Loading...
The URL can be used to link to this page
Your browser does not support the video tag.
Home
My WebLink
About
WPO202000028 Calculations 2020-10-22
SHIMP ENGINEERING, P.C. Design Focused Engineering October 22, 2020 County of Albemarle Department of Community Development 401 McIntire Road Charlottesville, VA 22902 Regarding: Regents School of Charlottesville — Stormwater Management Dear Reviewer, The purpose of this project is to develop a private school with multiple small buildings and a recreation area on what is currently undeveloped land off of Reservoir Road. The total area of disturbance is 8.76 acres. Runoff from the site is analyzed at two points, labeled POA A and POA B. Please see VSMP plan sheets C15 through C17 for the locations of these drainage areas and points of analysis. Point of Analysis A is a manmade channel leading to Moores Creek. Evidence that this channel is manmade is included in this packet. Please see the plans for Interstate 64 that call for relocation of a portion of existing stream to its current manmade location at POA A. A separate exhibit is also included showing the Regents School plans overlaid on 1-64 plans so the exact section of stream in question can be analyzed. Point of Analysis B is a natural channel that flows to Moores Creek. The drainage area to POA A was analyzed and found to be in compliance with channel protection requirements 9VAC25-870-66-B1a and flood protection requirements 9VAC25-870-66-C3a. Runoff from this drainage area is conveyed in a riprap channel to the manmade portion of stream mentioned above, where it is less than 1 % of the overall drainage area at that point. Sheet C17 shows the delineation of site runoff versus total drainage area to POA A. The drainage area to POA B was analyzed and found to be in compliance with channel protection requirement 9VAC25-870-66-B3a and flood protection requirements 9VAC25-870-66-C2b. An improvement factor of 0.8 was used in the energy balance equation. Due to regrading on the site, the drainage area to POA B is significantly smaller and flatter in the post -development conditions and has very little impervious area added. With no added stormwater detention or infiltration, the energy balance equation is satisfied. The post development 10 yr, 24 hr storm flow from the disturbed area of the site to POA B is less than in predevelopment conditions, satisfying flood protection requirements. The following table is a summary of the energy balance equation for POA B. Regents School Energy Balance Equation 1 yr, 24 hr Storm Qdeveloped= I.F.*tQpre-developed*RVpre-Developedi/RVdeveloped Qdeveloped= ((),forested* RVforested)/RVdeveloped Qpre-developed = 0.70 RVpre-Developed = 0.093 MaxQdevelopea = 0.70 cfs RVDeveloped = O.OSl Qdeveloped = 0.48 Cf5 912 E. High St. Charlottesville, VA 22902 1434.227.5140 1 shimp-engineenng.com PreDevelopment PosWevelopment 10 yr 1 5.98 cfs 3.25 cfs To satisfy water quality requirements set forth in 9VAC25-870-63, a combination of conserved open space and nutrient credit purchase will be utilized. The proposed Forest and Open Space / SWM Easement with this plan includes 5.43 acres. According to the VRRM New Development spreadsheet included in this packet, the remaining phosphorus load reduction required is 2.79 Ib/yr. Nutrient credits will be purchased to satisfy this requirement. Contents: Pre -Development Stormwater Management Calculations: Pre -Development HydroCAD Analysis Pre -Development Time of Concentration Calculations TOC Nomographs Post -Development Stormwater Management Calculations: Post -Development HydroCAD Analysis Post -Development Time of Concentration Calculations TOC Nomographs VDOT 1-64 Plan VDOT LD-347 (Al-A5) VDOT LD-347 (Al-A4A) VDOT LD-347 (Al-A3A) VDOT LD-347 (Al-A5) VDOT LD-347 (Al -Al X) VDOT LD-347 (Al -Al D) VDOT LD-347 (B1-B4) Point of Analysis A Exhibit (Manmade Channel) Nyloplast Drain Sizing Nomographs Stormwater Quality Calculations: VRRM New Development Spreadsheet Independent Reports: Excerpt from NRCS Soils Report NOAA Precipitation Report Pre -Development Stormwater Management Calculations Pre -Development HydroCAD Analysis Pre -Development Time of Concentration Calculations TOC Nomographs Drainage Area to POA B Sub4 Reach Aon Llnk PreDev POA B PreDev Type 11 24-hr 1 yr Rainfall=3.05" Prepared by {enter your company name here} Printed 8/3/2020 HvdroCADO 9.10 s/n 07054 © 2011 HvdroCAD Software Solutions LLC Paae 2 Time span=0.00-48.00 hrs, dt=0.05 hrs, 961 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1 S: Drainage Area to POA B Runoff Area=3.500 ac 0.00% Impervious Runoff Depth=0.32" Tc=17.9 min CN=59 Runoff=0.70 cfs 0.093 of Total Runoff Area = 3.500 ac Runoff Volume = 0.093 of Average Runoff Depth = 0.32" 100.00% Pervious = 3.500 ac 0.00% Impervious = 0.000 ac PreDev POA B PreDev Type 11 24-hr 1 yr Rainfall=3.05" Prepared by {enter your company name here} Printed 8/3/2020 HvdroCADO 9.10 s/n 07054 @ 2011 HvdroCAD Software Solutions LLC Paae 3 Summary for Subcatchment 1S: Drainage Area to POA B Runoff = 0.70 cfs @ 12.17 hrs, Volume= 0.093 af, Depth= 0.32" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type II 24-hr 1 yr Rainfall=3.05" Area (ac) CN Description 0.670 61 >75% Grass cover, Good, HSG B 2.830 58 Woods/grass comb., Good, HSG B 3.500 59 Weighted Average 3.500 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.9 Direct Entry, PreDev POA B PreDev Type 11 24-hr 10 yr Rainfall=5.57" Prepared by {enter your company name here} Printed 8/3/2020 HvdroCADO 9.10 s/n 07054 © 2011 HvdroCAD Software Solutions LLC Paae 4 Time span=0.00-48.00 hrs, dt=0.05 hrs, 961 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1 S: Drainage Area to POA B Runoff Area=3.500 ac 0.00% Impervious Runoff