HomeMy WebLinkAboutSUB201500159 Review Comments Road Plan and Comps. 2015-10-21�pF A
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COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road, Room 227
Charlottesville, Virginia 22902 -4596
Phone (434) 296 -5832 Fax (434) 972 -4126
Project: Wintergreen Farm, ROAD Plans
Project File Number: SUB201500159
Plan preparer: Scott Collins; Collins Engineering [200 Garrett St., Suite K, Charlottesville, VA
22902, scott(a)collins -en in�g com, adam(cDcollins- engineering.com ]
Owner or rep.: Alan Taylor, Riverbend Development [455 2nd Street, Charlottesville, VA 22902 —
alan(&riverbenddev. com]
Owner: Wintergreen Farm Land Trust, 600 Peter Jefferson Parkway #130
Charlottesville, VA 22911
Plan received date: 14 Sep 2015
Date of comments: 21 Oct 2015
Reviewer: John Anderson
Major comments include sanitary sewer (utility) alignment, retaining wall, sight distance concerns.
A meeting has been scheduled to discuss comments /concerns 21 -Oct, 2:00 pm.
A. Road Plan (SUB201500159)
1. Title pg. — Recommend include Project File # in title: SUB201500159
2. Sheet 2 — Please note location of existing 8" sanitary sewer, Rhett Court, and 0.668 Ac. parcel (Nguyen).
3. Sheet 2 —As with preliminary plat, please show rural area/development area boundary.
Sheet 3
4. Include Lot 63 with Phase 1 since Phase 1 MH -11 is on this lot (see sheet 5).
5. Revise retaining wall. Shift retaining walls north to provide adequate sight lines and increase distance to
street trees. Recommend place a portion of Open Space at bottom rather than top of retaining walls.
6. Please label SWM Facilities `A', `B', `C'.
7. Provide ROAD Plan phase plan showing temporary cul -de -sac turnaround designs (ACDSM, F. Street
Standards, cul -de -sac detail/graphic, p. 20).
8. Sheet 4/5 — Sanitary sewer design: Avoid stream buffers, preserved steep slopes, and floodplain. A meeting
has been scheduled to discuss utility design. While ACSA approves utility designs, Albemarle County must
evaluate proposed location against ordinance requirements. Proposed location is generally problematic.
Sheet 4
9. Shift retaining walls (near intersection Hallam Street and Maroon Creek Court) north to provide adequate
sight distance. Left turn movement, Maroon Creek Ct. onto Hallam Street, lacks sufficient sight distance.
10. Show sanitary laterals, Lots 7, 8, 9, 14.
11. Galena St. —Label Parking this side only north of intersection with Cooper Court works. Please review to
ensure Parking this side only signs are placed on the outside of horizontal curves. For example, south of
Cooper Court, this means No parking on the east side of Galena St. Parked cars on inside of curves
obstruct sight distance.
12. Provide curb radius labels at intersection of Owl Creek Court and Ridgetop Drive.
13. Provide traffic control signs. Provide No parking signs to guide review.
14. Provide street name signs and curb ramp labels.
15
16
17
18
Engineering Review Comments
Page 2 of 5
If sanitary sewer design is forced to occupy stream buffers, design must still avoid preserved steep slopes.
Ordinance prohibits. Ref. Preliminary Plat.
Sanitary sewer alignment may not impact or affect SWM `A' design. Recommend align sanitary sewer
southwest of SWM `A'.
Note: Avoidable stream buffer, floodplain, and preserved steep /critical slope impacts cannot be approved.
Show /shade preserved steep /critical slopes on Turnstone Drive /elsewhere. Label steep /critical slopes.
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19. Show rural /development area boundary.
Sheet 5
20. Revise `Parking this side only' label to west side of Hallam Street north of Maroon Creek Ct. Also, 411.
21. Provide Easement Table. Ref. ACDSM, 6.A. -p. 15. Review and include proposed 10' private sanitary
sewer easement/s, Lot 34 and elsewhere.
