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Home My WebLink AboutSW8120509_COMPLIANCE_20130910STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW oA/7iD�t DOC TYPE ❑ CURRENT PERMIT ❑ APPROVED PLANS ❑ HISTORICAL FILE COMPLIANCE EVALUATION INSPECTION DOC DATE �Y21/� YYYYMMDD Compliance Inspection Report Permit SW8120509 Effective 05/30/12 Expiration 05/30/20 Owner Commanding Officer Marine Corps Base Camp Leleune Project NICOE SAT Clinic County Onslow Hospital Corps Blvd Region Wilmington Camp Leleune NC 28547 Contact Person Neal Paul Title Deputy Public Works Offic Phone 910-451-2212 Directions to Project From main gate head south on Holcomb Blvd right toward Brewster, turn right on Brewster, right on Hospdal Corps Blvd , site is approx 0 30 miles on left Type of Project State Stormwater - HD - Infiltration Drain Areas 1 - 2- On-Site Representative(s) Related Permits Inspection Date 09/10/2013 EntryTime 12 00 PM Primary Inspector Brian P Lambe Secondary Inspector(s) Reason for Inspection Routine Permit Inspection Type State Stormwater Facility Status ❑ Compliant ■ Not Compliant Question Areas State Stormwater (See attachment summary) Exit Time 12 30 PM Phone Inspection Type Compliance Evaluation Page 1 Permit SW8120509 Owner - Project Commanding Officer Marine Corps Base Camp Lejeune Inspection Date 09/10/2013 Inspection Type Compliance Evaluation Reason for Visit Routine Inspection Summary In order to bring this system into compliance remove all sediment in the basins and provide certification that the system Is working as approved Operation and Maintenance Yes No NA NE Are the SW measures being maintained and operated as per the permit requirements ❑ ■ ❑ ❑ Are the SW BMP inspection and maintenance records complete and available for review or provided to DWQ ❑ ■ ❑ ❑ upon request? Comment Infiltration basin 1 and 2 have accumilated sediment and must be removed Page 2 HYDRAULIC CONDUCTIVITY STUDY NICOE Date 327123IM2 WeetherCondllon Sunny Location BB Temperalure (F) 70 Number K9 Hereon E Icrin inches Depth(Inches) so SET UP Target Water Level 127 so em inches Beginning Water Level 140 65 Hole Depth (cm) 152 6 w7t, Ending Water Level 140 55 Reference (cm) + 12 7 5 0 Hand (cm) - 12 7 5 Or, CHT Tubes) setting - 15 2 6 Hole diameter (cm) 5 0 Hole radius (r) 25 cm Valve Setting xs` coefficient A 0001292 1 ON 2 ON NOTE Readings based an Ending Water Level Coversion Factor (C F) 1050 Water Reading change to water level Chamber C F clock hme min Elapsed Time minr O cm3lhr K cmlhr K mfir -. LL �St 90 85 105 0 3"0 ' 300 0 050 178500 265204 104411 # 22 2; 7 8 1050 $ 0 � 300 0 050 163800 2A 3364 95812 ��14 6 74 1050 9 0�033 + 300 0 050 15540 0 230883 90899 a'E7�4' 74 106 0 t1 00 300 0 050 156400 230883 90899 Div � OX, _+ ' 74 1060 w_15 0 .+ 1 300 0 050 156400 230883 908 Final Ksat 23 088 9 020 HYDRAULIC CONDUCTIVITY STUDY NICOE Date 3127123/28/12 Mother Condition Sunny Location B10 Temperature(F) 70 Number K10 Horizon E1 lem Inches DepthQnches) 100 S• U Targat Water Level 166 66 cm inches I Beginning Water Level 127 50 Hole Depth (cm) Reference (cm) 254 + 140 10 0 4 5 5,3 Ending Water Level 127 50 Heed (cm) 185 55 CHT Tube(s) setting = 22 8 9 Hole diameter (cm) 5 0 - Valve Setting 1 ON 2 ON Coverskon Factor (C F) i05 0 Hole radius (r) 2 5 cm coefficient A 0 0014BB NOTE Readings based on Ending Water Level Water Reading change in water level Chamber C F clock time (min) Elapsed Time min O (cm3lhr) K (cmJhr K knlhr s 35 M1q. Fi�lr f 31 5 r 35 1050 2 0 200 0 033 110260 183802 64489 28 5 30 1050 4`0i 200 4 033 94600 140402 55278 25 2 33 1050 6'a 200 0 033 103960 154442 80804 22 32 1050 B O 200 0 033 100800 14 9762 68992 18" 30 1050 1040 200 0 033 9450 0 140402 55276 16� yt s y 30 1050 12 0 200 0 033 94500 140402 55275 13 (` 30 1050 14 0 200 0 033 94600 140402 65276 Final Ksat 14 040 5 528 I- Y MAY 2 4 2(112 INFILTRATION BASIN ANALYSIS FOR PHASE it AND 2008 PROJECTS Formula¢ FILENAME S IVYQSIexcel spreadsheetsllNBASIN1120509 " -I User in ut PROJECT NUMBER SWB 120509 Current Date 30 May-12 PROJECT NAME NICOE SAT Clinic Original Run Date 30 May 12 DRAINAGE BASIN White Oak I REVIEWER C Baker