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HomeMy WebLinkAboutWPO202000001 Plan - VSMP WPO VSMP 2020-08-28U 1. Owner/Developer: Tandem Friends School 279 Tandem Lane Charlottesville, VA 22901 434.296,1303 2. Engineer: Woolley Engineering 210 5th Street NE Charlottesville, Virginia 22902 434.973.0045 3. Train Architects 612 Jefferson Street Charlottesville, VA 22902 434.293.2965 4. Parcel Information: TMP 91-2A, n/f The Tandem School (24.508 acres) Magisterial District: Scottsville Current Use: Private School Deed Book 1623, Page 649 Steep Slopes: Managed Steep Slopes 5, Existing Zoning: R1 Residential Special Use Permits: SP199600006, SP199600025, SP199600049 SP199700053,SP200800065,SP201300019,SP201500021,SP201900007 Zoning Overlay Districts: Entrance Corridor, Airport Impact Area, and Steep Slopes- Managed. 6. R1 Zoning Setbacks: Front Minimum: Closest setback of an existing main building within 500 ft. in each direction along the some side of the street fronted (Mill Creek Drive). Front Maximum: None Side Minimum: 10 ft. Side Maximum: None Rear Minimum: 20 ft. Rear Maximum: None 7. Planned Land Use: Addition of a new outdoor pavilion building. (3267 sq. ft. = 0.31 % of site) 8. Proposed Building Statistics: Proposed Use: Outdoor Pavilion Number of Floors: 1 Gross Building Square Footage: 3267 sq. ft. Proposed Ridgeline Height: 27.5 ft. Appurtenance Cupala Height: 34 ft. Maximum Building Height: 35 feet Maximum Proposed Impervious Area: 4,919 sq. ft. 9. Adjacent Properties: TMP 91-2C (1), n/f The Nameless One LLC C/O Aaron Van Duyne III Deed Book 3977, p 6601 Current Use: Vacant Residential Land TMP 91-8, n/f Tandem Friends School Deed Book 4612, p 158; R1 Current Use: Single Family TMP 91-10, n/f County of Albemarle C/O Finance Admin. Rm. 149 Deed Book 1979, p 044; R1 Current Use: Single Family TMP 91-11, n/f County of Albemarle C/O Finance Admin. Rm. 149 Deed Book 1979, p 044; R1 Current Use: Single Family TMP 91-2E, n/f County of Albemarle C/O Finance Admin. Rm. 149 R15 Current Use: Fire Station (Staff) TMP 91-2, n/f County School Board of Albemarle Deed Book 1740, p 559; R15 Current Use: High School (Entire) WATER PROTECTIONORDINANCE PLAN W7 ALBEMARLE COUNTY, VIRGIN/A SCOTTSVILLE MAGISTERIAL DISTRICT 10. Datum and Benchmark Reference A. Topographic and physical data based on surveys by: Dominion Engineering. Physical Topographic survey of a portion of Tandem Friends School dated April 21, 2016. B. Kirk Hughes and Associates completed select physical and boundary improvements composite of topographic and physical data from Dominion Engineering. Please see sheet C2.0. C. The topography and existing site conditions were verified by Woolley Engineering on February 20, 2020. 11. General Construction Notes: A. The abbreviation V.D.O.T. made hereafter refers to the Virginia Department of Transportation. The term County refers to the County of Albemarle, Virginia. B. Prior to any construction within any existing public right-of-way, including connection to any existing road, a permit shall be obtained from the Virginia Department of Transportation (VDOT). This plan as drawn may not accurately reflect the requirements of the permit. Where any discrepancies occur the requirements of the permit shall govern. C. All materials and construction methods shall conform to current specifications and standards of VDOT unless otherwise noted. D. Erosion and siltation control measures shall be provided in accordance with the approved erosion control plan and shall be installed prior to any clearing, grading or other construction. E. All slopes and disturbed areas are to be fertilized, seeded and mulched. F. The maximum allowable slope is 2:1 (horizontal:vertical). Where reasonably obtainable, lesser slopes of 3:1 or better are to be achieved. G. Paved, rip -rap or stabilization mat lined ditch may be required when in the opinion of the County Engineer, or designee, it is deemed necessary in order to stabilize a drainage channel. H. All traffic control signs shall conform with the Virginia Manual for Uniform Traffic Control Devices. 1. Unless otherwise noted all concrete pipe shall be reinforced concrete pipe - Class III. J. All excavation for underground pipe installation must comply with OSHA Standards for the Construction Industry (29 CFR Part 1926). K. Retaining walls greater than 3 feet in height require a separate building permit. Walls exceeding 4 feet In height require a stamped engineered design also. Walls require inspections as outlined in the USBC. L. Each outdoor luminaire equipped with a lamp that emits 3,000 or more initial lumens shall be a full cutoff luminaire and shall be arranged or shielded to reflect light away from adjoining residential districts and away from adjacent roads. The spillover of lighting from luminaires onto public roads and property in residential or rural areas zoning districts shall not exceed one-half footcandle. 12. General Water and Sewer Conditions (1) Work shall be subject to inspection by Albemarle County Service Authority (ACSA) inspectors. The Contractor will be responsible for notifying the proper Service Authority officials at the start of the work. (2) The location of existing utilities across the line of the proposed work are not necessarily shown on the plans, and where shown, are only approximately correct. The Contractor shall, on his own initiative, locate all underground lines and structures as necessary. (3) All materials and construction shall comply with the current edition of the General Water & Sewer Construction Specifications, as adopted by the Albemarle County Service Authority. (4) Datum for all elevations shown in National Geodetic Survey. (5) The Contractor shall be responsible for notifying Miss Utility (dial 811 or 1-800-552-7001). (6) All water and sewer pipes shall have a minimum of three and a half (3.5) feet of cover measured from the top of pipe over the centerline of pipe. This includes all fire hydrant lines, service laterals, and water lines, etc. (7) All water and sewer appurtenances are to be located outside of roadside ditches. (8) Valves on dead-end lines shall be rodded to provide adequate restraint for the valve during a future extension of the line. (9) ALL water lines, sewer lines, and fire lines from the main to the structure MUST have a visual inspection performed by the building department. (10) All roof drains shall discharge in a manner not to cause a public nuisance and not over sidewalks. (11) The ACSA should be contacted 3 days prior before water/sewer connections are made on ACSA utilties to schedule and inspector. 13. Stormwater Management A. Stormwater quality and quanity for the new pavilion will be treated by a bioretention level one with a level spreader to convert flows to sheetflow. A small portion of the site along the propoed access drive will pass through a gravel diaphragm which will convert these flows to sheetflow. B. This site is located in the Moores Creek Watershed. 141. Parking The addition of the new pavillion building will not alter the number of employees or students on the subject property. This plan does not propose any changes to the existing parking for this reason. Existing parking: 116 spaces counted 15. Site Lighting: There is no site lighting proposed for this amendment. APPROVED by the Albemarle County Community evelop�nent Department Date &/'I- ? / 2o2a File_ w Po')_02 e, o© I_ VICINITY MAP co SITE SConsv �ti Rp jOF,g 6�FO R SCALE. I " = 1000' Im C 1.0 Cover ❑ C1.1 Site Development Exhibit IM C2.0 Existing Conditions Exhibit EM C2.1 Existing Conditions Exhibit Cont. ❑ C3.0 Demolition Plan EM C4.0 Layout Plan C5.0 Site Plan 11 C6.0 Stormwater Management Plan 111 C6.1 Utility Profiles IM C7.0 General Details ❑ L1.0 Landscape Plan 11 ES1.0 Erosion and Sediment Control Narrative IM ES2.0 Erosion and Sediment Control Plan ES3.0 Erosion and Sediment Control Details gl Filled Box Indicates Drawing Included in Set C XX 1 7 NooLLEY ENGiNEERiNG Consulting Civil Engineers 210 5th Street NE Charlottesville - Virginia 22902 (434) 973.0045 www.Woolley-Eng.conn Dwner: The Tandem School 279 Tandem Lane Charlottesville, Virginia 22902 P: (434) 296-1303 VSMP/WP0 PLAN J 0 0 d Z i Z a.. W Lim U. W L.LI Z 0 V OVER SHEET Job Number: 19090 *H OF D V C V. WOOLL9Y LIC. NO. 370 B 17 2020 �`sS,tONAL Date: December 30, 2019 Revision: April 17, 2020 June 24, 2020 J u ly 28, 2020 August 17, 2020 .Scale: As Noted Sheet No.: *0 1 of 14 copyright a 2020 by Woolley Engineering ix X.: lx: x1xMiiiii; i I-MMANU41 SIGHT DISTANCE EASEMENT DB1590 PC 434 ACSA WATER VARIABLE WIDTH 3 3433 EASEMENT 261 PERMANENT SLOPE --_,,, PC EASEMENT DB1590 PC ♦ 434 LS TE 0 'w J`UELIAH 11IT 0 0 24.0-j -3,3 CIEDA -CEDAR 18 R 24 213 -W SATE- CEDAR 24 5`14W E�, L-CEDA •'TR 24 15" �b�H, 0 OP 36 IDI. WA RLINE IDI.,7' - - - - - - - - 52 �O' GIM % MISS-UMUTY 15 'CEDAR-- - I I I" 1%1:DAR"24---TAARKS LOCATED M3.1j 52.0 IP RAP FFE � %, I-- — — rl, FE 2 GM N FH ED �18 R- 9WF '70, CEDAR Mr 'EDAR ------ F C3 24 AKAINU LOT FRAME SHED kp 20 S�Ib,\ IP' fA XIMATE *LP SNEI IAKT - �-y WER - - - - - - //1NO MISS UTILITY N MARKS LOCATED D SIGN SIGN `TR 40 0. SIGN MAG 48 ' P SIGN b -R 48 co HCP SIGN;Z LP WPF IGN LP* *LP/ o. P .,is -,/ POP 4 POP P (DPOP 4 *LP U. GAS POP 36) OAT Un[ICC' POP ,�`Pop 8 (D @POP 16 *LP " 8 550.1 5223, 15 HQRE I(TYP.) WooLLEY ENGINEERING —SSMH H Consulting Civil Engineers 210 5th Street NE Charlottesville -Virginia 22902 (434) 973.0045 www.WooJley-Eng.com Owner: The Tandem School 279 Tandem Lane ♦ Charlottesville, Virginia NPS 22902 P: (434) 296-1303 SDG Ln -T- IRS �,ffl A ACSA AiR-,�,� TR -6 TR 2 -A� SHOWN IN CG? EASEMENT 1611 D13 fft-n 602 r D13 3433 PC 261 18 EMORI C� sy-CID, TR A1 TR 3 TRjTR 1� TR DwI 549.0 #305 4! 