Depth=1.57" Tc=17.9 min CN=59 Runoff=5.98 cfs 0.458 of Total Runoff Area = 3.500 ac Runoff Volume = 0.458 of Average Runoff Depth = 1.57' 100.00% Pervious = 3.500 ac 0.00% Impervious = 0.000 ac PreDev POA B PreDev Type 11 24-hr 10 yr Rainfall=5.57" Prepared by {enter your company name here} Printed 8/3/2020 HvdroCADO 9.10 s/n 07054 @ 2011 HvdroCAD Software Solutions LLC Paae 5 Summary for Subcatchment 1S: Drainage Area to POA B Runoff = 5.98 cfs @ 12.12 hrs, Volume= 0.458 af, Depth= 1.57" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type II 24-hr 10 yr Rainfall=5.57" Area (ac) CN Description 0.670 61 >75% Grass cover, Good, HSG B 2.830 58 Woods/grass comb., Good, HSG B 3.500 59 Weighted Average 3.500 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.9 Direct Entry, Regents School of Charlottesville Pre -Development Time of Concentration Calculations POA B (Blue) 100 ft overland flow -turf 765 ft s. c. flow -wood 7.5% slope 0.33 C-value 12.0% slope 1.7 fps velocity 10.4 min. Seelye Chart 7.5 min. NEH Figure 15-4 17.9 min. f35 30 :v Paved y z 25 o .e 300 c� Bare u. 20 Cn w 200 Sol v \ Poor Grass U, z \surface U-.5 a w w Average = .4 z 75 0.5 w z _ U- Grass U 1.0 0 1 5 w zApF- _ 90 j \ ) 2® In a 80 Dense Grass \ a / z Cr 70 z \� z w a n 60 /� 10 o 0 50 20 d w v U 40 10 z U S C) 30 9 w z w z J 8 - 20 7 10 6 OVERLAND FLOW TIME (Seelye Chart) Source: Data Book for Civil Engineers, E.E. Seelye Plate 5-1 1.00 0.00 0.80 0.70 0.60 0.50 OAO 0.30 0.20 0.10 0.09 0.08 0.07 e 0.06 0.05 0.04 0.03 0.02 0.01 0.005 0 2 Ci Co c Io lc ti w c� o Velocity (Pt/s) Post -Development Stormwater Management Calculations Post -Development HydroCAD Analysis Post -Development Time of Concentration Calculations TOC Nomographs VDOT 1-64 Plan VDOT LD-347 (Al-A5) VDOT LD-347 (Al-A4A) VDOT LD-347 (Al-A3A) VDOT LD-347 (Al-A5) VDOT LD-347 (Al-A1X) VDOT LD-347 (Al -Al D) VDOT LD-347 (131-134) Point of Analysis A Exhibit (Manmade Channel) Nyloplast Drain Sizing Nomographs DA to POA B Sub4 Reach Aon Llnk PostDev POA B PostDev Type 11 24-hr 1 yr Rainfall=3.05" Prepared by {enter your company name here} Printed 8/3/2020 HvdroCADO 9.10 s/n 07054 © 2011 HvdroCAD Software Solutions LLC Paae 2 Time span=0.00-48.00 hrs, dt=0.05 hrs, 961 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method SubcatchmentlS: DA to POA B Runoff Area=1.603 ac 0.87% Impervious Runoff Depth=0.38" Tc=16.2 min CN=61 Runoff=0.48 cfs 0.051 of Total Runoff Area = 1.603 ac Runoff Volume = 0.051 of Average Runoff Depth = 0.38" 99.13% Pervious = 1.589 ac 0.87% Impervious = 0.014 ac PostDev POA B PostDev Type 11 24-hr 1 yr Rainfall=3.05" Prepared by {enter your company name here} Printed 8/3/2020 HvdroCADO 9.10 s/n 07054 @ 2011 HvdroCAD Software Solutions LLC Paae 3 Summary for Subcatchment 1S: DA to POA B Runoff = 0.48 cfs @ 12.13 hrs, Volume= 0.051 af, Depth= 0.38" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type II 24-hr 1 yr Rainfall=3.05" Area (ac) CN Description 0.014 98 1.589 61 >75% Grass cover, Good, HSG B 1.603 61 Weighted Average 1.589 99.13% Pervious Area 0.014 0.87% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 16.2 Direct Entry, PostDev POA B PostDev Type 11 24-hr 10 yr Rainfall=5.57" Prepared by {enter your company name here} Printed 8/3/2020 HvdroCADO 9.10 s/n 07054 © 2011 HvdroCAD Software Solutions LLC Paae 4 Time span=0.00-48.00 hrs, dt=0.05 hrs, 961 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method SubcatchmentlS: DA to POA B Runoff Area=1.603 ac 0.87% Impervious Runoff Depth=1.72" Tc=16.2 min CN=61 Runoff=3.25 cfs 0.230 of Total Runoff Area = 1.603 ac Runoff Volume = 0.230 of Average Runoff Depth = 1.72' 99.13% Pervious = 1.589 ac 0.87% Impervious = 0.014 ac PostDev POA B PostDev Type 11 24-hr 10 yr Rainfall=5.57" Prepared by {enter your company name here} Printed 8/3/2020 HvdroCADO 9.10 s/n 07054 @ 2011 HvdroCAD Software Solutions LLC Paae 5 Summary for Subcatchment 1S: DA to POA B Runoff = 3.25 cfs @ 12.10 hrs, Volume= 0.230 af, Depth= 1.72" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type II 24-hr 10 yr Rainfall=5.57" Area (ac) CN Description 0.014 98 1.589 61 >75% Grass cover, Good, HSG B 1.603 61 Weighted Average 1.589 99.13% Pervious Area 0.014 0.87% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 16.2 Direct Entry, Regents School of Charlottesville Post -Development Time of Concentration Calculations POA B (Red) 100 ft overland flow -turf 1.0% slope 0.33 C-value 50 ft s. c. flow -turf 1.0% slope 0.7 fps velocity 15.0 min. Seelye Chart 1.2 min. NEH Figure 15-4 TOC 16.2 min. 35 30 :v Paved y z 25 o .e 300 c� Bare u. 20 Cn w 200 Sol v \ Poor Grass U, z \Surface U-.5 a w w Average = .4 z 0.5 w z U- Grass U o_ w z 90 a \ p 2® N / F a 80 Dense Grass \ a / r z o Cr 70 z \� 5.0 z n 60 /� 10 ¢ cr 0 50 20 a w v U 40 10 z U 2 30 9 w z w J z J � s 20 7 10 6 OVERLAND FLOW TIME (Seelye Chart) Source: Data Book for Civil Engineers, E.E. Seelye Plate 5-1 1.00 0.90 0.80 0.70 0.60 0.50 OAO 0.30 0.20 0.10 0.09 0.08 0.07 e 0.06 0.05 0.04 0.03 0.02 0.01 0.005 L 0 2 Velocity (Pt/s) f50 vf, A1N CC 7r .h O q U / x rYF.�S, 000 •- -- �i o tip' IV N-9� �/2 \ °' 2C ....:'... .. .. l... .... '. '. e.,.. •.. .. GibO .(i ?It `r .e ..r .. :'i r'. . .... t"i l: n'ryC. ..: i... r':. ... ., •.. ..... .. • ..-1.... F.. • ... r I ... .. f .. .. .. .. iiiC�•r°ii' SAT Tx. TiEU`rlrlr 110 CUMTRT1Ctfr-`s,t.. ----- ------ --- ---- --- - -- -- - --- - - --- -- -- L t i l ,,' 11 r,rli, C;*ij•�r �';7.-'i T1iAFt-IC: - 1 f, ,R- l.-C1 '1 C.7 i,i 1. l.t_ 1, (1.`, ,.l I r\ p! •1"'13 •'ii i ...e ) L.Irl �:.L/ i1•.,1;I..JJ i {.R,f'y' i 11c, ;3A!1Y 61 '11if, Ps. .`t.'';Lii l', 0C7!'lof, m$6 7- POxe.- << 1••s Or' e Pow'-,- Gd. v COiI>M/�S/O/V FO,P �OCp�%OI7 OJa S/Opa-' Ol:iYi�'� r /V PUB. ROAD STATE • FEDEHAL�-- STATE __- tOTAI ,n /}, /,-� , ' . �� Ti1E !