HomeMy WebLinkAboutSUB201200038 Review Comments Critical Slope Waiver 2012-08-15*—&A
County of Albemarle
Department of Community Development
Memorandum
To: Ellie Ray, Current Development planning and zoning review
From: Michael Koslow, Current Development engineering review
Date: 15 August 2012
Subject: Westlake Hills (SUB201200038) critical slope waiver request #2
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 proposed single unit subdivision and includes several small (less than 200 syd) critical slope
areas. The applicant is proposing to include subdivision roads and utilities to serve 131 development units
with proposed slopes up to 3:1.
Areas
Acres
Total site
140.186 acres approximately
Critical slopes
12.21
9% of site
Critical slopes disturbed
1.40
11% of critical slopes
Exemptions to critical slopes waivers for driveways, roads and utilities without reasonable
alternative locations:
82% of proposed critical slope disturbances are exempt (including all proposed critical slopes disturbances
in conflict with area proposed to be Eastern Park in Crozet Master Plan).
Compliance with Zoning Ordinance 18 -4.2:
,'movement of soil and rock"
Proper slope construction, control of drainage, and vegetative stabilization should prevent any
movement of soil. Much of that will depend on activities of individual builders.
"excessive stormwater runoff'
Stormwater runoff will be increased in this area, as steeper man -made slopes typically result from
leveling associated with building construction.
"siltation"
Inspection and bonding by the County will help to ensure siltation control during construction. Proper
stabilization and maintenance can help long term stability. However, the lots proposed existing or
proposed critical slopes make future critical slope disturbances likely if not properly planned.
"loss of aesthetic resource"
The proposed development is consistent with the Crozet Master Plan.
"septic effluent"
This neighborhood is serviced by public sewer.
Based on the review above, engineering recommends conditional approval of this critical slope impacts
waiver request. Specific challenges to the project as proposed include serving lots with driveways with
16% maximum slope which include existing or proposed critical slopes. An overlot grading plan is
recommended for all lots with existing or proposed critical slope disturbances.
file: C:\ Users \mkoslow\Documents \Current Reviews \SUB201200038 Westlake Hills - Preliminary\E2_csw_MAK_SUB-2012-00038 Westlake
Hills.doc