9 a TR 5 .�TR 24 FFE AME SSMH ()TR 548.9 ILDING 4. R FFE PORCH 0 'OFO R 24 CEDAR 15 4.6L5 .3 0, V WtLL\ FIFE 6.0, PAVED 4i 1. co DRIVE #295 TR 3 41. SI 6RlCK%V 5553 M- '12 APPR MATE Lot;�ON ♦O�*\ zo -J� 3 -550. 1 ip r7;WASEMENT 7 2.5 LaA4�&' FFFE POWER NY CTRIC F , 42-d /DB 1850 P� Ilk t Cm 5-w 8 IVA3 " r (1 1 W 6 1 qrp b.01 c k 548.3 (CDkTR FFE 23-S CONIC[] METAL 549.2* IMMATE-1:066h-ATJOISL GF- 548.3 CRAWL TRAILOR -Jsl� 'I d FFE 5528 1`11�y p6k rm r- %IIKIV M FFE I' PO" COMPANY EASEMENT 1. 537.2 541.4 DB 811 PC 604 �.47.22! FFE FFE IM \10A 1, I V\e I BF--�154 2 2 STORY SPU wwo ER OCK BLOC 1 SHEDS C110a. 0" V.,536.1y 74.6 S WPF L I * 4 TR HE-Uj E T. -FSMH C .11 SSMH D'IV ur. rALMM ACSA SANITARY SEWER MTU WOODUNE (TYP.) EASEMENT D v­1 . . . ...... . �iuw P EASEMENT SIGN CID' 1�3 DB 1595 PC C�) 676 1 Ikw TAR r NES"HAS BEEN PREPARED 3.) r:':LJ WITHOUT TI-Ilt904WT��TITLE REPORT AND DOES NOT ::::: OF" "A ' NECESSARILY SHOW ALL ENCUMBRANCES ON THE TITLE. HATCHED AREA REPRESENTS LIMITS OF MANAGED STEEP SLOPES I NM I IMMIN I OWMCE I ILI IN 5n4W W 113.01- 1 F G TANDEM LANE PRIVATE ROAD SDMH 40' 0 40' 80' 120 FEET SCALE: 1 40' VSMP/WPO NVA"k EXISTING CONDITIONS EXHIBIT Job Number: 19090 Date: December 30,2019 Revision: February 27, 2020 April 17,2020 June 24, 2020 July 28, 2020 August 17, 2020 Scale: 1" = 40' Sheet No.: 3 of 14 copyright 0 2020 by Woolley Engineering lu a8- sm Q . 1BY1 0 Yw-�. f6 V w W.D. SEWARD. LIC No,1934 Q4 `21-15 �4'0 'S U RN AQ> cad u.t I Pal pet m 0 W LU z > ui SANITARY SEWER ELEVATION KEY' SSMH A.. J,]M F C SJPr H Ivl1 § kT TOP=.545.09' TOP=538.53' TOP=515,22' ` TOP516.1,2'' 8"' PVC II''JJV OUT-537.64' Si' PVC INV IN= 5 1.13` 8'" PVC IINV'IN= 51, .47" 8'i PVC' INV IN=51�7.85' 8" PVC INV OUT=531,054` 8" PVC INV OUT=513.34" 8" PVC INV OUT=506.75 SSMH I TOP =539.23' S$MH 0 Sw E SSMH 8`1 PVC ,INV IN--5.34.I3' TOP=520R30' TOP=5M 23' TOP-510.3e 8r7 PVC O.UT=534.00i 8u PVC INN IN 515,E 1 f 8 #i PVC. INN 8ii PVC INV IN=5,05.83r 8" PVO INV OU`f=515.55' 8" PVC INV QUT=512.13!' 8'i PVC' INV 0 T�=505;74'' WOOL ,I ,F Y ENGINEERING Consulting Civil Engineers 210 5th Street NE Charlottesville • Virginia 22902 (434) 973.0045 www.Woouey-Eng.com Owner: The Tandem School 279 Tandem Lane Charlottesville, Virginia 22902 P: (434) 296-1303 VSMP/WPQ PLAN J 00 Q Z UZIry Cl,Lij ��w w m c�a `L � o w z Z � Q E-- LAYOUT PLAN Job Number: 19090 TM OP t ENO X TOOLLIfY LIC. NO. 3708 kV8-17-2020 A? IO NA Date: December 30, 2019 Revision: February 27, 2020 April 17, 2020 June 24, 2020 J u ly 28, 2020 August 17, 2020 Scale: III =20' Sheet No.: C4*0 b of 14 copyright 0 2020 by Woolley Engineering WooLLEY ENGINEERING Consulting Civil Engineers 210 5th Street NE Charlottesville • Virginia 22902 (434) 973.0045 www.Woolley-Eng.com Owner: The Tandem School 279 Tandem Lane Charlottesville, Virginia 22902 P: (434) 296-1303 VSMP/WPC PLAN SITE PLAN Job Number: 19090 OP p LIC. NO. 3708�r' kq.tB-17-2020 ONAL _S Date: December 30, 2019 Revision: r-earuary zi, zuzu June 24, 2020 J u ly 28, 2020 august 17, 2020 Scale: 1"=20' Sheet No.: C5.0 7 of 14 copyright 0 2020 by Woolley Engineering EXISTING POST -DEVELOPMENT MAP COMMUNITY HALL BUILDING RE-R TE EX ING ROOF Rat LEADERS ' (SEE C5.0) r a " - D.A. 02 FOR BIOFILTER / 0.195 AC. IMPERVIOUS: 0.006 AC. PRETREATMENT CELL°" (85-SF_ 2' DEPTH AT INGRESS 1' DEPTH AT EGRESS PROP®SED"CS TDOOR "� PAVILION -- FFE = 537.3 RIPRAP LINED CHANNEL --- DOWNY SERVICEBERRY (2) - 532 SW M FAC I L IT`S , r �, , ...• ,...' 1 N ',o~ • �..-, • ."- '-1 "'� =AifC ESS PATH v t , -r y [,. ,� err , s' t 1. ! 1 r . • ' � �'_"'_„, _ �..�"'"'"" , ; a , � r i. � � '+ .rr' y a 1 V 1 1 r q...*."°-+ '.i•.. ;, � /( ,..'""°.... r"� 1 r 1 }.:: t 1 �• • M�"'r x E r r '•'-w,^-11 j "1"Y" ^777r+� ,.w...'"".`, f P r 1 • ..y- ." +. ��^_• I ^ �,✓ EN r +�� , , , ... __._. _ ... ,.;, >'. ,. r i j:. ,: 1 ! r,.i t r J; : 1 •t.�,rr•. _.3.t`,F i t s l.. „"""".".. .. a ,. • x �.:• �1 r,� r,F r..t t r ,.t ,_ LIMITS ASS ... ..• ��,..-.� r _ .e®.... 7riya: °�.,,,`".,^+ ,^+ r ^'r , r• , �. ✓ "+,°"�. r ;::: t " : r 1 :,. e t r r # 1 r ,:.,w-�-.:.-'«�^�» '"T'7"`"� r;; , }, r ;:. ♦ ;. . � .yam--.._ '- , rR r "^a -. 1 y � , , , r ~'r^'""�' r ,. r 7 ., :., .':;- 1 y, 'r~•' ...-.---^"""':•_• i ...,-e,..,., """^-+`- : r r,, d r , • t,s w+� z t , PRE -DEVELOPMENT MAP N. APPROXIMATE LIMITS OF - _X. DRAINAGE AREA . ET D.A. 01 FOR BIOFILTER 0.137 AC. IMPERVIOUS: 0.114 AC. �,- TIE-IN EXISTING PVC STORM DRAIN PIPE � \\- PROPERTY LINE / SCALE: 1 " = 100' `.,'+q ^' +.+.-+r„ rows "w.,.., .+.'..•.r -�. • - Q - > - 6" x 6" LANDSCAPE TIMBER LEVEL SPREADER ALONG ENTIRE DOWNHILL #4 REBAR REINFORCEMENT LENGTH TOP ELEV = 520.75 FILTER FABRIC - ENDS TO BE BURIED FILTER FABRIC TO EXTEND lA MIN. OF 6" BELOW GRADE V BEYOND TOP OF SLOPE -------------------------- ------ 3' 24" BIORETENTION SOIL MEDIA .' .x , ,.. -- -• .520 .� ""''- - BIOFILTER UNDERDRAIN OUTFALL WITH - - --- --- "RIPRAP 1 xl x0.5 DEPTH OF 3 RIVER ROCK 2 - M --- -- APPROXIMATE LIMITS OF DISTURBANCE ,...- '""� ' _ (�)` .�RIVER BIRCH LEVEL SPREADER - 61LENGTH GROUNDCOVER MIXTURE GRAVEL DIAPHRAGM POINT OF ANALYSIS (SEE DETAIL BELOW) LEVEL 1 BIORETENTiON FACILITY (285 SF) �..� HATCHED AREA DENOTES LIMITS OF PROPERTY LINE BIORETENTION AREA (57' x 6) 25 YR STORM WSE = 520.77' 10 YR STORM WSE = 520.77' .2 YR STORM WSE = 520.75' 3" OF #78 AGGREGATE 12" WASHED #57 AGGREGATE ABOVE UNDERDRAIN BIORETENTION SECTION VIEW N.T.S. ,..r .....�... ��., .., __ SIDES OF DRIVE ACCESS TO BED STABILIZED WITH GRASS MIN 6" OF VDOT #57 GRAVEL ON ROAD SURF ROAD WITH GRAVEL DIAPHRAGM SECTION VIEW N.T.S. -� EXISTING WOODED AREA `NON -WOVEN GEOTEXTILE FABRIC GRAVEL DIAPHRAGM MIN WIDTH: 2' MIN DEPTH: V VDOT #3 GRAVEL Stormwater Management Narrative The proposed site is designed to limit the impact on the subject parcel by utilizing existing impervious surfaces for the construction entrance and by installing grass pavers. In order to address the proposed impervious surfaces, a Level 1 Bioretention Facility is proposed to treat runoff quality and quantity. Stormwater Quality: Yard drains and select grading will be utilized to direct the majority of the stormwater runoff from the proposed pavilion directly into the proposed pretreatment cell which will flow into the level one biofilter. The biofilter will have a level spreader along the entire downhill length to allow flows exiting the biofilter to be sheet flow. Stormwater Quantity: The building adjacent to the proposed pavilion currently has three roof drain leaders that exit onto the lawn as overland flow. The proposed site plan intends to tie-in the existing roof drain leaders to an underground pipe that will exit into rip rap, ultimately reducing runoff velocity. Stormwater entering the proposed bioretention facility will be treated for quality before being slowly released through infiltration and exfiltration and through the use of a level spreader. The proposed gravel road will have a gravel diaphragm that will be utilized to treat the quanity of stormwater exiting this area of the site. All proposed runoff from the site will convert to sheet flow to meet VSMP regulations under Part II B, Water Quantity (9VAC25-870-66 D.) Gravel Diaphragm & Level Spreader Maintenance and Inspection Schedule (To Be Done Quarterly) 1. Ensure flows through the gravel diaphragm or level spreader do not short-circuit the overflow control section 2. Check for debris and sediment and clear any build up at the top of the gravel diaphragm or level spreader 3. Check to ensure foot or vehicular traffic does not compromise the gravel diaphragm 4. Look for scour and erosion within the area surrounding the gravel diaphragm or level spreader 5. Clean out sediments from Level Spreader forebays and flow splitters 6. Vegetative density should exceed a 90% cover in the boundary zone or grass filter 7. All vegetation surrounding the gravel diaphragm and level spreader should be mowed or weed wacked a minimum of twice per year 8. Ensure that integrity of timber level spreader has not deteriorated. Remove and replace level spreader timbers if the timbers have deteriorated. LEVEL 1 BIORETENTION FACILITY CALCULATIONS CONTRIBUTING DRAINAGE AREA (ACRES) 0.33 S.A.