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HomeMy WebLinkAboutWPO201600072 Plan - E&S Minor Amendment 2020-05-11o" WP0201600072 Amendment 3 AMENDMENT TO EROSION CONTROL PLAN FOR FP 1'mt" 1WOU'LEN MILLS LtUOHT tNDUSTRIAL PARK TAP `t_ yi131� -' / . '�j' ���� ` w b� jsf,* 9 TAX MAP 2 PARCEL 4 0 CA . Ark �, "fin TjjPCO 'F�efer to Sheet ��,"" '� � $ 93_65P1�T6 El OTT VILE DISTRICT, ALBS T E COUNTY VI INIA C — 5 01 �v�� y®SL�O?i�� 110 , Purpose of This Amendment ow 1. This amendment shows the installation of a sediment basinnd removal of a 71-4°� g, sediment traps ST-1, ST-2, and ST-3. ® OM TO.5 1&3r, a �` 2. The total area of disturbance is 5.78 acres. li5 �p ' i PP - SITE DATA j, SITE PLAN NUMBERS: SDP201600076, SDP 20/800065 T�>? �;gATo�z WPO PLAN NUMBER: WP0201600072 FSV A�F' A"6 IF1 AT ' s $ s rs'LI = LEGAL REFERENCE: TM 77, PARCEL 4.0B !� g r: vAC �: ' APPROVED ��-� This area to remain undisturbed until site plan amendment for phase 2 has SOURCE OF TITLE: DB 5256 P AGE 213 by the Albea eel k" County r T� ��$I� been approved. Phase 2 grading and drainage system shall direct water to FJ, � C • n�5 Sediment Basin. Subsequently, this area has been included Tn the Sedimeni ----_ ---__ --_ ` �;(}j`Rff4LR*j 0evg1opT lent [lepYaftme,ll� aCa Basin drainage area In order to be sized for the phase 2 improvements. 6q7 D1 - OWNER,/APPLICANT: ELEMENTAL_ ECOTECH INC. = �I.I ` 809 BOL'LING NIT C �" Z O O 14. Q7 s �� - CHARLOTTESVILLE AVE,, VA 22902 y rf ' ,�q. TIFF Ar1l ��2oiavgG MAGISTERIAL DISTRICT: SCOTTSVILLE ZONING: LI — LIGHT INDUSTRIAL, FLOOD HAZARD, STEEP SLOPES (MANAGED AND PRESERVED e191 : mil 3813 a: PARCEL AREA: 14.06 ACRES :•4., '~~ d� s,A$76 6217 ,T PARCEL ADDRESS: NOT ASSIGNED 650 SOURCE OF BOUNDARY: PLAT RECORDED IN DB 4893, PG 401 ,® SOURCE OF TOPOGRAPHY: TOPOGRAPHIC SURVEY PERFORMED BY DRAPER ADEN, DATED FEBRUARY 20, 2015 ' '® OFFISTE TOPOGRAPHY FROM ALBEMARLE COUNTY GIS DATA. TOPOGRAPHY WAS VISUALLY VERIFIED BY TIMOTHY MILLER ON MARCH 20, 2018. 91 / APPROXIMATE LOCATION EXISTING TES t ,l VARIABLE WIDTH ACCESS EASEMENT ;'" ® ` ®7 �C, 1 - ,� �n P ,. FLOODPLAIN: PORTION OF PARCEL IS IN ZONE X AS SHOWN ON FEMA MAP NO. 51003CO289D, C T � s � d 1 , ` a /� -'�� % ��D �� ..�,'' EFFECTIVE DATE FEBRUARY 4 2005 AND MAP REVISION DATED FEBRUARY 6 2017. �TVS TO ' - 100 YEAR FLOOD ELEVATION IS 324.00. 1,T 9g8 0 e sc ------------- -�'-4� R---------- - - - - - "',` - - - - g---- --= ..-- - -'�� `� •�`� SWM VOLUME CONTROL: AREA OF DEVELOPMENT IS LESS THAN 1 % OF TOTAL DRAINAGE AREA. fi `. _ ----- �� .. O' FH } - _ r� t \ - - - ---- �. �+ �.� �► CONSERVED OPEN SPACE AND PURCHASE OF NUTRIENT CREDITS -asp$ SWM WATER QUALITY: E {p ATO) 7 ---- `" l ! -- ------------------------, -''�' T,1` r. PUBLIC WATER SUPPLY: THIS PARCEL IS NOT LOCATED WITHIN A PUBLIC WATER SUPPLY RESERVOIR WATERSHED. 1 ISTING VARIABLE VADTH PRIVATE ---�11 /.- _ __ �� 1 �r ? ��� � - 4 y 7 j v GHT DISTANCE EASEMENT r _ EXIS ��'O' "'(ram` ✓� 'L~� l B 4935 PG 9O 7�dC i ' �_/ PRIV �, " EXISTING 30` ,�-p�( g •� �� T' 7 C L 3 ; STO SEWS SANITARY SEWER , EAS V EASEMENT e 0i !r(f i i! i�•s' %ol ST % / D3 35 PG 90 7 °' - y, DB 342-197 '•' �®,OBE � ' �•"� r if � 'g'1�i4° � � � � I __ EXISTING 30 i' �./ EXISTING 20PRIVA6 SANITARY SEWER J , ,'� / MAINTENANCE ACCE ? I EASEMENT / EASEME II ---- DB 342-197mn ✓a ,_08- 49355 PG �` EXISTING A AIR BL 1 I - 5ros 5d" WIDTH STORM r r - -- - - EHo FACILITY , t�EASENIENT �i w oo 35 Q dd64 ,- � 1 P 9Y r� 1t914aO, y 4� { J ! V 6 f• S9 ,../� - J11%d -.' E �V` E+./S V '✓ ���'-///...[[[ill /'.� {/•-^+ -� ° � �-� � �,� ��� -� �..� _'r.. ���vARI l F WIDTH `° ��. �ti"� � ��,�. � •. AND OPEN',1 j 1✓i' J� / } �(7 �: ✓ o /\'/L/ i�i it �) ✓q SPACE EASEMENTS1/' �`�% ✓� 5f d.., ?•s ' Y 9 . �. e. k ..a/j 1✓ -` 1 ••'p�...., .1 I er to I ri Set �, DB 4s35 PG sn L -� - ;+ �� �.• ,�- '�`' � ~'� ` �`y' ,� � � h �'' � �'�' ,�`%-� .�� ,$`"�~. .,, -�t;� '`. •���' � .r � �.��'� � � � mot..; si '� APPROXIMATE I BLE WIDTH `�7 `� ✓ , , it l VARIA�. LOCATION OF 1 ✓1 `7t�t✓-' }�, FOREST AND OPEN B 3O' SAN SEWER ESMT v" ! �1. `y_S �j'l00.