HomeMy WebLinkAboutSDP202000058 Review Comments Major Amendment, Final Site Plan 2020-09-21� AI
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COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road, Room 227
Charlottesville, Virginia 229024596
Phone (434) 296-5832 Fax (434) 972-4126
Site Plan review
Project:
Crozet Elementary School Addition, Renovation and Site Improvements - Maj
Plan preparer:
Kim Mellon /Timmons Group [ kim.mellon(a),timmons.com ]
608 Preston Ave., Suite 200 / Charlottesville, VA 22903
Owner or rep.:
Albemarle School Board, Arm. Superintendent
COB, 401 McIntire Road, Charlottesville, VA 22902
Matt Wertman, Sr. Project Manager, FES /FPC
mwertman("bemarle. org
Plan received date:
19 Aug 2020
Date of comments:
21 Sept 2020
Reviewer:
John Anderson
Project Coordinator: Andy Reitelbach
SDP2020-00058
1. C0.0: Revise plan title to include SDP202000058.
2. C0.1, Note 4: Revise FEMA FIRM effective from Feb. 4, 2005 to May 16, 2016, per code[ 18-30.3.2.].
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3. C1.3: Provide VDOT IS-1, PB-1, ST-1 details (inlet shaping, pipe bedding, MH steps).
C4.0:
4. Show permeable paver underdrain connections with pipes /DIs /UG detention in C7.0. C7.1, wherever
these occur.
5. Label narrowest width dimension typical of 7 curvilinear parking spaces.
6. With project, re-establish buffer with suitable native species (plantings) in areas that are currently managed
turf. See 17-600, 17-604.A. Note: proposed design is an improvement over existing managed turf, and
over earlier versions of design that showed impervious improvements in the stream buffer. Proposed
design proposes only biofilters, and only within the landward fifty -feet (50') of the stream buffer.
C4.1
7. Note 1. Ensure Arcb/MEP drawings (these are not reviewed by Engineering) provide temporary external
containment (if required by USBC) for temporary above -ground oil fuel tank during winter months while
construction is ongoing to help mitigate any impact due to accidental loss of oil that, at a school, may go
undetected for hours, or days —relevant during possible extended school closure during winter holiday, or
closure associated with the pandemic.
8. Review /revise plan view label /detail caption. Bioretention facility 2C, 4_1 v. biofilter #3, C 1.2.
9. (Related). C 1.2: Curb cut & biofrlter 43 water feature section includes label reading `exterior stairs without
handrail.' Intent seems clear, but given C4.1 label /linework that indicate a galvanized handrail is to be
positioned at top of steps (feature), provide galvanized handrail detail (openings <_ 4 in.) to prevent children
crossing this railing at the top of biofrlter #3. Provide C4.1 plan view ref label to this handrail detail.
C5.0
10. Revise structure label for structure between storm pipes 139A and 139B from 139B to 138B.
11. Pipes 5011505 are proposed 18" DIA. An existing pipe between these two pipes at the central -main
entrance is 15" DIA. Revise 15" pipe DIA, if needed, to ensure adequate pipe capacity at this location.
Design typically avoids smaller diameter downstream conveyance.
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STR 504 - STR 506
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Engineering Review Continents
Page 2 of 4
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STR 500 - STR 502
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12. C5.1: Compare plan view of pipes 303, 305 on C5.1 with C7.1 Storm Sewer Profile ( images, below).
a. Provide sufficient cover for pipe 303 its entire length. Crown of pipe is exposed in profile view.
b. Provide fine grade lines and spot elevations at Str. 304 to ensure runoff capture at this location.
c. Show and label 4" solid HDPE that intersects pipe 305, in profile view.
d. Show fine grade lines and spot elevations at other (grate) inlets to ensure runoff is captured.
e. Reposition pipe 303 end section (Sir. 302) to align with pipe. ES is not a flow -redirecting
structure.
13. Provide runoff capture (DI) prior to CG-12 ramp at approx. contour 692.75' in bus loop parking, else ramp
receives concentrated runoff.
Engineering Review Comments
Page 3 of 4
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HORIZ SCALE: 145P
VERT SCALE: 1' 5
14. General (VSMP-related) Recommend Note on Site Plan that bioretention basins may not be constructed
until all contributing drainage areas are stabilized, and that Note also require bioretention construction in
Engineering Review Comments
Page 4 of 4
accord with WPO202000039 plan. The VSMP plan will likely include similar note, requiring contributing
drainage area stabilization prior to biofilter construction.
15. C5.3: Provide trench drain or similar for basketball court to minimize risk of ice on asphalt walk during
winter. Court drains NW to SE. This expanse of impervious area (basketball court) will sheet rain or
snowmelt to an asphalt walk. Proposed grade, 0.5%, is relatively flat. Debris trapped against chain link
serves as a dam to drainage. A C1.1 detail to supplement outdoor basketball court layout may eliminate
need for trench drain if 5' chain link fence detail is included and shows —F gap at the bottom edge to allow
debris to be swept or blown through the gap. Experience with debris dam at chain link fence at Sutherland
MS tennis courts advises this comment.
16. C1.1:
a. Outdoor basketball court layout: Revise court gates, consistent with C4.1 plan view, where gates
open onto asphalt walk.
b. Outdoor basketball court layout: Revise label to read 5' sideline to edge of pavement to read 5'
sideline to chain link fence, since asphalt continues beyond fence, as asphalt walk.
c. Recommend light duty asphalt pavement section specify % slope to ensure adequate drainage
from basketball court, across walk.
17. C5.4:
a. Recommend Note or label to reference WPO202000039.
b. Recommend label each SWM facility `SWM facility.'
C7.0:
18. Revise structure label for structure between storm pipes 139A and 139B from 139B to 138B in profile
captioned UG Detention — Pipe 141 (@Sta. 10+94.99).
19. Str-126 MH-1 with splitter weir: provide small scale plan /profile relevant details, notes, labels, and
elevations for pipe inverts, MH floor, weir elevations such that split flow is discernable, and ladder, weir,
pipe entry /exit conflicts are avoided. Likely submitted with WPO, but also required for site plan.
20. C7.2: Supplement (or replace) storm sewer tables with VDOT LD-204 and LD-229 stormwater inlet and
storm sewer design computations (tables). Additional review comments possible.
21. Note: WPO plan approval is required prior to Major Site Plan Amendment approval ( WPO202000039 has
been submitted, review pending).
Please feel free to call if any questions: 434.296-5832 -x3069
Thank you
I Anderson
SDP2020-00058 Crozet Elem School Addition, Reno, Site Improv MAJ 092120