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HomeMy WebLinkAboutZMA202100008 Correspondence 2022-02-08 (5)OLD IVY RESIDENCES PRESERVED SLOPES ZONING MAP AMENDMENT ZMA 2021-00009 JuLY 19, 2021 AMENDED: NOVEMBER 15TH, 2021 AMENDED: FEBRUARY 7TH, 2021 PREPARED BY: a TIMMONS GROUP YOUR VISION ACHIEVED THROUGH OURS. 608 PRESTON AVENUE, SUITE 200 CHARLOTTESVILLE, VA 22903 BRYAN CICHOCKI, PE Introduction A zoning map amendment is being requested per Section 30.7.6 of the Albemarle County Zoning Ordinance, to convert an area of preserved slopes to managed slopes within the Old Ivy Residences proposed development. The slopes that are being requested for reclassifcation, while 25% or greater in slope, are misclassified as preserved slopes and better described as managed slopes, as they are manufactured, which is made evident from previous documented site plans. Furthermore, the overall development plan is to reduce the area of these steep slopes, laying back the slopes, further reducing concerns of erosion and downhill degradation of waterways. While these slopes are being requested to be changed to managed slopes, there is a recognition of the County's goal, related to steep slopes, to reduce "rapid and/or large-scale movement of soil and rock, excessive stormwater run-off, siltation of natural and man-made bodies of water, loss of aesthetic resource ... all of which constitute potential dangers to the public health, safety and/or welfare." With that in mind, this application will discuss the following related to the conversion of these slopes to managed slopes: • Explore the existing conditions and designation of this area as preserved slopes versus managed slopes. • Protection and enhancement of adjacent and downstream land. • Mitigation efforts to eliminate effects of slope impacts Existing Conditions The property containing the currently designated preserved slopes within the development (parcels 06000-00-00-024C3, 06000-00-0024C4* and 06000-00-00-024C1*) is located off Old Ivy Road and the 250/29 bypass within Albemarle County. The subject portion of the property is adjacent to parcels 06000-00-00-024C and 06000-00-00-05100 (which are under the same ownership) to the east and the 250/29 bypass to the west, as shown below: *Note: TMP 60-24C4 was "created" by virtue of certificate of take (C-798017) at D.B. 1761, PG. 614. The certificate of take was then invalidated by the order found at D.B. 5330, PG. 110 and ownership reverted to the Now Filthy Beast, LLC. The invalidation of the certificate of take had the legal effect of eliminating the boundary between parcels 24C4 and 24C1, such that now they are once again combined into a single 5-acre parcel 24C1. Thus, the steep slopes being requested to be amended are within parcel 24C1 despite being shown in parcel 24C4 on the County GIS. Further, the surveyed location of the lot line (certificate of take) between lots 24C4 and 24C1 was found to be in a different location than Albemarle County GIS shows which also places preserved slopes on parcel 24C1. As such, reference to parcel 24C1 has been retained in this request. 11Page Figure 1: Slopes to be converted to Managed Slopes Per Albemarle County GIS, there are designated preserved slopes on this parcel, comprising an area of approximately 1.55 acres (outlined in green above). Per Section 30.7.3, the origin of preserved slopes is defined as natural features protected by county action from land disturbing activities. However, both of the preserved slope areas identified on -site appear to be the result of human activities. Historical imagery shows that slope "A" (adjacent to the 250/29) was a result of activity on the site in the early 1990's. Slope "B" was a result of waste fill generated from the North Grounds Connector Road project in the mid 2000's (see Figure 2 & Appendix A for further details). Under normal conditions outlined in Section 30.7.3a, this would likely lead to the classification of these steep slopes as managed slopes; however, they are currently classified as preserved slopes. We believe that the history of these slopes is an important factor in the consideration of this zoning map amendment to reclassify the slopes as managed. 