�/SLJ/lLLY LpiG,y°io/y 9fiori 9io'er'ISI� -AEG/� ,/ "I �I REGION ROUTE _ :RWECT ROUTE PROTECT SHEET SHEETS Te/e_'%ho; %e Poles uoe; cf ! ! ii o Ie, e nr'%o. %e 0 a �' t 2 v N - r+%, �t 11-7AIOiCflf 'EGA _ _ - - - 9--- - II 1 IG a- f,Q t�' fi0 0 - �./ IRG I-64-261019 0064.-002-102 �4 11'oods P55' el °, - - -- ._. -- _ __-- - -- - / �f ( � VA. 64 4 \� fzD" N N�31,f3e. 5�^fDD �!_t, 5-D - - 24' �- F'`4'��1 W ,O � C i�64A2� 81 -1 iF . [, I-64-2 4 G-305; P-405 _ _ _- F I r 0,/IZ`w ' ForOefai/s9 5,ee5he-el Alb.. 2-dddr TI{ 0�' OPT 006a•0o2-102., PE 106 U .'��� - ,^ 1 CA, p r h INDEX OF QUADRANT SLEETS o ��j2• 24' `o• Et� ACc.`S3 2�0' ?t V�(v pl .,E: h o, 50 '-'`- ` ss ��n.� �) (� %� �e Consfru tedir� / �ON 10 • Aft 0067_ ri cJS/�� ti ra s -'�-- tG5'f� \ �o/7fractG-.305 ^�^^� Jt. I`rr� �, ` ..�•a;% PAX , '� r-'`• - -- --- -- "- � Barbed Wri•e � � P/1 � �.[' c� � Q ,r,G' x \\fJ�� f �� of �`6rHB -` '� _ p �"� /�Oyy,}b{// ; . ►a �5 !!.`Oo ; % �i i e ` \\ y '/JciS`C7" 2"y ✓ ,J`--_— / � ``v`4lf''5( , e 0f�}J. •< '� SJ,om� \ a(j' �/B 1 Io GnL, ,� r� Iot �'- r1� � Pf0 `" it < \ \:� �'d / i `r. (\•Pp^Q� ,15�'--aY�`.o+F 1 C° •�p� a '�\ \ 71;� �i 4 `h ts• o ' '�!/ +) 61 - - `X \ - - ✓.y��s �� .� 1 ,.,,,,•,;_ f`. L,V Q/ o'�' \ , \ ` /,/O' // "/(^//A:' ,JIv //\\yj..-. _. . n,� __- .. y ems=- ` Al �'' 9`'�` S•`� ',y; 5 JTj. < 00o t 1. oar q j,� \ \ %r l9 nJY� .. e/AV) / \ `\\ / o 1p \* Plr�e - Q _— g' � SN 1i Sjr�y �h15j� \ S,JEO �'lf �o •'tut ' ` \ a - _ 0 `?. 1 \\' .Cy `•�'4aX�'•�'yr //4- �\ �� 4' l7/l = — \ a `. \•.�}1 \ �Y U.O i" -. Q'• / ej' B 0 T�� F-Oyu-I(3) se7 look,�o�K\� + ��. ; _ \` _ ._- (� jf'Cp R /�. \�\ 'A + , -= - Q - jib S�= o tf J' END PROJ. 6029-002-Ih§IPE-101 C-501 � T FR q r 3vva11 , ��\� 1 BEC ,P. B•9PNE5/ � _ ._ : vC�� ^� ppol - 1 Na d - OD' STA. 554+00.00 TF pR }�\\\ 1 '� /� c� 6�'\ \c� _._- _ -- nN 5hB 'm/ d FE too co - _- R: QP �'� �nf'See ll 5y �1 13 --- - qr• LOOP B �db //P��t�F°fa�� o R Fed 4 /-Std.O./.-4&Reg'W' O 1 w j , �P O / 1 cA Oy: g� B4'-/8"RiveCu[i.Pegd(4'G'over) ... , S Q� �\ � Q •s6, --* ; / -- -._: __ --- �•'' i� f0o ryaods F x00• 1 /nt!/n:477.(oa;/nc!Dar` 47/0.79� 4 - ---�k\\\ h 1 __ \ -.-- - l \�\� 1, 7'-Std. PaYe'd FlumeCPG-. [P, V �. /// \ \, P t-Std. EnergyDissioafor(EG /J[Pe4 a' ISABEL A2 BA1rNES 1 I -----' a, '( OB25/ Pg 47 _ - >< �-_-�— p'4Cp �-- P -� �'�/ "" / "- ! � c� . r' 3 /-SfdO./.`(i,4.•Peq'd. H=3[_O., � D99 /44 /'q 3�/ -\ �scco ` -' %\` 0 `' / r � \ 7/' /8"PipeCu/t�Req'o'(S'Cover) ') n� �o / v/n:477.2aJ; !nciDuf47ro5d CU/'VE DATA -E.B.L. CUk'!/L' DATA - W.E' L. \ Fe G 'J - ' 0 3 " /�,S de17a'tva//CEW /).Peq'd d = D!°2/'57" P/: d = 5/0 2/'57,WA n Q' < x 0.' �N3g f) co 1 [>-77 /-� �ryyDissipar`orCTyroe2) D-L0&'/67° D = 1.07.3 ° I o-e r =25(G2 -�� 5 � - _ �' 0 ; �o .�eq � T = 2, 523. 99 , z /i p g O RFC __ _ �� : - r ✓ fi 8 i �� Fs� X �' O'-/.5" yoe G'u/v. /f'e� 4! L = 4, 705. 27 ' L = 4, 764. /6 ' of y J ,2 z5246.471 = 5 336. 4 7' �'o to 58 \ I / Cover)' / 30=Sfic'Prvet�'f/ur.:� !f'�^4J,Pe U 1 �, q % \ /-/&ov P. C. 5ta. 2352 1, 0? 90 5t7. 235'C f 02. 9/ 1 Gal \ y /_6Y-Z-/m//(E %QeQd. �/ \ v1 , 6i9 Q3� 4 1 // Bros/; P. ! 5Aa.. 2377 t26.69 P. 5fa. ?377-YL69 ZZ R.''� \ /\ 1 /B' i se �Q -J "OyG /n✓./rr•'4S3.B0;/nt!Our`••449.40• � •y,� ///i%�, Pi.Sfp O P% fo f'87.0? - d ICE ' �� w� �z / �\ LOOP 't "All r � 1 \ reoc,e c/,ff � n wx-� i 8� �3 0�'' Y..- cri �n. T,Q f i Woods �'30 �` 2P6o' J W e ' 0 02 e O. 20 �� , n1\10,��`` `� v,Pefe/ ences: c. onion Gbrr/ib/ L�ric.� F � ., � � 5t ' �� / HOMER G. - ,o�. '! -0 v s - For•Oenero/ Plan, See Sheet or 4-6. W. � a c> e/C.�EY j \ � ,\ � ._ .. f 1 o �� 1 \ N , For Alignment Do% See .5hee o. 4 -c. �` a ^ " r°��' Cf0• ` l p5 -p`� _" _ . 3 -d tiC7.. a, \t — _ For Profile Mori//ii/e, See Shee/ o. 4 -a. /-mod. Endno�/�EWa�)[F�Qd. � � �, c� f ,` G• -�� - -- `-� -'� 1 3 EB 5 C \ o Loca bns of Sho r Ctvr6i For Profile eeloa. ,Ple. 29, 5ee She No.4- G9'-r12"H,aeCu/ter.`- fo Co r`ro/ Fi%/ 5/0 Eros/on .. ,. P Jnv r•' 455/v0; V I r,+ Q '{` -- c, •��` % Q` 2 I Locat o 53atiorr rfa i`iol i Poem Profi% ,P4m /1�, 5ee Sheer 4-r 2`� - -c13 l3�' '�� \ ,o co. ?n �Q�% �, .,, z \ \ For Prof%/e Loop A, See Shee/ No. -s J7=Z"oipE4Brf,F��o!l'3`Lov II PC' \` O R : u o° �' �\ /V.B.L. P9� - 73Fc5'O Lr` it /' f' A ,[ fvr Profile ,Pam B o` 5ur Q 5ee heel /Ya 4-1 /rry /rr• ' 4-53. •F-6r /r/r. Dut: 41,1130 1 A \ e � �E9 - ) / `a 'I / � For Oa�`oi/s � Shops/o'er r bii� o for Profle Loop B ,15ee 'Sheef N0.4 u. • 1 P ,') [ y�'� �,• \ 3 armor Profi/e ,Pomp C, 5ee Sheet /Yo.4- /-Errergy OissioalhriTypellj d. , � OG c'�Q a Q. \ �ddd. /5(oArras r 1420 Z �\. _ - / R , \ sae 5hee o. .r S r Profi/e Loon C ,see Sheet N0..4 FotsrodAton: rq� fo,brt;AYrr yrorr Z35i/rJ •' - i °n /Llicraceous S%f Adv�uAr`e jl� G'� B C D Y %r 1=1 qYe Chorrne/ ,�elocf:>rNfl 3� 5 e ref A10. 4-cc. E \ D h . L 0 P C c�a G. , N `, « ,� gE 5 r 3 f For Prt/e Chorrne/�Pbc: "lYb= /' t/ /�1/:7or Sfruo/ur e Exepr/o /C. \\ F i �o \ 1 _ ee She t/Uo. 4-66. 14t\ y ,\g I�;s �,` 2k o l5 p.8 2q� P9 �8• �=T c�lv�Y,. 1✓In �1 ! r`H' P 6\ B[' S O ,� 1 ' -Y 9 c� o' p 8 e5 \ • ycf' , � 2 aF f3 / I ti y -- rnP� 0 �u �,. ` G oi \• t25 D" �� o��^ \ T \ /BAPNES t / It�\, `38 pcp V�p oc- �0 • .All p Gr •3 G. �5 / � y1 3j7� \r 'T �t T� er'' x/ N E 1,. , • G �9 /74 Axe& 8 �1 m� A ��. o � I on G v �' RA G - x 1 �.. c i — - sue_ Ei �'- T. ;rf� Box N G 75 �I • n i _ r d 60' Tr Vi Q! I ly ♦ /30 X, � /1 fl r 0 `r cQ --_ a�• a� _�� a �(• Q. , �\ V o s [ (l r �o y. r. f y 9,5 230 - gb 5 ' P o ��r° SOi; ykl Q \ Q ci� T`�G p 5 AIL �� nv- --z d 3 / Q Q' _ 0 i E n X 'o !o P '1 �% r f _ .................... h cG yr N„ �� a yLIMIT OF WORK - r'��/�(e aP \ %! I�° (�o \' -a \, j , , >, V�Pr T �2N�J x j l 5 r��w P�e� +49.75 pQ- pr•, r 3 h' S. �y�a r e , G e 1 STA. 21 1 Q� (.