HomeMy WebLinkAboutSUB200900062 Review Comments Critical Slope Waiver 2010-10-136A -&
County of Albemarle
Department of Community Development
Memorandum
To: Summer Frederick, Current Development planning and zoning review
From: Phil Custer, Current Development engineering review
Date: 13 October 2010
Subject: Wickham Pond Phase H Critical Slope Waiver Request (SUB- 2009 - 00062)
The critical slope waiver request has been reviewed. The engineering analysis of the request follows:
Description of critical slope area and proposed disturbance:
The applicant is requesting a waiver to disturb critical slopes to develop the parcels in accordance with
ZMA- 2005- 00018. The disturbance to critical slopes is needed to grade the site for buildings, roads, and
driveways as well as to install a sanitary sewer line. The alignment of the roadways and lot layout match
the approved rezoning plan and the plan appears to be in compliance with the overlot grading plan proffer.
This will be verified during the review of the road and ESC plans, prior to the approval of the final
subdivision plat.
TMP 56 -91 and TMP 56 -91B
Areas
Acres
Total site
19.551 total acres approximately
Critical slopes
1.07 ac.*
5.47% of site
Critical slopes disturbed
0.03 ac.*
2.8% of critical slopes
*These figures have been provided by the applicant in his request letter. However, after reviewing the
topographic information on sheet C -2, it is evident that more critical slopes exist on the property and are
being disturbed than claimed. For instance, the northern side of the Swale 40ft south of the existing
structure appears to be a notable strip of critical slopes. The increased amount of critical slope disturbance
has no effect on engineering's analysis of the waiver request.
Exemptions to critical slopes waivers for driveways, roads and utilities without reasonable
alternative locations:
The disturbance to critical slopes necessary to construct public sanitary sewer facilities is exempt from
preservation if the county engineer determines that no reasonable alternative exists.
Compliance with Zoning Ordinance 18 -4.2:
,'movement of soil and rock"
Proper slope construction, control of drainage, and vegetative stabilization will prevent any movement
of soil.
"excessive stormwater runoff'
A stormwater management plan must be approved for this project prior to construction. The plan will
collect as much of the runoff as possible and direct it to Stormwater Management facilities.
"siltation"
Inspection and bonding by the County will ensure siltation control during construction. Proper
stabilization and maintenance will ensure long term stability.
Albemarle County Community Development
Engineering Review comments
Page 2 of 2
"loss of aesthetic resource"
The critical slopes do not appear to be an aesthetic resource.
"septic effluent"
This development will be served by public sewer.
Engineering review has no objection to the approval of this waiver.
file: EI_csw_PBC_Wickham Pond Phase lI critical slope waiver engineering analysis.doc