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Home My WebLink AboutSDP201800031 Review Comments Final Site Plan and Comps. 2018-06-26COUNTY OF ALBEMARLE Department of Community Development 401 McIntire Road, Room 227 Charlottesville, Virginia 22902-4596 Phone (434) 296-5832 Fax (434) 972-4126 Site Plan review Project: Rivanna Village Phase 2, Block F, G, H, I, & J —Final Site Plan Plan preparer: Alan Franklin PE, LLC /427 Cranberry Lane, Crozet, VA 22932 [alan(&alanfranklinpe.com ] Owner or rep.: Rivanna Investment Holdings LLC, 150 West Main St. Suite 1100 Norfolk, VA 23510 Plan received date: 4 May 2018 Date of comments: 26 June 2018 Reviewer: John Anderson Project Coordinator: Christopher Perez SDP2018-00031 1. VSMP Approval required prior to Final Site Plan Approval. a. Provide VSMP Plan that meets requirements of 17-401. b. Provide vehicular access /Access easements to SWM facilities. c. Provide receipt of recordation of SWM Facility Deed of Dedication. d. Ref. prior -approved WPO# if prior approved plans are relied upon. e. Provide Mitigation for stream buffer and wetland impacts. 2. Road Plan Approval required prior to Final Site Plan Approval. 3. Provide trail standard detail meeting Albemarle County Design Standards Manual Std. 4. Sheet 2, Note 17: Owner shall be responsible for posting the ESC bond. Revise note. 5. Sheet 2, Note 24: Appears incomplete. Please revise. 6. Sheet 4: Label all wetlands. Label 100' stream buffers. 7. A separate Road Plan is required. Please submit a Road Plan with Application and required fee. 8. Sheet 4: Provide calculations for ADT. ADT appears inconsistent; for example: Cattail Court 42 Attached units (G1-G42), ADT =200, while Terrapin Trace 14 Attached units (I48-I62) ADT =200. Mossy Rock Rd. 18 single-family (J39-J57) ADT =100 appears low, while Meander Way (12 single- family units, I35-I47) ADT =100, is more reasonable. Reference ITE Trip Generation Manual, most recent volume, when calculating ADT. 9. Sheet 6: Rt. 250Improvements single lane addition typical section appears to indicate 2" SM-12.5A tapers to zero thickness (0") at edge of 8' paved shoulder; confirm consistent with VDOT standards. Sheet 8 / CONTECH BridgeCor® Arch Structure 10. Ref. 2016 VDOT Road & Bridge Specifications for pre -cast arch requirements /302.03.b. 18. 19. 20. Engineering Review Comments Page 2 of 9 (b) Precast Drainage Structures: Submittal of designs for precast items included in the Road and Bridge Standards will not be required provided fabrication is in accordance with the Standards. Submittal of designs for precast box culverts produced under the VDOT Precast Concrete Quality Assurance Program by a manufacturer on the Materials Division's Approved Products List 34 will not be required provided the Contractor submits a certification that the item shall be fabricated in accordance with the preapproved design drawings. Requests for approval of a precast design shall include detailed plans and supporting com- putations that have been signed and sealed by a Professional Engineer having at least 5 years experience in structural design of precast structures or components proposed and licensed to practice engineering in the Commonwealth of Virginia. Unless otherwise specified, concrete Provide high definition images with legible text details for each CONTECH BridgeCor® Arch Structure detail. Most text is illegible. Illegible Specifications for Manufacture and Installation of CONTECH BridgeCor® Arch Structure is of particular concern. Please provide legible Mfr./histallation text. Provide PE -seal for each CONTECH BridgeCor® Arch Structure detail. Site Plan PE -seal is insufficient unless Site Plan Professional Engineer holds PE certification in structural engineering discipline, and seals each CONTECH detail on sheet 8, not simply plan sheet 8. Provide structural details, including plan /profile view with dimensions, for reinforced concrete headwall. Detail on this sheet indicates `supplied by others.' Furnish plan /profile structural detail sufficient to evaluate adequacy and integrity of concrete headwall design. Provide reinforcement detail, including plan /profile views with dimensions, for reinforced concrete arch footing. Albemarle