\16 i l0'' G - - F fQCn'' o c� n f r o s n OR \ 4 � P� r� o G .re A \ - �� , 5 \ er Al Note: All Fruif %tees Locoted �o A0 ; l �o� - - �.. �1n yll R S + e \ / ='�^ `'bo R4 p #,R /:�4BEL:' P BAPNES \ F� Q/ y.r A cin4 n �/ F OCATIO.. 1!tC ti Between Sto. 57/056 t$ Sta C ' />n Fiela + y J9e , ar1 iG►� J �� r (1 y 574t41 e (Re Rte.29) p6�en ��\ vl ods n ' cd �t{ sue+ N 1 ;yrPr - \ co Lying Right ✓5 e o t poi es . Are To Be Remov dai7d Des- Cow,- r 1�• � � n y . p••ao9 �''• (� ZG{3 / D y.1 r� ,�/ co �6 � �\ c�`^ { I Si N 5t0 yE�G r?q l � / �Q, co �� r'` f D ' � VE� n l '� 5 r _� �--- �� 3aJ2' froyed. Those Tr.:es Are To t3y ° ve s // ✓il i V. �. :I?9/� '9 "� x_ _;'-��� "�^� - r t r 5iao a � igh c� _ Be Remove an y •o x•R/ A /( i.l�£�\ \T�/ �i(� 0 rh' k,�'- \ /� 15� ,r x' /�5 / /" fto� /P/`,�- - -r�yWN - gi9nG, �� .`'� to .r Pr a GAR fd. fE- d Destroyed d As Soon As Possibe After Pr �Ql�g(dP \ R; yr- I SI �� \ `� �. Acres ��i„R✓4V-7. �;-_ �'' 'Pio __- The Controctor Actually 71 fl`�on \ E,��i C IE F r !� \ \\\\ j = r ��/ t T �x �V f 7B' PF ] Comm&nces Work. The _ ence p k / To G n ad \ \�� d i d 0• - �y E pit c . y / i ' NA' Y� \ \, i tf°� I \ . r �n/rt Po° 5vr yEpG �2 itGh 3, '\ �: _� 7 �_ \ Cost OF This Wo, s , 30 _ >` 1 W L/�n%ted 3c In- uded /n The Price r' d •l+�^' n%�>< a�P.,��l 0 \\ 4'i \\ •�l, � • '- � A `-�•� 2q• r }rt y_TST 5tcc1 � fe�' �-,• t� �- ' '�� • �� , ,P/ Cleorin � Grubbin n2 M e Eosern \p0.,�h \\fiEN oX,oJ 5 l0 • '� ,v �;, , F w� woods 4 9 ro r Gy/ O' - �� Litre Bid Fir r a a9k gfr \\ , oxd,�g DWi' r:t�5r f \\ " itcn tr �f`,7 .of free /1 rIP 0 re V �a9 `5'" �- f4'r� -• ,�y¢� \ • �` �t�` For Cor�tirruatron o�Corrgfruer`ion ' ,ram �i \ nono. E 2°� / r t T Inv `}2 ,G'4� J EoSer"P YOGA �\ o � ? 1'. �'� da•tui/s I A9.4 ; See Shaer` /Va 4 j1 fioP .P/fY jOnNG - EMI`}'� 4?, LIMIT .- ORK prom° A c �� O g`�` /l07 T�"` N� 5• �1 e 307 v �/ LIMIT 0. rgo . 64t f v /t/ofee: y 1n o P ,�/1y i lD (� �1 i+ Ppg o STA. I I + 0 0 00 4�S 0 e' /irr B� • . For Confiruotiorr o Coirs/`ruc>>`iorr ov 6pTz �e / p0 22 re5 0 /% /nd:^afe,9 Paste / 1F`crp/atirrE'nrrirreerbbQ W CULlErV f7V] v �cz ens Lines v�� oeygi/s> Lt%L. ; .>ea 9he�y`/Vo s' N s 0( i{1' ��' 8 3 AG U: ir�c/un�a'rig G?�rn`rfart G-.7C�5 ¢ PHOFBE IN Sf/E[P ?V19 - - �. o /oo zcd �, B 0 / S a 2j Ootfed Line Denofes L /inns of ErnbonkInerrf /,. q �'a Fancy �40' �' s - - D.B.Acre.3P Q >b'Ff /f/ t0[� .�(�' Scoff ,it Fret V Oa5hed Line Derro/`•es t1i 77 is of EXC47Vafivr. -ery Cc 1351mpe'I'l Tracing cNih 7341 . PLAN -INTERCHANGE NO. I 1 .. ..G _ m._u...L,; w,..i.�sdi.aW.rn•..�`_<MWIY'L _:_.: _ "' '•M 'J. v •. �'. � r c~ i . "u'..rr,•�M?+clw yl3r�,'i,I �Y �i2 ��'✓{liaA1:+:-YAbY.`rWi.yX'F137='.y'< .: :,. a.. .., �y �.:�3'.......n..,._.---. ._:•.s.,.-. ... ......_... _. ._.....-. .. _. c/ Regents School 1-G-347 Hydraulic Grade Line 0.012 SVudure Nu(1) (11 Water El..' E(2) (2) No (3) Co (4) to (5) S6) (6) (7) (n Junctlon toes HRH (19) InlSurfair Surlac¢ (20) Em) Flint (21) Vo (B) He (9) Q (10) Vi (11) Oi V. (12) H. (19) A le ig (14) He (15) µ (16) 1.3'H, (1]) OSHA (18) At 4119.63 200 1554 68.3 0.40% 0.2] 9.6 0.20 10.89 15.3 166.2 0.11 11 0.51 0l1 aW 046 0134 491 1 501.65 A2 MIlm 1.25 10.89 69.7 2.2 1.69 15.3 047 10.71 11.8 126.0 0l5 10 0.28 1.22 1.59 0.794 Lw 506'n 51500 A3 513.52 125 1031 60.7 234% I,Q 118 032 6.10 8.5 51] 0.39 12 0.17 0.71 0356 1]]9 515.30 517.30 AA 515M 125 6.10 WA 0.76% 0.41 8.5 0.17 1.82 9.0 16.5 0'" 12 0.19 0.61 0306 0311 Wool 519.50 AS 518.95 125 182 6].] 0.0T 0.05 9.0 0.04 0.W 0.0 0.0 0.W 0 0.W 0.' 005 0825 0.071 519.02 52125 'Ou0e1 WSE ie Oe1e0 ae the greater M ether Me calculate0 tellwater or Oe Mired Me, Height t0 K C11¢nt RIM 0.14 OK lim 0.13 OK 823 0.15 OK 2.00 0.15 OK am 0,03 OK 223 Regents School 1-G-347 Hydraulic Grade Line 0.012 SVUdure NY(1) (11 Water EI..' E(2) (2) No (3) Co (4) la (5) S6) (6) (7) (n Junctlon toes HRH (19) I¢ISuWater Surlae¢ (20) Em) Rl21) (21) Vo (B) He (9) Q (10) Vi (11) Oi V. (12) H. (19) A le ig (14) He (15) µ (16) 1XH, (1]) OSHA (18) At 4119.63 200 1554 68.3 0.40% 0.2] 9.6 1 0.20 10.89 15.3 166.2 0.11 11 0.51 0l1 0.92 046 0134 490.31 501.65 A2 M34m 1.25 10.89 69.7 2.42°e 1.69 15.3 047 10.71 11.8 126.0 0l5 10 0.28 1.22 1.59 0.794 2.483 506'n 51500 A3 513.52 125 1031 60.7 234% I,Q 118 032 6.10 8.5 51] 0.39 12 0.17 0.71 0356 1]]9 515.30 517.30 m 515M 1.25 6.10 WA 0.76% 0.41 8.5 0en 1.46 4.5 6.6 0.11 69 0.19 0.84 0.422 0.828 516.13 519.50 A4a 516.13 125 1A6 36.1 O.M% 0.02 4.5 0.01 0.W 0.0 0.0 her 0 0.' 0.01 0.005 0.r20 516.15 518.10 'Ou0e1 WSF ie Iie col w 1M greater M either Me ,aIcoatool ecliener Or Me Imed Mll, Height 10 K Crack RIM 0.14 OK lim 0.13 OK 823 0.15 OK 2.00 0.59 OK 3T 0,03 OK 1.0 Regents School 1-G-347 Hydraulic Grade Line 0.012 SVUdure NY(1) (11 Water sufac,El.., E(2) (2) No (3) Co (4) la (5) S6) (6) (7) (n Junctlon tcee HRH (19) I¢Iel Water Surlae¢ (20) Em) Flint (21) Vo (B) He (9) Q (10) Vi (11) Oi V. (12) H. (19) A le ig (14) He (15) µ (16) 1.3'H, (1]) OSHA (18) At 4119.63 200 1554 68.3 0.40% 0.2] 9.6 0.20 10.89 15.3 166.2 0.11 11 0.51 0l1 aw 046 0134 491 1 501.65 A2 MIlm 1.25 10.89 69.7 2.2 1.69 15.3 047 10.71 11.8 126.0 0l5 10 0.28 1.22 1.59 0.794 Lw 506.11 51500 A3 513.52 125 1031 60.7 234% I,Q 118 1.46 in 5.5 9A 0.16 85 0.32 1.78 0889 2310 515.83 51730 Me 516M 125 133 204.9 0.06% 0.12 5.5 0.01 0.00 O.0 0.0 0.00 0 0.110 0.01 0.007 OAK 516.0 519.80 518.g5 125 1.82 6].] 