�DBA4935APGMIE TSB $ q� " DB 1091 PG 343 ✓� r 90 0)-j XISTl E E ,EN ! k p ~�--,0^� _'�/ �" 5 t'_j5+.�7✓�/ ��'r5+ V'" )tom—n�f�' y�—` " .`1 `J ' 1�• lj• '' r ) 7 ��1}/_�(� �� }� V_ s O'� ✓��V1`� V L.. ( ✓� 1 5 �1� VV J p r� V 2 �,�1(,/j/ /r9, ,1 -��._ _�'I r-��[�'-�'�•-�a- - 4�-= . rt GL� �� .� 1.37...`��,L_ _� „', t��-�,, � j ��<•l�!.✓[- � ' SLii`"'� V"'��j�•/�,`-`V_'t' �`Jy\ � � f"}�^(+r �� .� � s ; EXISTING 2O• DRAINAGE EASEMENT ` '�`�• � f` �o O ��R DB 3594-664 76 ! V R 0 Tflo t r 60 ;' vs 60' 0 60' 120' 180 t 1 PARCEL OVERVIEW —50 SCALD. 1" — 60' SCALE. 1 "=60' r wf\� 2 VICINITY MAP c-aa SCALE: 1 "= 2000' -r,nrk5 SKEET I E C-500......... COVERSHEET C-501 ........ EROSION PLAN - PHASE I C-510........ DETAILS C-511 ........ PROFILES & HYDROLOGIC CALCULATIONS LEGEN- D PP POWER POLE SCC STORMWATER CONVEYANCE CHANNEL BUILDING SETBACK - 3 PARKING SETBACK 1 PRESERVED SLOPES PER GIS MANAGED SLOPES PER GIS LLA N 3 tJ A ill tZa r^' xK• L r I 094 E- W SHEET 1 of 4 \�AP� 1 PF vi \ ,\ Jl _ - ;, �---PHASE 1B SEQUENCE OF CONSTRUCTION 32� -- H LIN ,A D \ - % s o �� - �4-" �'z / °-. 1 Install Sediment Basin. ' J \\ 2. Remove Sediment Trap ST-1 �c ST-3.--�3���. J� -� _ 3. Construct Improvements for entire site. �� - � _ 3�� � l/; -_ � Q- p � 4. Sediment Basin shall remain in operation until site is stabilized and County Inspector grants permission for removal. �o ��� AZARp° i OVERLAY 5. Backfill sediment basin and install remainder of 24-'y HDPE between � � y, � DISTRI, `\\ q� STR-1 TO STR-2. ' % a disturbed b grading for the sediment ;,_ /�� `,vvv,i�l ; � /; , ,,% ,; ,,/i,; �; ;,,;- y � �. Are y g g ent bash must have loll amendment and tree plantings. See C-510 for SOIL AMENDMENT NOTES. Ptl t4 I �°- ~_ - % - �' � C�+� stti-r .s•.✓-/''�i� i, / ! / ,, /ti/ j ' \. �1 \ I/ i ' '^_~ i � (� y I v � � � � r�i E'+ S��7N CANOPY AREA Z �' PQ � � �7t , y:` -'`� PP ��� �Y y ' j / � ' ; ' / \ dv� I 1 ICi A�(- A T PRESERVED p� al 1. i / / / / / }(�9 \ V / I v b_ / A �i0, 1 SQ. FT. X 40 Ci _ - 1 i M WATER h�ry y i , '; %' / � i / �/'�j 3 3 S � � // sTo�,� �7 �7 ¶'ij.f��j/`��7 \ _- _ _ / '' / /- / / Y-` / ,`1 \ •�ytq 6 4P �,!•�' `4.! `\ ".^.-....` _...' -` •�•r /�1�L•1,/� V rt l •LLEdd'�A.�.4Jb"d \''4^- •` ,s. fit '••'A } \, /' / / ,%f i i/ ' •`~ _ \ 1 j)k/ �,j f�`� i \ 't-,,.�•^---- v S' Lr'�J '�d C�Y1�7 \ : - ;�.� "� !Fi . U pD r 4Gi yr FEMA loadplafn _ C2 evel Spreads EIeY - 312.0 C) j EX i l ( l l \ \ \ \ \ \ ` � y 1, \ 0� �� y 0 C co r i +1, \' t i \ \ \ \\ \\\ �\ \\ \\ \\ \, \ \\ \ \ \.\ \ \ �1 \ ' y i I ^l� y y v/� y y y ~� Z ` 4 i; � U t '���� '�.,,� %' \ , �jA ��- \ � \• A V \ V 1 \ \\ \ \ A V \ \ A, � '• - A y''_ A. 'y y y x r �' e m a y � rQ '� �'J � �7 E-i � pj � � ��t \ g1 \ , � \ \ '�, \ \ \ � \ \ \ • \ \ \ \\ \ \ \ � \ � \ \ � � * � - II �l.Q ` \ "-� - 40=• i NOTES: IN 1. Excavate Stormwater Flow Equalization Basin to function SCALE: 1" - 30' as an energy dissipater during construction. Contractor to re -excavate to design volume followin site stabilization. \ C t lJ \ O \ I TM N - - - , \ t \ \ \ \ \ \ \ ---- - f --- p — V� i 1)13 5 / i -- - -- -- �- ' This area to remain undisturbed pan amendment for phase 2 has been approved. Phase 2 grading and drainage system shall direct outer to \` \ \ \ \ \ \ \ \ \ j,ZZ � - _ - Sediment Basin. Subsequently, this area has been included in the pediment - ' \ \ \ \ \ r/ VG- �g6 ' ��G� _ \ _ \ - _ Basin drainage area in order to be sized for the phase 2 improvements. - " - / 1)13 q1 _ ' / i i �- i \ _ . ` - _ - - — - — l — ' ,�, 'i- �i /.• or' r- ,Slope --greater-than 3:9 / - - - - - - - - 1� See Landscape Note $ \ _- ~ _ -- — - — — — — P - ---- --------- _ - \_ - 9 v3 t V \ _ A _•_ "'r �New Retaining Wall 11 - - - _ � p 3 �'�c i / 3 J Stub�aut for ` MaxHeighttziln a } J 'Portion of i' j 15 kL Hon to D" Phase 2 Building ./ / / ti future nee w - - - 1�' _ t(, i Foundation t+ 24' HDPE Skub-out IP /� - rovide cut-o / Z 1 v for future connection / / % �P y - % /� to Phase 2 /` % ;' sleeve thru wall �� / \ / / /i i / � r.