=TV/STORAGE DEPTH ELS LENGTH = 13' / CFS PRE-TREATMENT: PRETREATMENT CELL (SQUARE FEET) 86 PRETREATMENT CELL (CUBIC FEET) 142 BIORETENTION SIZING: MAX CONTRIBUTING IMPERVIOUS SURFACE (AC.) 0.12 DESIGN SURFACE AREA (FT'): 285 STORAGE DEPTH (FT): 2 SOIL MEDIA 2 GRAVEL 1.25 SURFACE STORAGE 1 BMP TREATMENT VOLUME CUBIC FEET): 570 REQUIRED S.A. SQUARE FEET): 285 LEVEL SPREADER: DESIGN FLOW (25 YEAR STORM - CFS) 2.31 MINIMUM LEVEL SPREADER LENGTH (FT): 30.03 PROPOSED LEVEL SPREADER LENGTH (FT): 60 Bioretention Maintenance and Inspection Schedule (To Be Done Quarterly) l . Check to see if 95% groundcover or vegetation density has been achieved in the bed and banks of the biofilter. 2. Check for sediment buildup at curb cuts, gravel diaphragms or pavement edges that prevents flow from getting into the bioretention swale, and check for other signs of bypassing. 3. Check for any winter- or salt -killed vegetation. 4. Check inflow points for clogging or accumulated sand, sediment, and trash, and remove it. 5. Inspect side slopes and grass filter strips for evidence of any rill or gully erosion, and repair it. 6. Check the bioretention swale for evidence of excessive ponding or concentrated flows, and take appropriate remedial action. 7. When sediment accumulation is noted, look for any bare soil or sediment sources in the contributing drainage area, and stabilize them immediately. 8. Check for clogged or slow -draining soil media, a crust formed on the top layer, inappropriate soil media, or other causes of insufficient filtering time, and restore proper filtration characteristics. 9. Inspect upstream and downstream of check dams for evidence of undercutting or erosion, and remove trash or blockages at weepholes. 10. The groundcover shall be mowed and/or weed wacked every quarter. MEDIA SURFACE ELEVATIONS (FT) LEVEL SPREADER TOP 520.75 SOIL MEDIA - TOP 519.75 SOIL MEDIA - BOTTOM 517.75 PEA GRAVEL - TOP 517.75 PEA GRAVEL - BOTTOM 517.50 GRAVEL LAYER - TOP (VARIABLE) 517.75 GRAVEL LAYER - BOTTOM 516.50 Biofilter Contributing Drainage Calulotions: Total DA 1 = 5985.3 sf (0,137 AC) Impervious = 4983.7 sf (0.114 AC) Pervious = 1001.6 sf' (0.023 AC) Total DA 2 = 8481.8, sf (0.195 AC) Impervious = 271.9 sf (0.006 AC) Pervious = 8209.9 sf' (0.188 AC) Total DA BIOFILTER = 14467.1 sf (0.332 ACI Impervious = 5255.6 sf (0.121 AC) Pervious = 9211.5 sf' (0.211 AC) UNDERDRAIN OUTFALL WITH 1'x1'x0.5' DEPTH OF 3" RIVER ROCK BIOFILTER LEVEL ONE PROFILE VIEW N.T.S. STORMWATER FACILITY LAYOUT PLAN SCALE: 111 = 20' Planting Schedule for Biofilter: (2) Amelanchier arborea - Downy Serviceberry (2) Betula Nigra - River Birch Groundcover Mixture: The top of the biofilter shall be seeded with the following mixture at a rate of 7 pounds live seed per acre. 25% Big Bluestem Andropogon gerardii 207o Virginia wild rye Elymus virginieus 207o Creeping bent grass Agrostis stolonifera 15% Switchgrass Panicum virgatum 107o Green Sedge Carex dipsacea 5% Black-eyed Susan Rudbeckia hirta 3% New England Aster Aster novae-angliae 2% New York Ironweed Vernonia noveboracensis Planting Depth and Spacing: 1. A tree denisty of approximately one tree per 250 square feet (i.e., 15 feet on -center). 2. Shrubs and herbaceous vegetation should generally be planted in clusters and at higher densities (10 feet on -center and 1 to 1.5 feet on -center, respectively). 3. Planting holes for trees need to be at least 4 feet deep. 4. Shrub holes should be 2-3 times the root ball width. There should be a solid soil pedestal beneath the root ball. Do not dig deeper than the root ball depth. 4. Woody vegetation should not be located at points of inflow; trees should not be planted directly above underdrains, but should be located closer to the perimeter. WoOLLEY ENGINEERING Consulting Civil Engineers 210 5th Street NE Charlottesville • Virginia 22902 (434) 973.0045 www.WooJley-Eng.com Owner: The Tandem School 279 Tandem Lane Charlottesville, Virginia 22902 P: (434) 296-1303 VSMP/WPO PLAN 0 Q 0 Z Uzi ��W J ry O Q i Z cL W W ��: m � C1. Q H �ILL 0 W z Z � <C STORM WATER MANAGEMENT PLAN Job Number: 19090 VDPPI BRIC T. 1r00LUT LIC. NO. 3708 �0 8-17-2020 $�Fi ti �ssIQNA�. ��G Date: December 30, 2019 Revision: February 27, 2020 April 17, 2020 June 24, 2020 July 28, 2020 August 17, 2020 Scale: As Noted Sheet No.: C6*10 8 of 14 copyright 0 2020 by Woolley Engineering WooLLEY ENGINEERING Consulting Civil Engineers 210 5th Street NE Charlottesville • Virginia 22902 Storm Profiles (434)973=0045 www.Woo.Uey-Eng.com Owner: The Tandem School 279 Tandem Lane Charlottesville, Virginia 22902 P: (434) 296-1303 00 00,6 LO LO LO LO VSMP/WPO 540 PLAN LO 0 in in LO LO Z w 11 00 5 Ilk �` LU iLU o� W mLR 06 � Q �� V-- 04 �o 510 W Z Length (ft) � 0 z u Sanitary Sewer Profile Sanitary Sewer Profile Storm Schedule UTILITY 17,77 F// U- PROFILES Job Number: 19090 THO.Fj'I V MC T. TOO( iJlJIS i LIC. NO. 3708 � �O� 8-17-2020 -�--• s-1(IVAL o a � Date: NApril 17, 2020 w L1J Revision: June 24, 2020 July 28, 2020 August 17, 2020 Note: All bends and Wyes in the list above and in the storm profiles are fittings that are to be Scale: sized to match the connecting pipes. As Noted510 Cn co rlNO Sheet No.: C6*1 Length (ft) Length (ft) 9 of 14 Pipe Fitting (typ.) 545 545 Pipe 4 - 4' of 6" M � ,� M �_, � oM.' � °� °+ 540 PVC @ 11.2b% � � � � N ,o � Co ^N � m� 540 N N N � N N N II II Pipe3-11'ofb" C5 a w u y"� all ,`�; a }'� ;° a moon m� PVC@5,43% w� w� � ..-- X�l''rr ..--' - _�`~ ---�'33' of b 535 Pipe 2 - 3' of b" P�Pe @ 4•b5�° 535 PVC @ 11.b5% •' P►pe 5 � 2b% 5 'r QVCi ® � 530 MM �� `� 530 .- 00 „Q� � 0 o c� c� o. o. CPS � II II II II Q Q O rr 3�0 �•'� �� II II M�7' 525 Q °@��a_ � m w v a QQ �-.�-� � �� 525 b r• � Pipe 7 - 3' of b" I� �+iP r- • PVC @ 3.23% r � ? rr®'•r 520 520 0 515 0 515 o C 00 v cn (O} N O O � � � N Slo '+}-- N° I I Q� °�° I I Q ° II ° 510 20+00 21+00 22+00 545 545 �o a; EXISTING GRADE (TYP.) � a a a a "� o�. �? M `� M � M o�.• ° cv, c7 M PROPOSED GRADE (TYP.) > M o`er+ a M Co � �u �u r-u �u �u �u w r-u Pipe 10-19'of8" +II a PVC@4.80% N � �N v '-N � NN N '-N N •-N � �-�� .aNw �I ro N N w oouu, Ilw wllw Wllw wllw Duw pllw o �11 �- a � m O %- � � %- � � w D w � � � � � � p � p O � .i` .1= Pipe 9 - 3' of $" o o --•�- pipe 17i=30' o 535 PVC @ 10.63% � � Pvc � 2•fl9% 535 � �, r b„ M Q`N`�N g 11 � @4 13'° m� � rrr"493�� @ ago + ciW� "PUG .'J G c�`r�� � P►pe11r53°tb.i�`o{6`e 530 R ___ � � �o � 530 O ..,- • . - . P1�e � 6/0 �•.. �OO[I� cMry• oo �� Qa d.0_ � II I _ ______.- 'o{S'tpV _ @576/--•`'SSo Q� �� Pipe12-2'ofb" �� �� �i NN �u•� 'o.o. gg Pipe 15-22'of "''�' Pipe 17-18'of � �lpe i3 gb ' ' .-'• o,o�o. � � ono: � � � o u PVC @ 15.65% ,Mn � u u "' �'' � ,� b" PVC @ 4.45% � � b" 'PVC v @ 2.05% �. � . • -_, �I II � M � r � �. 525 _••-• - II II �a�- ►I II II �. r-. II ^� II �� a� 525 -- • Q o Q. a� �a � � Pipe 13 - 12' of b" a� a� a� a.�� PVC@5.25% �� a_ a_ o � 520 0 520 o � � � o 515 � M �, 0 515 L L 30° v 3� o No II G � II � � cn � o. o a o <n c� � o� o� � N o� a� o L.0 a N -� Q II U } +- II : II � II 510 �° a° o a � o a� o Q o� 23+00 24+00 2s+oo 26+00 540 EXISTING COMMUNITY 540 HALL BUILDING PROPOSED GRADE (TY rr 535 rr' 535 r rr r' rr r 530 530 E (STING GRADE (TYP ®r i r ' '' 525 r r•° �G@12b�° 525 r ,Q rr i� rr rr f, r rr r . 520 -' Sea , 515 U �- 515 APPROX. ELEVATION � c L � .y o o � � O � CONTRACTOR TO FIELD VERIFY N � o a 3 a � c No �+ �+ �+�'+ �+ �+ �+ �+ `�"`± Scale: � O � O ° o � a� O o O o '- "- o � o '- o � O ~ r- Vert: 1" = 5' � y �� u o E II c u o m �, �� u a �-• a a a -t o u o � wc� II o Q o �� u a � �� u � c as n a _ Horiz: 1- 20 505 505 NN �---� �� �� 10+00 11+00 12+00 a� U . O 540 °' S40 PROPOSED GRADE m FFE = 537.31 535 rrr' r 535 r rr r r ✓rrrrr XISTING GRADE 530 530 G 525 3 525 520 520 515 � 0 515 o } N � U 510 � o ° 510 o � 3 � r Q Scale: Vert: 1" = 5' E II 505 ' a o 0 0 Horiz: 1:.