0.0T 0.05 9.0 0,.0.W 0.0 0.0 0.W 0 000 004 005 0825 0.071 519.02 52125 'Ou11e1 WSE is IISIO az lM greaser M ¢i her Me calcoale0 tellim1er Or Me Mired Mll, Height 10 K Cher RIM 0.14 OK liffi 0.13 OK 823 O'm OK 1A] 0.03 OK 281 0,03 OK 223 Regents School 1-13-347 Hydmulic Goode Line n= o.01z Stmoum N.mNo (1) Oullel Water Suaace EIN.' (2) D. (3) Q. (4) to (5) Sm% (6) 14 (n JuncBon Loss RI H (19) InWWater $unace EI¢v. (29) RIM. FW (21) yo (B) He (9) Q (10) Vi (11) NIV� (12) H. (13) A la n3 (14) He (15) µ (16) 1.3'H (17) 0.5H (18) Al 4W$3 200 1554 68,3 040% 02] 9.6 1 0.97 1.87 T3 13.7 0,03 84 0.57 1.54 2.03 100 1.276 490.91 50165 Atx 509.75 1.25 1.87 125.0 0.0T 0169 7.3 0.03 OM 0.0 0.0 O.W 0 000 003 0.013 0.102 IMW WTOO 125 278 46A 0.16% 0.07 5A 0.01 1.85 4A 8.9 OA3 0 001 OA4 0.070 0.143 0.14 125 1.85 08.0 0.0]% 0.05 48 O01 093 40 3.] OM0 0.01 0.10 O.p18 0.110 0.11 125 OM090 002% 002 40 001 O00 CO 00 COO 0 O00 001 001 0.005 1 0020 1 0'U 'Ou11¢I WSE is Ii51CJ az tM grater M ¢i1M1¢r N¢ calCulal¢0 tallwdler Or Ilse Inven Out. Heigh t0 K CO. Rim OIR OR 10.74 003 OK 3.15 0.03 OVER -0.14 0.03 OVER -0.11 0.03 OVER -0.02 Regents School 1-G-347 Hydraulic Grade Line 0.012 SVUdure Whiter (1) Outlet Water Surface El..' (2) D. (3) Oo (4) to (5) Sm% (6) 14 (n Junceon rose FaralH (19) lnletwaler $una¢e Elea. (20) RIm. ESN (21) yo (3) He (9) Q (10) yi (11) Oi V� (12) H. (13) A la ig (14) He (15) µ (16) 1.3'H (17) 0.5H (18) At 41'a$3 2 h) 1554 gag 040% 0.2] 9.6 OBI 2,78 54 14.9 0.01 66 0.26 1.11 144 A72 0.995 490.63 50165 Ala 491.93 1.25 2.18 185.6 0.16% 0.29 54 0.25 2.18 5A 14.9 0.16 60 0.25 Aw A65 0.39 0.619 48254 IM1'OD Ala 49259 125 278 46A 0.16% 0.07 5A 0.01 1.85 4A SA OA3 0 001 OA4 OAS 0.090 0.164 492.95 49]00 Atc 493.61 1.25 1.85 88.0 OB]% 0.06 48 0.01 On CO 3.7 ON 0 0.01 all) Al2 0.062 0.124 Ai`179 497.47 Ald 494.]5 125 093 BBB 0.02% 0.02 4.0 001 000 00 00 000 0 AM00t 001 0.005 0620 49491 I9]00 'Ou0e1 WSFa1th. a M gRVI¢rOf either the Cakulate0 ta6wdter Or Me Invert Out. Height t0 K CM1¢nt RIM 0.59 OK 11.02 0.55 OK 14M O.IXi OK 4.0 0.03 OK 3.08 0,03 OK 223 Regents School 1-I}347 Hydraulic Grade Line 0.012 Structure Number (1) OWIet Water Sutlace Eli (2) D. (3) Oo (4) to (5) Sm% (6) Hr (n Jmchm. Law FImI H (19) Inlet Water $rAm¢ Eli (20) RIm. a. (21) yo (8) He (9) 0. (10) Vi (11) NIV� (12) H. (13) p la ] (14) He (15) (16) 1.3'H (17) O.SH (18) 81 413Od7 L25 1.54 tar 0.05% 0.01 5.9 On 1.% 12.0 18.5 0.07 57 1.21 1.50 1.91 (1 0.981 470.35 4M37 B2 485M 1.25 1$4 44.7 0.05% 002 12.0 0.07 1,03 7.2 ]4 0.28 0 002 0.35 OA5 0.= 0.248 485.110 49700 B3 490.15 125 103 fri 0.02% 0.02 Z2 002 (i 59 30 0.19 0 (1 (1 09 0.137 0.156 49031 49]4] B4 484.75 1.25 0.51 88.0 0.01% 0.00 59 (i 000 00 00 000 0 0.00 (1 (1 0.010 0.015 494.n 49700 '0u11e1 WSE is lirYed as the greater of either the calculaletl tali or the linen out. K Chei Height m Rim O.M OK 8.02 0.03 OK 7.16 OM OK 2.28 4;2 /; �. 0 m r � i- 4 i � \f Q , s A �ti-- � / r• ` STREAM DISPLACED WITH I-64 RAMP B CONSTRUCTION \ • CI 30 0 30 60 90 Graphic Scale: 1"=30' 147, 1 1\\ )\ - \ 5 -/' .�ii ieB i —��- _ I POA A AT MANMADE CHANNEL i — w SHIMP ENGINNG EERINGIf aH— .117— ;� ;Y\ " G ^w.. .K �► ' vS` ice' POINT OF ANALYSIS EXHIBIT ... ' REGENTS SCHOOL 4 - OF CHARLOTTESVILLE ,- } r ALBEMARLE COUNTY, VIRGINIA 1 lqut�r"7@t �k.. 'lll DATE: r/�- ♦ :S � 2020.07.27 \ 14� v FILE NO. 18.020 C1 OF III (� =(c,( � Nyloplast 6" Drop In Grate Inlet Capacity Chart - `� 3x% �� ` 3gJ Cf S yakd dVA'O'O vt 0.40 0.35 0.30 0.25 0.20 0.15 0.10 b.0 0.05 0.00 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 1.05 1.10 a Head(11) N 16 l [Su skeal G�� of VSMP �w DASD Y P 3130 Verona Avenue • Buford, GA 30518 (866)888-84791(770)932-2443•Fax: (770)932-2490 0 Nyloplast Inlet Capacity Charts June 2012 Nyloplast 12" Drop In Grate Inlet Capacity Chart '�4, S1Y1 n-v \ OAY,"Q K)wj L 0 Gk-PN PRf ix� 1.60 1.40 1.20 1.00 0.80 n a U 0.60 0.40 _ (0 Q= 0.20 Cf S 0.00 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 1.05 1.10 b.b1S Head(ft) N I® ylast* 3130 Verona Avenue •Buford, GA 30518 (866)888-84791(770)932-2443• Fax. (770)932.2490 0 Nyloplast Inlet Capacity Charts June 2012 [Ste S a G11 OF vNe f�y UA �] Stormwater Quality Calculations VRRM New Development Spreadsheet Pmled: Name: Negeota wool Dam: 2/21/2020 BMP Daan SPedi iwsL 2013 Draft Stds&Sped Site Information Post -Development Project (Treatment Volume and Loads) Lane Ca., laneal ASvils BSoils CSoilx DSoil[ Tsa3x PmnUDcenywl+aeil-waisanrom, etlfaraVvpm vrrNvresMlaM 1A3 nrtlxreil immvbee,gnambr mrimmmvueQ/ma 6.ffi 6EB m roux mre-laranl xAS xae Farrel/Open Sp vuaremmuraCeprerenNm vicevrEn - .meViyinly FunaJ)FeEunbnaMhnl I<.19 ronzmnm gainbu0rchnl a3 antall Ev iW MJEMCl whnmxID-L(-M a26 gen 0X1 EM[Imp/0 166 Watl naave/yr) BAI F rynl .n Nebl 0.90 Land C—er Summary TmaMent Volume and Nutrient Laads foreSVOpen Sp— Wer, (ac—) SA3 WeOg d0.r ibrertl 003 % u 3. Maragetl Twl filer 0—) 62H WeOtrd 0.r 1[mtl 020 %MawgM Turt CC% Im�rMouifiner lacrei 2AB 0.v11mperWou51 095 %Impetnoui ]M 3Re Arealxre5l 1A19 0.r 0.27 Treatmem Vnlume IauNl 031i6 TreMment V olwe labi[ hell 13,T11; 18 tvatl 116/yrl 861 tlli/yrl banal 6159 Inm�mamw Site Results (Water Quality Compliance) Area Checks FOREST/OPEN SPACE (a[) D.A.A 0.00 D.A.B DOD D.A.0 0.00 DA.D 0.00 OA.E D.ro RREACHECK OR. IMPERVIOUS COVER)a[) 0.00 OW 0.00 0.00 OW OK. SCOVERTREATED(ac) IMPERVWg MAEDTU FR AREA IaS) am O.W 0.00 ROD 0.00 O.m 0 GO O.W 0.00 0.00 OK. OK. MANAGED TURF AREA TREATED (a[) OW OW D.m OW O.W OK. AREA CNECKr13,703 OK. OK. OIC OK. Site Treatmt Volume (ft.) R�Dramage Runoff Reduction Volume and TP Area D.A. A O.A. B O.A. C D.A. D O.A. E TOTAL RUNOFF REDUCTDAVARIOLE 0 0 0 0 0 FOR RE OVAL (Ib/1) TP LOADAVAINRLE FOR REMOVAL Qb/yi) O.m 0.W O.m O.m O.W O.m W WADREDUCFIONAOCEVED IIb/yrl O.m O.W O.m O.m O.W 0.00 TP LOAD REMAINING (Ib/yr) O.m 0.00 O.m OWO.W O.m NMROGEN LOAD REDUCTION ACHIEVED(Ib/yrl OW 0.00 O.m O.m O.W O.m Total Phosphorus FINAL POST -DEVELOPMENT W LOAD Qb/yQ FF 8.61 W LOAD REDUCTION REQUIRED (Ib/yr)jj 2.79 W LOAD REDUCTION ACHIEVED (lb/yFl OW W LOAD REMAINING (Ib/N):F 8.61 REMAINING TP LOAD REDUCTION REQUIRED (lb/yr):l 2.79 Total Nitrogen (For Information