2 1 P a g e � cr CONSTRUCTED STEEP SLOPE 1 Figure 2: Excerpt from North Grounds Connector Road Project Protection of Adjacent and Downstream Land Protection of adjacent and downstream land is an important consideration for any development, but particularly one that has both intermittent and perennial streams located within it. As noted below, development has been located to limit removal of forested areas, while protecting the natural area of the Rivanna Trail. Additionally, the impacts to the slopes will reduce the steepness of these areas, as well as the overall runoff across these slopes, reducing risks of erosion and/or slope failure. Proposed with the Old Ivy Residences rezoning application is a new residential development on the subject property. The proposed development has been laid out to limit disturbance to the steep slopes, while maximizing the conservation of forested areas, particularly adjacent to the existing Rivanna Trail, as much as possible (see Figure 3). Specifically, the development layout focuses on utilizing space already impacted by the existing farmland to minimize the disturbance to the surrounding forested areas, as well as some of the managed slopes which are identified in these areas. By impacting a portion of the currently designed preserved slopes, the neighborhood layout can better preserve existing natural forest, which provides an invaluable amenity to the neighborhood, prevents additional environmental concerns associated with deforestation (erosion, stormwater quality, habitat, etc.), and provides a greater degree of conservation. Given the history of the slopes on -site, Greystar and the design team agree that these forested areas hold a higher environmental value on the site than the previously disturbed, man-made slopes. Moreover, the impact to these slopes will result in a reduction to the stormwater that drains across this area, as the slopes will be reduced (the grade proposed is to cut these areas down in elevation), while 3 1 P a g e also capturing runoff in a stormwater conveyance (pipe) system, reducing overland flow and the total amount of runoff that these steep slope areas currently are subject to from a stormwater volume perspective. This change will result in a reduction to the potential of erosion over the remaining slopes, since those areas will see a limited amount of drainage over top of them. Figure 3: Residential Layout to Minimize Impacted Forested Area The proposed impacts to the existing preserved slopes are as shown in Figure 4 below and included in Appendix A: 4 1 P a g e I �► ^cam �' Ifs flip i MIL � 3 7f=l pil �nunf �YYIi.�""'1! WIN' nriilW�� Figure 4: Areas of Preserved Slope Disturbance On -site Mitigation Efforts In order to protect downstream land, adequate erosion control measures reviewed and approved by Albemarle County will be implemented during construction to mitigate runoff while preserved slope disturbance takes place. More specifically, downstream measures, such as wired -backed silt fence and sediment traps/basins will be required. Each of these measures will be placed in a way to ensure protection of the downstream lands, including the pond and beyond. Furthermore, the overall project is proposing to desilt and improve the existing pond to enhance the ecological benefits for the local