-4: = 20' S05 13+00 14+00 15+00 Str. # Str. Type Rim Invert In Inv. Out Downstream Pipe 1 ES-1 519.Sfl - 519.00 b" Outfall 2 45° BEND - 529.90 529.9fl 109' - b" PVC 3 WYE - 530.10 53fl.1 fl 3' - 6" PVC 4 45° BEND - 530.70 53fl.7fl 11' - 6" PVC 5 WYE - 531.00 531.Ofl 4' - 6" PVC b WYE - 532.50 532.50 30' - b" PVC 7A 45° BEND - 534.00 534.00 33' - 6" PVC 7B 45° BEND - - 534.05 3' - 6" PVC 8 ES-1 524.67 - 524.Ofl 8" Outfall 9 1$"JUNCTION 536.90 529.00 529.00 $b' - 8" PVC - - 529.00 - From Str 15 10 WYE - 529.10 529.10 3' - 8" PVC 11 WYE - 530.00 530.00 19' - $" PVC 12 WYE - 532.2fl 532.2fl 53' - 6" PVC 13 45° BEND - 532.50 532.50 2' - b" PVC 14 45° BEND - - 533.00 12' - b" PVC 15 8" YD GRATE 53b.9b 533.50 533.50 4b' - b" PVC 1 b 8" YD GRATE 537.18 534.5fl 534.50 22' - b" PVC 17 8" YD GRATE 53b.95 535.10 535.10 30' - 6" PVC 18 8" YD GRATE 53b.95 - 535.45 18' - 6" PVC copyright 0 2020 by Woolley Engineering d SEWER SERVICE LATERAL QQNNECTIQN NOTES. LANDSCAPED UNDER * THOUROUGLY 1. WHERE A SEWER SERVICE LATERA-L, GONNEGTS TO A MANHOLE AND NO INVERT ELEVATION FOR THE SERVICE, LATERAL IS SQUARE TAPERED POLYPROPYLENE CATCH WoQLLEY ENGINEERING AREAS COMPACTED BY HARDSCAPE INDICATED 3 THE TOP (CR(7►l+IN)LEVATItN UF'` THE SIrRV1C BASIN (RISER) W/ U.V. Consulting Civil Engineers HAND OR APPROVED MECHANICAL TAMPER LATERAL PIPE $HALL, OE AT LEAST 4.2' HIGHER THAN THE TO.P (CROWN);; ELEVATION OF THE THE LOWEST PIPE CONNECTED INHIBITORS" SEE PLAN FOR GRATE WIDTH NE 210 Stle- Virginia Charlottesville •Virginia 22902 TO THE `MANHOLE, (434) 973 -0045 J www.Woolley-Eng.com BACKFILL SHALL COMPLY VDOT 21 A CRUSHED GRAVEL, 2. SEWER LATERALS TAPPED INTO AN EXISTING ' SEWER MAIN SHALL SLOPE SLOPE WITH LANDSCAPE PLAN COMPACTED TO 95% BE. CONNECTED FUSING A WIPE' SADOLt,: & SPECIFICATIONS MAXIMUM DENSITY t' 13, MIN Ihr1UI�1 GRADE FOR SEWER SERVICE. CONNECTION SHALL. BE 2� ' �'..s •r..�••---�/: i �, �-Owner: % '-.✓ � - .�.--' `r� � "�`� TheTandernSchaol CLASS I BACKFILL IN I ACCORDANCE WITH 121, INITIAL BACKFILL * (1/4" PER FOOTJ2 : '""'�--- --'---' �.�� .-- �„r-� ` '� � �'" "' -- �� "' �s.�.- ��--� `` CONTRACTOR SHALL " �`", -� � �� � � 279 Tandem Lane Charlottesville Virginia "a g'� SECTION 302 OF THE VDOT ROAD &BRIDGE D +12" MIN (6 LIFTS) SPRING LINE OF PIPE 4. ALL SEWER LATERALS SHALL HAVE A MINIMUM COVER 2' MIN r� `��, �.-��� ,_ �, ,. 'w'i� -"'-'` �' f�-"" ''.-� -�� COMPACT EACH LAYER �'��� � � �i �''� 1 �� ---' 1 y''�'� 1 --" OF BACKFILL PRIOR TO ����,' �ga2 (434) 2 P 96-1303 SPECIFICATIONS HAUNCHING��.� DIAMIETER OF 4". 5, ALL SEWER LATERALS SHALL HAVE A MINIMUM COVER 7 -o, ` 'ow �-- ��✓,, � INSTALLING EACH =�t�� EXTENSION RISER l NOTES: 1. WHERE ROCK IS ENCOUNTERED ;; ,_ vT`� 2 =� �'�° "�` STONE BEDDING OF 3 FEET„ P ��,�� �O i �:� ,1 �,' ,'� . // °O J <�� ;:-: Yw-r PIPE SHALL BE INSTALLED ON A ��.�. y ": DUST „ (4 MIN.- 6 MAX.) �L %1�r�f / \ / /� ,/ rr ✓f'' �,,% /,,,/ f,r �''`.,/ 0����� / / O� SQUARE TAPERED /j'' %/ /� f,%r//' ,,/ `��°\� / ``e, / POLYPROPYLENE VSMPf WPO MINIMUM 6" BEDDING OF CRUSHED STONE, FOUNDATION (SHALL BE TREATED ;,'`� j'`•�'`1X 1\1 // % ,, /�`,�`,/°�'/� ,/` CATCH BASIN W/ U.V. f �LA1 2, FOR COMPACTION OVER PIPE REQUIRED WHEN SOIL CONDITIONS ARE UNSTABLE,) 'X FINISHED GROI.IND / K<�,�, /���� INHIBITORS. � YTRENCH USE APPROVED HAND OPERATED MECHANICAL MARKERr�j��'���w ��11 �``,�/ �� /��'` �� ���/ ��Z/�/ �� �f TAMPER. ji�°�/-°��`j�',�./m /��f� . �O� O�% �° �1\�/ `0\N 7 GRAVEL BASE I Al X�,/�/`,/,/� 4VDOT ' DEPTH Xo STORM DRAINAGE PIPE BEDDING & BACKFILL %, PLUG END OF MAINLINE 8ERVI'CE LATERAL %���' l/`�/,>``�,/� %/e//, � �i'/ \ SUBBASECOMPASOIL j e'i'��r/��'i ,�,,�/°.,� � Z III--III------III----•-III--III III--III-I I ' III--.�-III---1 I I- �,,,� � - L-I-I 1 I------11 I I --I 11=1 11 �,, Q> THREADED PLUG BRASS CAP CLEANOUT ADAPTOR i ItlI NOTE: CONTRACTOR SHALL INSTALL J (1 (� (( g' WEEP HOLE �-..II W t n � FINISHED GRADE BASIN PER MANUFACTURER'S IN EACH ADJUSTABLE VALVE BOX SPECIFICATIONS. CORNER IN LIFE V`-TESLU LU VDOT NO.21 A STONE 3" �� PLAN 6,7 " VARIES YARD DRAINS N.T.S. `G•• u� LL O - 4 PVC PIPE REDUCER(IFNECESSARY) SEWER SERVICE LATERAL. CONNECTION'' I- II'' ,, L� Z D a WYE'Y"TEE t N.T.S. FIQ, S- 2 O TFt-A 1 2 3 9 I 5 7 8 r{ NOTES: C7 '+ 1, SUB -BASE DEPTH AND PREPARATION IS DEPENDENT ON SITE CONDITIONS PLUS LOADING REQUIREMENTS. 2. TYPICAL SEEDING OR HYDROSEEDING METHODS FOR GRASS GROWTH ARE ACCEPTABLE WITH TRUEGRID. i�IT STORM DRAINAGE CLEAN -OUT DETAIL (TYP.) A 3. SOD CAN BE LAID ON SOIL FILLED GRID FOR IMMEDIATE GRASS (TYPICAL FAIR FIRE LANES) A aPPRoxIATE N.T.S. 4. FOR HIGHER TRAFFIC INSTALLATIONS, RECESS SOIL LEVEL WITHIN TRUEGRID AND SEED OR PRESS IN SOD SO THAT TOP OF GRID IS AT SOIL LEVEL. WMN Ei.ECTFi1C � G PPMY �� OM COMPANY 5�.3 J GENERAL 5. GEOGRID MESH CAR GEOFABRIC MAY BE REQUIRED BETWEEN SUBGRADE & SUBBASE EASEMENT OB 811 c FFE PC 60 DETAILS FOR CERTAIN SOILS AND SITE SPECIFIC REQUIREMENTS. EXISTING 6. FILTER FABRIC MAY BE REQUIRED BETWEEN TRUEGRID AND SUB -LASE MATERNAL IF HIGH VOID RATIO? IN SUB -BASE MATERIAL. (EXAMPLE: UNIFORMLY GRADED ANGULAR STONE / #57 OR SIMILAR). COMMUNITY HALL 8�-537.37` BUILDING EFE540.2 � 7. TRUEGRID PRO LITER PRODUCTS ARE SUFFICIENTLY RATED FOR LOW TRAFFIC H-20JHS 20 LOADING. C m Job Number: S. NO STAKING TYPICALLY NECESSARY WITH TRUEGRID PRO LITE WHEN SLOPE 20 DEGREES, ASSESS PROJECT AS NEEDED. FEE=537,31' 19090 9. TRUEGRID PRO LITE IS ADA COMPLIANT WITH PROPER FILL MATERIAL. TgUgGRID BLQ!gK`REFERENCE, VIEW 7�,d 1O7. FINAL ENGINEERED CROSS SECTION AGGREGATES AND DEPTH SHOULD ALLOW FOUR EXPECTED INFILTRATION RATES, PREASSEMBLED & DELIVERED B STORAGE CAPACITIES, OUTLET FLOW RATES, AND OTHER SITE SPECIFIC CONDITIONS AND LOAD REQUIREMENTS. 11. THIS CROSS SECTION IS FOR INFORMATION ONLY. IN 4' X 4' SHEET. RECONFIGURED AS NEEDED. NO EXTRA TOOLING OR ACCESSORIES REQUIREDs B �� y1 5" CONCRETE 3000 PSI HIGH AIR ENTRAINMENT WIDTH VARIES, SEE PLAN FFOR WWF 6X6 - W2,9 X W2.9 LIGHT BROOM -,~-GRASS ;I� SaIL RECESSED TRUEGRID PERMEABLE { 11t3"-1(4i' FROM I PAVING SYSTEM (SEED OR SOD) 3/4" OR V GLEAN WASHED DETENTION CONSIDERATIONS, TOP OF GRID �: ANGULAR STONE ADJOINING FINISH GRADE TRUEGRID SURFACE FLUSH i1R SLICaHTLY RECESSED SEE DRAWING; TG-EDGE-OPTS FOR EDGING OPTIONS PROPos^EwuoµaooR � =0 T. WOOLLKY � LiC. NO. 3708 � +� W o� 8-17-2020 FINISH xte s. I i I II 3 _ .3t FFE ��4> GRADE I "I�i ,1E i 1111. I� I �I IFINISH 1.t1" 1 r 2 S 2 2 5Et�'StS2S5 z � f %4 .1 SLOPE --- -•--- 4 • •- •' y . ., •' • •. a _ ... w '__.�...-. > ;: ' .,. ,. ' � ,: _ • SAND/GRAVEL a�sE MIX COMMfJN - , � -. Date: _ _ I -1 II 6 j - -- -_ _ 1-_ �-,' r' _-_ 11- I- III I I 1 i r I C - - Gs FII_t_ A�PLtcATIaNs _ _ ��WITH ►� 6.iD MIN - ,. ` .� .. -. ��. -!. .. �..7-''. ,.� �., ..��-rC r-� _ .. .�.. _ ~ 40% VOID SPACE FQIK DETIF t_ r} NTION IN CLEAN UNIFORM ANGULAR BASE STONE C : - }. ! f � .� ., / - { _ f i C LIMITS OF GRASS December 30 201 .. , Yl Revision: S O I7 „ COMPACTED AGGR AGGREGATEEXPANSION 6 1. 3/8 . _� _: _ .. -_ - PAVERS Feb February 27, 2020 BASE - VDOT #21 A INTO MAX 6 O.G. B 2 SAW CUT CONTROL JOINTS, _ __ -�, •- ,. ._. -._ ,-_ __ .._ _. __ ..... .... ....... -1- a... I I. I I I.t._l h_Iil.. f�'-k.r fii_E.�fir <r .. j-+ iIn_! I_r i_-, I �, f 1 i sill,``( "t r I April 17 2020 MAX O.C. EXPANSION JOINTS 30 COMPACTED SUBGRA COMPA EFTS CURB WIDTH 3 WHERE SIDEWALK M U _ _._ .._J _ _ _ .__. 1 �>._., _- ., _t __ _ __ _r _(tl�f _.fll�.. I_i.�l :I _ ,-_ , rr- ri:�li .I,,._.9,h _.., _1 . m .. ;..._ d,... , _t ., .�:If :I , ,, _i _I:. ,,._.,NI _ilr,. st ..r1__fl.. 11,.,_,I�l{ id. .tl li, - .7_..ls__,,,{ t. 1 li _ iC:__.1I Il,_ 11I ,I._..l"k r�C 1 1 _ __ - - _ § - } � ,- _ r _ - - __ I t! k i.�71i 11s�I1 , l -€_ i �, -:, �( .,-. / 3 __ i �II tl_ _ _ LL _ L i . tl-ri � i_ . ."1 �i I � �, ( f _ li.... 1_..1.9_.1%1. � .1� I r I I_ (I � _ �..... - -- _ - 7 ,r_. ,_ _ , I �_ I:�,...,.. I, ---Ie _,af�'I- f,. ,! {I # � #. 1�". 1 � . � _ _ z- --1 ,�' �- L ,r ..r 11�-- , -�-� -..�_ �_ __ -_ -��,.. _ � .._ � , I . ,- .� , ., _ , ,-, , �. _ I _ _ - v � _..�: . _. r I✓ I , L, t _• _- _ ._ ,_. _ _ _ _... i � _..__ I, _.:li .k _...... ! W :- l _ _ _ , ! ! - 3. _ .__ kz . t._ ._ fir- ..._. ._7TE kl.. i __Tr ,-C{... 9 Imo. 1� $ '-1 I i .. ! ,T , ,- ! -at `�`-• 4 ui-) , .iT .�!" ,4r i k:-•, d. I_.. 1,� . __ .... l . ik i, T � I , . , Tt�lf i .� I_. • _.. .. ._ ._. , , . , , � .,._ll`� ,.klr. �il-il .., �., I "i ._ .,_ _I_, ,.i ...`_`�.,.I � F ,r � s 1 _ s 1 ire€ . . 3_I!i lfl 11 ii.- V_ fir_I I .3 , i i E /� _ _ .... _ _.. .-., . E, � _ , , .f Cfr•-{1r_^ i. Ikl i , 61 fi( J .,. . - . -,_ _ _ , _, f Ili, -r _ _ , _ ,_. __ .� _ II f I tt>~-11 IE _ _ � 193_,Il�-i L ,, _ �, _ n- r _I, i!7 ! _ _.�. I 3I1 1i r E i �- , -f � r-s � Lkl T_.,f. � ... , .- . , , . t _ . , . ,.., ,r. t ,,. ,, ,:., _,,,. , , , , , , .,:-:;. _ .. ., .,.,.�.. r . ,,. . „ , , .., _ _:. _ .: _. _ .. , June 24 2020 July 28,2020 J Y CBR_ i_._ 0NOTED. SHALL BE 6 UNL ESS 4. SCORING PATTERN SHALL MATCH EXISTING. _ _ _ _ T ,>- i _ _ _ _ � , .. a--, r-- _ _ � -- , _ I � r--7 , , �. _ _ _ , I ., , I _ _ (l. Tl-- ._ il_ 31. i _.I, , ,rr"l3l---ri F- � *1 r r 1 i s T �f ik. I ... �I. u.. x.. p ii f 1 •� _-S Y i _ _ r .,-.. �. _ , . _ i-- �-, �• T � �j p, �rr� --��' 1r>r II'` �1 P f- ^RED T REI'A _ _��_f . z-_,_�,._�_ � 7-r..a>.._a.i__..r:.�-� ..,L'k,.S..1.lU._3�I,.---Y"� !-�. . , ,.t .i �- .�1„_.