Purposes( POST -DEVELOPMENT LOAD (Ib/yr) 61.59 NTIAOGEN LOAD REDUCTION ACHIEVED (Ib/yrl OW REMAINING POST -DEVELOPMENT NITROGEN LOAD 11161 l 61.59 Virginia Runoff Reduction Method VVarkeheet Site Summary Project Title: Regents School Date: 44040 Total Rainfall= 431nches Site Land Cover Summary A soils BSoils CSoils DSoils Totals %of Total Forest/Open (acres) 0.00 5.43 0.00 0.00 5.43 38 Managed Turf (acres) 1 0.00 6.28 0.00 0.00 6.28 44 Impervious Cover (acres) 1 0.00 2.48 0.00 0.00 2.48 17 14.19 100 Site Tv and Land Cover Nutrient Loads Site Rv 0.27 Treatment Volume fts) 13,703 TP Load (lb/yr) 8.61 TN Load (lb/yr) 61.59 Total TP Load Reduction Required (lb/yr) 2.79 Site Compliance Summary Total Runoff Volume Reduction (ft) 0 Total TP Load Reduction Achieved (lb/yr) 0.00 Total TN Load Reduction Achieved (lb/yr) 0.00 Remaining Post Development TP Load 8.61 (lb/yr) Remaining TP Load Reduction (lb/yr) 2.79 Required ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Drainage Area Summary D.A. A DA. B D.A. C D.A. D DA. E Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.00 0.00 Managed Turf (acres) 0.00 0.00 0.00 0.00 0.00 0.00 Impervious Cover (acres) 0.00 0.00 0.00 0.00 0.00 0.00 Total Area (acres) 0.00 0.00 0.00 0.00 0.00 0.00 Drainage Area Compliance Summary DA. A D.A. B D.A. C DA. D D.A. E Total TP Load Reduced (lb/yr) 1 0.00 0.00 1 0.00 1 0.00 0.00 0.00 TN Load Reduced (lb/yr) 1 0.00 0.00 1 0.00 1 0.00 0.00 0.00 Summary Print Virginia Runoff Re udioa Methotl Malumeet Summary Print Independent Reports Excerpt from NRCS Soils Report NOAA Precipitation Report Custom Soil Resource Report Soil Map II II• 1- .I b° 112" N nslm nsmo n� nsmo nmoo nmm n 3 Map Sale: 1:5,88Q'IF panted m A farms. pe (11" x 8.S) w N b 0 :D 700 ZI70 300 O r A o za :m ,000 ,,m Map prolemon: Web Macau Carver mordinntes: WGS&, Edge tics: UlM Zone 17N W(S84 9 moo ne,m 71M) 7163DO n(M 71 a 1' 39 N K 8 38° 1'lr'N 71 o 3 MAPLEGEND Area of Interest (AOI) O Area of Interest (AOI) Solis O Soil Map Unit Polygons ,•.,I Soil Map Unit Lines Soil Map Unit Points Special Point Features V Blowout ® Borrow Pit Clay Spot Q Closed Depression Gravel Pit Gravelly Spot O Landfill A Lava Flow Marsh or swamp Mine or Quarry O Miscellaneous Water O Perennial Water y Rock Outcrop + Saline Spot Sandy Spot Severely Eroded Spot 0 Sinkhole Slide or Slip $odic Spot Custom Soil Resource Report Spoil Area ® Stony Spot W Very Stony Spot Wet Spot 0 Other •� Special Line Features Water Features Streams and Canals Transportation 4_14 Rails A/ Interstate Highways •� US Routes Major Roads Local Roads Background . Aerial Photography MAP INFORMATION The soil surveys that comprise your AOI were mapped at 1:15,800. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Albemarle County, Virginia Survey Area Data: Version 13, Sep 17, 2019 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: May 20, 2019—Aug 1, 2019 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. 10 Custom Soil Resource Report Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 14C Chester loam, 7 to 15 percent 3.0 4.3% slopes 14D Chester loam, 15 to 25 percent 1.7 2.5% slopes 14E Chester loam, 25 to 45 percent 7.9 11.4% slopes 19B Minnieville loam, 2 to 7 percent 9.8 14.1% slopes 19C Minnieville loam, 7 to 15 6.5 9.3% percent slopes 19D Minnieville loam, 15 to 25 22.1 31.8% percent slopes 36B Hayesville loam, 2 to 7 percent 2.0 2.8% slopes 36C Hayesvlle loam, 7 to 15 percent 7.5 10.7% slopes 56B Meadowville loam, 2 to 7 0.3 0.4% percent slopes 77 Dan River-Codorus complex, 0 8.8 12.6% to 2 percent slopes, occasionally flooded Totals for Area of Interest 69.4 100.0% Map Unit Descriptions The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. Most minor soils have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a 11 Custom Soil Resource Report Albemarle County, Virginia 14C—Chester loam, 7 to 15 percent slopes Map Unit Setting National map unit symbol: kb81 Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Farmland of statewide importance Map Unit Composition Chester and similar soils: 80 percent Estimates are based on observations, descriptions, and transacts of the mapunit. Description of Chester Setting Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from granite and gneiss Typical profile H1 - 0 to 7 inches: loam H2 - 7 to 41 inches: clay loam H3 - 41 to 79 inches: loam Properties and qualities Slope: 7 to 15 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: Moderate (about 6.9 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 3e Hydrologic Soil Group: B Hydric soil rating: No 14 Custom Soil Resource Report 14D—Chester loam, 15 to 25 percent slopes Map Unit Setting National map unit symbol: kb82 Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Farmland of statewide importance Map Unit Composition Chester and similarsoils: 80 percent Estimates are based on observations, Description of Chester descriptions, and transects of the mapunit. Setting Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from granite and gneiss Typical profile H1 - 0 to 7 inches: loam H2 - 7 to 41 inches: clay loam H3 - 41 to 79 inches: loam Properties and qualities Slope: 15 to 25 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: Moderate (about 6.9 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4e Hydrologic Soil Group: B Hydric soil rating: No 15 Custom Soil Resource Report 14E—Chester loam, 25 to 45 percent slopes Map Unit Setting National map unit symbol: kb83 Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Chester and similarsoils: 75 percent Estimates are based on observations, Description of Chester descriptions, and transects of the mapunit. Setting Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from granite and gneiss Typical