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HomeMy WebLinkAbout2018-06-19 Stormwater Report Plans etc. 6-5-2018 1 \\Vhb\proj\Wat-LD\11625.16 Merrimack Park!ng\cad\Id\Eng\Stormwater\11625,16 Drainage Areas_EX.dwg ! iI Legend SYMBOLS II ._.. . . SU I II DESIGN POINT .. 4 I. I lit) II DRAINAGE AREA DESIGNATION 2.s€, psi "C Y X '7 :. -A' l ,:....-.., 1. }. \-:'i.-...... ,.. : .. .. ,.. l .. .•�]' l ice... '� �" �, F5 ` r � I I I I I .!, -.. -.... -y - +{� � IIIIYYY � ,wr r�i ,� .,� ~ �+ /'� •SI:� � � r , POND 1111 l.1 i I'd I I I I I I I 111 1 I 1 I310A LINETYPES C - �� j f I I'i'3-r< � �c'/ v/y \ �III�I/z ;,I4(,��''%-rI,I/',,yii i,i,i iir-��ir�•/�oii,i i/iI v�i/iiiii/iIi iiii� ii��;I���I fir.; �f r� II� I ��o��� I 1 I 1�€�`�11�€�€t'-r�_�;r�4 v { DRAIN AGE AREA I BOUNDARY / TIME OF CONCENT RATION FLOW LINE O � SOIL TYPE BOUNDARY yI`!�IVr S j �,,,..;, «� OO' BUFFER ZONE ............. , 4-220 [ .rA : 7 / -. l ly V A �/ S \ - l _- �•- \V .J1 - �� f�iii. i "!:L' `,'rv //�, WETLAND BOUNDARY € \ f \ � I ]JI SCS SOIL CLASSIFICATIONS t! r )+r r WOODBRIDGE FINE SANDY - ... 7OA LOAM, HSG C D } 1 J. I y j r ; i rl 1 /1 I /, I S � l y 9 1 p r ! JRIDGEBURY FINE SANDY LOAM, HSG D t"P �\• .'..1��j, '..-:,Z�'I°'1l \ ,-'4 f OA ppf/ i J \ I h I , • ` \�I �Tv......_ ��. ,\ .., y - � t"'K� � 4. . - .Ii%/iiiiiiv f ..A\\\\ ` _fr..�� /iivivi/iiJ/ii I I P-IA-1 r l--, �') !!� i 1 - I rl! �+ L •\ 1 Existing Drainage Conditions Figure 2a 0 50 100 20OFeet Campus Parking Improvements 06/OS/2018 North Andover, MA Closed-Drainage System Hydraulic Analysis Proposed Conditions: Merrimack College Campus Parking Improvements, North Andover, MA 25-Year Sturm went Stop Upstream Upstream System CA Upstream System System Diameter Sloe Capacity Velocity Length Elevation EGL In HGL In Invert Elevation EGL Out HGL Out p P y p Y � ( } ( ) (Out) (Out) Invert Headloss Start Node Inlet Area Inlet Tc Intensity Rational Manning's n (Design) Ground Ground Node Inlet C (acres) (acres} (hours) (in/h) Flow(cfs) (in) (ft/ft} (cfs) (ft/s} Oft} (Start)(ft) (ft} (ft} (Start)(ft) (Stop)(ft) (ft} (ft} (stop}(ft} (ft) AD-4 DMH-3 (N/A) (N/A) 0 0.083 6.016 0 0.011 12 0.011 4.32 0 14.3 235.4 232.32 232.32 232.05 236.9 232.32 232.32 231.9 0 DMH-7 DMH-8 (N/A) (N/A) 2.784 0 5.677 15.93 0.011 24 0.01 26.92 8.93 74 235.3 230.76 230.09 228.65 234.6 230.16 229.73 227.9 0.36 DMH-8 DMH-9 (N/A) (N/A) 2.996 0 5.649 17.06 0.011 24 0.009 25.9 8.8 85.2 234.6 230.11 22939 227.9 233.9 229.49 229,02 227.1 0.37 DMH-2 DMH-3 (N/A) (N/A) 2.213 0 5.796 12.93 