HomeMy WebLinkAboutSDP202000058 Review Comments Major Amendment, Final Site Plan 2020-12-23� 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
Project:
Plan preparer:
Owner or rep.
Plan received date:
(Rev. 1)
Date of comments:
(Rev. 1)
Reviewer:
Project Coordinator:
SDP2020-00058
Site Plan review
Crozet Elementary School Addition, Renovation and Site Improvements - Maj
Kim Mellon /Timmons Group [ kim.mellon(a),timmons.com ]
Bryan Cichocki, PE, bryan.cichocki(a),timmons.com
608 Preston Ave., Suite 200 / Charlottesville, VA 22903
Albemarle School Board, Arm. Superintendent
COB, 401 McIntire Road, Charlottesville, VA 22902
Matt Wertman, Sr. Project Manager, FES /FPC
mwertman("bemarle. or¢
19 Aug 2020
2 Dec 2020
21 Sept 2020
23 Dec 2020
John Anderson
Andy Reitelbach
Note: If text grayscale, then comment is either addressed, or withdrawn.
1. C0.0: Revise plan title to include SDP202000058.
2. CO. 1, Note 4: Revise FEMA FIRM effective from Feb. 4, 2005 to May 16, 2016, per code [ 18-30.3.2.].
httpa:Hlibrary.municode.com/va/albemarle county/codes/code of ordinances?nodeld=COALCOVI CHI8ZO
ARTIIIDIRE S30OVDI S30.3FLHAOVDIH. S30.3.2FLINRAMAFLINST
3. CL3: Provide VDOT IS-1, PB-1, ST-1 details (inlet shaping, pipe bedding, MH steps). (Rev. 1) Persists;
not addressed. Details not shown on C 1.3. please direct to sheet # with these details, if overlooked.
C4.0:
4. Show permeable paver underdrain connections with pipes /DIs /UG detention in C7.0, C7.1, wherever
these occur. (Rev. 1) NA Applicant response (11/25/20 letter): `Permeable pavers are no longer being
proposed with this project.'
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. (Rev. 1)
Withdrawn. Applicant response (11/25/20 letter): `The plan has been further improved to reduce work
within the WPO buffer as one of the two bioretention areas has been removed. The replanting area is
mitigation for the work within the WPO buffer and should have a nexus and proportionality to the impact.
It is an undue burden to this project to request the whole buffer be replanted especially in areas where there
is no impact to the existing WPO buffer.' In withdrawinz. please consider:
a. Engineering agrees with Applicant response, partially.
b. Final site plan for Crozet Elementary School, SDP1989-00031 VMDO, 3/28/89, administratively
signed, 5/25/89, shows stream buffer canopy vegetation along Parrott Branch at approximately the
same locations and to same (horizontal) extent as is visible in 2020, some thirty-one years later.
Engineering Review Comments
Page 2 of 5
c. Stream buffer historical (foot)note earliest code ref. date (Sec. 17-600 Extent ofstream buffers;
retention and establishment) appears to be 6-19-91 which is after Crozet Elementary Final Site
Plan was administratively signed.
d. At no point over the past thirty -plus years have ordinance or modifications to Crozet Elementary
triggered a request for wholesale plantings within defined limits of the stream buffer (which may
not have existed at the time Crozet Elementary School final site plan was administratively signed).
e. Establishment of buffer vegetation (17-604.C.5) stipulates 2:1 offset plantings within unvegetated
portions of a stream buffer. If intent of ordinance is for any applicant of any application on any
parcel with stream buffer, even sections of buffer unaffected by or distant from development, to
establish plantings throughout the entire unvegetated reach of buffer, there would be need to
calculate a 2:1 offset, or to estimate quantities of plants required to achieve 2:1 offset plantings.
Rather, ordinance would simply state requirement that mitigation requires buffer plantings
throughout the entire unvegetated extent of an on -site stream buffer. Reviewer comment is
inconsistent with ordinance 2:1 stream buffer mitigation planting requirement. See 17-604.C.5.
f. The WPO stream buffer ordinance appears not to recognize concepts of nexus or undue burden,
but recognizes proportionality via 2:1 mitigation planting requirement, which is the standard
typically applied to (virtually) all applications.
g. For these reasons, review comment oversteps and is withdrawn.