profile H1 - 0 to 7 inches: loam H2 - 7 to 41 inches: clay loam H3 - 41 to 79 inches: loam Properties and qualities Slope: 25 to 45 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: Moderate (about 6.9 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: B Hydric soil rating: No Custom Soil Resource Report 1913—Minnieville loam, 2 to 7 percent slopes Map Unit Setting National map unit symbol: 2v7hq Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: All areas are prime farmland Map Unit Composition Minnieville and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Minnieville Setting Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from acid and basic igneous rock Typical profile Ap - 0 to 8 inches: loam Bt - 8 to 60 inches: clay C - 60 to 67 inches: clay Cr- 67 to 79 inches: bedrock Properties and qualities Slope: 2 to 7 percent Depth to restrictive feature: 60 to 120 inches to paralithic bedrock Natural drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Very low to moderately high (0.00 to 0.20 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: Moderate (about 7.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 2e Hydrologic Soil Group: B Hydric soil rating: No IVA Custom Soil Resource Report 19C—Minnieville loam, 7 to 15 percent slopes Map Unit Setting National map unit symbol: 2v7hr Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Farmland of statewide importance Map Unit Composition Minnieville and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Minnieville Setting Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from acid and basic igneous rock Typical profile Ap - 0 to 8 inches: loam Bt - 8 to 60 inches: clay C - 60 to 67 inches: clay Cr- 67 to 79 inches: bedrock Properties and qualities Slope: 7 to 15 percent Depth to restrictive feature: 60 to 120 inches to paralithic bedrock Natural drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Very low to moderately high (0.00 to 0.20 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: Moderate (about 7.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 3e Hydrologic Soil Group: B Hydric soil rating: No itV Custom Soil Resource Report 19D—Minnieville loam, 15 to 25 percent slopes Map Unit Setting National map unit symbol: 2v7hs Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Farmland of statewide importance Map Unit Composition Minnieville and similar soils: 80 percent Estimates are based on observations, descriptions, and transacts of the mapunit. Description of Minnieville Setting Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from acid and basic igneous rock Typical profile Ap - 0 to 8 inches: loam Bt - 8 to 60 inches: clay C - 60 to 67 inches: clay Cr- 67 to 79 inches: bedrock Properties and qualities Slope: 15 to 25 percent Depth to restrictive feature: 60 to 120 inches to paralithic bedrock Natural drainage class: Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat): Very low to moderately high (0.00 to 0.20 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: Moderate (about 7.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4e Hydrologic Soil Group: B Hydric soil rating: No Custom Soil Resource Report 36B—Hayesville loam, 2 to 7 percent slopes Map Unit Setting National map unit symbol: 2xxy2 Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: All areas are prime farmland Map Unit Composition Hayesville and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Hayesville Setting Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from granite and gneiss Typical profile A - 0 to 7 inches: loam Bt - 7 to 58 inches: clay BC - 58 to 67 inches: sandy clay loam C - 67 to 63 inches: fine sandy loam Properties and qualities Slope: 2 to 7 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: High (about 10.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 2e Hydrologic Soil Group: B Hydric soil rating: No 20 Custom Soil Resource Report 36C—Hayesville loam, 7 to 15 percent slopes Map Unit Setting National map unit symbol: 2xxy4 Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Farmland of statewide importance Map Unit Composition Hayesville and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Hayesville Setting Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from granite and gneiss Typical profile A - 0 to 7 inches: loam Bt - 7 to 58 inches: clay BC - 58 to 67 inches: sandy clay loam C - 67 to 63 inches: fine sandy loam Properties and qualities Slope: 7 to 15 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: High (about 10.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4e Hydrologic Soil Group: B Hydric soil rating: No 21 Custom Soil Resource Report 56B—Meadowville loam, 2 to 7 percent slopes Map Unit Setting National map unit symbol: 2xxyc Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: All areas are prime farmland Map Unit Composition Meadowville and similar soils: 85 percent Minor components: 5 percent Estimates are based on observations, descriptions, and transacts of the mapunit. Description of Meadowville Setting Landform: Interfluves Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Colluvium derived from igneous rock Typical profile A - 0 to 14 inches: loam Bt - 14 to 46 inches: loam 2C - 46 to 79 inches: loam Properties and qualities Slope: 2 to 7 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Well drained Runoff class: Low Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 5.95 in/hr) Depth to water table: About 36 to 60 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: High (about 10.0 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 2e Hydrologic Soil Group: A Hydric soil rating: No Minor Components Delila Percent of map unit: 5 percent PA Custom Soil Resource Report Landform: Drainageways