habitat, improve the environmental impacts by adding vegetation and aquatic benching, while providing volume to meet stormwater quantity requirements. Summary of Justification for Rezoning While the steep slopes overlay district strives to protect preserved slopes within the County, it also affords relief through the zoning map amendment process when certain slopes are outside the criteria of those considered preserved slopes. Given that these preserved slopes were previously disturbed and generated by construction and waste fill, it stands to reason that they should be considered managed slopes. Additionally, even with this designation, the proposed impacts will further enhance the downstream waterways. While the proposed impacts do reduce the steep slopes within Albemarle 5 1 P a g e County, they ultimately enhance and improve downstream receiving waters, providing a betterment for the County, environment, and future population that resides at the Old Ivy Residences. As further justification for reclassifying these slopes, a critical analysis of each section of the zoning ordinance regarding the classification of slopes and how they relate to the slopes in this request is included below: Managed slopes. The characteristics of managed slopes are the following: (i) the contiguous area of steep slopes is limited or fragmented,• The two areas of steep slopes are not contiguous and are separated from each other. There are no other steeps slopes in close proximity. (ii) the slopes are not associated with or abutting a water feature, including, but not limited to, a river, stream, reservoir or pond, While there is a man-made pond nearby on the property, these slopes are not located in close proximity where they would be considered associated with this water feature. (iii) the slopes are not natural but, instead, are manufactured; As described in further detail in this narrative, these slopes are manufactured. (iv) the slopes were significantly disturbed prior to June 1, 2012; Slope "A", as shown on historical imagery, was a result of activity on the site in the early 1990s. Slope "B" was a result of waste fill generated from the North Grounds Connector Road project (now known as Leonard Sandridge Road) in the mid-2000s as shown in Figure 2 & Appendix A. Additionally, these slopes appear to have been created prior to the adoption of the Water Protection Ordinance in 1998. (v) the slopes are located within previously approved single-family residential lots; or The slopes are not located within previously approved single-family residential lots. (vi) the slopes are shown to be disturbed, or allowed to be disturbed, by a prior county action. While the slopes have not been shown to be disturbed in a prior County action, since UVA is not subject to County requirement, the North Ground Connector Road project (now known as Leonard Sandridge Road) did not have to go through County approvals, however, there is a plan that shows the creation of Slope "B" with that project. We have not found prior approval for the creation of Slope "A", however it is clear in the historical imagery that these slopes were man-made in the 1990s. Additionally, these slopes appear to have been created prior to the adoption of the Water Protection Ordinance in 1998. Preserved slopes. The characteristics of preserved slopes are the following: (i) the slopes are a contiguous area of 10,000 square feet or more or a close grouping of slopes, any or all of which may be less than 10,000 square feet but whose aggregate area is 10,000 square feet or more; Both areas of slopes are contiguous of 10,000 square feet or more. 6 1 P a g e (ii) the slopes are part of a system of slopes associated with or abutting a water feature including, but not limited