HomeMy WebLinkAboutSDP200800061 Review Comments Critical Slope Waiver 2009-04-23�'IRGI1�1�
COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road
Charlottesville, Virginia 22902 -4596
Phone (434) 296 -5832 Fax (434) 972 -4126
To: Summer Frederick, Senior Planner
From: Amy Pflaum, Engineer
Subject: SDP200800061, Earlysville Business Park, Critical Slope Waiver Request
Date received: 14 April 2009
Date of Comment: 23 April 2009
The request for a waiver to develop on areas of critical slope for grading incorporated with the new construction
proposed on TMP 31 -21A was received on 14 April 2009. The existing critical slopes and proposed grading are
shown on the Final Site Plan dated 30 March 2009.
The engineering analysis of the request follows:
Description of critical slope area and proposed disturbance:
The critical slope areas within TMP 31 -21A appear to contain both natural and man -made slopes. The
critical slopes are in partially in areas of embankments that were most likely created when the existing
building on the parcel was constructed. There are also areas that appear to be stockpiles of soils and
debris. The presumably natural critical slopes are small, scattered areas on the perimeter of the site.
The critical slope disturbance is in the form of grading required for the construction of a new building
and the accompanying septic field.
Areas
Acres
Total site area
26.8 acre parcel
Area of critical slopes
4.0
15% of parcel
Total critical slopes disturbed
0.8
20% of critical slopes
Below, each of the concerns of Zoning Ordinance section 18 -4.2 is addressed:
"rapid and/or large scale movement of soil and rock ": Areas of critical slopes on this site
are small and scattered, and most disturbance involves "cleaning up" existing debris piles.
Large scale movement of soil and rock is not anticipated to occur as a result of this
construction.
2. "excessive stormwater run - off ": The applicant has submitted a Stormwater Management
Plan which is being reviewed for County compliance. Stormwater facilities are being
proposed to control the drainage generated by this site through above ground detention and
proper conveyance systems. Excessive stormwater runoff is not expected as a result of
disturbance of these critical slopes.
3. "siltation of natural and man -made bodies of water ": The applicant has submitted an
Erosion and Sediment Control Plan which is being reviewed for County compliance. The
Plan proposes measures including a basin to capture sediment -laden run -off during
construction. These measures are anticipated to reduce sediment -laden runoff from leaving
the site. Inspection and bonding by the County will monitor maintenance of the erosion
control facilities during construction. Proper stabilization and maintenance will achieve long
term stability.
4. "loss of aesthetic resource": The disturbance of the existing critical slopes with this
development involves the removal of existing vegetation.
5. "septic effluent ": The critical slopes disturbance in the area of the proposed drainfield
involves the clean up of an existing soil and debris pile. The critical slopes disturbance does
not affect the travel distance of septic effluent.
No portion of this site plan is located inside the 100 -year flood plain area according to FEMA Maps,
dated 04 February 2005.
Based on the above review, the applicant has satisfactorily addressed the technical criteria for the
disturbance of critical slopes.
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