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Home My WebLink AboutWPO201700007 Plan - Stream Buffer Mitigation 2017-03-24MITIGATION PLAN FOR fLANNIGAN BRANCH CROSSING I MP 04800-00-00-05200 ALBEMARLE COUNTY, VIRGINIA 1IN VICINITY MAP SCALE: 1 2,000' PLAN NOTES: Owner: Ellen C Ham)ton, Trustee of the Piedmont Manor Land Trust RR1 Box 730 Roseland VA, 22967 Source of Boundary and Topography: Albemarle County CIS Project Location: Tax Map 48 Parcel 52 This pian shows mitgation for disturbance in the stream buffer. Culverts have been sized based on the contributing drainage areas and are shown for reference. Contractor is responsible for proper installation of the culverts based on field conditions. Contractor shall not disturb more than 10,000 square feet. SHEET INDEX SHEET C I - COVED SHEET SHEET C2 - CULVERT DRAINAGE DIVIDE SHEET C3 - STREAM CRO55ING MITIGATION SHEET C4 - CULVERT 51ZI NG AND DETAI L5 EXISTING CONDITIONS SCALE: 1"=200' = CRITICAL SLOPES • 0 CTS t(? U ` z Z �Z �Z �W w� Zs o °(n Z D N a � N (� N W Q V) MW F J J_ i Z W �o L' 0 N 0 U o � JUSTIN M. SHIMP > Kic. 45f83 S'SjONAL I 0 Date 12/29/2016 Scale 1 "=200' Sheet No. C1 OF 4 File No. 16.058 Drainage Divide � Overland Flow Direction 300 0 300 600 90 Scale: 1 "=300' o�'�� OP �r JUS N M. SxIMP %NAL N 0 N iugIlc to r&{ttpfi ncNy PU-1mint raid' jet,..x`3114 €x..`n( as ga ;. `. Nz% PRIWMatiyo4 om"I C in thc urfi..r 4kma. Aphic:zwt w; 3 Foot,(; {;fit 11. For evirpp1q, 400 sgijsl):t ft,-K)f V11 � ".� if,(Ali':43.1;1hc� r,of, q: f,,g ph'iE�p�{;::a5�&>®�g;� ry �j3gcahu:I ,{k. v't SYb,�Ea: ..43.i�.eF t�i:.{tA# -°.: i:� t. .f�. ��:�;reril 6 'k.:.:t Sad htti.g t, 5,�3.c��,n.( F s_' Er`eC- "�u'rIIjak `.... "$ c� 11)C ' iIr V, I �"='l,w3��1,� 4, f ?n t'. Vol-cg«vry a_ arc or 11wfhoa fh rti;of,fpiWt$m� 1�, 2 a��a$ �aa�'tds IVi,E�$+� sdFrUYga Vie, J'�"� �:, vvw� 6nI y, �8(.+i6::IJ:T t.`'k :. Tit r.f' % t13:!::'tt3.t: {x1t X'S 371i 3a';a9t° ; rixtKn i x .£ plaim &, . in,'-wa,' ft'oe 41 ��r�.;xP- lyi? "t^Y �1 C1M 4 N " 3 t i` X� u ;E ir' e t;t,t�` � �.s3C� @* at:� . :€��x . I E � 4 n x 4 g t ti tt7+ Eft& 5 ' l . c. CU!I"r<'t' 1 1t pn"o rei 1,1 r'e, i,?t". Inallix. . �9.. 111 sc-T"'�`t '.seta #� #.I r 9.gft :i :Ctsa'sBtd t s lreaix7vt in tbc! , dev-i" t{ €k'�a. s1�; hr i$:z ,"a.9r G.. �$ 9C£; a' t. t8 9� y`;.3.