to, a river, stream, reservoir or pond, While there is a man-made pond nearby on the property, these slopes are not located in close proximity where they would be considered associated with this water feature. (iii) the slopes are part of a hillside system; The slopes are not a part of a hillside system, but rather are located near a major roadway system. (iv) the slopes are identified as a resource designated for preservation in the comprehensive plan; The slopes are identified as preserved within the master plan, however, these slopes are manufactured and therefore, should not be considered a resource. (v) the slopes are identified as a resource in the comprehensive plan; The slopes are identified as preserved within the master plan, however, these slopes are manufactured and therefore, should not be considered a resource. (vi) the slopes are of significant value to the entrance corridor overlay district; or The ARB staff planner, Margaret Maliszewski, has not identified these slopes as significant value to the entrance corridor overlay district. Nor do we have any reason to believe that these man-made slopes add value to the entrance corridor. (vii) the slopes have been preserved by a prior county action, including, but not limited to, the placement of an easement on the slopes or the acceptance of a proffer or the imposition of a condition, restricting land disturbing activity on the slopes. The slopes have been identified as preserved within the master plan, however, these slopes are manufactured, a result of construction and waste fill. 7 1 P a g e Appendix A OLD IVY HISTORICAL IMAGERY NORTH GROUNDS CONNECTOR ROAD PROJECT WASTE FILL PLANS Is] 1111vfgl194»_1► EI V NOTE: THIS PLAN IS FOR EROSION CONTROL. PURPOSES ONLY! NORTH GROUNDS - CONNECTOR ROAD PROJECT SITE PROPOSED WASTE AREA SITE t 1 Y,t�r i1 ,��w � ♦ +Rii i.N yli�y WE LOCATION VICINITY MAP DCR Minimum Standards MS-1 Permanent or temporary soil stabilization shall be applied to denuded areas within seven days after final grade is reached on any portion of the site. Temporary soil stabilization shall be applied within 7 days to denuded areas that may not be at final grade but will remain dormant for longer than 30 days. Permanent stabilization shall be applied to areas that are to be left dormant for more then one year. MS-2 During construction of the project, soil stockpiles and borrow areas shall be stabilized or protected with sediment trappings measures. The applicant is responsible for the temporary protection and permanent stabilization of all soil stockpiles on site as well as borrow areas and soil intentionally transported from the project site. MS-3 A permanent vegetative cover shall be established on denuded areas not otherwise permanently stabilized. Permanent vegetation shall not be considered established until a ground cover is achieved that is uniform, mature enough to survive and will inhibit erosion. MS-4 Sediment basins and traps, perimeter dikes, sediment barriers and other measures intended to trap sediment shall be constructed as a first step in land -disturbing activity and shall be made functional before upslope land disturbance takes place. MS-17 Where construction vehicle access routes intersect paved or public roads, provisions shall be made to minimize the transported onto a paved or public road surface, the road surface shall be cleaned thoroughly at the end of each day. Street washing shall be allowed only after sediment is removed in this manner. This provision shall apply to individual development lots as well as to larger land disturbing activities. iment control measures shall be removed within 30 MS-18 All temporary erosion and sed days after final site stabilization or after the temporary measures are no longer