> U! i��'_ 10, � / - SFr' Area G , i {� - j/ /%i ' '. ' Q) CD / '� +\ �` \ �• '\ - �ST#Y _ �Sp/+Jp� 135 SF - \�/ '/./ i�\✓i C3 ��', %� ��� tV` o V A V A �• - -� - i` % / % , New- etaining Wall E 0 IJFE-MO Safet Rail 0 0 A A �� %' a. 1 �' elgh =13 - -' - _ � � Max H t /' •i }� /t\\ V \ �. -. i-� P I tin nn.� - �•o -a 'i -i'.- 4s I Plan g �'reO 136 SF / ! i �a_ - ti ✓ d7 �1i, / C] �Yy` +\V -� •� �� \ A "%,_ A- — — / ' i' t J 1` i t i � � a�� '.i-•�• .-, y� - - [.t-' rr (yV�1'S�Ag 36 \ / }}\ Plonting,A$r SF 6 6�' �~ !/ i `^^ - - - J f I / t sL _ _ '�\\ \� ��\' I rCa r7� y„� �' - , i DDT :,.5fi� ` ,�, •�� -' �/ / /% I�. / 3-^34YSF �r ' �� _- �� - -�,<<rI . ! `\ / L- C% i �, ' 4 / f ' �1,` } t.i \ � `' — \ \ ''i''" - f ® � ' .x -"°`. a �•. s9• � 3 - -+ � -{� -----3.� _ _ _ -` � i • i///,i� -- Iy � t Z t/ •� +�j el ( { 1 i /•, / + t \• New Retaining'Wall A' \�. - - - - I `�F �+'` kk I` - - ~'' / // / / /i / f®I Max Hetghk=2' \ ® / i i �r Pq New Retaining walt-c -� //'/ /- ( \ i �i Cn �i � �` - - � .• ` i � � Y w(V DDT GR 2 mounted Slopcl greater than 3: T - ` - / ' % % = -to to of-walt See Landscape\ Note 8 �' _ _r 3`� - p I STORY _ Max Height=95' j f `�, t _ StD ing \ \ - _ _ , ~a W o -- - •' ; 7,8QD SFt1Fi - ,-, l - -- ,' i. i' i /1 \/ ( \ I / ' •��;; ; \t t� 1t A 4 �! �,,\ \ _ - 17r�" *w Retaini g-Wall \ -318.5 �r // I�to Z ` IJ - „ yw/safety�roij" { } I I J•�" t t t - ia' -i �,/ _ - _ / / / / � Imo' Est T .A / wt } ,t %�, \ - - y1 r _Aax-Height=3.5 / ` C.O. _ - - % I C 1 1 I La / pp N 'Slope greater than 3: t i ~ y _ _ - - - �� -_ _ / 1 ' I All 5`� ` l� ti 4 ttp \�v See-Lon�sca'pe Note 8 -�. / \ - ' -G `1D�g _ - _ - ! I= I � T J. ®{�{ C+ � �� l \ .}� y _`\ _ +° h \; �'" i _-ohp — — — — \ �-i \ � L}- 1•'9 ..•/� `y -- ` � / i r✓ /�-------------- -- � \ ` � I�� 130 c_+'" r O-1�' ..tlh } ' _ � .. - '``,. •' _ tY \- ,,�- ~ p' - Y y - - _ \ . -`` --' ' - _ - - - - - - - - - - - - - -. _ _ _ - a -- - _ - - - - \ ' \ V .S l 1 4 I I YIj� tjJ OL IV + ' _ �y 'a�.. ~EXISTING GC"NP'LAREA=A"- �, E , 1 I I t �\ `'�,� a• - M BE PRESERVED _ �g� < � +.� 100 yr FEhiA Floodplain -\ _ E � l _ C� t®I t \\--19Q�f „V e(�' ►� F, �1 , lil` Exist.y --- _-- -- --- - �. - - - - - - - - - - - - - - - - - - - ® , 1 r Street WEI r y ' m ! w / one - -�^ - - - _ _ \ / 0 Sltet� Y®wt - - ~ - - -- - -- - - `� st y-- o `_- r"!��-- ' ' - r `'- - - - ` �i eta r : _ f_� _ _ o - ------------- - f� a 4 l Sign - -= �!�€7- u�t�-�^ \ /` '� SHEET NO. l - 1 I f 1 1 p� Rima322.ea a �t3W5 i Inv. InSyfCp%- I I' ' , ` •i--- �aY lG..-�nYC-501 /30'� I I l 30 / 6( 90- � .,' - \ �x - 4�R CD �00pES G',R Em �' ' - -`-- J `� - z_r r \ - _ I ' I o, ----- - - _ - _- T N- sc . - S�f 4 ��� SILT E SOIL AMENDMENT NOTES EROSION & SEDIMENT CONTROL NOTES 041 A STD. & SPEC, 5.05 - VA. EROSION AND SEDIMENT CONTROL HANDBOOK (1992) 1. SOIL COMPOST AMENDMENT SHALL BE IN ACCORDANCE WITH VA DEQ DESIGN SPECIFICATION NO. 4. ES-1: Unless otherwise indicated, all vegetative and structural erosion and sediment control practices will be constructed and maintained ��� �'}r111 AL 2. AREA DISTURBED BY SEDIMENT BASIN (SA) = 9,000 SF, according to the minimum standards and specifications of the Virginia Erosions and Sediment Control Handbook and Virginia regulations ' aZ NO WIRE BACKING WITH WIRE_ BACKING CONTRIBUTING IMPERVIOUS COVER (IC) = 2,800 SF VR 625-02-00 SEDIMENT BASIN IS LOCATED IN SOIL GROUP B, ; p Q / IC/SA = 0.30. ES-2: The plan approving authority must be notified one week prior to the pre -construction conference, one week prior to the � i _ 6' MAX �--10' MAX TABLE 4.3 REQUIRES 3-INCH DEPTH OF COMPOST. commencement of land disturbing activity, and one week prior to final inspection. V, f I c`'' af Existing 1-6- 21A Aggregate Base Filter Cloth 16' - 3 16" - 3 MESH a COMPOST VOLUME = 9,000*3*.0031 = 83.7 CY p pIx 3. TREES PLANTED WITHIN THE DISTURBED AREA SHALL HAVE A MINIMUM TREE CANOPY OF 75% OF