HomeMy WebLinkAboutSDP201100084 Review Comments Final Site Plan and Comps. 2012-02-01i"
,. `IRGINZP
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: Westminster Canterbury Monticello Building Expansion
WP0201100105
Plan preparer: Timmons Group [fax 295 -83171
Owner or rep.: Westminster Canterbury of the Blue Ridge [fax 972 -31731
Plan received date: 3 Jan 2012
Date of comments: 1 Feb 2012
Reviewer: Michael Koslow
The Final Site Plans (WP0201100105) submitted 3 January 2012 have received Engineering
Review and do not appear to meet Albemarle County minimum checklist items for approval.
Please adequately address the following comments for final approval:
A. Existing Conditions Information (WP0201100105)
1 Please identify the date of topography.
2. Please identify a benchmark location and elevation for topography. An existing utility or other known
position will suffice.
3. Please be consistent with contour interval labeling (i.e. every 1', 2' or 5'; prefer 2' intervals).
B. Proposed Plan View Information (WP0201100105)
1. Please provide a detail for retaining wall which includes safety railing for retaining walls over 4' high.
2. Please provide unobstructed sight distance lines to demonstrate sight distance > 10' x speed limit from
all entrances measured from a point 10' off the edge of the intersected street.
3. Please revise all entrance radii to minimum of 12.5'
4. Please revise all parking stall widths to 10', a requirement for aisle width < 24'.
5. Please revise all sidewalk widths adjacent to parking to 6'
7. Please provide bumper blocks for parking stalls adjacent to 5' wide sidewalk.
8. Please show flow arrows for all proposed and existing storm sewers.
9. Please label all existing and proposed street names.
10. Please label all curb radii for all proposed entrances and intersections.
11. Please provide dimensions and labels for all pavement markings.
12. Please identify building loading zone and dumpster locations if applicable (or comment if not).
13. Please add "CG -12" label at curb ramp by building.
14. Please extend sidewalk at southwest corner of the sidewalk. Current crosswalk appears to connect to
an existing driveway. Please extend the sidewalk and provide a curb ramp beyond the existing
driveway.
15. Please extend curb at curb ramp at southwest corner of the parking lot to reduce washout of adjacent
earth.
C. Plan Detail Information (WP0201100105)
1. Please provide pavement design calculations.
2. Please provide a detail for all proposed drainage structures crossing all proposed retaining walls.
3. Please provide Albemarle County general construction notes.
Engineering Review Comments
Page 2 of 3
4. Please provide a curb transition detail near Structure #100.
D. Drainage Profiles (WPO201100105)
1. Please provide a VDOT designation for each structure.
2. Please provide a throat length for each drop inlet.
3. Please provide a grate type for each grate inlet.
4. Please provide concrete inlet shaping for any structure with a 4' or greater drop.
5. Please provide end sections or endwalls on all pipe outlets.
E. Drainage Computations (WPO201100105)
1. After Limits of Disturbance are calculated, will need to verify the drainage areas identified in the
drainage computations.
2. Proposed drainage outlets to three independent sources. Please revise computations to reflect areas
draining to Pond, existing bioretention area, and untreated outlet at US -250 drainage ditch.
F. Stormwater Management Plan (WPO201100105)
1. Please provide as -built plans for existing pond and biofilter to be used for stormwater management for
the Monticello Building Expansion.
2. Please provide a proposed drainage map to demonstrate area which drains to the three independent
sources (see Comment E2). Please include the direction the building roof drains outlet with the
drainage map.
F. Stormwater Management Computations (WPO201100105)
1. Please provide computations to demonstrate a better post - development condition for the portion of the
project which drains to US -250 drainage ditch.
2. Please provide computations to demonstrate water quality and detention requirements are met for the
portion of the project which drains to the existing bioretention area.
3. Please revise computations for a reduced area of increased impervious surface which drains to the
existing pond.
G. Erosion and Sediment Control Plan (WPO201100105)
1. Please provide soils descriptions and label soil divides on plans.
2. Please include Albemarle County erosion control notes.
3. Please include Stormwater Runoff Considerations in the Erosion and Sediment Control Narrative
before the Sequence of Installation (see VESCH Checklist for Erosion and Sediment Control Plans p.
VI -13).
4. Culvert inlet protection identified for existing inlet near proposed Structure 100 will be graded over.
A sediment trap will be required near Structure #100. Please also provide sediment trap sizing
calculations. Please call for clarification.
5. Please change the "CIP" label downstream of Structure #100 to "OP" on sheet C5.1 as outlet
protection will be required at the outlet of this existing culvert during construction.
6. Identify staging areas and parking area for contractor.
7. Please label the limits of disturbance encompassing all clearing, grading, entrances, staging and
parking areas, areas where sediment laden runoff will cross, or any construction related activities.
8. Please show location for Construction Office on plan.
9. Please include Dust Control (symbols) for disturbed ground areas.
10. Please include Temporary and Permanent Seeding (symbols) for disturbed ground areas.
11. Please identify existing drainage divides.
12. It appears silt fence is proposed across construction entrance near existing parking lot. Provide
Temporary Right of Way diversion instead.
Engineering Review Comments
Page 3 of 3
13. Show proposed silt fence turned up at ends near proposed garden area (at ends of contour elevation
588 feet).
14. Please show silt fence below wall (recommend 5' — 7' for construction access).
15. Provide temporary diversion dike instead of silt fence where silt fence is proposed south of proposed
parking garage entrances.
16. Block or seal existing inlet and trench drain at east side of existing parking area prior to removal of
existing inlets at parking lot entrance. This will prevent mud/soil from entering the storm sewer
system.
17. Please provide dimensions and stone sizes for outlet protection at Structure #100 shown on sheet C5.2.
18. Show soil stockpile location or note how excavation will be stockpiled during construction.
19. Address public safety during excavation for parking garage (e.g. provide safety fence).
20. "Stormwater inlet protection" detail on sheet C5.0 not recommended. Recommend providing inlet
protection with overflow capabilities (see VESCH Plate 3- 07.8).
Once these comments have been addressed, please submit 2 copies of the revised plans, calculations, and
narratives to Community Development Engineering along with the required review fee and transmittal
form.
Community Development Engineering is available from 2:30 -4 PM on Thursdays to discuss these review
comments. Please contact Michael Koslow at 434 - 296 -5832 ext. 3297 or email mkoslow @albemarle.org
to schedule an appointment.
[17- 204.f] An application for an erosion and sediment control plan that requires modifications, terms, or conditions to be
included in order for it to be approved shall be deemed to be withdrawn if the owner fails to submit a revised plan addressing the
omitted modifications, terms or conditions within six (6) months after the owner is informed of the omitted information as
provided under paragraph (B).
File: