HomeMy WebLinkAboutSDP200800066 Review Comments Critical Slope Waiver 2008-07-10�'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: SDP- 2008 - 00066, Hunters Way, Major Amendment, Critical Slope Waiver Request
Date received: 08 July 2008
Date of Comment: 10 July 2008
The request for a waiver to develop on areas of critical slope for grading incorporated with the new construction
proposed on TMP 78 -49B1 was received on 08 July 2008. The existing critical slopes and proposed grading are
shown on the Major Amendment to Final Site Plan dated
The engineering analysis of the request follows:
Description of critical slope area and proposed disturbance:
The critical slope areas within TMP 78 -49B 1 contain both natural and man -made slopes. The man-
made slopes are embankments created when the existing building and parking area on the parcel were
constructed per Site Plan SDP -83 -001. The natural critical slopes exist in two areas near the northeast
corner of the site and are wooded slopes.
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
2.187
Area of natural critical slopes
0.02
1.0% of development
Total critical slopes disturbed
0.02
100% of critical slopes
Below, each of the concerns of Zoning Ordinance section 18 -4.2 is addressed:
1. "rapid and/or large scale movement of soil and rock ": The 2 areas of natural critical slopes
on this site are small and scattered. The larger area will be cut into and graded flat to provide
a location for the new building's septic field. The smaller area is up against the property
boundary with TMP 78 -49C and will be cut into to steepen an embankment, providing for the
flat area below. Particular attention will be required in this area to stabilize the existing up-
slope embankment and the proposed engineered slopes. This will be noted in the review of
the Erosion and Sediment Control Plan which has been submitted for this project. Both
critical slope areas are small and 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 silt fence, storm sewer inlet protection and permanent
seeding on exposed ground during the stages of construction. These measures are anticipated
to reduce sediment -laden runoff from leaving the site. Inspection and bonding by the County
will ensure siltation control during construction. Proper stabilization and maintenance will
ensure long term stability.
4. "loss of aesthetic resource": The disturbance of the existing critical slopes with this
development does involve the removal of existing trees. This site is located within the
Entrance Corridor Overlay District, and is therefore subject to approval by the Architectural
Review Board.
5. "septic effluent ": The critical slopes disturbance is uphill from the existing and proposed
drainfields on this site. In the event of a septic system failure, any effluent which has
reached the surface will run to the parking lot of the existing building, into the storm sewer,
and to the river. The critical slopes disturbance does not affect the travel distance of septic
effluent.
This site does not drain into a waterway that is a public drinking water supply for Albemarle County.
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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