C4.1
7. Note 1. Ensure Arch/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. (Rev. 1) Addressed. Applicant: `We have coordinated with the MEP
and Architect and the above ground temporary oil fuel tank will have a containment tray/pan at the base to
mitigate any spills and/or leaks. The tank with the containment tray the MEP specs will look something
like this:
8. Reviev, ay 2C, 4_I v. biofzher #3, C1.2. (Rev. 1)
NA. Applicant: `Detail has been removed from Sheet C 1.2, as the water feature has been removed from the
project.'
9. (Related), C1.2: Curb cut & biofrlter 43 waterfeature 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 biofilter 43. Provide C4.1 plan view ref, label to this handrail detail.
(Rev. 1) NA. Applicant: `Water feature has been removed from project.'
C5.0
10. Revise structure label for structure between storm pipes 139A and 139B from 139B to 138B. (Rev. 1)
Partially addressed. As follow-up: Please avoid duplicate `139B' structure labels. See image, below:
Engineering Review Comments
Page 3 of 5
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. (Rev. 1) Addressed. Applicant:
`Culvert computations have been provided on sheet C7.2 for pipes 501 and 505. Both have been decreased
in size to a 15" which is more than adequate.'
STR 504 - STR 506
STR 500 - STR 502
12. C5.1: Compare plan view of pipes 303, 305 on C5.1 with C7.1 Storm Sewer Profile 5 [
images removed with Rev. 1 comments ].
a. Provide sufficient cover for pipe 303 its entire length. Crown of pipe is exposed in profile view.
Engineering Review Comments
Page 4 of 5
b. Provide fine grade lines and spot elevations at Str. 304 to ensure runoff capture at this location.
(Rev. 1) Addressed. Applicant: `Fine grade lines and a spot elevation have been provided for Str.
304. However, all Nyloplasts in the 300 series are solid covers, so runoff capture is not the
intention at this point.'
c. Show and label 4" solid HOPE 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 (Str. 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, (Rev. 1) Withdrawn. Applicant: `It is not very practical to place a structure
at this location on the curve of the curb line and so close to the sanitary sewer easement. This curb ramp
does not serve any accessible parking spaces and is provided as a convenience for wheeling anything into
the rear entrance.' Engineering accepts this position.
14. General (VSMP-related)7 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
accord with WPO202000039 plan. The VSMP plan will likely include similar note, requiring contributing
drainage area stabilization prior to biofilter construction. (Rev. 1) Addressed. Applicant: `A note has been
provided as recommended on Sheets C4.0 and C4.1.'
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 C 1.1 detail to supplement outdoor basketball court layout may eliminate
need for trench drain if 5' chain link fence detail is included and shows —6" 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. (Rev. 1) Addressed. Applicant; `The grading of the basketball
court has been revised to provide more slope (see Sheet C5.1). Additionally, the chain link fence has been
removed. Therefore, we do not believe an additional trench drain is needed in this location.'
16. CLI:
a. Outdoor basketball court layout: Revise court gates, consistent with C4.1 plan view, where gates
open onto asphalt walk. (Rev. 1) NA. Applicant: `Gates have been eliminated from the plan.'
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. (Rev. 1) NA.
Applicant: `Chain link fence has been removed from the plan, detail has been revised accordingly
on Sheet C 1. V
c. Recommend light duty asphalt pavement section spr f\- % slope to ensure adequate drainage
from basketball court, across walk. (Rev. 1) Addressed. Applicant: `Basketball court grading has
been revised to increase slope and ensure adequate drainage. Slope labels have been added to
Sheet C5. V
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). (Rev. 1) Partially addressed. As follow-up: Please
avoid duplicate `139B' structure labels in storm sewer profile. See image, below:
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Engineering Review Comments
Page 5 of 5
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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 elevation/s 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. (Rev. 1)
Addressed. Applicant: `Due to stormwater changes, this structure is no longer proposed with this project.'
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. (Rev. 1) Addressed.
21. Note: WPO plan approval is required prior to Major Site Plan Amendment approval (WP0202000039 has
been submitted, review pending). (Rev. 1) Comment persists. Please ensure site plan amendment is
consistent with WPO plan, and most -recent 17-Dec 2020 Engineering WPO plan review comments.
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 122320rev1