(i s �( [i�l i ii�i: .:�I, f,,. a I lk $.. G _ r ,r r i I, iil Y I I I RiD MESH ii I1 i6. sl. I I i E l� _ , i G Q S 1 _. I _il ITT_ i _ j'" y�ry}�,{ ,^ - -- r� IT .. : .:. :... r f ,• .. .-., . _ra_.�cr _ .. ._ _ �.. E I3RI •. �....4 T�_, a..� _� ..�, �_.: �-�- �€ , r , R �a 4FA C --a� C�-,_1,•. .. i ._.._... _ , . _. .. ,. ,. . , . ,,:.,. ,. , , _ , ,_. ,, _ ,, ... , . , , s ... :. . :. ,.,... ,., _. ._... ... .. ... .. .. .. I, ... r ... . ...... , .. ... .... Y _.. ,......,. , ._.:...-.,.,.. .,..,. ,. .... :.,....., ..,.....: ,, ly r ;, ,. ,, ! • f �r :. rt ,. r . , _ , _ , .. ... _. _ ., August 1 2020 7 f ________-_ SUBGRADE � , • ,_ r_W � � OPTION LOOrATIQN.. , „ -;;' . :- i1 _fik Ii--Rill 11.. Wrs // s:_f€I. ki_ kk lii 4 IN STOCK. FACTORY QIREGL R ORDERING*. GALL 9 8a5 355 GRID 47 3 S Q i� Rf�l�[R8'(a � �i ( } _ ,.. >: 5. CONTRACTOR SHALL MATCH THE COLOR ,ik.1 lit , r _ ._. _ ....._ a... ,. _..,_..._ _._. ,_._ ._.. ,_.. . I rI SEE N T6 # 5 O F THE EXISTING SIDEWALK. .rrr _ __ .._ _ ,_ _.- , _ __..,,.• . _. _.�, , i E i _ __ _ .._ ..: _ r _ . �I 1t i 1 _Il , If i- 11, t �, _.I - - , __ _ _ ._ , . 7 ., . I : I i � , 1 -,I N.x _l L. 1._ .._.1 • ..L .__ >. _ . w . I, _ �t J� .. , i i _ :. e. ;:, 7. ,.;'::. .. ,.r.• to ,.: ,... <..I .,,,.... SIDEWALKDETAIL _ ,. ,{. _ .,_ __ ,- ._r_ . ,_Ilr;. _,_ _ , .I ^-- -,_ _... __. _. __, ._ ,__. .-.., r I. € tt „r ) �r .Y,l �i�,1�..-.I' ,1 I�1_L..LL.�11�...I,.l�J1��,_ itL.>I,.i�,I,.��i,�- -t_...__.....,_�.�r��.t��..�t-i:_�Ir.�lr..4��wfc�-�r.#�,I�.��� rl�,�..>._..5.tw��r��.�„__.��.�_�_,.L_�r.�..tl.,..__.��Ic.��1_t.,.�..rl.�l���.� ,� .� � L. i..� ...i_,,�_i..�11.�,I_,.._E1 w.1��I..,_.�t.:.,:...- , Scale. N.T.S. _... _ . _._ _ _. -, _ . _ __ ... _____... ___- ... ____ _._ 1-555 355 RID 4743 GRASS FILL - HEAVY LQAD G ( ) CLIENT/PROJECT As Noted APPI_tGATI N EXAMPLES: O 1 rai1E55orr+"anYnS£MCIFfr7 _ _ ..... _ _ _ ,., ... I � IN p` v134014SAF,EINIK11E3 APRf"Q1G1C I � -_._._. , _ K1 Sheet No.. RV DRIVEWAYS DRIVEWAYS IIBM_ �/ �+ axoFw�s:?aa.v r.�s+a:a Tirr;;uTsre�rcE � iNFpfltAf€TICNi' + - iid50E�G7/5Prt3CR Gt1{.tEp ESY AI,pq T fo* Projec}irym blM 1 i T11FEACIum. FRGPEarYgFlft" To, ......: ..,,.... ..._._ _, ._..._ .,,,.,.......r ,>_w._.... »,,. ..._... _„W,.._._..,,..... ¢�"B� '"� �• OVERFLOW PARKING IT"01U TMT tic TRUEGi11C1PRQLI7E � MQRQTK?�F T a.rr f I �er<my GRASS FILL t14 � Q�GINAI ISSUE } JT JT Cw 9122019 3 REPaaRQA(N9E EFJ 144N xEOF V? eu�a�- ! HEAVY LQAD r L?R:1IM GI'ECnE4 PR37/ED L'+tirE '- '` C.'deit;Ee 9l3t37r9 ' ,.. REV { ;- . 0 TC I TE 0RS Hl l 44 _ _.. __..__... _ ..._.,.. . ...._., .. .,_ - . __.. - , . _.. _ . __...__. ,_ _....__� r�ruE I ..._, .. i ��'�" __._.. ---. _ _.__. _ _.___... _ _ ...__ _ _ TRUEGRIDPAVE�R,Icom d ra2.A'�r. _ ._._ .. YAL i2 � I SHfEi lOil Z T ,.C7*0 _,. _ __. ... .......... ... - - ­-­ -- -- I 7 f "= SCALE: I 20' GRASS ' PAVER DETAIL > 10 of 14 N.T.S. copyright a 2020 by Woolley Engineering EROSION AND SEDIMENT CONTROL NARRATIVE Tandem Friends School Erosion and Sediment Control Plan The County of Albemarle, Virginia PROJECT DESCRIPTION The purpose of this E&S narrative and plan is for the purpose of adding a new outdoor pavillion building to the subject property. A total of approximately 0.91 acres will be disturbed during construction. EXISTING SITE CONDITIONS The topographic and built improvements existing on the subject property are depicted on the accompanying E&S plan, utility plan & profiles, and the general notes sheet. ADJACENT AREAS The Tandem Friends School is located just outside of the City of Charlottesville in Albemarle County, Virginia. The lot on which the school is located is approximately 24.508 acres. To the north of the subject property is Monticello High School. To the south and east of the subject property are residences and farm land. To the west of the property is Monticello Fire and Rescue. OFF -SITE AREAS All land disturbing activities shall occur on -site and within the limits of project shown on the plans. At this point, no off -site borrow, waste or grading activity will occur. This development also includes the construction of a proposed new extension/connection of the existing trail network. Significant land disturbance is not anticipated with the new trail work, if necessary the contractor shall apply erosion control measures as directed by the erosion & sediment control inspector. SOILS This site is located in a geologic area referred to as the Piedmont Physiographic Province. The soils in this geologic area are weathered from the underlying metamorphic bedrock. The naturally occurring soils at this site were found to be moderately to highly plastic silts weathered from the Catoctin formation which consists of basic ' lava flows, schist, and gneiss composed of chlorite, plagioclase, amphlobole and e pidote. The soils observed here appear to be weathered from metamorphosed sedimentary soils such as phyllite and schist. The map units on the detailed soil map depicted on the Erosion and Sediment Control Plan, represent the soils in hsuitability n d o determine the with h soil maps, can be use t in the survey area. The map unit descriptions, along t t e p , and potential of a soil for specific uses, and, precautionary erosion and sedimentation control measures which must be adhered to. They also can be used to plan for the management needed for those uses. The profile of the soil classifications follows: Pits, quarry (69): This unit consists of areas that have been excavated for rock used in road building or construction. Rabun Clay (7113), 2 to 7 percent slopes: This deep, gently sloping, well drained permable soil found on gently sloping to steep ridges and mountain slopes. Typically, the surface layer is dark reddish brown clay loam e subsoil is dark re d clay and about forty-eight 48 inches thick. The substratum to about six (6) inches thick. The y( ) a depth of about seventy-nine (79) inches is brown to yellowish -red silt clay loam. The depth to the restrictive feature is greater than eighty (80) inches. Surface runoff is medium and the water capacity is moderately high to high. Rabun Clay (72C3), 7 to 15 percent slopes: This deep, moderately sloping, well drained permable soil found on gently sloping to steep ridges and mountain slopes. Typically, the surface layer is dark reddish brown clay inches about four (4) inches thick. The subsoil is dark red clay and about forty-eight (48) thick k. c The substratum to a depth of about seventy-nine (79) inches is brown to yellowish -red silt clay loam. The depth to the restrictive feature is greater than eighty (80) inches. Surface runoff is medium and the water capacity is moderately high to high. Rabun Clay (72D3), 15 to 25 percent slopes: This deep, moderately sloping, well drained permable soil found on gently sloping to steep ridges and mountain slopes. Typically, the surface layer is dark reddish brown clay about four (4) inches thick. The subsoil is dark red clay and about forty-eight (48) inches thick The substratum to a depth of about seventy-nine (79) inches is brown to yellowish -red silt clay loam. The depth to the restrictive feature is greater than eighty (80) inches. Surface runoff is high and the water capacity is moderately high to high. The risk of erosion is severe. CRITICAL AREAS There are managed steep slopes on the subject property. These managed slopes are out of the scope of the addition of the outdoor pavillion building. EROSION AND SEDIMENT CONTROL MEASURES The contractor shall provide, construct and maintain erosion and sediment control measures on the site, in accordance with the Virginia Department of Transportation and the County of Albemarle erosion and sediment control measures (refer to the Erosion and Sediment Control Plan sheet). All vegetative and structural erosion and sediment control practices shall be constructed and maintained according to minimum standards and specifications of the Virginia Erosion and Sediment Control Handbook. Permanent or temporary soil stabilization shall be applied to denuded areas within seven (7) days after final grade is reached on any portion of the site. Temporary soil stabilization shall be applied within seven (7) days to denuded areas that may not be at final grade but will remain dormant (undisturbed) for longer than 30 days. Permanent stabilization shall be applied to areas that are to be left dormant for more than one year. Soil stabilization refers to measures that protect soil from the erosive farces of raindrop impact and flowing water. Applicable practices include vegetative establishment, mulching, and the early application of gravel base on areas to be stone. Soil stabilization measures should be selected to be appropriate for the time of the year, site conditions, and estimated duration of use. Temporary