THE ES-3: All erosions and sediment control measures are to be placed prior to or as a first step in the clearing. #4 p` Grade SECTION -B 0 Existing � � _. DISTURBED AREA 10-YEARS AFTER PLANTING. � CANOPY AREA REQUIRED a AFTER * 0AN = 6,750 SF ES-4: A copy of the approved erosion and sediment control plan shall be maintained on the site at all times. B A Pavement '--�-- CANOPY AREA PROVIDED = 6,813 SF -� o� �+�� maw l " 4. IF TREE CONSERVATION EASEMENT WITHIN THE AREA DISTURBED BY THE SEDIMENT BASIN IS VACATED ES-5: Prior to commencing land disturbing activities in areas other than indicated on these plans (including but not limited to, off -site 0 t he owner far review and approval b .he contractor hall submit a supplementary erosion control an to ow - . - - PRIOR TO REMOVAL OF SEDIMENT BASIN THEN SOIL COMPOST AMENDMENT AND TREE PLANTINGS WILL barrow or waste areas) the contra s p pp y �•�, - • pp Y oa 0 2% Sla e .;:. 2 * Min PROVIDE I" TUCK OR SUITABLY PROVIDE I" TUCK OR SUITABLY Ian a rovin acithorit . p REINFORCED OP END SECTION NOT BE REQUIRE®' p pp g y T T REINFORCED OP END SECTION T T Stone A Positive Drainage *Must extend full Construction To Sediment width of ingress Access I Trapping Device and egress operation PLAN VIEW 12' Min Stone Construction Access 70' M i n 3" SNl-2A Asphalt 7% -rinnp Positive Drainage To Sediment T Trapping Device SECTION A -A Filter Cloth NOTE: A minimum water tap of 1" must be installed with a minimum 1" ballcock shutoff valve supplying a wash hose with a diameter of 1.5" for adequate constant pressure. Wash waster must be carried away from the paved construction entrance to an approved settling area to remove sediment. All sediment shall be prevented from entering storm drains, ditches, or watercourses. i1� PANED CONSTRUCTION ENTRANCE (CE) SCALE: NTS d 50 - 6" d=12" SECTION A -A FILTER CLOTH KEY IN 6"-90; RECOMMENDED FOR APRON LINING SHALL BE ENTIRE PERIMETER 'E OUTLET TO NT AREA WITH I DEFINED CHANNEL OUTLET PROTECTION (OP) -510 SCALE: NTS J ZF1 ' 411 EMBED B" OF FILTER CLOTH IN TRENCH TO ANCHOR BOTTOM OF CI OTH- COMPACT THOROIICHI Y 2 SILT FENCE (SF) -510 SCALE: NTS Key Quantity Botanical name Common Name Planting Height Size / Cal. Canopy Total Canopy SHADE TREES QP 9 Quercus palustris Pin Oak 1 11' 13/4" 370 3,330 ET 9 Liriodendron tulipifera Tulip Poplar 12' 13/4" 387 3,483 Total= 6,813 ES-6: The contractor is responsible for installation of any additional erosion control measures as necessary to prevent erosion andCO sedimentation as determined by the plan approving authority. o � E- •• Z ES-7: All disturbed areas are to drain to approved sediment control measures at all times during land disturbing activities and during site development until final stabilization is achieved. ES-8: During dewatering operations, water will be pumped into an approved filtering device. 172 W w necessary repairs or cleanup to maintain the effectiveness of the erosion control devices shall be made Immediately. C.) Erosion Notes: Z 1) All Entrances except the approved construction entrance shall be blocked in such a manner as to not allow access to the site., �4Z 2) The developer shall reserve the right to install, maintain, remove and/or convert to permanent structure all erosion and sediment 1_1 n " control measures required by this plan regardless of the sale of any lot. n CQ C 3) A video camera inspection is required for all storm sewers and culverts that are deemed inaccessible to VDOT inspections and are to E- CV C'V be accepted into VDOT's maintenance and program and ownership. The video inspection shall be conducted in accordance with VDOT's Z a video inspection procedure and with a VDOT and/or county inspector present. In addition, if high -density polyethylene (HDPE) pipe or I- I- �, CQ pipe system, the contractor and a representative from the pipe manufacturer should hold a pre -construction meeting for installation. OD oo IT co ALBEMARLE COUNTY ENGINEERING ENE AL CONSTRUCTION NOTE FOR