County Building Inspections Division permit may be required. Applicant is encouraged to coordinate with Building Inspections on building permit requirements for proposed 34'-1" X 9'-2". Note: Notes on schematic of proposed Contech detail (top right corner, sheet 8) are problematic: "Footing dimensions and details shown are conceptual only"; "Final dimensions and details to be furnished by the Project Engineer"; "Foundation reinforcing to be determined." These notes indicate final design is to be performed by Project Engineer, relative to arch footings. Provide: footing dimensions and calculations supporting design for this site and location (soil type, dead /live load, etc.); final dimensions /details; and foundation reinforcing details. Provide calculations that support footing design. Details reference single radius arch: This does not appear to be a single radius structure; check label. Sheets 9-19: Base sight lines on design speed (posted speed limit + 5MPH). Example: sight line at Int. Moose Lane and Lazy Branch Lane would appear to be 335'. Check /revise sight lines, as needed. Sheets 9-19 /CG-12: Ramps at perpendicular crossings are shown as diagonal crossing ramps. Revise per VDOT standard —compare images: DETECTABLE wARnNC SURFACE, B PLICATION NU RAMP LENGTH FEET Ef cure e^ cuRe 5 A ♦'SGUME LANDING AAEA —1. L'F TRAVELWAY SHALL BE PROVIDED FOR 6 9 GA055W ALK PERPENDICULAR CROSSWALK E 12 WITNN THE U.I. CR955WALN uiEA, q 15 TS A PARALLEL RAUP EG LE55 OF THE SHEET 3 a a CC-12 DETECTABLE WARNING SURFACE TYPE B (PARALLEL) APPLICATION REv. ]i05 LRGINIA DEPARTMENT OF TRANSPORTATION 20396 Engineering Review Comments Page 3 of 9 Sheet 14 21. Sheet 11: Provide Auto -turn figs. /driveway geometry, multiple lots, including I-60, -61, -62, -64, J-1 (sheet 18), etc. Propose smooth curves as opposed to angles which necessitate off -pavement turns /maneuvers to enter and exit drives. Review all driveways. (Also item #36) W y I I N 15-TOWN GARAGE E —Iflj l I 20, I I TYP. 10o I 34.3' Tom• LOT 1.69 LOT 1-60 LOT 1-61 LOT I.62 'JT I S I 2, 02 $F 2,412 SF I I 2,663 SF 3,080 SF I 4,668 SF 860 SF I I I I I I rT 7j.19 RONT ETRA K, TYP ] I� I II I II I 22. Sheet 14: Street Name signs are proposed for atypical locations at Int. Lazy Branch Lane and Moose Lane, and at Int. Lazy Branch Lane and Cattail Court. Revise to appear in conventional location on street with stop sign. Defer to VDOT comments for public roads. 23. Sheet 14: Recommend relocate street name /speed limit and any required signs from radial sections of roadway to tangent sections, wherever possible. 24. Sheet 14: Revise Matchline (right margin) to read sheet 15. 25. Sheet 15: Provide sight line easement on Lot I-4. Engineering Review Comments Page 4 of 9 26. Sheet 16/18, 18/19 (at Matchline) —Label road radii, Lazy Branch Lane. Review horizontal road curves. Label all horizontal road curve radii in plan view. 27. Sheet 20: Revise value in parenthesis to match design speed (60, not 25). Check profiles captions. 28. Sheets 20/21: Profile ref. to Butterfield and Park may not match proposed road names. Please confirm. 29. Ensure arch spans on Terrapin Trace (sheet 24) and Lazy Branch Lane (between Mossy Rock Rd. and Moose Ln.; sheet 25), the two 8' X 4' and the 4' X 2' double box culvert (sheet 26) pass the 25-year storm event without roadway flooding. Portions of development have no outlet save crossing one or more of these culverts. Recent local flooding lends particular impetus to conservative design. 30. Sheet 28: Provide paved concrete channel (and detail) between two pipes south of Rt. 250 to prevent nuisance ponding. Fall between outfall of one and inlet of the other is only 0.5% (0.12' over 23.5'±). 31. Sheet 28: Provide drainage easement for storm pipe, NE corner lot I-31. 32. Sheet 32: Provide drainage easement for storm line between SD 2J3-1 and SD 2J3. 