0.011 24 0.009 26.05 8.28 84,2 236.9 233.46 232.89 231.6 236.9 232.71 232.32 230.8 0.58 CB-1 WQU-1 0.47 0.657 0.309 0.083 6.004 1.87 0.011 12 0.016 5.36 6.21 12.3 237.5 234.82 234.58 234 237.8 234.71 234.25 233.8 0.33 DICB-1 WQU-1 0.531 0.669 0.355 0.083 6.004 2.15 0.011 15 0.023 11.68 7.26 134.5 240.2 237.31 237.08 236.5 237.8 234.41 234.34 233.35 2.74 AD-6 DMH-7 0.678 0.279 0.189 0.083 . 6.004 1,14 0.011 12 0.01 4.29 4.62 14.5 233.E 230.87 230.7 230.25 235.3 230.77 230.47 230.1 0.23 AD-7 DMH-8 0.587 0.362 0.212 0.083 6.004 1.29 0.011 12 0,011 4.39 4.86 13.8 232.9 230.22 230.03 229.55 234.6 230.11 229.79 229.4 0.24 AD-8 DMH-9 0.603 0.666 0.402 0.083 6.004 2.43 0.011 12 0.01 4.15 5.49 15.5 232.2 229.81 229.52 228.85 233.9 229.7 229.27 228.7 0.24 EXRD-2 DMH-3 0.9 0.227 0.204 0.083 6.004 1.24 0.013 12 0.012 3.83 4.35 60.4 238 232.95 232.77 232.3 236.9 232.38 232.32 231.6 0.45 WQU-1 DMH-1 (N/A) (N/A) 0.664 0 5.942 3.98 0.011 15 0.006 6.1 5.3 31.3 237.8 234.37 234.17 233.1 237,95 234.29 234.13 232.9 0.04 DMH-1 DMH-2 (N/A) (N/A) 1.205 0 5.852 7.11 0.011 18 0.01 12.69 7.39 124.3 237.95 234.4 233.93 232.9 236.9 233.4 233.15 231.6 0.78 EXRD-1 DMH-1 (N/A) 0.465 0.541 0.083 5.947 3.25 0.013 12 0.009 3.44 4.13 118.2 240.2 235.37 235.11 234 237.95 234.39 234.13 232.9 0.98 EXAD-1 EXRD-1 0.389 0349 0.136 0.083 6.004 0.82 0.01 8 0.012 1.69 4.81 82 237.5 235.62 235.43 235 240.2 235.26 235.17 234.05 0.26 DMH-6 DMH-7 (N/A) (N/A) 2.595 0 5.698 14.9 0.011 24 0.01 26.54 8.69 55.8 235.85 231.23 230.59 229.2 235.3 230.81 230.41 228.65 0.18 AD-2 AD-1 0.494 0.32 0.158 0.083 6.004 0.96 0.011 10 0.01 2.58 4.37 75.7 237.55 235.61 235.43 235 237.55 235.03 234.98 234.25 0.46 AD-1 DMH-2 0563 0.315 0.335 0.083 5.946 2.01 0.011 10 0.01 2.56 5.2 51 237.55 235.2 234.89 234,25 236.9 234.73 234.31 233.75 0,58 DMH-9 CB-2 (N/A) (N/A) 3.398 0 5.617 19.24 0.011 24 0.009 24.81 8.72 104.5 233.9 229.49 228.68 227.1 231.6 228.73 228.13 226.2 0.55 CB-2 CB-3 0.5 0.161 3.629 0.083 5.577 20.4 0.011 24 0.03 46.57 14.34 105,5 231.6 228.69 227.82 226.2 227.8 225.64 224.98 223 2.84 CB-3 CB-4 0.475 0.671 4.16 0.083 5552 23.28 0.011 24 0.031 116.79 14.87 94.7 227.8 225.74 224.71 .223 225.5 222.97 222.12 220.1 2.6 CB-4 DMH-10 0.393 0.525 4.366 0.083 5.531 24.34 0.011 30 0.004 29.69 6.75 80 225.5 22253 221.82 220.1 224 222.23 221.48 2-19.8 0.34 DMH-10 DMH-11 (N/A) (N/A) 4.366 0 5.492 24.17 0.011 30 0.01 49.13 9.97 34.1 224 221.77 221.02 219.35 223,5 221.56 220.38 219 0.65 EXCB-2 CB-2 0.591 0.078 0.046 0.083 6.004 0.28 0.013 12 0.011 