RECEIVING STREAM Northeast Creek CLASS SC,HQW, NSW Index No 19 16 (3 5) 1 If ORW, is site within the 575' AEC7 Y N RULES ("2008" or "Ph2") 2008 (use a comma (') before entering 2008) PROJECTAREA 52 acres Overall DA 64914 Sf `1 49 acres 64914 sf (reduce overall DA by prevlously_permitted BUA amount DA for Proposed BUA 1 sf (assume DA = previously permitted BUA) DA for Prev Permitted BUA IMPERVIOUS AREA CALCULATION _ Previously BUILDINGS PARKING/ASPHALT CONCRETE OFFSITE OTHER / FUTURE Overall % IMPERVIOUS, 1= New BUA % impervious = Ex BUA % impervious VOLUME CALCULATION Previously permitted BUA Desig Previously permitted BUA volum 1 yr 24 hour predpitation depth (inches Predevelopment C value from consults 1 yr 24 hr Pre development volume 1 yr 24 hr Post development votume 1 5" volume for New BUA 2008 Design Volume Phase 2 Design Volume SURFACE AREAS / ELEVATIO BOTTOM TOP/BYPASS VOLUME PROVIDED 12462 75 SOILS INFORMATION ELEVATION OF SEASONA SOILTYPE REPORTED INFILTRATION Time to Draw Down Pro BUA 25 4 10 � -62 r0 Storm C value �, U 95 095 095 CC= 0 69 = a Pre Rv Post Rv ` 0 05 o fit 1,005 061 DD5 �=��oos 1 50 ini '= 0 Cf -dt' , cubic feet :-0� � cubic feet &B., �.o cubic feet 1988` i cubic feet i988' cubic feet NSIVOLUMES Elev (ft Area, s ft Inc Volume Acc Volume 1600 7,356 1600 7,3564 c 0 t ro 1600 7,356 '0 _ x- 0 17 50 91261 2463 ¢ 1} - - 12463 cf (most like!y I* or 15 from NOAA chart does not include exrs 1 50 ini '= 0 Cf -dt' , cubic feet :-0� � cubic feet &B., �.o cubic feet 1988` i cubic feet i988' cubic feet NSIVOLUMES Elev (ft Area, s ft Inc Volume Acc Volume 1600 7,356 1600 7,3564 c 0 t ro 1600 7,356 '0 _ x- 0 17 50 91261 2463 ¢ 1} - - 12463 cf (most like!y I* or 15 from NOAA chart does not include exrs cf (most like!y I* or 15 from NOAA chart does not include exrs 10 YEAR STORM (WAIVE BYPASS & VFS) Runoff depth for 10 yr 24 hr storm, inches Volume of 10 yr 24 hr storm = Volume Infiltrated in 24 hours = Remaining volume to store = from NOAA chart # 0r CF 72309 CF, at T=1 day, V= (2 x k x A) -72309 CIF OK? YES ;" INFILTRATION BASIN ANALYSIS FOR PHASE II AND 2008 PROJECTS Formula FILENAME 81WClSlexcel.spreadsheefMINBASIN11205N �, x "' user Input PROJECT NUMBER SW8 12GS09 I Current Date 30 May 12 PROJECT NAME NICOE SAT Clinic Original Run Date 30 May-12 DRAINAGE BASIN White Oak I REVIEWER C Baker RECEIVING STREAM Northeast Creek CLASS ISC,HQW, NSW Index No 19 16 (3 5} 1 If ORW, is site within the 575' AEC? Y N RULES ("2008" or "Ph2") 2008 (Use a comma ( ) before entering 2008) PROJECT AREA 5 2 acres Overall DA 87320 Sf = 2 ool acres DA for Proposed BUA 87320 sf reduce overall DA by previously permitted BUA amount) DA for Prev Permitted BUA sf (assume DA = previously permitted BUA) 1 IMPERVIOUS AREA CALCULATION i?'revl&uaIv. Prop BUA BUAzat Jiff=Ds C value BUILDINGS 53616 p n1 PARKING/ASPHALT 4. CONCRETE 4254 ` z _ "� 0 95 OFFSITE 0 95 OTHER / FUTURE 1955 095 Subtotals �t 59825 0 Cc= Total ti- , ?,V-5982s Overall % IMPERVIOUS, I= F 68 s% New BUA % impervious = W6B Sx Ex BUA % impervious = 0 0% VOLUME CALCULATION Previously permitted BUA Design Storm Previously permitted BUA volume 1 yr 24 hour precipitation depth (inches) Predevelopment C value from consultant 1 yr 24 hr Pre development volume 1 yr 24 hr Post development volume 1 5" volume for New BUA 2008 Design Volume Phase 2 Design Volume SURFACE AREAS I ELEVATIONS I VOLUMES 0 05 a 0 05—' `" 0 05 'z inches E o cf 150 -j`.54611 cubicfeet cubic feet 7276- cubic feet '�W276r Z cubic feet i2763 ` cubic feet i I BOTTOM Eiev ft Area, s ft Inc Volume Acc Volume 1350 7,700 1350 7,700 0 77 1350 7,700 r0 '41- -k0 15 50 10,904 ` 1860W- i tI8604 TOP/BYPASS VOLUME PROVIDED .18604 00 cf SOILS INFORMATION ELEVATION OF SEASONAL SOIL TYPE REPORTED INFILTRATION Time to Draw Down I' or 15 from NOAA chart i does not include exis HIGH WATER TABLE 115 fmsl ba meade RATE 377 In/hr W 30 , hours 10 YEAR STORM (WAIVE BYPASS & VFS) Runoff depth for 10 yr 24 hr storm Inches Volume of 10 yr 24 hr storm = Volume Infiltrated in 24 hours = Remaining volume to store = from NOAA chart _ 4 _ CIF _ 29029 �' CF, at T=1 day, V= (2 x k x A) 29029_ CIF OK? IYES