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Home My WebLink AboutSW6110105_401 Certification Application_20110307Permit No. 59WW-11&1Y0.5 (to be provided by DWQ) ojov W A r, STORMWATER MANAGEMENT PERMIT APPLICATION FORM c tdCDEPIR 401 CERTIFICATION APPLICATION FORM o INFILTRATION TRENCH SUPPLEMENT This form must be filled out, printed and submitted. The Required Items Checklist (Part III) must be printed, filled out and submitted along with all of the required information. �I.'%PROJECT,INFORMATION;%ra'fsar6Nf=x} +' RE IN:.# "a } f1 $ r Ta ili, wTti Project name Fort Bragg SOF Opeiatoos Additions . - - Contact person John Peterson Phone number 501-372-2900 Date 1212212010 Drainage area number 2, Site Characteristics Drainage area Impervious area Percent impervious Design rainfall depth Peak Flow Calculations 1-yr, 24-hr rainfall depth 1-yr, 24-hr intensity Pre development 1-yr, 24-hr discharge Post -development 1-yr, 24-hr discharge Pre/Post 1-yr, 24-hr peak flow control Storage Volume: Non -SA Waters Minimum volume required Volume provided Storage Volume: SA Waters 1.5' runoff volume Pre -development 1-yr, 24-hr runoff volume .Post -development 1-yr, 24-hr runoff volume Minimum volume required Volume provided Soils Report Summary Soil type Infiltration rate SHWT elevation Trench Design Parameters Drawdown time Perforated pipe diameter Perforated pipe length Number of laterals Stone type (if used) Stone void ratio Slone is free of fines? 36,470.00 ftz 14,810.00 ft2 40.6% % 1.00 in 3.00 in 0.13 inthr ,0.04 ft'/sec 0.00 ft'/sec -0.04 ft'/sec 3,039.00 ft' 3,664.00 ft' ff' Its fe Bradu Loamy Sand OK for non -SR waters 4.50 in/hr 2652 fmsl 0.40 days OK 48.00 in 270.00 ft 1 Gravel 0.4 Y (Yor N) OK Form SW401-Infiltration Trench-Rev.4 Parts I. 8 II. Design Summary, Page t of 2 Trench Elevations Bottom elevation Storage/overflow elevation Top elevation Trench Dimensions Length (long dimension) Width (short dimension) Height (depth) Additional Information Maximum volume to each inlet into the trench? Length of vegetative filter for overflow Number of observation wells Distance to structure Distance from surface waters Distance from water supply wells) Separation from impervious soil layer Depth of naturally oocuting soil above SHWr Bottom covered with 4-in of dean sand? Proposed drainage easement provided? Capures all runoff at ultimate build -out? Bypass provided for larger storms? Trench wrapped with geotextile fall Pretreatment device provided 279.40 fmd 282.90 fmsl 285.15 fmsl 270.00 . it 7.00 ft 6.75 it 0.84 aGn NA it 35.00 it 1,500.00 it 5,000.00 it NA it 30.00 it Y .. (YorN) .NA (Y or N) -. -Y (Y or N) Y (Y or N) Y (YorN) 1121 OK OK OK OK OK OK OK OK OK OK OK OK OK OK Permit No. SW6 //69/05 (fo be provided by Qt4/Q) Form SW401-Infiltration Trench-Rev.4 Pans I. & II. Design Summary, Page 2 of 2 Permit (to be provided by DWQ) Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will result in a request for additional information. This will delay final review and approval of the project Initial in the space provided to indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a requirement has not been met, attach justification. Page/ Plan Initials Sheet No. CG801 1. Plans (1' - 50' or larger) of the entire site showing: - Design at ultimate build -out, - Off -site drainage (if applicable), - Delineated drainage basins (include Rational C coefficient per basin), - Trench dimensions, - Pretreatment system, - High Bow bypass system, - Maintenance access, - Proposed drainage easement and public right of way (ROW), - Overflow device, and - Boundaries of drainage easement. CG sheets 2. Partial plan (1' = 30' or larger) and details for the infiltration trench showing: / - Bypass structure, - Maintenance access, - Basin bottom dimensions, - Basin cross-section with benchmark for sediment cleanout, - Flow distribution detail for inflow, Vegetated filter, and - Pretreatment device. CG301/502 3. Section view of the infiltration trench (1' = 20' or larger) showing: - Pretreatment and treatment areas, and -Inlet and outlet structures. CG801 4. A table of elevations, areas, incremental volumes & accumulated volumes to verify the volume provided. Soils Report 5. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. The results of the soils report must be verified in the field by DWO, by completing & submitting the soils investigation request form. County soil maps are not an acceptable source of soils information. CG700-711 6. A construction sequence that shows how the infiltration basin will be protected from sediment until the //JJ�� entire drainage area is stabilized. �/ /� Cates 7. The supporting calculations. 