needed, unless otherwise authorized by the local program. Trapped sediment and disturbed soil areas resulting from the disposition of temporary measures shall be permanently stabilized to prevent further erosion and sedimentation A Ll SITE p e 0 Erosion and Sediment Control General Notes- P 0 D E-1 The temporary erosion and siltation control items shown on the E&S Control Plan are intended to provide a general plan for controlling erosion and siltation within the project limits. The E&S Control Plan is based on field conditions at the time of plan development and an assumed sequence of construction. The contractor, in conjunction with Project Engineer and/or Environmental Monitor, shall adjust the location, quantity and type of erosion and siltation control items required based on the actual field conditions encountered at the time of construction and the selected sequence of construction. E 6 Silt removal and sediment clean -out from erosion and siltation control items shall be performed in accordance with following: Temporary Sediment Basins and Sediment Traps — When the "wet" storage volume (permanent pool) has been reduced by 50%. Dewatering Basins — When the excavated volume has been reduced by 50% All other Erosion and Siltation Control items — When the capacity, height or depth has been reduced by 50%. HIKING TRAIL NOTE: Currently an existing hiking trail (not shown on the plan) runs through the proposed waste area. A satisfactory detour will need to be approved and proper signage will need to be installed after construction. All hiking trail arrangements shall be coordinated with Dick Lawrence. DETAIL 1 SECTION A -A SECTION A -A NOTEst DETAIL 3 SECTION A -A L mow tNE N.tAitoHi vuer�aun a ...v WL 35 dRSDE THE WDTH tWl. Ep Qppyp 2. ON pp EIiDWIW Y EW5Ec1T10µH �TEGifORON COt�STNR CION�S iE ffI AOOORDNICE. W(FN OETNI, 2 IN /80YE. ODD v 3, CEOIEXTiE FIHRIC TO DE TIDNSNSTNAW UIIDTR NA EROSION CON7R01. STORE W ACCORD/NCE WNH nE SPEC67CA. SpX, d ` ww 4, GLVVERTIGN�`rHT FOR0.8D%A T1CN'OR ART. TTyy�ppIID0 gg��DCTRIM SFbWN ON PUNS OR FOR S�EyT,CPE.SOTTOM MTH AND DEPTH f,EOTf%TLE N/NNE4 WTCN E%R1WO ORCIi OR HA,URK CrtaJtN. SECTION B-B cuss r CVSS= 3• STONE FOR EROSION CONTROL 2u VWOMA DEPARTMENT OF TRANSPORTATKIN It<1 114.01 z••o• Rouemwa tocnoxa.) �.— COEIPACTCO WR 4E OW TEMPORARY DIVERSION DIKE NOTE: :• THE ONN}NEL CREATW BEORD M OWE SCAL NAVE A POSTRIE CRANE TO A STIPUDEO OU}LET. THE CI u SNN.L SE STN MVO.AS Hea"ARY.70 TM=VENT EROSION. 2. 1EUPORMY OWSNM ONE MV RE MM MED " PAD FOR M ACCORDANCE WNH SECTION W3 Oi THE SPECMH;A,IONR. TEMPORARY DIVERSION DIKE "Wilk OSPARTNWt OF TRANSPORTATION ri TYPICAL DETAIL FOR TEMPORARY TYPICAL DETAIL FOR TEMPORARY FILTER SILT FENCE/CHECK DAM AT TOE OFFILL SARRIER/SILT FENCEtCHECK DAM AT CULVERT A sar l"" ENOWNL FENCE ( 1-- l TOE OF GILL CULVERT TOE OF Fat •+ P FLOW-• i Ft°W L.. NOTE: A DA" FLOW CNWK OA" uIECE DMI R H OHECK DAN S TO SE C flUC1W IN ACOp�,E CHECK ORE" M FLIER NNW¢R! iNE RUN) 0.`M ORtDCE i SPECIFlCAtwNs, AYa STAAMD EC-4. SEE NOTE 3 tkT STRICE NOTES: TENPORMY 'T� FLIER RAMIER - SOW H S J• t. N MYY PORTKM OF FKL IO GREATER TNM Y gLT UM Is REOUIRFb• P ia4 12(GIIT IS LEISS FtOW TNON 5', FII.TFR RAVf�R IS AEOUOtEb, 2,R02W CNECII DA4- M TO RE C STMMTRp M ACCOR u RE µµ11m THE aow u"m TNOOOE "MOR DNA 2' SECTION A -A E%TRtA �STRENOTN TEMPORARY SILT FENCE OEO E% R.E FFNRIC POSTS `+IIA.L DE AA �.P6t/1. 