAGONER HALL RENOVATIONS AND PATIO ADDITION UNCW CAMPUS NEW HANOVER CO, N C OCTOBER 2005 TABLE OF CONTENTS 1 0 PROJECT DESCRIPTION 20 SITE DESCRIPTION 30 ADJACENT PROPERTY 40 DRAINAGE CONSIDERATIONS 50 EROSION CONTROL CONSIDERATIONS 60 CONSTRUCTION SCHEDULE 70 VEGETATION PLAN 80 MAINTENANCE PLAN APPENDIX STORM WATER CALCULATIONS Wagoner Hall Renovations October 2005 f Got 17 05 11:34a Rae Pc 19102512208 P-3 1 Proiect Description The Wagoner Hall Renovations project is primarily an interior building modification but has the addition of a dining patio outside of the existing building The site is located on the campus of UNCW on Walton Drive The land disturbing activity associated with the protect will consist of clearing and grubbing of vegetation, grading and installation of unit pavers, and the small collection system to an underground infiltration trench The total area which will be disturbed for this project is 0 25 acres and the total impervious proposed for the project is 1900 square feet The project has been designed as a pocket of high density with an underground infiltration trench for treatment of the stormwater 2 Site Description The project site z in New Hanover County, NC, located on the campus of UNCW and drains to an unnamed tributary of Bradley Creek New Hanover County Soils Survey by USDA SCS has soil type listed as 6aymeade with permeability rates ranging from 1 to 8 0 inches per hour at depth 11-54 inches New construction onsite will consist of a unit paver patio and concrete sidewalks that will drain to the underground infiltration trench Land use in the vicinity is educational 3 Drainage Considerations The project being a pocket of high density will require treatment of the 1 inch runoff of burst upon areas An infiltration trench is designed to store 188 cubic feet of storm water runoff volume in 40 linear feet of 6" corrugated plastic pipe 5 Erosion Control Considerations The following erosion control measures are used on this project Temporary Gravel Construction Entrance/Exit To prevent sediment from leaving the site, temporary gravel construction entrance should be installed where Brookhaven Road enters the site For dimensions and specifications, see construction details 2 Land Grading The land will be graded to drain off in all directions from the building Fill on site will be required to have elevation of finished floor above flood elevation Roadways to be sloped to follow with natural grades 3 Silt Fence Silt fence should be installed prior to clearing and grading activities Silt fence should be checked routinely If needed, silt fence should be cleaned and replaced if damaged See Construction Detail for dimensions and specifications Wagoner Hall Renovations October 2005 Oct 17 05 11 34a Rae Pc 19102512208 p.4 6 Construction Schedule 1 Obtain plan approval and other applicable permits 2 Hold pre -construction meeting at least one week prior to beginning construction 3 Install temporary construction entrance/exits 4 Before clearing and grading of the site, install silt fencing and clean and replace as necessary 5 Begin clearing and grading of the site 6 Fill site as needed to accomplish finish grades 7 Install patio, drainage system, and infiltration trench 8 Seed and sod areas as required 9 All erosion and sediment control practices will be inspected bi-weekly and after each rainfall event Needed repairs will be made immediately 7 Vegetation Plan 1 After complete stab4tzatton of the entire covered area, top cover soils will be roughened by making 1 "-2" deep grooves perpendicular to the slope 2 Spread lime (agricultural limestone) evenly over the area at a rate of 1 5 tons/acre spread 10-10-10 fertilizer at a rate of 1000 lb/acre and incorporate into the top 6" of soil 3 Loosen surface prior to applying seed 4 Broadcast seed at recommended rates 5 Rake seed into the soil and lightly pack to establish good contact 6 Mulch with 4000 lb/acre grain straw or equtva€ent and anchor by weighted farm disc set nearly straight or other mulch anchoring tool 7 Mow as needed and refertilize in late winter or early spring by topdressing with 10- 10-10 fertilizer 8 Graded surfaces shall not be exposed without grass coverage for more than 15 days If grades are not complete and exposure is more than 15 days, temporary seed with rye grain at 50 lb/acre 8 Maintenance Plan 1 Contractor shall maintain all sedimentation and erosion control devices during construction WagOIM Hall Rcriw ations October 2005 Oct 17 05 11:34a Rae Pc 19102512208 P.5 2 All devices shall be checked after each rain event and weekly Repairs shall be made immediately when detected 3 Contractor shall complete the inspection reports required by the approved Storm Water Permit and have logs available on site 4 Any deficiencies shall be brought to the immediate attention of the Engineer and Owner Seed Types and Application Rate I Schedule Temporary Seeding Grass Type Amount 11000 SF Time of Seeding Initial Rye Grain 1-2 lbs Nov —Jan 25 lbs 10-10-10 Brown Top Mullet 1-2 lbs June —_Au—_AuL 25 lbs 10-10-10 Permanent Seeding Grass Type Amount Time of Initial Fertilization / Fertilization I Fertilization I 11000 Seeding 1000 sf 1000 sf 1000 sf sf Maintenance maintenance maintenance Burmuda, 1-2 lbs Apr — 25 ibs March -April Each 4-8 Aug -Sept Common June 10-10-10 12lbs Weeks 12lbs 10-10-10 1-2 lbs N 10-10-10 Fescue, Tall 5-7 lbs Sept — 25 Ibs Feb -March May & Dec Sept -Oct (Kentucky Oct 10-10-10 12 lbs '/2 to 1 lb n 12 lbs 31) Feb — 10-10-10 10-10-10 Oct Bermuda March — 25lbs March -April Each 4-8 Aug -Sept Sod Apr 10-10-10 12lbs Weeks 12lbs 10-10-10 1-2 lbs N 10-10-10 END OF PLAN Wagoner Hall Renovations October 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