22. Show sanitary lateral, Lots 45 and 64.
23. Label radius horizontal curve, Bleeker St. (PC 11 +18.11)
24. Provide private sanitary sewer easement on Lot 54 required for Lot 43 to connect with sanitary system.
Sheet 6
25. Show /label MH 30, pipe structure #31.
26. Revise sheet title to Grading and Drainage Plan.
27. ACDSM 8.A.2. Slopes >3:1 require vegetative stabilization hardier than grass; mulch is ineligible cover.
Please delete `Proposed mulch ground cover for stabilization of the [2:1 ] slope' at SWM Area `A'.
28. Label pipe structure #149.
29. Evaluate storm inlet design from Sunset Avenue Extended to Hallam Street against 25 -yr storm event. Ref.
Drainage plan review checklist.
30. Furnish additional existing /proposed contour labels, this /other sheets.
31. Recommend relocate storm MH -44 outside cul -de -sac. MH in travel lanes do not match 2% cross -slope
(may catch snow plow blade; less problematic at this location, but space is available outside cul -de -sac).
Sheet 7
32. Owl Creek Ct. inset —Sta. 10 +00 is confusing. Clarify.
33. Owl Creek Ct. inset — Clarify /show Access to SWM Area `B'.
34. SWM Area `C' inset—
a. With ROAD or VSMP, show Access /temp. stream crossing required to construct SWM Facility
b. Label stream
c. Label stream buffer
d. Use ACSA pump station (property) to access SWM facility if possible
Engineering Review Comments
Page 3 of 5
e. Avoid stream crossings and stream buffer impacts to maximum extent
f. Show, estimate Area impact of unavoidable impacts, this /other sheets
g. Mitigate stream buffer impacts with VSMP Application
35. Provide Additional storm inlet structures: Ditch 1, Elev. 518.5' (Sta. 3 +40f), w/berm backing; Ditch 2,
Elev. 522' (Sta. 6 +50f). Ref. Drainage Plan Review checklist: "Dense development where fencing,
decking, etc is expected should provide yard inlets and pipes in easements, rather than ditches f Policy }"
36. West of Hallam St. —Label stream buffer. As elsewhere, estimate /provide mitigation for buffer impact
associated with storm drain or sanitary facilities.
Sheet 8
37. All road profiles, provide cross drain locations shown and labeled with VDOT designations (CD -1,2) at
every major cut and fill transition or sag curves.
38. All road profiles: Add labels for End Construction, End Cul -de -Sac. Reference intersected street CL or EP.
Maroon Creek Ct. for example, shows crown at intersection with Hallam St. Cooper Ct. intersection with
Galena is unclear. Please add labels to profiles that clarify whether streets end at EP or CL.
39. Note 4: Please check note for logic — phrase "In the event that the surface course is applied prior to 60 days,
the pugmill requirement will apply," might instead be intended to apply the requirement if more than 60
days elapse. Also, please revise if necessary `surface course' (note 4) to reference `intermediate course.'
40. Pavement Design, SSV, E of US Rt. 29 =4. Revision not required.
41. Sheet 9 — Sunset Avenue Extended. If RWSA/ACSA sanitary sewer line exists within RW, please show.
Ref. sanitary sewer crossing, Sta. 18 +65f, 11.7' below existing 18" DI waterline.
Sheet 11
42. At top of stepped wall (upper wall), provide drainage ditch to direct runoff away from top off wall, not over
it. Runoff conveyance ditch should connect with street storm collection system. Evaluate ditch against Qto•
43. Retaininjz Wall — Provide geotechnical design, similar to Briarwood Commercial Lot Road Plan.
Recommend grade areas between stepped walls flatter than 3:1. Provide safety railing for wall height >48 ".
Retaining wall plan review checklist is available.