sediment filters and traps, perimeter dikes, sediment barriers and other measures intended to retain sediment shall be constructed as a first step in any land -disturbing activity and be made functional before up slope land disturbance takes place. Stabilization measures shall be applied to earthen structures such as dams, dikes and diversions immediately after installation. The following structural practices will be implemented according to the requirements set forth by the Virginia Erosion and Sediment Control. Safety Fence (3.01) A protective barrier consisting of polyethylene web secured to a conventional metal post driven into the ground a minimum of 18 inches. Posts should be spaced at 6-foot centers. Used to prevent undesirable use of an erosion control measure by the public. To prevent access to an erosion control measure. Specific Application: Safety fence will be used at areas where existing Tandem Friends School employees and visitors may come into contact with the planned work area. Contractor may substitute temporary chain -link fencing where deemed appropriate. Contractor shall coordinate with project manager regarding substitutions. bb. Temporary Stone Construction Entrance (3.02) A seventy (70) foot stone section shall be installed at the point of vehicular ingress and egress on the construction site. This stone area shall be used for washing sediment from vehicles exiting the site. Where sediment is transported onto a public road surface, the road shall be cleaned thoroughly at the end of each day. Sediment shall be removed from the roads by shoveling or sweeping and transported to a sediment control disposal area. Street washing shall be allowed only after sediment is removed in this manner. This provision shall apply to individual subdivision lots as well as larger land disturbing activities. Specific Application: A construction entrance shall be placed adjacent to Tandem Lane at the existing gravel driveway and additional gravel shall be applied if the Erosion Control inspector deems it necessary. if deemed necessary by The County Inspector the temporary stone construction entrance shall be converted into a temporary paved construction entrance. cam. Silt Fence (3.05) A temporary sediment barrier consisting of synthetic filter fabric stretched across and attached to supporting posts and entrenched. Used to prevent sediment from leaving the site. To decrease the velocity of sheet flows. Specific Application: Silt fence will be used at the foot of the cut l fill slopes and as shown on the plan. Inlet Protection (3.07) A temporary sediment filter around a storm inlet or curb inlet, in order to prevent sediment from entering storm drainage systems prior to permanent stabilization of the disturbed area. Specific Application: Inlet protection will be used around all storm drainage inlets and curb inlets existing within the project area and as shown on the plan. Outlet Protection (3.18) Structurally lined aprons or other acceptable energy dissipating devices placed at the outlets of pipes or paved channel sections. To prevent scour at stormwater outlets and minimize downstream erosion. Specific Application: This form of protection shall be utilized on all stormwater outlets by using riprap. fL Surface Roughening (3.29) This erosion and sedimentation control measure involves creating horizontal depressions on slopes or leaving slopes in a roughened condition by not fine -grading them. This is done to aid in the establishment of vegetative cover or seed, to reduce runoff velocity and increase infiltration, and to reduce erosion and provide for sediment trapping. Specific Application: This form of protection shall be performed on all slopes 3:1 or greater as shown on the accompanying E&S Plan. Slopes less steep than 3:1 should have the soil lightly roughened and loose to a depth of 2-4 "prior to seeding. gJ Temporary Seeding (3.31) The establishment of a temporary vegetative cover on disturbed areas by seeding with appropriate rapidly growing annual plants. This protects slopes exposed during construction until permanent vegetative cover can be established. Temporary seeding will apply to all areas on the site that will not be brought to final grade for periods of thirty (30) days to one year. Selection of the appropriate seed mixture depends upon the time of year it is to be applied (See schedule on E&S details sheet.) Specific Application: Temporary seeding shall be applied to all denuded areas prior to permanent stabilization in the form of either hardscape or permanent seeding. Permanent Seeding (3.32) Establishment of perennial vegetative cover by planting seed on rough -graded areas that will not be brought to final grade for a year or more or where permanent, long-lived vegetative cover is needed on fine -graded areas. Specific Application: Permanent seeding will be applied to all portions of disturbed area. D. Soil Stabilization Blankets &Matting (3.36) Stabilizing disturbed areas of a steep slope, channel, or a shoreline by applying protective covering on a prepared area. The matting will protect the young vegetation and promote its establishment while Increasing the permissible velocity of turf grass stands. Specific Application: Soil Stabilization blankets & matting will be utilized as shown on the plan. D. Tree Preservation and Protection (3.38) Protection of desirable trees from mechanical and other injury during land disturbing and construction activity. Specific Application: Tree protection shall be applied to select vegetation on the site as illustrated on the plan. Dust Control (3.39) Reducing surface air movement of dust during land disturbances, demolition or construction activities in areas subject to dust problems in order to prevent soil loss and reduce the presence of potentially harmful airborne substance. Specific Application: Dust control shall be applied as necessary. 61 6" BLANKET MATTING TYPICAL TREATMENT - 1 (SOIL STABILIZATION BLANKET) INSTALLATION CRITERIA PERMANENT STABILIZATION All areas disturbed by construction will be stabilized with permanent seeding immediately following finish grading. All seeds will be approved by the "Virginia Crop Improvement Association,"Blacksburg Virginia. Seeding will be done with the following. Two (2) parts Kentucky Bluegrass (Poa pratensis), by weight; minimum 98 % purity and 90% germination; maximum 1 % weed seed Three (3) parts perennial Ryegrass (Lablum perrene) by weight; minimum 85 % purity and 90% germination, maximum 1 % weed seed. Fifteen (15) parts Falcon Fescue; minimum 98 % purity and 90% germination; maximum 1 % weed seed. Permanently seeded areas shall be protected during establishment. Mulch shall consist of oat or wheat straw, free from weeds, foreign matter detrimental to plant life, and dry. Hay or chopped cornstalks will not be permitted. Mulch and/or lime shall be applied at a rate of two (2) tons per acre. Specifications for fertilizer are FS 0-F-241 C, Type 1, solid form; Grade A or B; recommended for grass, with one hundred (100) percent of the elements derived from organic sources of the following properties: a) Nitrogen 12.0% b) Phosphoric Acid 8.0% c) Soluble Potash 8.0% With at least fifty (50) percent of the nitrogen from a non -water soluble organic source. The following measures shall be incorporated during fertilization: APPY fe rtilizer at a rate of 1000 lbs.lacre. Apply Apply after smooth raking of topsoil. Do not apply fertilizer at same time or with same machine as will be used to apply seed. Till fertilizer into upper two (2) inches of topsoil. Lightly water dry topsoil to depth of six (6) inches at least forty-eight (48) hours prior to seeding to obtain a loose friable seed bed and to aid in the dissipation of fertilizer. The following rates and practices will be adhered to for all seeding that occurs on -site: Apply seed a rate of 6-lbsJ1000 sq. ft. evenly at right angles with a spreader or seeding machine. Rake in lightly, covering seed to depth of 118 inch. Do not seed area in excess of that which can be mulched on same day. Do not sow immediately following rain, when ground is too dry, or during windy periods. t roller exceeding Roll seeded area with roil not g 112 lbs. Immediately following seeding and compacting apply mulch to a thickness of one (1) inch. Maintain clear of shrubs and trees. Apply water with a fine spray immediately after each area has been mulched. Saturate to six (6) inches of soil. MAINTENANCE All erosion and sediment control measures must be maintained and repaired immediately to insure continued performance of their intended functions as stated in the Virginia Erosion & Sediment Control Handbook, Third Edition 1992. In general, all erosion and sediment control measures will be