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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: Montessori Pantops Mountain Community School
Plan preparer: Chris Mantle, Chris Sonne; McKee Carson [301 East High Street,
Charlottesville, VA 22902, cmantle(&mckeecarson.com;
csonnegmckeecarson.com]
Owner or rep.: Montessori Community School of Charlottesville [440 Pinnacle Place,
Charlottesville VA 22911 wfisher gmountaintopmontessori.org]
Plan received date: 16 April 2014
Date of comments: 05 May 2014
Reviewer: John Anderson
A. Stormwater Management and Mitigation Plan (WP0201400032)
1. Separate out the WPO plans. They cannot be approved as part of a site plan set.
2. These plans should include BMP /s for phase 1 that reflect ultimate build -out. With change to
Master Plan and prior applications that eliminate certain features (bio- filters, cistern, swale), it is
important that SWM design reflect overall development plans. May 1, we met to discuss need to
retain semblance of biological treatment since bio- filters were incorporated (as exhibit drawings)
in the 2009 special permit. Since bio - filters and a cistern were elements of prior design, please
ensure that water quality requirements are met using proposed rain gardens, or another approach.
Please furnish details that demonstrate that phase 1 SWM meets quality and quantity requirements.
Compare pre- and post - development impervious areas; show that selected SWM BMP /s meet
required (pollutant) removal rates.
3. Water Quantity: Please demonstrate compliance with AC Code 17 -314, Control ofPeakRate and
Velocity of Runoff.
4. Furnish profiles for new sanitary sewer and storm drain lines. Furnish pipe and inlet computations
for existing lines or inlets that receive additional flow, including capacity and spread calculations
for inlets on Rolkin Road that receive increased runoff with change from gravel to asphalt parking
surface. Consider IN -A2 to MH -B 1, and discharge through this line. Ensure that discarded design
profiles (IN -1 to IN -2 to MH -3, for example) and labels (MH -3, OF -3, for example) are removed
from sheet 7. Show plan/profile and furnish computational details for the parking lot rain garden
island if this is a SWM structure. How will runoff reach the parking lot rain garden? Ensure that
labels and notes on sheet 16 are readable scale (font pitch).
5. 2014, Stormwater Narrative -Additional Stormwater Measures (sheet 15) relate to temporary
ESC, not permanent SWM measures — revise /furnish Stormwater Narrative - Stormwater
Measures for Phase 1. This is critical.
Engineering Review Comments
Page 2 of 2
B. Erosion Control Plan (WPO201400032)
1. Separate out the WPO plans. They cannot be approved as part of a site plan set.
2. Provide clear limits of disturbance, including areas near amphitheater and geodesic dome if these
areas will be graded.
3. Provide perimeter controls that include utility demolition and installation of new sanitary sewer
line. The sediment trap is upslope of utility work and appears to release to a steep slope. There is
potential for sediment trap discharge to wash across the sidewalk and onto Rolkin Road. Consider
measures that limit this potential. Please clearly delineate sidewalks at Rolkin and Richmond
Roads.
4. Furnish safety fence to prevent incidental trespass. None is shown. All controls must be shown
and detailed on the plan, and within the limits of disturbance.
Indicate access (vehicle travel path) to stockpile area, sheet 3. Stockpile area needs a construction
entrance. Also, there is an apparent conflict between the construction entrance and storm drain
line from IN -A2 to MH -B 1 (sheet 5).
6. Furnish sediment trap details and dimensions (profile, perspective, cross section of outlet)
sufficient to evaluate against VESCH; see Plate 3.13 -2 (VESCH) — ST floor length and width,
especially.
C. Road plans
IM.11
D. Site Plan (SDP201400032)
Parking: Increase parking lot rain garden island radius from 1.8 -ft to 3 -ft, minimum. Lengthen curb (bulb -
out) at parking lot entrance so that parking space at entrance is bordered by 18 -ft length of curb, minimum.
E. Final Plat
NA
File: WPO201400032- Montessori - Memo - 050514