EROSION &SEDIMENT CONTROL ® Q G R C S S � 0�az f° e eek prior to the re -construction conference one week rior to the � �' 1. The plan approving authority must be noti led on w p p , p commencement of land disturbing activity, and one week prior to the final inspection. P4 o u Top of Dom 2. All erosion and sediment control measures will be constructed and maintained according to minimum standards and Pq W -0 Elev = 320.00' specifications of the Virginia Erosion and Sediment control Handbook and Virginia Regulations VR 625-02-22 Erosion and mergency Spillway = 319.00' Sediment Control Regulations. Z TOP OF DAM TO CREST: 2.00' Width = 15' TOP OF DAM TO 25 YR W.S.E. = 1.47' 9 3. All erosion and sediment control measures are to be placed prior to or as the first step in clearing. � � 4. A copy of the approved erosion and sediment control plans shall be maintained on the site at all times. Z CMP 5. Prior to commencing land disturbing activities in areas other than indicated on these plans (including, but not limits to, W 25 Yr. yYater Surface Elegy. 318.53' ANTI -VORTEX 2 off -site borrow or waste areas), the contractor shall submit a supplementary erosion control plan to the owner for review DEVICE 1 EXISTING GRADE and approval by the plan approving authority, Crest Elev = 318.00' Pond 6. The contractor is responsible for installation of any additional erosion control measures necessary to prevent erosion and Embankment sedimentation as determined by the plan approving authority. TEMP 3' DIA 7. All disturbed areas are to drain to approved sediment control measures at all times during land disturbing activities and Yr. Water Surface I.v. 16. 3' CMP RISER during site development until final stabilization is achieved. Compacted Soil 8. During dewatering operation water will be pumped into an approved filtering device. Dewafering Device 9. The contractor shall inspect all erosion control measures periodically and after each runoff -producing rainfall event. Any 6" Perforated PVC necessary repairs or cleanup to maintain the effectiveness of the erosion control devices shall be made immediately. 18 10. All fill material to be taken from an approved, designated borrow area. MIN :• •:•:•:... -Flow 11. All waste material shall be taken to an approved waste area. Earth fill shall be inert materials only, free of roots, ....... .......................... stumps, wood, rubbish, and other debris. Dr Volume Elevation= 315.50 12. Borrow or waste areas are to be reclaimed within 7 days of completion per zoning Ordinance Section 5.1.28. -� I (I II II ( I (II I I II ICI ( 6" orifice 17.5'-24"HDPE� 1.28% 13. All inert materials shall be transported in compliance with Section 13-301 of the code of Albemarle. Wet Volume Inv=3'15. Orifice p p 14. borrow, fill or waste activity involving industrial -type power equipment shall be limited to the hours of 7:OOAM to 9:OOPM. 15. Borrow, fill or waste activity shall be conducted in a safe manner that maintains lateral support, or order to minimize � any hazard to persons, physical damage to adjacent land and improvements, and damage to any public street because of � 4.5' MIN �- Inv = 314.22 slides sinking or collapse SCALE: NTS 'n Y i'• ,�'Lr L /3 �, A , j _ ���y t Oi ► 11 r i ' y. 1' , a . ' 4 .I , . ,a , t A °�� 'i a f �'�►„' - -- _. _ - ., ,. �_ .��+'�����v� Ali � '. � �r GS _ �S"tia;N�ti. �_. Y•*. , � jai i�� � N pq .. ME Abe; 7 x, Mh �f q • , S zw i� I F 'y♦ Tk k TRENCH TO ANCHOR BOTTOM OF 1,1 nTH. COMPACT THOROUGHLY ES-9: The contractor shall inspect all erosion control measures periodically and after each runoff -producing rainfall event. Any MESH SHALL BE A MINIMUM OF 14 GUAGE AND SHALL HAVE A MAXIMUM MESH SPACING OF 6". Refer to C-511 for routing calculations. Sediment Cleanout Volume = 13,888 CF / 4 - 3,472 CF Since the Sediment Basin is located within a 100-YR floodplain the sediment cleanout volume is half of what is required in order to minimize sediment that could be removed from basin