2%q" XT,' OR A 3'• eu"o, sour A Ho SPEC�MAIMNS.NW STAIDMO EC•t. ` s.MsrA+c s•wmMN AND Is ro eE caurANEo WRNN T OF WAY OR EMEMUST• FOR TEMPORARY TYPICAL DETAIL FILTER HARRIER/CHECK DAM. AT TOE OF FILL Of 1.2'u tOu: POERR UNENiT µo RWRm+.LETwcTN OF 5'FOR TEMPORARY MTT TES. Of IEVPORARY A ,r T RAMafl OKCI TU01( OR SU MU aEwoR o TOP END sEcnoN. SEE OEM A TOE or rat 1 TEMPORARY FLIER BARRIER RED EXTRENGTRA cftou"oE"POS TOE Oi FRL NOTEq y PRONDE "TOUO0KK TH gnA"TMTN�HI. SITILTER (SLT FENCE) OEOTEXtaE 24" „RL FPNRIC q( /N 'E FLOW L+A N A Rp�oqa A•COWIONiGj OR SIR���O� OftCW T� EN3W WITH Ao/o BR00fM MD ENECK 0 p1ECK DA" SPECNKiAT STM'0 EC•4. EN}RA STRENGtN CEOTEKTLE rZO iaL TREHCN•70 •, w T�TLf L PLAN 'SEE AICNORpO{OTTO",'•••• OFP�ABOIC. * .1M1 "ROY MR FLOW DETAL A C�ONVAOCi TRENCl1 WPM. THOROUGHLY 8" OEEP X S. WAE H 2 3' PLOW NOTEt * CHECN OAW SUPPORT6 F0��1ARf 1'rORFA BARft�S A Y - gg ylPppyEO AMltERH TE t'tWt SECTION A`A NO.2 SOUTHERN I. A i01, E(6i °fliesD. vle LI.wsE�eBE FO F DETAIL A Sffi0 To taENLQswI TEMPORARY SiLT FENCE AND FILTER BARRIER �NL'FEC nEN VMOMA DEFART"ENT OF TRA6PORTAIMN Low 403 Diversion Dikes Rock check Darns and/or Temporary Slope Drains wih be provided as required to direct and maintain flow to the north side of thepool and to prevent erosion of channels leading to the basin GENERAL NOTES: 1. THE CONTRACTOR SHALL CONTACT "MISS UTILITY OF VIRGINIAN (1-800-552-7001) AT LEAST 48 HOURS PRIOR TO BEGINNING WORK IN ORDER TO DETERMINE THE EXTENT AND LOCATION OF ALL UNDERGROUND UTILITIES WITHIN THE PROJECT LIMITS. UTILITY COMPANIES WILL BE NOTIFIED THROUGH "MISS UTILITY" PRIOR TO ANY EXCAVATION OR GROUND PENETRATION. 2. ALL CONSTRUCTION METHODS AND MEASURES ARE TO BE IN ACCORDANCE WITH V.D.O.T. ROAD AND BRIDGE SPECIFICATIONS DATED 2002, THE ROAD AND BRIDGE STANDARDS DATED FEB. 1, 2001, AND THE VIRGINIA WORK AREA PROTECTION MANUAL DATED JAN., 2003. 3. GRADING OF ALL SLOPES SHALL BE KEPT TO A 2:1 MAXIMUM. SURVEY INFORMATION NOTE: THIS PLAN IS BASED ON TOPOGRAPHIC AND SURVEY INFORMATION SUPPLIED TO FAULCONER CONSTRUCTION COMPANY BY PARSONS, BRINKERHOFF, QUADE AND DOUGLAS, INC. IT IS OUR UNDERSTANDING FROM FAULCONER CONSTRUCTION COMPANY THAT WE ARE AUTHORIZED TO USE IT FOR THE PURPOSE OF CREATING A WASTE AREA PLAN. Disposal Areas Note Based on Memorandum of Agreement with Virginia Department of Environmental Quality And Current Solid Waste Regulations Materials that cannot be disposed of in a disposal area: • Antifreeze _ • Asphalt (liquid) ■ Building forms • Concrete with exposed rebars ■ Curing compound ■ Fuel • Hazardous materials ■ Limbs • Lubricants ■ Metal ■ Metal pipe ■ Oil ■ Paint • Stumps . ■ Tree trunks • Wood or metal from building demolition Materials that may be disposed of in an approved disposal area: • Asphalt (solid) ■ Brick ■ Cinder block ■ Concrete (without exposed rebars) ■ Dirt Rock Disposal areas located on VDOT rights -of -WAY must be covered with 2-feet of clean material, placed on a maximum 2:1 slope, and seeded with the seed mix recommended on the Roadside Development Sheet or with a recommendation from the Transportation Roadside Development Manager. If the area is predominately wet or has plants that appear to be wetland species — have the District Environmental Section took at it before placement of materials. Disposal areas located on private property must be covered with 2-feet of clean material placed on a maximum 3:1 slope and seeded with the seed mix recommended on the Roadside Development Sheet or with a recommendation from the Transportation Roadside Development Manager. if the area is predominately wet or has plants that appear to be wetland species avoid placement of material. Stumps should not be buried either on or off state rights of way. However, if they are buried solid and vegetative waste regulations must be followed. These include: • Notification of all adjoining property owners 14-days prior to opening the vegetative waste disposal site. • Survey of site before material is buried and record in local courthouse. • Survey at time of closure showing location of all materials buried, recording with property information in local