HomeMy WebLinkAboutZMA201100003 Review Comments Critical Slope Waiver 2011-09-26�1RCtN1P
County of Albemarle
Department of Community Development
Memorandum
To: Claudette Grant, Senior Planner
From: Glenn Brooks, County Engineer
Date: 26 Sep 2011
Subject: Willoughby Townhouses (ZMA201100003) critical slope waiver request
The critical slope waiver request has been reviewed. The engineering analysis of the request follows:
Description of critical slope area and proposed disturbance:
This is a drainage ravine and hillside above Moores Creek. The applicant is proposing to cut into the
hillside and fill below to build an apartment complex. Retaining walls above, and new slopes below will be
steeper (50% grade) than existing grades.
Areas
Acres
Total site
5.8 acres approximately
Critical slopes
approx.
2 acres
34% of site
Critical slopes disturbed
approx.
1 acre
50% of critical slopes
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Albemarle County Community Development
Engineering Review comments
Page 2 of 2
Exemptions to critical slopes waivers for driveways, roads and utilities without reasonable
alternative locations:
This disturbance is not exempt.
Compliance with Zoning Ordinance 18 -4.2:
"movement of soil and rock"
Proper slope construction, control of drainage, and structural and vegetative stabilization can minimize
movement of soil. In similar situations, movement of soil has increased beyond the construction phase
due to steeper constructed slopes being inherently less stable.
"excessive stormwater runoff'
Stormwater runoff will be increased, but it is proposed to be a controlled release through the drainage
system from the site.
"siltation"
Inspection and bonding by the County will monitor siltation control during construction. Proper
stabilization and maintenance will be needed to ensure long term stability.
"loss of aesthetic resource"
This area will likely be visible from the roads and shopping center proposed across Moores Creek, and
from the existing Willoughby Neighborhood.
"septic effluent"
This neighborhood is proposed to be serviced by public sewer.
Based on the review above, caution is recommended due to steep hillsides and proximity to the creek.
Extra stabilization measures are recommended.
file: Mew zma2011-3—GEB—template