during a 100-YR flood event. DRAINAGE DRY VOL. WET VOL. AREA PROVIDED PROVIDED 7.60 14424 13892 DRY VOL. WET VOL. REQUIRED REQUIRED 13748 13748 Elev(Ft) Storage(CF) 318.00 28,316 Dry Volume = 14,424 CF 316.00 16,300 315.50 13,892 Wet Volume 13,892 CF 314.00 7,025 312.00 0 Total Storage = 28,316 -Wet Volume = 13,892 Dry Volume = 14,424 Sediment Cleanout Point = 312.65 " Inv = 314.00 1 f Storage - 2,056 SF Es-1 16. The developer shall reserve the right to install, maintain, remove or convert to permanent Stormwater Management - CONCRETE BASE Facilities (where applicable) and all erosion control measures required by this plan regardless of the sale of any lot, unit, Bottom Elevation = 312.00 building or portion of the property. 17. Temporary stabilization shall be temporary seeding and mulching. Seeding is to be at 75 Ibs/acre, and in the months of )D) 5 TEMPORARY SEDIMENT BASIN (SB) September to February to consist of a 50/50 mix of annual ryegrass and cereal winter rye, or in March and April to -510 SCALE; NTS consist of annual Rye, or May through August to consist of German Millet. Straw mulch is to be applied at 80lbs/100SF. Alternatives are subject to approved by the County Erosion Control Inspector. 18. Permanent Stabilization shall be lime and fertilizer, permanent seeding, and mulch. Agricultural grade limestone shall be, applied at 90lbs/1000sf, incorporated into the top 4-6 inches of soil. Fertilizer shall be applied at 1000lbs/acre and TABLE 3.14-D CONCENTRIC TRASH RACK AND ANTI -VORTEX DEVICE DESIGN TABLE Riser Cylinder Minimum Top D m., Ieight,Minim m Size - in. Diameter, Thickness, inches Support Bar Thickness Stiffener inches gage 12 18 16 6 #6 Rebar or 11/2 x 16 ga. - 11/2 x 3/16 angle (F&C) 15 21 16 7 It „ " " - 18 27 16 8 21 30 16 11 „ „ 16 ga.(C), 14 - ga.(F) 24 36 16 13 „ „ " " It „ „ 1, 36 54 14 17 #8 Rebar 14 ga.(C), 12 a,(F) 42 60 16 19 " .48 72 16 21 111V pipe or 11/4 x 14 ga.(C), 10 - 11/4 x 1/4 angle ga.(F) 54 78- 60 90 14 29 11/2" pipe or 11/2 x 12 ga.(C), 8 - 11/2 x 1/4 angle ga.(F) 66 96 1 4 33 " I 2" pipe or 2 x 2 x 12 ga.(C), 8 2 x 2 x la 3/16 angle ga.(F) angle w/stiffener 72 102 14 36 1121/2 x 21/2 x 1/a angle 78 114 14 39 21/2" pipe or 2 x 2 x 1/4 angle 84 120 12 42 21/2`pipe or21/2x 21/2x21/2x 21/2 x 1/4 angle 5/16 angle Note,: The criterion for sizing the cylinder is that the area between the inside of the cylinder and the outside of the riser is equal to or greater than the area 'inside the riser. Therefore, the above table is invalid for use with concrete pipe risers. Notez: Corrugation for 12%36" pipe measures 21YV x 1/a'; for 42" -"'the corrugation measures 5" x 1" or 8" x 1". Note3: C = corrugated; F = flat. Source: Adapted from USDA-SCS and Carl M. Renshaw Drainage Products Information. consist of a 10-20-10 nutrient mix. Permanent seeding shall be applied at 180 Ibs/acre and consist of 95% Kentucky 31CO or tall fescue and 0-5% perennial ryegrass or Kentucky bluegrass. Straw mulch is to be applied at 80lbs/100sf. Alternatives are subject to approved by the County Erosion Control Inspector. 19. Maintenance: all measures are to be inspected weekly and after each rainfall. Any damage or clogging to structural measures is to be repaired immediately. Silt Traps are to be cleaned when 50% of the wet storage volume is filled with sediment. All seeded areas are to be re -seeded when necessary to achieve a good stand of grass. Silt fence and diversion dykes which are collecting sediment to half their height must be cleaned and repaired. 20. All temporary erosion and sediment control measures are to be removed within 30 days of final site stabilization, when Z measures are no longer needed, subject to approval by the County Erosion Inspector. 