checked weekly and after each runoff -producing rainfall event. All seeded and sodded areas will be checked regularly to ensure that a good stand is maintained. Areas will be fertilized, reseeded and resodded as needed. DISPOSITION OF TEMPORARY MEASURES All temporary erosion and sediment control measures, including the temporary sediment basins, shall be removed within 30 days after final site stabilization is achieved or after the temporary measures are no longer needed, unless otherwise authorized by the local program administrator. Trapped sediment and other disturbed soil areas resulting from the disposition of temporary measures shall be permanently stabilized to prevent further erosion and sedimentation. STORMWATER MANAGEMENT Pre -construction the Tandem Friends School site primarily drains via surface runoff. New proposed impervious shall be treated by a biofilter. The biofilter will have a level spreader to convert remaining runoff to sheet flow. A gravel access drive will expand an existing driveway for the first portion of the drive and then grass pavers will complete the access drive. Stormwater flowing across the gravel portion of the access drive will flow through a gravel diaphragm in order to be converted to sheet flow. All proposed runoff from the site will convert to sheet flow to meet VSMP regulations under Part 11 B, Water Quantity (9VAC25-870-66 D.) NOTES ANCHOR SLOT APPROXIMATELY 200 STAPLES REQUIRED PER 100 SQ. YDS. OF MATERIAL ROLL. ANCHOR SLOTS, JUNCTION SLOTS & CHECK SLOTS TO BE BURIED 6" TO 12". 12" MAX. 4:1 OR FLATTER JUNCTION SLOT 6" MAX. STEEPER THAN 4:1 EDGE AND END JOINTS I I I I I I I I I I CHECK SLOT " TO BE SNUGLY ABUTTED TERMINAL FOLD (JUTE MESH WILL HAVE I I I STAPLED LAP JOINT IN LIEU OF EDGE JOINT) I I I I I LAP JOINT 2" MIN. (JUTE MESH ONLY) STAPLE FORMED FROM NO. 11 STEEL WIRE. 8" STAPLE MIN. LENGTH FOR SANDY SOIL. 6" STAPLE MIN. LENGTH FOR OTHER SOIL. I I I I III I I 5' MAX. 4:1 OR FLATTER I I I I 3' MAX. STEEPER THAN 4:1 I I I I I I I I I I I I I I II I II I II I I * CHECK SLOT 7I I I I I VAR. I VAR. PLAN VIEW STAPLING DIAGRAM * CHECK SLOTS AT MIN. 50' C-C INTERVALS; NOT REQ.'D WITH ALL "COMBINATION" BLANKETS 2" 2" TAMP FIRMLY ANCHOR SLOT 6" TO 12" TAMP FIRMLY CHECK SLOT ..a — 6" TO 12" JUNCTION SLOT � TAMP FIRMLY —12" MIN-.-4 6" TO 12" TERMINAL FOLD TAMP FIRMLY I-- 4" MIN.—) EROSION AND SEDIMENT CONTROL NOTES Tandem Friends School Minor Site Plan Amendment: Erosion 8, Sediment Control Plan The County of Albemarle, Virginia ES-1 The Albemarle County Department of Community Development must be notified one week prior to the pre - construction conference, one week prior to the commencement of land disturbing activity, and one week prior to the final inspection. ES-2 All erosion and sediment control measures will be constructed and maintained according to minimum standards and specifications of the Virginia Erosion and Sediment Control Handbook and Virginia Regulations VR625-02-00 Erosion and Sediment Control Regulations. ES-3 All erosion and sediment control measures are to be placed prior to or as the first step in clearing. ES-4 4. A copy of the approved erosion and sediment control plan shall be maintained on the site at all times. ES-5 Prior to commencing land disturbing activities in areas other than indicated on these plans (including, but not limited to, off -site borrow or waste areas), the contractor shall submit a supplementary erosion control plan to the owner for review and approval by the plan approving authority. ES-6 The contractor is responsible for installation of any additional erosion control measures necessary to prevent erosion and sedimentation as determined by the plan approving authority. 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. ES-9 The contractor shall inspect all erosion control measures periodically and after each runoff producing rainfall event. Any necessary repairs or cleanup to maintain the effectiveness of the erosion control devices shall be made immediately. ES-10 All fill material to be taken from an approved, designated borrow area. ES-11 Al waste materials shall be taken to an approved waste area. Earth fill shall be inert materials only, free of roots, stumps, wood, rubbish, and other debris. ES-12 Borrow or waste areas are to be reclaimed within 7 days of completion per Zoning Ordinance section 5.1.28. ES-13 All inert materials shall be transported in compliance with section 13-301 of the Code of Albemarle. ES-14 Borrow, fill or waste activity involving industrial -type power equipment shall be limited to the hours of 7:00am to 9:00pm. ES-15 Borrow, fill or waste activity shall be conducted in a safe manner than 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 o slides, sinking, or collapse. ES-16 The developer shall reserve the right to install, maintain, remove or convert to permanent stormwater management facilities where applicable all erosion control measures required by this plan regardless of the sale of any lot, unit, building or other portion of the property. be ter seeding mulching. Seeding i t be t 7 Ib cre n in the E -18 Temporary stabilization shall arm s d and mu d s a a 5 s/a and S P ry temporary g 9 9 , months of September to February to consist a 50/50 mix of Annual Ryegrass and Cereal Winter Rye, or in March and April to consist of Annual Rye, or May through August to consist of German Millet. Straw mulch is hr gh A g to be applied at 80lbs/100sf. Alternatives are subject to approved by the County erosion control inspector. ES-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 a 000 bs acre and consist of a 10-20 10 nutrient mix. Permanent seeding shall be applied at PP t 1 I / g RP 180lbs/acre and consist of 95% Kentucky 31 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. ES-19 Maintenance: All measures are to be inspected weekly and after each rainfall. Any damage or clogging to structural measures is to be repair immediately. Silt traps are to be cleaned when 60% of the wet storage t sediment. All seeded areas are to be reseeded when necessary to achieve a good stand volume is filled with ry of grass. Silt fence and diversion dykes which are collecting sediment to half their height must be cleaned and repaired immediately. ES-20 All temporary erosion and sediment control measures are to be removed within 30 days of final site stabilization, when measures are no longer needed, subject to approval by the County erosion control inspector. SOIL MAP KEY 69 71B 72C3 72D3 V�� 72C3 WbouLEY ENGINEERING Consulting Civil Engineers 210 5th Street NE Charlottesville • Virginia 22902 (434) 973.0045 w-ww.Woolley-Eng.com A2 The Tandem School 279 Tandem Lane Charlottesville, Virginia 22902 P: (434) 296-1303 VSMP/WPO PLAN E&SC NARRATIVE 71B Job Number: 69 njn:D 1 19090 0 72C3 PITS, QUARRY RABUN CLAY (2-7% SLOPES) RABUN CLAY (7-15% SLOPES) RABUN CLAY (15-25% SLOPES) .i •, 72D3 SCALE. V = 100' j `mc i r. irOOLLBY 10 - LIc. NO. 3708 �0 8-17-2020 +`s`9jONAL "Odti Date: December 30, 2019 Revision: February 27,2020 J u ly 28, 2020 August 17, 2020 Scale: As Noted Sheet No.: ES 1.0 copyright © 2020 by Woolley Engineering 48 OAK 10 R - / j ( ,, °. 'O,, A ° WOOLLEY i' NGINEERING o. -- EROSION CONTROL LEGEND ,, 24 ,- --- — x ,,((�f BLANKETS &MATTING, + TR �.' Consulting Civil Engineers Street µ X @ CONSTRUCTION ENTRANCE,, NA 'III�`°� 3 X r,,�- '� E 7� � "�,�,, t Charlottesville Virginia 22902 (434) 973.0045 www.Wooti.ey-Eng.com ---'""� x DC DUST CONTROL � Owner. qB�. 'r,� I INLET PROTECTION 24, j '� Eli x3 j% �'"°`°. � I MULCH � � 1 The Tandem School y S �--.. L p�,`JEq ``� , '` x TR GRAVEL } R DPI OUTLET PROTECTION DRIVE TR j 24 x J 279 Tandem Lane Charlottesville, Virginia x - - ---'�� 4 ,� l TR i __ UDW `'"� ' PS PERMANENT SEEDING ? ` j � � • SAF SAFETY FENCETR 902 P: (434) 296-1303 SW � � R � � SW `' 1 1 - SW �` 15 TR � SF SILT FENCE ( ) ! " 40 P�E�10R L x TR N SR SURFACE ROUGHENING t j MAG 36 D' VSMP/WPO TR I 48 TO 18 1 T TREE PROTECTION 305 %} I j ii (! J(DTR PLAN TR x x 1 TR RAt�E TS TEMPORARY SEEDING 1 I 1 3 4 F iME G / TRj BU LIMITS OF DISTURBANCE , TR TR 5'`� x 1. SW 48 P TR 36`� R ,CEDAR F 4 h � 24 ' �15 NOTES: FO 1. Do not install bioretention early in the construction phase. DRIVPAVE DRIVE #295 Install only when the upstream site is fully stabilized. t� TR 2.5 STORY BRICK VATH l 2. The bioretention is to be protected from site runoff until the k 1 upstream site is fully stabilized. 0 BASEMENT ..� TR x k ,� 3. The topography by % SW ,.� CON C TR � 3 and existing site conditions were verified � ----" _--- ' 12 '� z ��t Woolley Engineering on February 20, 2020. ` — '� 3R X �__ _ - 4. Slopes with grades greater than 3:1 shall be permenantly { r� SW , --+�' stabilized with a meadow mix. + Z Meadow Mix - Seed: � / 3 lb. Little-Bluestem (schizachyrium scoparium) q, SW WW BV� P��_ .