0&M 8. A copy of the signed and notarized operation and maintenance (0&M) agreement. N� NA 9. A copy of the deed restrictions (if required). Form SW40LInfiltration Trench-Rev.4 Part III. Required Items Checklist, Page 1 of 1 Permit NoUW% 1 1 0 l0 5 (to be provided by DWQ) ipH ®CA�O OY'KA NCDENR STORMWATER MANAGEMENT PERMIT APPLICATION FORM ° 401 CERTIFICATION APPLICATION FORM INFILTRATION TRENCH SUPPLEMENT This form must be filled out, printed and submitted. The Required Items Checklist (Pad 111) must be printed, filled out and submitted along with all of the required information. Project name Fort Bragg SOF Operators Additions Contact person John Peterson Phone number 501-372-2900 Date .12/22/2010 Drainage area number 3 ' I Ito DESIGNIINF.ORMATIO EN Site Characteristics Drainage area 13.506.00 ftz Impervious area 13,500.00 ryz ovNmtCtr�oii Percent impervious 100.0°h % ono``' , ,•, �V��i,, Design rainfall depth '1;g0 in �O: V_ % Peak Flow Calculations'' 1-yr, 24-hr rainfall depth 3.00 ' in 0 1-yr, 24-hr intensity 0.13 iNhr Pre -development 1-yr, 24-hrdischarge 0.03 ft'/sec %v0.•F�`aG-r Post -development 1-yr, 24-hrdischarge 0.00;:' 1 NE;k•' it /sec•'•••.r•••c PrelPost 1-yr, 24-hr peak flow control -0.03 ft'/sec '"niyrgUnrnPlltCiiW``0��"p Storage Volume: Non -SA Waters Minimum volume required ,2,673.00 it' Volume provided 2,881.00' . R' OK for ron-SR waters Storage Volume: SA Waters 1.5' runoff volume ry' Pre -development l-yr,24-hrrunoffvolume •' .ry' Post -development 1-yr, 24-hr runoff volumes Minimum volume required to Volume provided to Soils Report Summary Soil type Bragg Sand Infiltration rate "4.507. in/hr SHWT elevation ''. 265:00' "' fmsl Trench Design Parameters Drawdown time - ..0.72, days OK Perforated pipe diameter 60.00 ' in Perforated pipe length „%40.00 it Number of laterals 2- Stone type (if used) Gravel Stone void ratio 0.4 Stone is free of fines? - Y (Y or N) OK Form SW401-Infiltration Trench -Rev 4 Parts 1. & 11. Design Summary, Page t of 2 Permit No. S54) 6 ll of o 5 (to be provided by D WD) Trench Elevations Bottom elevation 289.25 frost OK Storage/overlowelevation 295:71 fmsl Top elevation 297,00, fast Trench Dimensions Length (long dimension) . 40.00. it Width (short dimension) 20.00-' .i ft Height (depth) 7.75 ft OK Additional Infomration Maximum volume to each inlet into the trench? 0.31.1: ac-in OK Length of vegetative filter for overflow :NA •_-'.d.•ft OK Number of observation wells .1 OK Distance to structure 15.00 ft OK Distance from surface waters 1,500.00 it OK Distance from water supply well(s) 5,000.00.-. it OK Separation from impervious soil layer .' NA .. it OK Depth of naturally occurring soil above SHWr 35.00 ft OK Bottom covered with 4-in of dean sand? Y (Y or N) OK Proposed drainage easement provided? NA (Y or N) OK Captures all runoff at ultimate buld-out? Y,- (Y or N) OK Bypass provided for larger storms? :Y ., (Y or N) OK Trench wrapped with geotexlile fabric? Y (Y or N) OK Pretreatment device provided VEGETATIVE SURFACE Farm SW401-Infiltration Trench -Rev 4 Parts I. & 11. Design Summary, Page 2 of 2 Permit No. Seyaa//O/Oj (to be provided by DWQ) Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will result in a request for additional information. This will delay final review and approval of the project Initial in the space provided to indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a requirement has not been met, attach justification. Pagel Plan Initials Sheet No. p/ /� CG801 �P 1. Plans (1' - 50' or larger) of the entire site showing: - Design at ultimate build -out, - Off -site drainage (if applicable), - Delineated drainage basins (include Rational C coefficient per basin), - Trench dimensions, - Pretreatment system, - High flow bypass system, - Maintenance access, - Proposed drainage easement and public right of way (ROV), - Overflow device, and - Boundaries of drainage easement. CG sheets 2. Partial plan (1' = 30' or larger) and details for the infiltration trench showing: - Bypass structure, - Maintenance access, - Basin bottom dimensions, - Basin cross-section with benchmark for sediment cleanout, - Flow distribution detail for inflow, - Vegetated filter, and - Pretreatment device. CG3011502 3. Section view of the infiltration trench (1' = 20' or larger) showing: - Pretreatment and treatment areas, and - Inlet and outlet structures. CG801 4. A table of elevations, areas, incremental volumes & accumulated volumes to verify the volume provided. Soils Report 5. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. The results of the soils report must be verified in the field by ONO, by completing & submitting the soils investigation request form. County soil maps are not an acceptable source of soils information. CG700-711 6. A construction sequence that shows how the infiltration basin will be protected from sediment until the entire drainage area is stabilized. Calcs 7. The supporting calculations. 0&M 8. A copy of the signed and notarized operation and maintenance (0&M) agreement. NA 9. A copy of the deed restrictions (if required). Form SW401-Infiltration Trench-Rev.4 Part III. Required Items Checklist, Page 1 of 1