2 02 21. This plan shall be void if the Owner does not obtain a permit within 1 year of the date of approval. (Water Protection � � Ordinance Section 17-204G) 22. Permanent vegetation shall be installed on all denuded areas within nine (9) months after the date the land disturbing activity commenced. (Water Protection Ordinance Section 17-207B) w A PERMANENT & TEMPORARY STABILIZATION EROSION MAINTENANCE SCHEDULE 1.The Site Superintendent or his representative shall make a visual 0 U Permanent seeding shall be applied within seven (7) days after inspection of all erosion and sediment controls on a daily basis until final grading is completed. the site is stabilized and especially after a heavy rainfall to assure that o TEMPORARY SEEDING SPECIFICATIONS: all controls are in place and that none have been damaged. Any z February 16 through April 30: damaged control shall be repaired prior to the end of each workday to Use Annual Ryegrass at 60 to 100 Ibs/acre. include re -seeding if necessary. May 1 through August 31: 2. All silt trapping devices shall be cleaned out at 50 percent capacity Use German Millet at 50 Ibs/acre. and sediment shall be disposed of by spreading on site or hauling away if not suitable for fill. Z �+ September 1 through February 15: Use a 50/50 Mix of Annual Rye and Winter Rye at 50 to 100 3. Gravel outlets shall be checked regularly for sediment buildup that may lbs/acre. prevent drainage. Controls shall be inspected and repaired after each I� ,� PERMANENT SEEDING SPECIFICATIONS: rainfall and cleaned if sediment has accumulated to half of the device's 0 February 16 through April 30: original height, I4 E=-, Kentucky 31 Fescue - 128 Ibs/acre; Annual Rye 20 Ibs/acre. 4. All earthen structures such as diversion dikes and berms shall be 0 C) � checked daily during construction for breaching by equipment Repairs ( Z May 1 through August 15: shall be made immediately. 0 Kentucky 31 Fescue - 128 Ibs/acre; Foxtail Millet - 20 V) Ibs/acre. 5. Silt fences shall be checked after each rainstorm to assure they have 0 not fallen or become clogged with silt. All repairs shall be made �' August 16 through October 31: immediately. Kentucky 31 Fescue - 128 Ibs/acre; Annual Rye - 20 Ibs/acre. 6. All seeded areas shall be inspected regularly to see that good stand is E�, maintained. Areas will be re -fertilized and re -seeded as necessary. November 1 through February 15: r� Kentucky 31 Fescue - 128 Ibs/acre; Winter Rye - 20 7. After construction operations have ended and disturbed areas have a4 Ibs/acre. been stabilized, all berms and sediment -trapping devices may be SKEET NO MULCHING SPECIFICATIONS: removed after removal, the ground shall be restored to its natural or Straw or hay at a rate of 2 tons/acre. Must be anchored. Spread blower by hand. proposed condition to include establishment of permanent vegetation. Removal of any control is contingent upon approval of the County 510 with mulch or Inspector, SHEET 3 of 4 ME 370 350 340 330 320 310 STR-1 STR-1 A nSTR- STR-2 STR-3 STR-4 STR 5 o CD W Lod c� to ill N� r Pr} cn r- cn ' to L0 Co � d- r`- I�r)� pp Nr cars vi aio�� I a�� I I t• p li In I �?� 11 c� I ��N rr? �rl - �- I n1­3 o r C7 � N9 CD ri II O tll n I M + r7 � N II � 0 - -F N N P7 I- II z � �S tom_ t� � r" 3 � C3 -I N-) II III Cz ' z �� z ~ cn� z ��zQ��a� z ~�cCzz L Mzz Exist. 8" water main will _ require a test pit for actual depth. Adjust storm sewer Exi t.Gr ide _ - HGL as necessary to prov de a minimum separation of 1.0' New 8" PVC _ f-1 Sanitary Exist. 30 anitary sewer will -- - 13.68g'�24"HOPE - require a t st pit for act al x. 8" DI depth. Adjust storm sew r Water PE@ 9, as neces ary to provide a Inv=319.8 / 2 minimum leparation of 1.5' �Va Temporary 3ediment Basin/ ro (• ' '-24" N @1.28% - 17.5 DPE ®1.25% 0+ 00 0+50 1 SEDIMENT BASIN PROFILE -511 HORIZONTAL SCALE: 1" = 30' VERTICAL SCALE: 1" = 10' 1 + 0 0 1+50 2+00 2+50 3+00 Ex. RWSA 30" Clay Sanitary Sewer Inv = 310.60 SEQUENCE OF SEDIMENT BASIN REMOVAL 1. STABILIZE ENTIRE SITE AND OBTAIN APPROVAL FROM EROSION INSPECTOR TO REMOVE SEDIMENT BASIN. 2. DEWATER AND MUCK OUT SEDIMENT FROM BOTTOM OF SEDIMENT BASIN. 3, INSTALL REMAINING PORTION OF STORM PIPE BETWEEN STR-1A AND STR-1B. 4. BACKFILL SEDIMENT BASIN AS REQUIRED TO MATCH PREVIOUSLY EXISTING GRADE. 