°'`knl xtltt-ctioll for el, ,h .)J # x��ri opnoll.s W-6111: 1nchl-s3oa. €3t 111,t Thollia's eff .,soq Sofl ;uld X41.0. : _o'nst4v�atioa 1_ tSkr[iet. ( jSkN-T: Fa sef3nPI-tit '>'€, 1'� kl,, or, a"11011 -Int .,wd to 'Fun "j,tt "t glle 8,911 SE TOTAL DISTURBED AREA rl x Landscape Schedule Planting Type Botanical Name Common Name Minimum Planting Requirements Quantity Canopy Tree Quercus falcata Southern Red Oak 1.5" - 2" Caliper g Understory Tree Acer buergerianum Trident Maple .75" - 1.5" Caliper 9 Small Shrub viburnum x pragense Prague Viburnum 15"-18" Height 4 Small Shrub Cornus racemosa Gray Dogwood 15"-18" Height 5 Total: 27 Note: Species May be Substituted. See Sheet C4 for typical planting details. Contractor shall begin planting after earthwork is finished and shall complete plantings within 6 months. Trees and shrubs, or seedlings if chosen, shall be planted according to best practices as specified by the USDA. MITIGATION OPTION 1 REQUIREMENTS: 9 CANOPY TREES 9 UNDERSTORY TREES 9 SHRUBS MITIGATION PANTING AREAS: 3,570 SF Disturbed Stream Buffer 7,140 SF 2:1 Ratio Required Replanting Area 7,500 SF Available Replanting Area CULVERT NOTES: 1. Contractor shall install pipes in accordance with manufacture specifications. 2. Minimum covers listed on Sheet C4 are for purposes of obtaining clear passage of a 10—year storm event. Provide the 2' specified cover or cover required by manufacture, whichever is greater. 3. Crossing 1 shall be installed in accordance with requirements and specifications of USACE Nationwide Permit #18 for work in an intermittent stream. • • b • 100 150 L■ Scale:- A&II110111111111 ------- i I • �� i Cly lI O v JU. 7TIN M. SHIMP (Lie/No, 45I83 %�SJOINFAL ��`� Crossing 1 A E L 291.5 Ac 880 ft 4900 ft 0.455 sq mi ! 0.93 mi Southern Piedmont Regression Equations Storm Multiple -Parameter Drainage -Area -Only Drainage -Area -Only Q2 0 881 0.310 0.423 21.6A ' 0.635 122A ( ) r✓ 122 0.635 , (A ) 74.0 cf s Q10I 0.848 0.379 38.8AE-0.430 268, 6 cfs " , 0.596 335A ( ) 209.6 cfs Qts 54.8Ao.852Eo.392L 0.463 414.0 cfs 74,3Ao.ssoEa.39oL 0.495 504(A)O'5s1 i 319.2 cfs Q510 74.3A0.860E0.390L 0.495 % 551.7 cfs cfs 661(A)o.570 422.2 cfs Q1oo 0 869 0.382 529 1010 E L-0. I 707,1 cfs 4. - 849 A 0,559 ( ) 547.0 cfs Crossing 2 A E I L 85.2 Ac I 1050 ft 3200 ft 0.133 sq rni 0.61 mi /?I')i5 Southern Piedmont Regression Equations Storml Multiple -Parameter Drainage -Area -Only Q2 0.881E0.310L 0.423 '" 21.{Ai 39.0 cfs 0.635 122A ( ) t 33, 9 cfs Q110 38.8A0.848Eo.379L 0.430 1 '121.5 cfs 335(A)°'596 100.7 cfs Q2!5 54.8Ao.852Eo.392L 0.463 189,5 cfs 504(A)o.5s1 156.2 cfs Q510 74,3Ao.ssoEa.39oL 0.495 253.4 cfs 661(A)o.570 209.4 cfs Q1100 0869 0.382 0.529 101,4 " E L 1325.4 cfs 849 A 0.559 ( ) ?. 