33. Sheet 34: Proposed forest /open space easement 1' from edge of basketball court and on a portion of tennis court playing surface is ambitious. While proposed Forest /Open Space easements are generally consistent with DEQ Training Module 4, Engineering cannot approve proposed easements in such close proximity to developed features (sports courts, lots, etc.). Revise, as needed. (hos://www.deg.vir ig nia. og_y/portals/0/deg/connectwithdeg/trainin swMZplanreviewswmpiz modul e4.pdf ) - --- J .MATCHLINE - SEE SHEET 36 Sheet 34 —Revise proposed Forest /Open Space Easement located interior to Lot lines. Do not show Forest /Open Space Easements on any portion of any lot unless Owner intends to convey lots with portions that may never be turf or impervious but must remain open space /forest, in perpetuity. Engineering Review Comments Page 5 of 9 1 ^V rrII.. V EXTENC EIL 4" PVC SNI. LATERAL �! !! �/L I LOT H"1 1 Sr 1 I� FEE K F ESa&W � � � f 7A0 3BBSd 1'IAPE NCOPP£R jf W5A'aTEw SERJICE. TYP, � I'. TER � i METER IWMA TW, TAO 1, LOT H-2 I 4,4d0 SF � J FFE iF5,5a r,00.• Pvc saN. � I1 LATERPL ! 3E550 1 3 / r BLOCK H LOT H3 ' 4,4005E 3 EFFE 0 U. a• — — ` CSAN, LATERAL M t �+� swrvsMR 3 FORE3 MMN ERA EEA EMENTl ' LOT H< AC 1 V f 50795F 5>.77 FFEE .W ! 1 34. Sheet 36: Provide yard drains for drainage across 3 or more lots (ref" design at Lots J-12 thru J-14). Ref. Drainage Plan checklist. Examine all grading /utility plan sheets; provide yard drains with plan / rp ofile data including invert in/out, rim, and profile: diameter, length, slope, etc. Provide drainage computations /tables —consider spread, Qio capacity. Note: Min. pipe diameter is 12". Link: http://www.albemarle.or¢Lupload/ima2es/forms_center/departments/CommunityDevelopment/forms/Engineering and WPO Forms/Engineering Review Drainage Plans Checklist 1Dec2014.pdf Also: Provide yard drains at: Lots I-32 thru I-36 (sheets 28/32); I-48 thru I-57 (back yards, sheet 29); J-39 thru J-44 (front Yards, sheets 33/35). -` 5A 5F / ma / / �� e La i sum �•:ib�ws�o .:;A ' A. a'em}aFE EMGGOD 1 VTVAL V . / 35. Sheet 37: Revise proposed grades that intersect porches, walks, etc., unless intentional —image, below. (Review all sheets.) Engineering Review Comments Page 6 of 9 354M 354.Op� l f X LOT J-27 LOT J-20 8,788 SF 5IB'lllA7E3METER � _ } - 5,933 SF } (Wm). TVP. -LOT J-22 } -� V WPEKOOPPER ` — -" ITF.i2.gF7ff..7yp,� \ 4,902 S`r FFE 30bO EEE Y.'2. L T J 2S 5,400 5� I � _ r� ,OO 1100 ]T J-24- — 3 r ` 1 DO \ � i 45'BEND 36. Sheet 37: Provide Auto -turn diagrams that show a 211d vehicle may park next to an already -parked vehicle: Lots J-20, -21, -22. Revise design to ensure two vehicles may enter /exit and park in space fronting dwellings (this sheet, and elsewhere). * Note: Albemarle has received complaint concerning negative experience based on unrealistic design driveway access, similar to proposed. Provide Auto -turn figure for any lot where design configuration is similar, oryroblematic. y1} 5 _ — ��9F - } � i07 b25 1 6 40T J-284AOO SF- } TYP.V 4.4005F FFE �, �fFPdOJ.W 71111, w w OVA i - - 1,, 37. Sheet 37: Proposed Entrance, Lot J-20 does not work; revise such that a car may enter /exit without exceptional maneuvers, without dropping off curb. Albemarle has received severe complaint post - construction relating to misalignment of apron and driveway edge. Propose alignment similar to blue line. Examine all entrance aprons /all sheets, especially in cul-de-sacs and curves (sheet 36, Lots J-1, J2, for example). Revise as necessary. Engineering Review Comments Page 7 of 9 y✓ / o L 36+40 W 36*00 ♦ / � 45' BEND \ tv I G.V. / IZ FHA #X5 38. Sheet 37: Provide off -site temporary construction easements required to grade to adjacent property lines. Image, below —examine and provide remedy for similar proposed grading to property line. (Mossy Rock Rd. cul-de-sac, for example —sheet 35) � _ r 0 I v� as•ego 1 II 1 I I I �Ac��EME� - � 7 T, TMP l I I II/ 16E7�TYMcVL4 � NAN ` � RE5f6€IJTIAL I i I 39. Sheet 40: Sanitary Sewer Aerial Crossing —provide a Floodplain Development Permit Application to address requirements of Code 18-30.3 if development is proposed in FEMA Zone A /AE floodplain. Engineering Review Comments Page 8 of 9 350 AERIAL CROSSING OF CREEK& FLOODPLAIN" WITH 8' GRIFFIN LONG SPRN DIP SUPPORTED WITH 18'0 REINFORECED CONCRETE SONOTUBE PIERS340 STAINLESS ABLE ESS STEEL STANCHION SADDLES - - - - 330 --- - - STAINLESS STEEL STANCHION SADDLE SPECIFICATION MANUFACTURER' FM STAINLESS, LLC - (7O6) 03 1881 320 rEM #: SBC-B MATEWAL; 3p41316 STAINLESS STEEL ORDERING: SPECIFY BY PIPE, FIGURE NUMBER, DISTANCE TO CENTER OF CONCRETE 10+00 11+00 12+00 SANITARY SEWER 'B' PROFILE; STA. 10+00 - 16+60 SCALE: 1'-2D' H: 111 TV 40. Sheet 63: Revise d/h column values, Inlets in Sump. 41. Sheets 64-68: Label each pipe. Provide pipe structure numbers. 