HomeMy WebLinkAboutWPO200600082 Review Comments Stormwater Management Plan 2010-01-27ALg�,��
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COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road
Charlottesville, Virginia 22902 -4596
Phone (434) 296 -5832 Fax (434) 972 -4126
Project: Westminster Canterbury Biofilter Amendment
(SDP- 2010 -00002 and WPO- 2006 - 00082)
Plan preparer: Mr. Kurt Gloeckner, Gloeckner Engineering and Surveying Inc.
Owner or rep.: Mr. Roy Whitlock
Date received: 11 January 2010 (plan dated 4 January 20 10)
Date of Comment: 27 January 2010
Lead Reviewer: Phil Custer, Civil Engineer
The minor site plan and SWM amendments for the Westminster Canterbury biofilter, received on 11
January 2010, have been reviewed. The plan can be approved after the following comments have been
addressed.
1. The professional seal on the plans must be signed and dated. (18- 32.6.1)
2. Please remove the 5 notes in the upper right corner of the drawing. They are no longer applicable.
3. The reason for the amendments must be specified on the plan. Please provide the following note:
The purpose of this sheet is to amend the previously approved site plan (SDP- 2006 - 00159) and
stormwater management plan (WPO- 2006 - 00082) by adding a biofilter facility at the base of
the eastern slope of the property which will bring the site into compliance with the Water
Protection Ordinance. All stormwater management requirements for this property will be
covered by the 754sgft biofilter shown in this plan. The rain gardens proposed in previous
plans will become solely ornamental.
Please also bubble all areas of the plan being modified with this amendment.
4. Please show riprap (minimum 3" diameter) over all slopes shown at 1.5:1 or propose a small wall.
(The slope between 554 and 550 measures at 1.5:1.)
5. In the sod note in the lower left corner of the sheet, please add the following sentence: THE SOD
SHALL NOT BE PLACE ON TOP OF THE BIOMIX.
6. At the end of the tree protection note to the left of the biofilter cross section detail, please add the
following sentence: HOWEVER, NO TREE OR SHRUB SHALL BE PLANTED ON THE
BIOFILTER EMBANKMENT.
7. Please remove the two "1 %" notations in the plan view detail of the biofilter at the top of the page.
8. Please create a small sediment forebay at the north end of the biofilter by proposing a 9" tall rock
weir at the north end of the spillway.
9. The planting plan for the biofilter must be modified. Because of the bed, a total of 8 plants are
required. To keep with the ratio outlined in the VSMH, 6 of these plantings should be shrubs and
2 should be trees. Two species of trees and at least 3 species of shrub (a maximum of 2 plantings
per species) must be installed.
10. Note 2 at the center top of the sheet must read: PROVIDE 1.0' PONDING DEPTH WITHIN
THE BIOFILTER BY INSTALLING AN ARMORED SPILLWAY AT THE 551 ELEVATION
THAT OUTFALLS INTO THE EXISTING CHANNEL.
11. A revised SWM bond will not be required because the cost of construction is roughly
equivalent to the previously approved plan.