Landform position (two-dimensional): Footslope Landform position (three-dimensional): Head slope, tread Down -slope shape: Concave Across -slope shape: Convex Hydric soil rating: Yes 77—Dan River-Codorus complex, 0 to 2 percent slopes, occasionally flooded Map Unit Setting National map unit symbol: 2v7k0 Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Prime farmland if drained and either protected from flooding or not frequently flooded during the growing season Map Unit Composition Dan river, occasionally flooded, and similar soils: 50 percent Codorus, occasionally flooded, and similar soils: 40 percent Minor components: 5 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Dan River, Occasionally Flooded Setting Landform: Flood plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Alluvium derived from igneous rock Typical profile A - 0 to 12 inches: loam Bw - 12 to 35 inches: silt loam C - 35 to 79 inches: silt loam Properties and qualities Slope: 0 to 2 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Well drained Runoff class: Low Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: About 36 to 60 inches Frequency of flooding: Occasional Frequency of ponding: None Available water storage in profile: High (about 9.0 inches) 23 Custom Soil Resource Report Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 2w Hydrologic Soil Group: B Hydric soil rating: No Description of Codorus, Occasionally Flooded Setting Landform: Flood plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Alluvium derived from igneous rock Typical profile A - 0 to 8 inches: silt loam BA - 8 to 16 inches: silt loam Bwl - 16 to 26 inches: silty clay loam Bw2 - 26 to 40 inches: silty clay loam Bw3 - 40 to 79 inches: silt loam Properties and qualities Slope: 0 to 2 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Somewhat poorly drained Runoff class: Very high Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: About 8 to 18 inches Frequency of flooding: Occasional Frequency of ponding: None Available water storage in profile: High (about 11.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 3w Hydrologic Soil Group: B/D Hydric soil rating: No Minor Components Hatboro, occasionally flooded Percent of map unit: 5 percent Landform: Flood plains Down -slope shape: Linear Across -slope shape: Linear Hydric soil rating: Yes 24 NOAA Atlas 14, Volume 2, Version 3 ANLocation name: Charlottesville, Virginia, USA* Latitude: 38, Longitude:-78.5368° Elevation: 491.46 ft** € N* 'source: ESRiMaps "source::USGS POINT PRECIPITATION FREQUENCY ESTIMATES G.M. Bonnin, D. Martin, B. Lin, T. Parzybok, M.Yekta. and D. Riley NOAA, National Weather Service, Silver Spring, Maryland PF tabular I PF graphical I Maps & aerials PF tabular PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches) Average recurrence interval (years) Duration 7 2 5 10 25 50 1 100 00 200 500 1000 Smin (0.3117---0 391) (0.3778-0465) (0.443-0.544) (0.496-0611) (0.556-0686) (0.602-0..745) (0.642-0.800) (0.680-0852) (0: 22-0 917) (0: 550 972) 0.562 0 8 11.115 335) 70.min (0.508062a) (0.605-0.744) (0: 09-0872) (0.7930978) (0.885t09) (0.958-1.19) (1.021.27) (1.08 1 (1:4ta5) : (19-1.3) 1. 1. 75-min (0.632-0..780) (0.760-0935) (0. 977-1.10) (1.00- .24) (1. 2--1.39) (1.21-31650) (1.29-11..61) (1.36--11..71) (1."-1.83) 1 (149-1.92) 0.962 1.16 1.42 1.62 1.86 2.06 2:23 2A1 2.63 2.80 30.min (0.867-1.07) 1 (1.05-1.29) 1 (1.27-1.57) 1 (1.451.79) 1 (1.66-2.05) (1.83-2.26) (1.98-2.46) (2.12-2.65) (2.29-2.91) (2A2-3.11) 60-min 2873) (1.08-1.33) (1.32-1662) (1.63 2.01) (18 9-2.33) (2.22 (24 83.07) (2.72 3839) (2.9733.72) (3. 8-4.17) (363-4.54) 2.57 6.43 2-hr (1.26- 65) (1.53- .9 (1.92 2949) (22 52.92) (2.673a.47) (3.01 3793) (3.353.89 5-4.40) (3: 0-4.89) (4.15558) (4. 6 17) 3-hr (1.38�82) (1.67 220) (2.09-2.75) (2.443.22) (29 0-3.9) (3.274�33) (36 5-4.86) (4635.41) (4. 3-6.18) (49 56.83) 6-hr (1: 9- 29) (2. 5�76 (2.67 3343) (3: 3-4.03) (3: 4-4.84) (42 5-5.3) (a: 86.27) (53 3707) (6.09 822) (6.749.23) 2. 3.83 6.62 12-hf (22 5P�.92) (2.731 3751) (3.37-4..38) (3.975317) (48 0-6.27) (5 503.25) (62 38.32) (7.02 9748) (8.14--11.2) (9.12- 2.8) 24-hr (2.74341) (3.32-4913) (42 35.27) (4.99821) (668- .60) (760-5.80) (8.00- 0.1) (9.06-11.6) (10.6-13.8) (11.9-15.6) 2-dey (32 34.01) (3.91-4587) (4.968.18) (5.82---728) (7.03-8.81) (8.0210.1) (9.08-11.5) (102- 3.1) (11.8-15.4) (132-167.3) 5.89 3-day z64) (3.48-4.23) (4.21---5.13) (5.34-6.51) (62 6- (7.5 9.28) (8.64- 0.6) (9.77- 2.1) (11.0-13.8) (127 6.2) (14.16- 8.2) 4-day (3: 34.45) (4.51 5239) (5. 2-6.85) (6: 0-8.02) (8.161 974) (9.25-1212) (10.5 2.7) I (118-14A) (13.8 6.9) (1571- 9.1) 7-day (4.345.13) (52 M.1 (6.52 7D72) (7.3-8.98) (9.06--110.8) (10.3-2.3) (11.5-13.9) (129-15.7) (1476 8.2) (1673 0.4) 10 day (4.94-5477) (5.94893) (7-32 8?55) (8439.86) (9.97--111.7) (11 2?13.2) (12.514.8) (13'8 6.6) (157- 9.0) (17.1--21.1) 20 day (6.3- .50) (7.85-8.95) (9A7-10.8) (107- 2.3) (12.414.2) (13'�15.8) (15.1-1 4) (16.4-9.1) (182-21A) (19.5 3.2) 30-day (8.12 9.15) (9.62-10.8) (11.4-12.8) (127 14.3) (14.416.3) (1576--17.8) (16.9-19.3) (18.1- 0.7) (19.7 22.7) (20.824.2) 45-day (102- 1.4) 1 (12.0. 3.4) 1 (14.0- 5.7) 1 (15.57.4) 1 (17.4 9.6) 1 (1821.2) 1 (2021' 2.7) (21424.3) (23048.3) (24227.8) 60 day &� (12.0. 3.3) (141-15.6 (167 18.0) (178 9.8) (19.922.1) (21 3.8) (22274-25.5) (2421527.0) (25� 9.0) (26.8 0.5) 1 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS). Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a iven duration and average recurrence interval) vnll be greater than the upper bound (or less than the lovrer bound) is 5%. Estimates at upper bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values. Please refer to NOAA Atlas 14 document for more information. Back to Top PF graphical