courthouse. ■ Notification of all adjoining property owners within 48-hours of closure. ■ Installation of groundwater and methane gas monitoring wells. ■ Monitoring materials collected in wells and reporting annually to Virginia Department of Environmental Quality on findings. • Providing corrective measures should pollutants be detected in wells. Stumps and tree trunks (non -merchantable timber) may be ground into mulch, stockpiled, and beneficially used. if stockpiled, the pile must be reduced by 75% within 12-months. Ground chips may be given away for use as mulch or fuel. Ground chips may be used to stabilize bare areas, however, they should not be piled more than 2-inches in depth if used for this purpose. TABLE OF CONTENTS - NOTES, MISCELLANEOUS DETAILS SHEET 1 -COVER SHEET SHEET 2 - EXISTING SITE CONDITIONS SHEET 3 - PROPOSED WASTE AREA GRADING AND EROSION CONTROL MEASURES SHEET 4 - SEDIMENT BASIN DETAILS AND NOTES 0:\8ILLL\TMPR0J\N0RTH GROUNOS\EROSIONCONTROL.PRO a REVISIONS APRIL 14, 2005 VDOT & DCR COMMENTS DATE Jan. 6, 2005 SCALE AS SHOWN CONTOUR INTERVAL 2 FEET Q= U LIJ UJ H � a3Z[L 0 y O >>pWs M0(t000z 0p(9ita:0 Z F"■ 0 (L50 0w �O ZZ u„ U ZZ ZZ U g^ CL FILE NUMBER 8221 SHEET 1/4 Ili v. f,. :@ F T; 9't E 1';it` c89•' as :`' 1 Y! & d / \A /` f y e �t' ",2 _ � , ;y r zm e s x• ": , ., r r „ rig. a rart^'w'wra,',,,'......... ` ;fgAJe•�,,,' 1 r .f "' r�".•r:: .:^" ( t , ,r e,, '°°�' x,, '/r \ 817JT., gi.71' uay 4 Y `, , « . $ ♦ ww Y , I .n/ , v \ \ W._ ,...w,•O r:•.+, of { •::':i' Z 4 : `h , \. ... _ i,a n ... x .. v,. y„ ,, " r." w, r . rao" \. „ .. ...::' 'm: F' :F:°s>wr,n,Ns:- i ,. •+, 'a.. x,. .... a".%.xw "'.wr`•.. sr ' � "'.r..,: , \ ,f' �. 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A '``a `'`\ S 1. #g ' \ €F 'J IY�^ \ 3: i } 3 f =i is �, t�; �,. ?r i 4 JJ , Qj 7 l a 'i S , y t 1 d -.,a •Y,P, ;& @, ,,.. , " h O i y ', \@ V' ~, A r v � ` \ ,\ `\ t t �` '`\ \ ` `; ' � a ` `. \\, `` ,\l \ ` �3 ` \ t \\ :,/ ` A } / ` , r/ �' \\ ',/J lFt i ;ice., W r } p I�3 s� ft5 < F.' ", J',.4 f: { :\ " 0:\BILLL\TMPR0J\NORTH GROUNDSWROSIONCONTROL.PRO�/ a U(5 w 2 N O Z q �Z = v1 Z z� Nm a �Qjj N Q 4 �Q V �. A /� t•• � Z "r Q (9 ci �C W 5 p0 0 g ace LL Z lO o az p v4 z a(0 � _' Q I W L` r Q 2 gO �z Q � � to 2 (5 U o 1 N i 1 1z °� � O ^y W �� LL 9 W J V z W z O U aN O 1 �� Z W O W aW 2 T P Q °' W z 92 O W x O a x REVISIONS APRIL 14, 2005 VDOT & DCR COMMENTS DATE Janes. 6��,1,2C005 flw CAA LE 1" = &Y HORZ CONTOUR INTERVAL 2 FEET �� W .Y I . It W W • Z� Q W/Q�y7N E- -296 = O s ¢boa >Jz Z Q Ic u] 0` Wp04Q�"'� 0 ())— �WZo 0 0 F O U 0Z=itaV� a M2 ow �, oI oozZNO U "z oaw 0 g"aa.. °z a FILE NUMBER i 8221 SHEET 3/4 0 SEDIMENT BASIN SCHEMATIC ELEVATIONS MIN. DESIGN HIGH WATER �%- A (25—YR. STORM ELEV.) MIN.,2. '� 5 : 1 SLOPES SEDIMENT CLEANOUT POIM - (--�I ANTI —SEEPAGE COLLAR DESIGN ELEVATIONS WITHOUT EMERGENCY SPILLWAY (RISER PASSES 25-YR. EVENT) SOURCE: VA. DSWC PLATE. 3.14-2 SEDIMENT BASIN DATA TOP OF RISER = 597.0 INV. OUT (RISER) = 590.0 65' - 18" CMP @ 3.08% INV. OUT (PIPE OUTFALL) = 588.0 CLEANOUT ELEV. = 592.5 APPROXIMATE BOTTOM OF BASIN = 590.0 TOP OF DAM = 600.0 DEWATERING ORIFICE INV. = 594.25 DEWATERING ORIFICE DIA. = 4" FLEXIBLE TUBING DIA. = 6," INSTALL 6' x 6' ANTI -SEEPAGE COLLAR 4' FROM RISER RISER PIPE BASE CONDITIONS FOR EMBANKMENTS SOURCE: VA. DSWC YLAlt. J.14-14 RECOMMENDED DEWATERING SYSTEM FOR SEDIMENT BASINS PROVIDE ADEQUATE STRAPPING TACK WELD CORRUGATED METAL RISER POLYETHYLENE CAP (0.5' BELOW TOP OF RISER) r r c ANTI— VORTEX DEVICE DESIGN �-- NOT REQUIRED cY O A A O O TOP STIFFENER (IF REQUIRED) I5X— X_ ANGLE WELDED TO TOP AND ORIENTED PER- PENDICULAR TO CORRUGATIONS. ALL AROUND #6 X 12"— SPACER BAR (TYPICAL) DEPTH VARIES AS ERFORATED POLYETHYLENE REQUIRED -- FOR `DRY DRAINAGE TUBING, DIAMETE " VARIES (SEE CALCULATIONS N STORAGE APPENDIX 3.14—A) WET "FERNCO—STYLE " COUPLING STORAGE DEWATERING ORIFICE, SCHEDULE 40 STEEL STUB 1—FOOT MINIMUM. DIAMETER VARIES (SEE CALCULATIONS IN APPENDIX 3.14—A) NOTE: WITH CONCRETE RISER. USE PVC SCHEDULE 40 STUB FOR DEWATERING ORIFICE SOURCE: VA. DSWC DRAINAGE TUBING SHALL COMPLY WITH ASTM F567 AND AASHTO M294 PLATE. 