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Home My WebLink AboutSW5120101_Drainage/BUA Info_20130410T fywp,/� TDx? 77 SW,5-1 2- 0 ) 6 1 tl g C) DRAINAGE AREA 2, L/ 250,824SF DRAINAGE AREA 1 221,566 SF NN 0- 106EI P 14 h -W A -b h4�Y �� ,''/! ! ` ` )&IJ ja A EX EXI BUA BUA J.. gle!FeN EX BUA,, 0 7- —7 A7 L a • v 0�• nw \A 'a \Vj I___N -'N I Ell, A Al 470 - if [ - - -- it- N p B I S� 4T Dkslit 7k/ � -------------- 48 a J� fl kir '485 Ik 11N iz-G/t DITCFII__� 87- 1130 Z02 UL— — O -13 0 nop 0 Piz, TOTAL PROJECT AREA: 485,020 SF 11.13 AC 76,136 SF: 1.75 AC OF PREVIOUSLY IMPERVIOUS AREA 173 436 SF : 3.98 AC OF IMPERVIOUS AREA AFTER CONSTRUCTION NET INCREASE OF IMPERVIOUS SURFACE IS 97,300 SF : 2.23 AC STORMWATER INFORMATION PROJECT IS BROKEN INTO TWO MAIN BASINS. BASIN I TO SOUTH OF GRAVEL ROAD HAS: BIORETENTION BASIN #1 GRASS SWALE #2 BASIN 2 TO NORTH OF GRAVEL ROAD HAS: GRASS SWALE #3 & #4 (PARALLEL) -> BIORETENTION BASIN #2 -> LEVEL SPREADER J4 ANNEX AT ANOTHER LOCATION. IMPACTS TO BE OFFSET USING TREATMENT AT THE MAIN SITE BASINS, J p " rij RllsF1 N1.1 -21 -7 _j E-OF DEM 7 - - - - - - - - - - - - z: .At Im I 'A 1, rA_L I Ft- 7:7 I Vk --------- 0 ♦ N, NO WETLANDS IN PROJECT AREA. NO DRAINAGE EASEMENTS IN PROJECT AREA. PROPERTY OWNED BY STATE OF NC. 2366 ACRES. BOUNDARY NOT AVAILABLE. PRE -POST DATA FOR IYR-24HR STORM BASIN I : Q-PRE : 7.13 CFS Q-POST : 3.56 CFS W1 BMIP BASIN 2 : Q-PRE : 4.30 CFS Q-POST : 2.33 CFS W/ BMP J4 ANNEX: Q-PRE : 0.06 CFS Q-POST : 0.26 CFS PROJECT TOTAL : Q-PRE : 7.13 + 4.30 + 0.06 = 11.49 CFS Q.-POST : 3.56 + 2.33 + 0.26 = 6.14 CFS STORMWATER CALCULATIONS AND BASIN SIZING TAKE INTO ACCOUNT FUTURE IMPERVIOUS FROM DEVELOPMENT MASTER PLAN. - NUTRIENT EXPORT DATA: PROJECT WIDE LBS/ACRE 4__ PRE -NITROGEN: 2.78 2625 SF FROM J4-ANNEX SITE IS TREATED IN POST -NITROGEN: 2.69 THE BIORETENTION BASINS SHOWN ABOVE, ALLOWABLE: 2.20 AMOUNT OVER: 0.49 PRE -PHOSPHORUS: 0.71 POST -PHOSPHORUS: 0.55 ALLOWABLE: 0.33 BASINS WERE SIZED TO INCLUDE THE EXISTING IMPERVIOUS AREAS WITHIN THE DRAINAGE AREAS SHOWN ABOVE. AMOUNT OVER: 0.22 ENGINEERING C I I __.j 3220 GLEN ROYAL RD. RALEIGH, NC 27617 TELE 919.788.0224 FAX 919-788.0232 NC LICENSE #P-0189 NC NATIONAL GUARD Camp Butner Training Center 539 Roberts Chapel Road Butner, NC 27509 Bud et Code 121021131, Itern# PN 1 11 -12 SCUM 11-08915-01A CH E: AS1 101 5Q 0 25 .5.Q 3.00 sea[/signature hell, 9 i Q-6f Jac."&• • Imz 02• lop Ql&• issued for date Construction Document 09102/2011 item date A DWQ REVISION 02/03/2012 CANTONMENT MODULAR UNIT RELOCATIONS key plan sheet title DWQ INFORMATION sheet number DWQ1 v", drawn by EMT checked by TRH WHEN PLOTTED AT FULL SIZE THIS SHEET MEASURES 24'x36" ✓tea S InI --rl z ° 1 ° l 11 `` , 3v) % 7 IU,34/ N fiMP1!71ouS aid / s_ lv- vy G'�OG EX BUA4ROAD) 27,800 NE\&t-Impervious Parkine Lot ° 490-// // �o�/' T Fa- / f9/ / 1 _-C//L DITCH- ---�—� /L DITCH PLAN SHOWS PRE AND POST IMPERVIOUS AREAS AS REQUESTED FOR DWQ REVIEW LEGEND PATTERN USED FOR NEW IMPERVIOUS SURFACE PATTERN USED FOR EXISTING IMPERVIOUS SURFACE ENGINEERING []I I 'Aftl&. 