42. Sheets 64-68: Engineering strongly recommends that storm sewer pipe in fill sections be RCP. Any HDPE or RCP pipe with As -built slope < 0.5% will be rejected by Albemarle, and will need to be replaced at Owner's expense. Note, for example: a. `2F' profile: i. 114.54 LF of 15" HDPE @ 1.75% (placed on 5' fill). ii. 40.86 LF of 15" HDPE @ 0.88% (placed on 3' fill). b. `2G' Profile: 50.94 LF of 15" HDPE @ 1.75% (4-5' fill). c. `2H' Profile: Recommend revise grade of 38.84 LF of 15" HDPE @ 0.51%. d. `2P' Profile: 82.23 LF of 15" HDPE @ 0.91%. e. `2Q' Profile: 82.46 LF of 18" HDPE @ 0.73% f. `2M' profile: i. 144.84 LF of 24" HDPE @ 2.74%. ii. 52.22 LF of 24" HDPE @ 3.03%. iii. 31.84 LF of 24" HDPE @ 0.94%. iv. 50.08 LF of 15" HDPE @ 5.73%. g. `2S' profile: 164.95 LF of 15" HDPE @ 1.81% (5-6' fill). 43. Sheet 67: Str. SD 2S3, 2S4 (height str. >12') -provide label and detail for VDOT SL-1 (safety slab). 44. Sheet 67: Revise structure label SD S24 to read 2S4. 45. Sheet 68: Provide box culvert endwalls based on VDOT standards. Provide VDOT Std. for Modular Block retaining wall as EW, if such exists. Show VDOT Std. EW on plans. Provide and show Wing Wall Std. on plans. Ref. profile of proposed box culverts at Lazy Branch Ln Sta. 31+63 and 26+40. 46. Sheet 68: Specify minimum slope of each proposed box culvert. Albemarle recognizes need for invert elevations to be adjusted per verification of stream inverts. 47. Provide Note stating: "All fill material supporting roadways, embankments, and structures within the right-of-way shall consist of Type I Select Material as defined in Section 207 of the 2016 VDOT Road and Bridge Specifications and must be placed in successive uniform lifts not exceeding 8" and compacted to 95% of the soil's maximum dry density as determined by ASTM D698." 48. MH Structures SD 2F2, 2F3, 2G2, 2K2, 2L2, 2M9, 2M10, 2M11, 2M12, 2R1-B, 2S-11 are proposed in fill sections and require inspection by qualified personnel reporting to the Engineer that installation is per VDOT specification, item #47. 49. Provide VDOT Std. PB-1, General Notes on plans (107.00; Spec. Ref. 302 /303 -.PDF p. 112 of VDOT on-line CSection100) 50. Provide VDOT Std. PB-1, Pipe Bedding and Backfill, Method `A " on plans (107.01 -p. 113 of CSection100). 51. Provide VDOT Std. PB-1, Pipe Arch Bedding and Backfill on plans (107.03 -p. 115 of CSection100). Engineering Review Comments Page 9 of 9 52. Provide VDOT Std. PB-1, Bedding and Backfill/Box Culverts, Method "A" on plans (107.04 —p. 116 of CSection100). 53. Provide VDOT Std. DS13-1, Bedding for Inlet, MH, and JB on plans (106.15, p. 111 of CSection100). 54. Provide VDOT 2016 VDOT R&B Spec. Note (303.04(g)): (g) Backfilling Openings Made for Structures: Backfill shall be suitable material removed for the structure, although the Engineer may require that backfill material be obtained from a source within the construction limits entirely apart from the structure, or other approved mate- rial. The opening to be backfilled shall be dewatered prior to backfilling. Backfill shall not be placed against or over cast -in -place box culverts or other structures until the top concrete slab section(s) has been in place 14 days, exclusive of days on which the average high -low ambient temperature is below 40 degrees F in the shade or until the concrete control cylinder(s) has at- tained a compressive strength equal to 93 percent of the 28-day minimum design compressive strength. Also: Box culverts shall not be opened to construction equipment traffic until concrete has attained 100 percent of the 28-day design minimum compressive strength and has a backfill cover of at least 4.0 feet. The minimum height of backfill cover required to protect pipe culverts from construction equipment shall be in accordance with Standard Drawing PC-1 for the type and size specified. Please feel free to call if any questions: 434.296-5832 —x3069 Thank you SDP201800031_Rivanna Village Phase 2—block F-G-H-I-J FSP_062618.doc