HomeMy WebLinkAboutSUB201200016 Review Comments Preliminary Plat 2012-02-24*—&A
County of Albemarle
Department of Community Development
Memorandum
To: Joanne Purtsezova, Project Planner
From: Michael Koslow, Engineering Review (SUB201200016)
Project: Glenmore, Lots 24 — 27 - Preliminary Plat
Plan preparer: Mr. Scott Collins, PE; Collins Engineering
Owner or rep.: Glenmore Associates Limited Partnership
Plan received date: 6 February 2012
Date of comments: 21 February 2012
Reviewer: Michael Koslow
The preliminary subdivision plat has been reviewed:
1. Require the applicant includes the alignment and width information for Running Deer Road and
Farringdon Road with this preliminary plat [14- 302.3].
2. Require the applicant to update the existing topography to reflect the construction of Farringdon
Road and Running Deer Road [14- 302.12].
3. There need to be drainage easements included with this preliminary plat. Require the applicant to
show roadside ditch limits for Farringdon Road and Running Deer Road. Private drainage
easements will be required to drain these private roads. Need to verify the ditch maintenance
limits are within these private easements. Drainage easement on east side of Farringdon Road will
need to extend to apparent outlet in lot 23 (DB 2422 PG 466).
4. Not all critical slopes have been shaded. On the front sheet for the final plat, require the applicant
to provide a table of all non - exempt critical slope disturbance so that critical slope disturbance can
been tracked. See also comment #2 as the road - influenced slope areas will need to be included
with the disturbance area computation.
5. An erosion and sediment control plan for the disturbance to construct the sanitary sewer line,
perform all lot grading, and erect all houses must be approved prior to final plat approval.
Agreement in lieu of plans will not be relied on for the construction of these 4 lots.
6. No information has been provided regarding stormwater management. When the proposed
grading plan is included in the next submittal, please show the updated drainage area to what
appears to be a needed sediment trap in Lot 27 before runoff reaches the intermittent stream
crossing Farringdon Road with existing drainage easement DB 2422 PG 466. During the rezoning
review, the stormwater management plan was not as detailed as the county was accustomed to
seeing. This was noted by the County Engineer, Jack Kelsey, in his memorandum on 24 July
2007:
Stormwater Detention:
The applicant has assumed a waiver for stormwater detention will be granted as part of the
final development plan review. In this case it is an acceptable concept. However, as part of the
final development plan and in accord with Code 17- 314.F.6 the applicant must demonstrate to
the satisfaction of the Program Authority that off -site improvements or other provisions for the
disposition of surface water runoff would equally or better serve the public interest and safety,
and that such method of disposition would not adversely affect downstream properties or
stream channels.
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Albemarle County Community Development
Engineering Review comments
Page 2 of 2
Stormwater Quality:
The applicant has proposed to address water quality by working with the water resources
manager to dedicate stream buffers as part of the final development plan review. However, in
order for dedicated stream buffers to provide any water quality benefit the runoff from
impervious surfaces must be allowed to sheet flow through the buffers and be adequately
treated. No water quality credit is given for the concentrated release of runoff (in pipes or
ditches) into or through the buffers. Based on the conceptual grading in this application,
nearly all of the runoff from proposed streets will be collected /conveyed in ditches and culverts
and then released as concentrated flow into the existing intermittent streams. Please revise the
grading plan to be consistent with the conceptual water quality treatment proposed. Be mindful
that erosion & sediment control measures (traps or basins), that will be required for this
development, may be converted to serve as water quality facilities.
The following comments are advisory and do not need to be addressed prior to preliminary plat approval.
An erosion and sediment control and stormwater management plans will be required prior to final
plat approval. The plan will need to show all new ESC measures necessary to protect all grading
in addition to the construction of all utility lines.
On one of the sheets of the ESC plan revision, the applicant will need to provide an updated
acreage for land being disturbed for the Leake Property. Total disturbance will not be allowed to
exceed 30 acres. [ZMA- 2006 - 00016, Proffer 6]. This subdivision proposes disturbance for
possibly up to 4.29 Acres (the proposed subdivision area). A review of the County WPO database
indicates 5.32 Acres are currently anticipated for development in the Leake section:
County Project # Disturbance Area (Ac) Notes
WPO201100037 3.3 Glenmore Section K2B
WPO201100075 2.02 Glenmore Lot 28
Please keep in mind as future Leake sections become proposed for subdivision and development.
9. The road bond for Carroll Creek Road has been posted on 1/21/2011. However, bonds for ACSA
will need to be posted prior to the approval of the final plat.
10. Future anticipated fees associated with the engineering review of the final plat and site grading
permit and inspection include but are not limited to:
Erosion & Sediment Control plan review fee $300
Stormwater Management plan & calcs review fee $300
Subdivision bond calculation $250
Grading permit and first year inspections fee $100 / disturbed acre