HomeMy WebLinkAboutSDP200900037 Review Comments Minor Amendment 2009-07-10� OF AL
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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:
Saint Anne's Belfield; Minor Site Plan Amendment [SDP200900037]
Plan preparer:
Mr. Kurt Gloeckner, PE
Owner or rep.:
Saint Anne's Belfield
Plan received date:
7 May 2009
(Rev. 1) 6 July 2009
Date of comments:
9 June 2009
(Rev. 1) 10 July 2009
Reviewer:
Phil Custer
I. (Rev. 1) Comment has been addressed.
2. (Rev. 1) Comment has been noted by the applicant and the noted spot elevation is intentional.
3. (Rev. 1) Comment has been addressed.
4. The County has refined its policy on artificial turf fields. The conversion of the grass to artificial
turf increases the overall imperviousness of the site, so water quality and quantity control is a
concern. Though, after evaluating the existing stormwater system, engineering review believes
that water quantity control is not an issue considering the detention within in the existing
downstream biofilter, underground pipe, and even within the underdrain system of the new field.
However, water quality concerns still exist. The applicant should submit a WPO plan showing
water quality treatment of the runoff from the artificial field. Water quality computations should
be made considering the artificial field as gravel (70% imperviousness).
Alternatively, in lieu of providing treatment within a facility, the applicant may commit to water
quality monitoring of the runoff from the artificial field. The frequency and location of the water
quality sampling should be determined by a qualified individual with experience in water quality
analysis. Results and analysis of the raw data should be provided to the county every three months
after construction of the field for a period of one year.
(Rev. 1) At the suggestion of the applicant, the County will allow the treatment of a percentage
of existing VDOT impervious surfaces in lieu of direct treatment of the artificial turf field.
However, in order to treat this road runoff to the minimum state guidelines, a full biofilter
section (2.5ft) must be provided. Once the following items are addressed, the plan can be
approved:
- Please submit a WPO application and fee ($180) for an amendment to the SWM plan.
- Please update the biofilter detail on Sheet 2.1 to show a 2.5ft section of the "state- approved
biofilter mix" and between 12" & 18" of gravel beneath the soil mix. Please also remove
structure 23 and 8" pipe from the profile.
-The county will accept the adequate percolation rate of the in -situ soil beneath the biofilter, so
an underdrain will not be required. Please remove structure 23, the underdrain pipe, and the
note referring to the underdrain pipe from pages C0.0 and C1.3.
It should also be noted that the applicant is now proposing to direct runoff from turf field into
the irrigation cistern. This will result in some additional treatment of the runoff from the field
during spring and summer months.