275.0 cfs NOT TO SCALE Chapter g- Culverts CULVERT SIZING Appendix 8C-1 Inlet Control„ Circular Concrete 3Do (ft) d (in) Crossing 1 CHART 8.0 1 9.0 - 180 IO,D00 29.0 4.0 12.0 158 8,000 EXAMPLE (2) (3) i56 6(190 0:02 i.'... P., trod 6' - g, alxro�> 144 5.000 -6'- 4,MG Y!p 132 can 3,000 0 Ila z.s ax 4. - 120 cel zl v. 4, 2,Ma im z.x T -r 4: -- 3 468 `"¢ 96 ,060 3. Boa 94 ---' 600-R.-- -2."-- .. 500 Cross. 1 72 400 - 300- x - 60- - n 54 V 9a Cross. 2 a i V a �2 v 69 50 HW ENTRANCE � 1.9 I'D SCALE 1.0 40 D TYPE w �" b6 L 3a ;11 9q+era 0090 .ern � - .9 .9 � Pa lel Q i ro 87 s r.la,a 1 ID -24 6 Te uaa aoelr ifei er 131 9r.1.. 26 3 n.rl,onlarl, ,r� aaafe tl), ma. u Itc19 P.t ilarllnaa Ilne vnraagn 4 9 2 - - - 15 5 B 92 HEADWATER DEPTH FOR HEADWATER 5 GALES 21B3 CONCRETE PIPE CULVERTS DEVISED MAY *$ WITH INLET CONTROL Note: Crossing 1 Shall have 2 culverts, so the total flow is halved per_-_cuIvert. 270 CFS,'' Use (2) 48" Culverts, Quo each 135 cfs Crossing' 2:' "Q10 - 122 CFS; Use (1y) 48" Culvert Culverts to be installed with 2' min. cover. Calculations assume Inlet Control only and that Tailwater Effects are minimal given channel conditions. CULVERT SIZING NOMOGRAPHS NOT TO SCALE 3d o (MIN.) SEE PLANS FOR EXACT LAYOUT. SPACE PLANTS AS SPECIFIED IN PLANT LIST OR AS SHOWN. ADJUST SPACING AS NECESSARY OR AS DIRECTED BY 'IPE OUTLET TO WELL LANDSCAPE ARCHITECT. )EFINED CHANNEL MULCH 2" DEEP IMMEDIATELY AFTER u r d SECTION A -A FILTER CLOTH KEY IN 6"-9"; RECOMMENDED FOR ENTIRE PERIMETER TOTES: 1. APRON LINING MAY BE RIPRAP, GROUTED RIPRAP, GABION BASKET, OR CONCRETE. 2. La IS THE LENGTH OF THE RIPRAP APRON AS CALCULATED USING PLATES 3.18-3 AND 3.18-4. 3. d = 1.5 TIMES THE MAXIMUM STONE DIAMETER, BUT NOT LESS THAN 6 INCHES. WN Not To Scale Note: Since Crossing 1 shall have 2 culverts, the velocity of water flowing thrcugh the outlet is dependent on the culvert size. (2) 48" pipes are used, so the flow through each is 135 cfs. This dictates an outlet prosection length of 33'. Since there are 2 culverts, the width of outlet prosection has been doubled. PLANTING AND WATER THOP,OUGHLY. PLANTING PIT. PREPARED SOIL FOR SHRUBS SOIL SURFACE ROUGHENED TO BIND NEW SOIL iy aM^ i,sro { $`, gacc x C )°' s sem.a'-a, a a j®j_ # a � � � gad j ¢} � �+» 7�1 gy � r, �d"� deg jr r d F HH PS s&{pCj� :tv R.;h igr 9 i.:. 8 i5. Y.#. ?