3220 GLEN ROYAL RD. RALEIGH, NC 27617 TELE 919.788.0224 FAX 919.788.0232 NC LICENSE #P-0189 NC NATIONAL GUARD Camp Butner Training Center 539 Roberts Chapel Road Butner, NC 27509 Bud et Code 12102B1, Item# PN1 11-12 SCCY#: 11-08915-01 A CHE: AS1101 50 0 25 54 100 seal/signature c A I?��ii •�L 028912 1111111 Issued for date Construction Document 09/02/2011 it m tlz DWQ Info date 11/10/2011 CANTONMENT MODULAR UNIT RELOCATIONS key plan sheet title MAP OF PRE & POST IMPERVIOUS sheet number DWQ2 drawn by EMT checked by TRH WHEN PLOTTED AT FULL SIZE THIS SHEET MEASURES 24`x38" f .. _ .... �.�r. .n •t r . I i� � � 1 'I 1 r•.l + •i'i � � + � .f �d � .� ,' -r 1 ! -_ f,l 1 � I+ ili.�l If��. I !: ... .. ... .. .3 .'• I - 1'. �,_ .... ..a .G.�l ,Yr,..;S•! .I i.11, 1 �i I.. rnq0 2 � bA / r7/7 ENGINEERING I►. 3220 GLEN ROYAL RD. RALEIGH, NC 27617 TELE 919.788.0224 FAX 919-788.0232 NC LICENSE 0.0189 NC NATIONAL GUARD Camp Butner Training Center 539 Roberts Chapel Road Butner, NC 27509 Buddet Code 12102B1, Item# PN1 11-12 SC#: 11-08915-01 A CHE: AS1101 seal/signature c A R�lrfi �. �• oFe i0 • :�. 43B992 . ', 0 4: {-2.7-IL �ifR•.....• rti issued for date Construction Document 09/02/2011 item date CANTONMENT MODULAR UNIT RELOCATIONS key plan sheet title MAP OF DRAINAGE BASINS AND SUB - BASINS sheet number /TT(1 drawn by EMT checked by TRH WHEN PLOTTED AT FULL SIZE THIS SHEET MEASURES 24"x36` �' � f� � • � r T l I I 1 1 .�I ! � I �' r � t� r + .{ � r �; r l ,. . .. .' - -' �. �. � _�_ r _ Wit. .-. ---- •--Js.. .'.oLL': _'!.t'_... '.''!1YS_i-r .�_., -.f I _... _. 0) 01 0 PER REQUIREMENTS FUTURE PLANNED DEVELOPMENT HAS BEEN INCORPORATED INTO THE BASIN SIZING AND CALCULATIONS. THIS DEVELOPMENT IS SHOWN ON THIS PAGE TO ILLUSTRATE TO REVIEWERS WHERE THE IMPERVIOUS AREA WILL BE. FUTURE BUILDING PADS ARE SHOWN BUT ARE IN ANOTHER DRAINAGE AREA THAT WILL RECEIVE ATTENTION WHEN THAT DEVELOPMENT TAKES PLACE. PROPOSED BMPS ALSO CAPTURE SOME EXISTING IMPERVIOUS AREAS THAT ARE UNTREATED. THESE EXISTING AREAS ARE USED IN THE CALCULATIONS AND SIZING. 1 (D LEGEND: PATTERNS ARE ROTATED AND SCALED TO REPRESENT SAME SURFACE IN DIFFERENT BASINS It SUBBASINS WOODED AREA TO REMAIN WOODED THROUGH FUTURE PROJECT ROADWAYS - INCLUDES EXISTING AND ITEMS 0o CONSTRUCTED IN THIS PROJECT PARKING LOT - INCLUDES FUTURE, PROPOSED AND EXISTING SIDEWALK - INCLUDES FUTURE, PROPOSED AND EXISTING OPEN AREA - MAINTAINED GRASS AREA OF PROPOSED BMP BUILDINGS - EXISTING AND PROPOSED mgfj"J�' -6bX l77 C f GINEERING 3220 GLEN ROYAL RD. RALEIGH, NC 27617 TELE 919.788.0224 FAX 919.788.0232 NC LICENSE 0-0189 NC NATIONAL GUARD Camp Butner Training Center 539 Roberts Chapel Road Butner, NC 27509 'ART Bud et Code 12102131, Item# PN1 11-12 SCCY#: 11-08915-01 A CHE: AS1101 seal/signature cASm '��i N. J* 0MV issued for date Construction Document 09/02/2011 item date CANTONMENT MODULAR UNIT RELOCATIONS IMPERVIOUS ITEMS IN EACH BASIN key plan sheet title sheet number DWQ4 ' . F r drawn by EMT checked by TRH WHEN PLOTTED AT FULL SIZE THIS SHEET MEASURES 24"x36'