3.66 2.75 123.2 232.6 228.15 228.13 227.8 231.6 228.13 228.13 226.5 0 EXCB•1 CB-2 0.381 0.275 0.105 0.083 6.004 0.63 0.013 12 0,01 3.6 3.45 88.1 232.2 228.17 228.16 227.3 231.6 228.14 228.13 226.4 0.03 EXAD-3 CB-3 0.506 0.1 0.051 0.083 6.004 0.31 0.01 12 0.01 4.64 3.34 1193 2X9 227.31 227.23 227 227.8 226.15 225.97 225.8 1.25 EXRD-3 CB-3 0,9 0,179 0.161 0.083 6.004 0.97 0.013 12 0.01 3.62 3.91 92 231.2 227,32 227.16 226,75 227.8 226.39 226.15 225.8 1.01 AD-5 DMH-5 0.672 0.264 0.177 0.083 6.004 1.07 0.011 12 0.034 7.73 6.92 20.8 234.3 231.55 231.39 230.95 235 230.9 230.81 230.25 0.58 DMH-5 DMH-6 (N/A) (N/A) 0.177 0 5.994 1.07 0.011 12 0.032 7.59 1.36 9.2 235 230.79 230.76 229.5 : 235.85 230.79 230.76 229.2 0.01 DMH-3 DMH-4 (N/A) (N/A) 2.417 0 5.762 14.04 0.011 24 0.01 26.99 8.68 73.6 236.9 232.75 232.15 230.8 236.5 232.03 231.55 230.05 0.59 DMH-4 DMH-6 (N/A) (N/A) 2.417 0 5.734 13.97 0.011 24 0.009 26.06 8.44 89.5 236.5 232 231.4 230.05 235.85 231.2 230.76 229.2 0.64 AD-3 DMH-2 0.716 0.939 0.672 0.083 6.004 4.07 0.011 12 0.011 4.35 5.18 14.1 235.4 233.7 233.28 232.05 236.9 233.57 233.15 231.9 0.13 i i I \\yh1)\Proj\Wat4D\11625.16 Merrimack Parking\cad\Id\Eng\Stormwater\11625.16 Drainage Areas_PR.dwg Legend r l\"' 1y: Il I II1f 1, ,- I ,) I\ \ . '�. ' ,',✓ � �11` Y SYMBOLS - j , _ ,rr r Ir j'll \ r II I DESIGN POINT ado 3 .77 All f ♦ \ �' } D DRAINAGE AREA 6S 43 3S - I j ' ,1�; f ` DESIGNATION r � \ 55 I / I 2S ' ; \ \ 1 I ;i \ r \ v B3 B2 ;► B1h \ . B5 r } j B4 POND _ I `l i i \ ! ! / I�i�.r il" 'fi n /i n J'7J}lir I ! F /iiiriiiivi iii rir 'I LINETYPES firV i � rl i I1 r /� v 'iii A �f <%if�iiiiir, I � r;r,l l �•� J<`' r:c, DRAINAGE AREA JI l � ti" lair, �i �• ,� ' !I � BOUNDARY r I TIME OF CONCENTRATION ,17 FLOW� ��,- 9 '' � }i4 • ' �I I �/ j � �\, iiiviiio/. °'fGG'F�,r LINE 000 SOIL TYPE BOUNDARY 7QA I 1 SOS I 100 BUFFER ZONE -22a 4-2,9 WETLAND BOUNDARY ll 11\ \ � _ I i�i,r, 310A <} I 1 Ir ") 1 +) [' SCS SOIL CLASSIFICATIONS i ! 4 Alj r { q i ti 11`lI WOODBRIDGE FINE SANDY M r LOA C/ HSG D �= r i i � 1111 �,ref r \\\\�y` A I V1 i nr ! E SANDY 70A ', .r v Y; , � r � �y, v / { r'./i� �t,)j' LOAM,E HSG D ry I�ID RY FIN fr r a ;1 r,,.,.:.: r f f' )•,,.,,,.- --,I ..:, - - , \ r - I%i�ri �f _ ,v •'V 1 I� 1 1 t iii/iirioiri i � � r I / \ n� .. ... w 1 x( � 1 Proposed Drainage Conditions Figure 2B 0 50 100 200Feet Campus Parking Improvements 06/05/2018 North Andover, MA 1\,h6l,,1,Wa1 WO1625.16+•1[ii—k Pit Fb1%1162516 TW fpit 1'1,,d,g TP APPROXIMATE LOCATION OF TEST PITS PERFORMED BY UTS OF MASSACHUSETTS _ MAY 2014. j r r TP APPROXIMATE LOCATION OF TEST PITS PERFORMED BY VHS — MAY 2018. r r r � IS 7W7 —2 TT TTT .s' \ i 1 r r. I } , r }y 11 i AHERIVE AVE ti l \ ;. >, 1». .! .. 