�, ly - Crosssing 1: Pipe Diameter = 48" Q10 = 135 cfs tI L5° 33' a Crosssing 2: . Pipe Diameter = 48" Q10 = 122 cfs d50 = 12" L,=29' h72 BALL . L7IA:.IVllfq:. OUTLET PROTECT ON NOMOGRAPH C4 Not To, Scale SET TRUNK PLUMB. SEE PLANS FOR EXACT LAYOUT AND SPACING. TREE TIES, SEE SPE SET SHRUB PLUMB. TOP OF 1-1/2" SQ. OAK STAN ROOTBALL SHALL NOT BE MORE SET 180 DEGREES THAN I" ABOVE FINISHED GRADE APART REMOVE BURLAP FROM FINISHED GRADE TOP 1/3 OF ROOTBALL APPLY 2" OF MULCF 3" TALL WATERING PLANTING AND WA7 BERM THOROUGHLY FII\IISHED GRADE 4" COMPACTED EAF WATERING BERM 1 EXISTING GRADE w Q > ('*'0_5� _SHRUB PLANTING DETAIL Not To Scale PLANTING PIT. SEE EXACT REQUIREME PLANTING SOIL, AN[ SOIL AMENDMENTS REMOVE BURLAP & FROM TOP 1/3 OF R BALL UNDISTURBED SOIL 2 USDA SDS PLATE 3,18-3 I (_6 TREE PLANTING DETAIL C4 Not To Scale 0 LO 0 c� ro� � JU M. SHtImp > Lie. No.145 t 83 7 1P 411' ofk SIONAI- 06` La (ft) Do (ft) 3Do (ft) d (in) Crossing 1 33.0 8.0 24.0 9.0 Crossing 2 29.0 4.0 12.0 10.0 WN Not To Scale Note: Since Crossing 1 shall have 2 culverts, the velocity of water flowing thrcugh the outlet is dependent on the culvert size. (2) 48" pipes are used, so the flow through each is 135 cfs. This dictates an outlet prosection length of 33'. Since there are 2 culverts, the width of outlet prosection has been doubled. PLANTING AND WATER THOP,OUGHLY. PLANTING PIT. PREPARED SOIL FOR SHRUBS SOIL SURFACE ROUGHENED TO BIND NEW SOIL iy aM^ i,sro { $`, gacc x C )°' s sem.a'-a, a a j®j_ # a � � � gad j ¢} � �+» 7�1 gy � r, �d"� deg jr r d F HH PS s&{pCj� :tv R.;h igr 9 i.:. 8 i5. Y.#. ?�, ly - Crosssing 1: Pipe Diameter = 48" Q10 = 135 cfs tI L5° 33' a Crosssing 2: . Pipe Diameter = 48" Q10 = 122 cfs d50 = 12" L,=29' h72 BALL . L7IA:.IVllfq:. OUTLET PROTECT ON NOMOGRAPH C4 Not To, Scale SET TRUNK PLUMB. SEE PLANS FOR EXACT LAYOUT AND SPACING. TREE TIES, SEE SPE SET SHRUB PLUMB. TOP OF 1-1/2" SQ. OAK STAN ROOTBALL SHALL NOT BE MORE SET 180 DEGREES THAN I" ABOVE FINISHED GRADE APART REMOVE BURLAP FROM FINISHED GRADE TOP 1/3 OF ROOTBALL APPLY 2" OF MULCF 3" TALL WATERING PLANTING AND WA7 BERM THOROUGHLY FII\IISHED GRADE 4" COMPACTED EAF WATERING BERM 1 EXISTING GRADE w Q > ('*'0_5� _SHRUB PLANTING DETAIL Not To Scale PLANTING PIT. SEE EXACT REQUIREME PLANTING SOIL, AN[ SOIL AMENDMENTS REMOVE BURLAP & FROM TOP 1/3 OF R BALL UNDISTURBED SOIL 2 USDA SDS PLATE 3,18-3 I (_6 TREE PLANTING DETAIL C4 Not To Scale 0 LO 0 c� ro� � JU M. SHtImp > Lie. No.145 t 83 7 1P 411' ofk SIONAI- 06`