----" g � � � ,� � 1 lb. Black -Eyed Susan (rudbeckia fulgida 'goldsturm) � BW � � 1 lb. Blue-Stem1 lb. Wild Goldenrod(smot dolidaga "� U z v Q SAFETY WARNING SIGN �TM_ cassia) % d !LU Cm - t. `-�� � � � CONC. ! W � • Add Fall or Spring Seed to Meadow Mix - depending on time i dUW of Cl,� J - l . ,�� planting �, �,} 4 "�,,--.�..- •,�.. --- � � 6 1 - �/' � `'"�- Fall - 1 lb. lalium multiflorum & lolium psrenns x CM �, I S ��.` ` ~ Spring - 1 lb. coreopsis tinctoria & rudbeckia hirta � {� QD �J SW 1 5 W W Y BRICK AND ` 279 15 -. f 1 TOR + f FRAME BLDG '_" -� COS C. - _ METAL " ! ca _j J ' ._. � ,} ��. � ,._,..,•r-' TRAITOR --`• '`"°. �'` ! { ( GRAVEL '� ~ '' f # / O , LL. .. BW EXISTING i - ..» COMMUNITY ALL dOOD SHED` {� I W Z DING , D � i!lOOq SHED ..-:• -�'" � 1 � � � j ,-' TR 2 STORY SPLIT LEVEL CINDER BLOCK BLDG ! 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F - r 10� POP, ``-�---�,.,. ..�.. 07r» 520 - ' i ,Z Scale: 1 tt = 20' - ..�--- .� � SF $� ALANTH. 1 ap PAULO A 8" ALANTH. .._.-. /` Sheet No.. ••- EROSION CONTROL BLANKETS & MATTING .,� TEMPORARY CONSTRUCTION ENTRANCE .....- SHALL BE APPLIED TO S F �'� �°�-,. DOWNHILL SLOPES OF BOTH THE BIOFILTERILL AND SILT FENCING SHALL BE INSTALLED TO PROTECT THE BIOFILTER DURING CONSTRUCTION. SILT r ' CONTRACTOR SHALL FIELD -VERIFY LOCATION PROPERTY LINE 12,�0 + f - TO ES ....»" FENCING NEEDS TO REMAIN IN PLACE UNTIL - ---" 20' 0 20' 40' 60' STATE ROUTE 2 TRAP FOR , ....w-•-..-... _.._.._,. OF TEMPORARY SEDIMENT ---^- CONSTRUCTION ENTRANCE. (SEE SHEET ES3.0) THE SITE IS FULLY STABILIZED. SCOiiSV1LL.E RO -..... SCALE: 1 " = 20' 13 of 14 copyright © 2020 by Woolley Engineering TREE PROTECTION E ROUGHENING GHENING U `r G DOZER TREADS o CREATE GROOVES PERPENDICULAR TO THE SLOPE S\oP TRACKING " DEBRIS FROM SLOPE ABOVE IS CAUGHT BY STEPS DRAINAGE GREATER THAN VERTICAL GROOVE BY CUTTING FURROWS ALONG THE CONTOUR. IRREGULARITIES IN THE SOIL SURFACE CATCH RAINWATER AND RETAIL! LIME, FERTILIZER AND SEED, 2-3' (DEPENDING ON MATERIAL) 6-15" ILJ CUT STEPS WITH DRAINAGE TO THE BACK, AVOID LOW SPOTS. OUTLET PROTECTION A q 'IPE OUTLET TO FLAT kREA WITH NO DEFINED :HANNEL 0% d rM T SECTION A -A FILTER CLOTH KEY IN 6"-9"; RECOMMENDED FOR ENTIRE PERIMETER NOTES: 1. APRON LINING N MAY BE RIPRAP GROUTED RIPRAP G ABION BASKET, OR CONCRETE. CALCULATED G A 2. La IS THE LENGTH OF THE RIPRAP APRON AS USING PLATES 3.18-3 AND 3.18-4. 3. d = 1.5 TIMES THE MAXIMUM STONE DIAMETER, BUT NOT LESS THAN 6 INCHES. TS TEMPORARY SEEDING ACCEPTABLE TEMPORARY SEEDING PLANT MATERIALS PLANTING DATES SPECIES RATE (Ibs./acre) SEPT. 1 - FEB. 15 50/50 MIX OF ANNUAL RYEGRASS (Lolium multiflorum) & 50 -100 CEREAL (WINTER) RYE (Scaaee cereale) FEB. 16 - APR. 30 ANNUAL RYEGRASS 60 - 100 (Lolium multiflorum) MAY 1 -AUG. 31 GERMAN MILLET 50 (Setaria italica) SAF TEMPORARY SAFETY FENCE CONVENTIONAL METAL (T) OR (U) POSTS POLYETHYLENE FABRIC (ATTACH TO POSTS WITH METAL WIRES) 5'-0" MIN 18" MIN I 6'-0" MAX � I NOTE: CONTRACTOR MAY SUBSTITUTE TEMPORARY CHAIN -LINK FENCE WHERE APPROPRIATE. GATES AND OPENINGS SHALL BE FULLY COORDINATED WITH THE OWNER PRIOR TO INSTALLATION. CE PAVED CONSTRUCTION ENTRANCE (OPTIONAL) DRAINAGE SWALE DIRECTS FLOW TO SEDIMENT BASIN 3" SM-2A ASPHALT TOP COURSE EXISTING PAVEMENT 70' MIN. I 2%— 6„ MIN. FILTER CLOTH -- 2% Jar.•°•• a•• � �'„,� �� SIDE ELEVATION EXISTING GROUND 6" 21A AGGREGATE BASE EX. CURB OR EDGE OF PAV'T 70' MIN. ASPHALT PAVED A WASHRACK .Y .'..••:..' CRS 27 .c O SE:.: • �'° EXISTING ,' r,•, 2% i� I. ;r; .iti. PLAN ,•ti• PAVEMENT 4• POS. DRAINAGE /"� A TO SEDIMENT TRAP * MUST EXTEND FULL WIDTH OF INGRESS AND EGRESS OPERATION 2'x2'x2' SEDIMENT TRAP 1'x0.5' OUTLET #3 STONE PLAN VIEW 12' MIN. FILTER CLOTH SECTION A -A NOTE: A MINIMUM WATER TRAP OF 1 " IS REQUIRED WITH A MINIMUM WASH HOSE DIAMETER OF 1.5" SF SILT FENCE EXTEND FILTER FABRIC STAKE INTO TRENCH / M 4" 4" BACKFILL AND COMPACT THE EXCAVATED SOIL. A I POINTS A SHOULD BE HIGHER THAN POINT B. �A GENERAL NOTES - SILT FENCE 1) The height of a silt fence will be a minimum of 16 inches and a maximum of 34 inches above ground elevation. 2) Extra strength filter fabric shall be a continuous roll. When joints are unavoidable, a splice may be made at a support post with a 6' overlap. 3) The excavated trench shall be 4 inches wide and 4 inches deep on the upslope side of the proposed location. 4) Support posts shall be a maximum of 10 feet apart where wire support is used, and no more than 6 feet apart where wire is not used. When placing silt fence across a ditch or swale, the posts are to be set at a maximum 3' interval. 5) The trench shall be backfilled and the soil compacted over the filter fabric. 6) Silt fences shall be removed when the upslope area has been permanently stablized. ' ,f• •if COUNTY OF ALBEMARLE Department of Conuriunity Development Construction Record Drawings (As -built) for VSN1P The fallowing is a list of information required on construction record drawings for stormwater facilities (reference Water Protection Ordinance 17-422). It is preferable that the construction record drawing be prepared by sorneone other than the designer. Please do not provide design drawings as construction record drawings. A. A signed and dated professional seal of the preparing engineer or surveyor. B. The name and address of the firm and individual preparing the drawings on the title sheet. C. The constructed location of all items associated with each facility, and the inspection records to verify proper dimensions, materials and installation. The items include, but are not limited to the following: 1. Inspection Records and photographs for pipe trenches and bedding, including underdrains. 2. Video Pipe Inspection for any pipes which are not accessible or viewable. 1 Updated Location with geo-coordinates of all facilities. 4. Verified Drainage Area, maps for the drainage area treated, and for drainage to the facilities, 5. Current physical and topographic survey for all earthen structures. Ponds should include a survey of the pond butto_m. Surveys should verify pond volumes arc per design, Corrections may be rewired for alterations from the design. C. Plants, location and type. 7. Plans and profiles for all culverts, Pipes, Risers, Weirs and Drainage Structures - Display the installed type of drainage structures, culvert/pipe size, weirs, materials, inlets or end treatment(s), inlet and outlet protection, alignment and invert elevations compared to design. 8. Computations: For significant deviations from design, provide sealed computations verifying that the as -built condition is equivalent or better than design, 9. Ditch Lines - Display the constructed location of all ditch lines and channels, including typical sections and linings. 10. Easements - Show all platted easements with dead boob references labeled. Facilities and drainage must be within platted easements.:Provide copies of recorded documents. safety provisions Display e constructed location of, all safet 11. Guardrail, fences or other sa y p isp y the y provisions; fences, guardrail, including the type, length and applied end treatments, compared to design. M n w d ! verified ' . 12. Material layer — biolilter media, stone 1�tyers, sand Dryers, keyways an cores rrtt st be ve r.. as to material types and depths. Include inspection reports, boring or test pit reports and Iaterials certifications. Biofilter media must be an approved state mix, 13. Access roads -- show location of access roads, surface treatment, drainage;, etc, as applicably:. 14. Compaction reports are required to verify fill compaction in dams. 15. Manufacturers certifications for proprietary BMP's certifying proper installation and functioning. SILT FENCE DROP INLET PROTECTION 2 x 4" WOOD FRAME 1.: J 3' MIN V ELEVATION OF STAKE AND FABRIC ORIENTATION SPECIFIC APPLICATION npnp INI FT AT CORNERS THIS METHOD OF INLET PROTECTION IS APPLICABLE WHERE THE INLET DRAINS A RELATIVELY FLAT AREA (SLOPE NO GREATER THAN 5%) WHERE THE INLET SHEET OR OVERLAND FLOWS (NOT EXCEEDING 1 C.F.S.) ARE TYPICAL. THE METHOD SHALL NOT APPLY TO INLETS RECEIVING CONCENTRATED FLOWS, SUCH AS IN STREET OR HIGHWAY MEDIANS. WQOLLEY ENGINEERING Consulting Civil Engineers 210 5th Street NE Charlottesville • Virginia 22902 (434) 973.0045 www.WooIJey-Eng.com Owner: The Tandem School 279 Tandem Lane Charlottesville, Virginia 22902 P: (434) 296-1303 VSMP/WPO PLAN J 0 Q Z UZ� �Q' W J ry O Q w m r10000 � Q o w z � 0 Q E&SC DETAILS Job Number: 19090 THOFT'I LIC. NO. 37088`" �, �0 8-17-2020 }4? ti Date: December 30, 2019 Revision: February 27, 2020 April 17, 2020 June 24, 2020 July 28, 2020 August 17, 2020 Scale: As Noted Sheet No.: ES3, *0 copyright © 2020 by Woolley Engineering 14 of 14