3.14-15 U C PLAN VIEW rg D _! RI—SER D-IAMETER 1 24" SECTION A -A O O TOP IS _ GAGE CORRUGATED O METAL OR 1/8" STEEL PLATE. PRESSURE RELIEF HOLES MAY BE OMMITTED, IF ENDS OF CORRUGATIONS ARE LEFT FULLY OPEN WHEN THE TOP IS ATTACHED. WE DED CYLINDER T-06 GAGE CORRUGATE METAL PIPE OR FABRICATED FROM H 13" 1/8" STEEL PLATE. �� �✓� NOTES: S'M e" MIN. I. THE CYLINDER MUST BE FIRMLY FASTENED TO THE TOP OF THE RISER. UPPORT BAR SIZE 2, SUPPORT BARS ARE WELDED (#6 REBAR MIN.) TO THE TOP OF THE RISER OR ATTACHED BY STRAPS BOLTED TO TOP OF RISER. ISOMETRIC DETAILS OF CORRUGATED --METAL- ANTI —SEEP COLLAR INSTALL COLLAR MI COPPUBATIONS VERTICAL OLLAR TO SE OF SAME GAGE AS THE PIPE WITH WHICH IT IS USED CONTINUOUS MEL6--� v✓ /2' X 2' SLOTTED HOLES FOR 12' NIN. 3/8' DIAMETER BOLTS e o +-1j-2° ul BAND T HELD BOTH SIDES SLOTTED HOLES CORRUGATED METAL ONTINUOUS HELD AT B• D.D. SECTION B-B SWEET WELDED SAAM ELEVATION OF UNASSEMBLED COLLAR3. UNASSEMBLED COLLARS SHALL BE MARKED BY NOTES FOR COLLARS: PAINTING OR TAGGING TO IDENTIFY MATCHING PAIRS. 1. ALL MATERIALS TO BE IN ACCORDANCE WIT41 THE LAP BETWEEN THE TWO HALF SECTIONS CONSTRUCTION AND CONSTRUCTION MATERIAL AND BETWEEN THE PIPE AND CONNECTING BAND SPECIFICATIONS. SHALL BE CAULKED WITH ASPHALT MASTIC AT 2, WHEN SPECIFIED ON THE PLANS, COATING OFTIME OF INSTALLATION. COLLARS SHALL BE IN ACCORDANCE WITH 5. EACH COLLAR SHALL BE FURNISHED WITH TWO CONSTRUCTION AND CONSTRUCTION MATERIAL 1/2" DIAMETER RODS WITH STANDARD TANK SPECIFICATIONS. LUGS FOR CONNECTING COLLARS TO PIPE. DETAIL OF HELICAL PIPE ANTI -SEEP COLLAR WELD 1 SIZE AND SPACING OF SLOTTED ANGLE ] /8" XMIDE/AS XSIIOMN/IN ANGLES DRAWING.o COLLAR OR BEND A'90 OPENINGS SHALL BE THE SAME NOTE FOR BANDS AND COLLARS: AS SHOWN FOR CM COLLAR. ii/e MODIFICATIONS OF THE DETAILS USE RODS AND LUGS TO CLAMP SHOWN MAY BE USED PROVIDING BANDS SECURELY TO PIPE. 1I/S•EQUAL WATERTIGHTNESS IS MAINTAINED AND DETAILED 12, MIN. DRAWINGS ARE SUBMITTED AND APPROVED BY THE ENGINEER PRIOR BAND OF z'"SHE TO DELIVERY. 'AirHELICAL PIPEISOMETRIC VIEW METAL COLLAR SHALL BE CUT TO FIT ROD AND LUG WELDED WITH A CONTINUOUS WELU. NOTE: FOR DETAILS OF FABRICATION DIMENSIONS, MINIMUM GAGES. SLOTTED HOLES, AND NOTES, SEE DETAIL ABOVE. METAL COLLAR TO HE NOTE: TWO OTHER TYPES OF ANTI —SEEP COLLARS ARE: WELDED TO CENTER OF HELICAL PIPE BAND 1. CORRUGATED METAL. SIMILAR TO UPPER, EXCEPT SHOP WELDED TO A SHORT (4FT.) SECTION OF THE PIPE AND CONNECTED WITH CONNECTING BANDS TO THE PIPE. PARTIAL ELEVATION 2. CONCRETE, SIX INCHES THICK FORMED AROUND THE PIPE REF: ENGR, FIELD MANUAL WITH #3 REBAR SPACED 15" HORIZONTALLY AND VERTICALLY. SOURCE: USDA-SCS PLATE. 3.14-13 0: \BILLL\TMPROJ\NORTH GROUNDS\EROSIONCONTROL.PRO �i REVISIONS APRIL 14 2005 VDOT &'OCR COMMENTS DATE Jan. 6, 2005 SCALE AS SHOWN CONTOUR INTERVAL 2 FEET N W F a= �Z E" E" Z Q�311 ZdJz N01roW 0E—Occo$ nWU2CCZw Z 0Q -- tcr'd< IL D cc0ZZma OV ZZ W ZZ 02 a Q) FILE NUMBER 8221 SHEET 4/4 u 0 o�mmx� A P3m Co wrn T3 P -1 N " A f ' y/7�� j (J) Z/_�%/ice { cn 1 r O f2 J i Ill cn m JJ/ vm f m/ , TIMMONS GROUP .••o0%0 OLD NY GREYSfAR APP11C4T10N PIAN THIS DRAWING PREPARED AT THE CMARI OTTESVILLE OFFICE 608 Preston Avenue, Suite 200 1 Charlottesville, VA 22903 TEL434.295.5624 FA%434295.8312 ve+ .timmonssom ml ON OLD IVY RESIDENCES I ; ° ; g REV5ERCOUNTYION COMM (? m O O ` it/OS 21 R 0 PER MEN ALBEMARLE COUNTY " I PRESERVED SLOPE IMPACTS m