5. Area disturbed by grading for the sediment basin must have soil amendment and tree plantings. See C-510 for SOIL AMENDMENT NOTES 3+ 50 L'L�■ -1--L: Hydrograph Report Hydrograph Report 2 Hydraflo,,v Hydrographs Extension for Autodesk® Civil 3DOO by Autodesk, Inc. v2020 Tuesday, 04 / 21 / 2020 Hyd. No. 1 Woolen Mills Hydrograph type = SCS Runoff Peak discharge = 3.906 cfs Storm frequency = 2 yrs Time to peak = 12.10 hrs Time interval = 2 min Hyd. volume = 16,601 cult Drainage area = 7.600 ac Curve number = 60 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of cone. (Tc) = 20.00 min Total precip. = 3.66 in Distribution = Type li Storm duration = 24 hrs Shape factor = 484 Q (Cfs 4.00 2.00 1.00 Hydraflow Hydrographs Extension for AutodeskO Civil 31)7 by Autodesk, Inc. v2020 Tuesday, 04 f 21 12020 Hyd. No. 2 Woolen Mills Routed Hydrograph type = Reservoir Peak discharge = 0.242 cfs Storm frequency = 2 yrs Time to peak = 16.77 hrs Time interval = 2 min Hyd. volume = 16,527 cuft Inflow hyd. No. = 1 - Woolen Mills Max. Elevation = 316.93 ft Reservoir name = Woolen Mills Sed Basin Max. Storage = 21,798 cuft Storage Indication method used. Wet pond routing start elevation = 315.50 ft Q (Cfs) Q {CfS; 4.00 4.00 3.00 3.00 2.00 1.00 0.00 �, 0.00 0 2 4 6 8 10 12 14 16 18 20 22 24 26 Hyd No. 1 Time (hrs) 2-YEAR ROUTING CALCULATIONS SCALE: NTS 2,00 1.00 Q (cfs) 4.00 3.00 2.00 1.00 0,00 - 0,00 0 6 12 18 24 30 36 42 48 54 60 Hyd No. 2 Hyd No. 1 11.1_i_11.1.1', Total storage used = 21,798 cuft Time (hrs) 4+00 370 360 350 330 320 310 STR-1 STR-2 STR-3 STR-4 STR--S � o oar' P!) �CD��� Pr'1 N r �� Q I �? r- I u? f� I I c, 1 t� N n r I rn to I I M 0± Ir7 toLe-i r . ��'t ~ rr)T II -I �� �� +M N���� II -o +M r� II II zzC7 �o Lo �� II II > - .aCC� ill to ��� c~rn� zz c~nc'- ci �z Exist. 8" water main will 1 require a test pit for actual ep just storm sewer - - HGL as ne essary to provide a minimurin separation of 1.0' f P-----New 8" PVC Sanitary Exist. 30' sanitary sewer will IS-1 13.08'-24"HDPE _- require a test pit for actual x. 8" DI 1 ���® 0.69% depth. Adjust torm sewer WaterP�® as necessary o provide a Inv=319.8 minimum separ tion of 1.5' _ - A ��, it 1 ' 1 Ex- RWS 30" Clay IAIN Sanitary Sewer Inv = 31 .60 0+00 0+50 2 APPROVED STORM PROFILE -511 HORIZONTAL SCALE: 1" = 30' VERTICAL SCALE: 1" = 10' Hydraflow Hydrographs Extension for Autodesk© Civil 3GD by Autodesk, Inc. v2020 Hyd. No. 1 Woolen Mills Hydrograph type = SCS Runoff Storm frequency = 25 yrs Time interval = 2 min Drainage area = 7.600 ac Basin Slope = 0.0 % Tc method = User Total precip. = 6.81 in Storm duration = 24 hrs 1 +00 1 +50 2+00 2+50 APPROVED STORM SEWER PROFILE PER WPO 201600072-AMENDMENT 2 3 Tuesday, 04 f 2'1 / 2020 Peak discharge = 21.05 cfs Time to peak = 12.10 hrs Hyd. volume = 68,142 cuft Curve number = 60 Hydraulic length = 0 ft Time of cone. (Tc) = 20.00 min Distribution = Type II Shape factor = 484 Woolen Mills Q (cfs} Hyd. No. 1 - 25 Year Q (cfs) 24,00 20.00 16.00 12.00 8.00 4.00 0 00 24.00 20.00 16.00 12.00 8.00 4.00 0.00 0 2 4 6 8 10 12 14 16 18 20 22 24 26 - Hyd No. 1 Timie (hrs) 25-YEAR ROUTING CALCULATIONS SCALE: NTS 3+00 3+50 4+00 �� z Hydrograph Report Hydraflow Hydrographs Extension for Autodesk© Civil 3D© by Autodesk, Inc. v2020 Tuesday, 04 f 21 12020 Hyd. No. 2 Woolen Mills Routed Hydrograph type = Reservoir Peak discharge = 16.55 cfs Storm frequency = 25 yrs Time to peak = 12.20 hrs Time interval = 2 min Hyd. volume = 68,068 cuft Inflow hyd. No. = 1 -Woolen Mills Max. Elevation = 318,53 ft Reservoir name = Woolen Mills Sed Basin Max. Storage = 32,079 cuft Storage Indication method used. Wet pond routing start elevation = 315.50 ft. Woolen Mills Routed Q cfs ) Hyd. No. 2 -- 25 Year Q (cfs) 24.00 20.0a 16.00 12.00 8.00 4.00 a 00 24.00 20.00 16.00 12.00 a.00 4.00 0.00 0 4 8 12 '16 20 24 28 32 36 40 ---•--- _ Hyd No. 2 Hyd No. 1 F LLCET, Total storage used = 32,079 cuft Time (hrs) co • 1 i � G - • .r i