44. Revise Wall section Map (sight distance comments, elsewhere).
45. Correlate wall stationing with road stationing, Hallam Street —see Briarwood Commercial Lot Road Plan.
Sheets 13, 14, 15 Drainage profiles
46. Provide safety slab labels in profile view for structures >12'. A note is easily overlooked. (Str. 4, 30, 56,
54, 152). —That is, please show /label safety slab (schematically) inside structures requiring safety slab.
47. Safety slab, MH 30, does not work with 36" DIA pipe #31 —ref. VDOT SL -1 Detail, Note 1. Revise design:
NOTES=
1. THE STANDARD SAFETY SLAB (SL -1) 19 TO BE USED ONLY WHEN SPECIFIED IN THE PLANS
ON THE DRAINAGE SOMMARY SHEET ANDJOR THE DRAINAGE DESCRIPTION, FOR MANHOLES.
JUNCTION BOXES, AND DROP INLETS WITH HEIGHTS GREATER THAN 12 FEET. THE SPACING Of
ADJACENT SAFETY SLABS SMALL BE 8'70 12' WITH NO SAFETY SLAB LOCATED WITHIN 6 FEET
OF THE TOP OR BOTTOM OF THE STRUCTURE. SAFETY SLABS SHALL NOT BE LOCATED BELOW
ANY INLET PIPE OF 30^ DIAMETER OR GREATER.
48. Profiles: Str -40, -42, -66, -68, -86, -96, -108, -110: Provide Note consistent with VDOT comment (12.) on
unrelated project design —Add quoted "text" for storm drain inlet/1\4H structures proposed in fill:
12. There should be a noted added to the storm sewer profiles indicating that "Contractor shall place fill under
inlet(s) at 95% compaction & embankment material shall consist predominantly of sail & he placed in
successive uniform layers not more than 8" in thickness before compaction in accordance w. VDOT 2047
Road &, Bridge Specification 303.04. After 3' vertical placement of fill, contractor shall excavate recently
laid fill and install compacted VDOT std. 2 LA stone in an Vxg' o.c. compacted 2 LA area centered on the
inlel(s). Contractor shall repeat this operation until an 8'x8' o.c. compacted 21A scone base in installed
between the exisling ground and the proposed inlet(s) base in efforts to reduce the risk of settling.
Contractor shall provide VDOT w' Fill compaction results prior to road acceptance."
49. Str -4, sheet 13: List /provide top elevation; Drainage description table lists as 518.29', but profile does not
match. List top elevation. Ensure profile and drainage description table rim Elev. are consistent.
50. Recommend revise pipe #151 slope to 0.54% or higher. Min. slope = 0.50 %. If As -built condition is
<0.50% for a 306.79' L (any) pipe, it may prove problematic (bond inspection).
51. Sheet 16 —Vel. =2.6 fps between point 186 and 184 < 3 fps. Revise design. (ACDSM 6.A. 1.d.4).
52. Sheet 17 — Spread (4 ") cannot be evaluated. Provide street typical sections and No Parking signs to indicate
which side eligible for parking, so possible to evaluate spread against travel lane width.
Engineering Review Comments
Page 4 of 5
53. Sheet 18 —Ditch 1, Ditch 2: Provide additional storm inlet structures. —Also, item #35, above.
54. Sheet 18/Ditch 5 —Specify jute ditch lining, entire ditch, since grass portion is entirely in fill.
55. Sheets 19, 20, 21 —Specify safety slab for MH structures >12'. MH Str. #3, 10, 12, 13, 14, 16, 25, 26, 31,
33, 103, 104, 105, etc. —Also, see item #46, above.
56. Sheet 22 —Provide VDOT inlet shaping, safety slab typical details.
57. Sheet 25 —Provide barrier or landscaping to limit incidental trespass between sections of retaining wall.
GIS: preserved steep/critical slopes, 100- year floodplain, water protection ordinance buffers
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Engineering Review Comments
Page 5 of 5
434.296 -5832 -0096
Thank you
File: SUB201500159_Wintergreen Farm—RP-102115