5!. , - ;.f• _ , � r ; .i .� ' S I:I; y � S( � � � I i�/iriiiiiiii/iiiriiuiiiiii/iiiaiiiiiiiiiiiiii/riiliiirir �� ,�q � ,,1 :- :..�_ .. ..... � I E I, .,, /1:,,t �1 1 ♦ ,.,.i.��/ �`>, Al " 0)' A �I f TP-6 ` FIX /iripiiiiUiiiriiniiiiii/ \V �11` .� � j� .1... �'-...; �111 r�� rl ,;; ' ::. // •,1�'. I .�i,tiJ �y �%% '.i11�1 ////////�/3l':s.� I y -`.... �-` '�... � - ll \N.. y4l TP—5 --` '1 +`s•t 1+ `I '-' \ �\ y ....1\ - _ Ii�ifii//ii//i///////////iiri��r/////////�%i��� -�\ l \\\ ti . ' ' l i IF E 1 P r ._ ,R � / /" �Y��I • ,,t l I ll \ \\ �r..\� 1 � �� '1 f � i I � \\ I _ _ _ � E r ! M h ` II Test Pit Location Plan - Figure 1 ...........0 40 80 160Feet Campus Parking Improvements 0 Merrimack College Source: UTS Geotechnical Report and Field Measurements Prepared for: Stormwater Report 11b Date: 05/14/2018 Merrimack College -- Campus Parking Improvements, North Andover, Massachusetts Long Term Best Management Practices — Maintenance/ Evaluation Checklist Best Management Inspection Frequency Date Inspector Minimum Maintenance and Key Stems #o Check Cleaning/Repair Needed Date of Practice Inspected Dyes Ono (List Items) Cleaning/Repair Performed by In accordance with Remove sediment from sediment storage facility (per manufacturer's ❑Y �] manufacturer's recommendations guidelines) no Structural Water es but no less than twice a year Quality Devices following installation and no less Remove oil and floatables in the oil/inspection port(per manufacturer's guidelines) than once a year thereafter. Deep Sump and Four times per year . Clean accumulated sand and sediment whenever the depth of deposits is Hooded Catch basins greater than or equal to one half the depth from the bottom of the invert ❑Yes Ono and Area Drains of the lowest pipe in the basin; • Floatables Twice during the first year and . Weeds and invasive plant species shall be removed by hand ❑yes Ono annual thereafter . Lead litter and other detritus shall be removed twice per year • If needed to maintain aesthetic appearance, perennial plantings may be trimmed at the and of the growing season Binretention Basins . Trees and shrubs should be inspected twice per year to evaluate health and attended to as necessary • Inspect filter strip for sediment buildup • Inspect overflow structure and underdrain connections annual to ensure that they are functioning, Storrnwater Control Manager VM1VW-%VkL0111625.16 P,Wvwk Psh.'v�'.rfgorlAS;ortnwadVyperd[6• SIA dw4CWP1- M-Wa!0[oU9gS LTPPP412,LaV Term SNIP 11Y.Ieae T."o doc ' | | � ( � � , � | / | ' � � , ,r� r�ll JL N. 'A 7TAD AD '77— CB CB LEGEND CATCH BASIN AREA DRAIN IfAll WATER QUALITY UNIT POTENTIAL SNOW STORAGE CB 1H CS)s LOCATION BIORETENTION BASIN fIN SNOW SHALL NOT BE STORED IN WETLAND RESOURCE AREAS It V OR BIORETENTION BASIN. t ALL EXCESS SNOW SHALL BE TRUCKED TO PARKING LOT STORAGE AREA, On | — StnnnvvaterBK4PLocation Plan Figure DI | � Campus Parking Improvements � Merrimack College May 0 40 80 Feet . i No�hAndover, assac.uoe�s ' � Merrimack College — Campus Parking Improvements, North Andover, Massachusetts Construction Best Management Practices — Maintenance/ Evaluation Checklist Inspection Date Minimum Maintenance and Ke Cleaning/Re Best Management Practice Inspector Y g pair Needed Date of Frequency Inspected p Items to Check ❑yes ❑no (Last Items) Cleaning/Repair Performed by: In accordance with Accumulated sediment Straw Bales/Silt Fencing NPDES CGP • Separation of straw bales with the earth ❑yes [:]no and each other • Damaged or broken straw bales/silt fence In accordance with • Accumulated sediment Gravel Construction Entrance NPDES CGP « Tracking of sediment outside limit of work ❑yes [:]no In accordance with • Accumulated sediment within silt sacks Catch Basin Protection NPDES CGP Rips or torn silt sacks ❑ es na Y ❑ In accordance with « Cracking, Diversion Channels NPDES CGP Erosion, ❑yes [:]no • Leakage in the embankments In accordance with • Cracking, Temporary Sedimentation NPDES CGP Erosion, ❑yes Ono Basins Leakage in the embankments • Accumulation of sediment In accordance with • Cracking, Vegetated Slope Stabilization NPDES CGP • Erosion ❑yes Ono I Stormwater Control Manager Y'.rh6`pay',N'�LGH 1625.161.!erlmack Partingmpots".$lormwa!�Agxndx F• S!andard SComV"A Cc Stftxmn Parwd Idan!enncdF2•CUnr!ructbn Parlad OPP IA anlenaGe T�x'e do: FIR / I i Af rye .�-�� r•!.�r �.C,<�j� ♦r� � r ♦�Irl J �.� � ������h� i � � � - ' '� USr lr r tlr:r \ r`r11r r k f•C.-.r ,�, 5^� - 1 - Jr x ` J rr- 1% 51\ti 1 _.-r 4 r. �` ^." y `�/ \� / `I ` !'•� A! 4 •� rkrrir � � r - '°wry J r �.�' 6 crow � ./ � ' Ar• r i i/��Jrrr i-r-5 -�� r ,� I � r ,�'" F• rr rIi%HI�11\� `f i �r� .'/ f r - r �-.. 320/acres 7 � ♦ ~rr IIt _f' �f `,^_ / .f !. _ /; f `�\•�� ', r" - � a ((( �r� /r Jr 1`f�^k�`` _���f ar f��r �r�`r � ram,..: •5r�,.. 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