HomeMy WebLinkAboutWPO201100051 Review Comments Stormwater Management Plan 2011-08-23COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road
Charlottesville, Virginia 22902 -4596
Phone (434) 296 -5832 Fax (434) 972 -4126
Project: Country Green Cottages SWM Amendment (WPO- 20 1 1- 0005 1)
Owner: Mr. Dale Ludwig
Applicant: Mr. Tim Miller, PE; Meridian Planning Group, LLC
Plan received date: 18 July 2011
Date of comments: 23 August 2011
Reviewer: Phil Custer
The SWM Amendment for Country Green Cottages (WPO- 20 1 1 - 0005 1), received 18 July 2011, has been
reviewed by engineering. The following comments must be addressed in order to receive plan approval:
1. The incoming pipe is in a different alignment than the approved plan. Is this current pipe location
based on the as -built condition?
2. The county will grant a variance for the downstream slope of 2.5:1 (steeper than the 3:1 standard)
if a 2.5:1 slope is applied to the upstream slope of the embankment in keeping with the 5:1
standard as outlined on VSMH 3.01 -13.
3. The width of the embankment is not adequate. The embankment detail states that the provided
width is loft, but this width is only accurate for the distance between the 488 contours.
Embankment widths must be measured at the top elevation, 488.8.
4. Please provide horseshoe - shaped gravel rings around the two inlets to create makeshift forebays.
This will not affect any of the water quality or water quantity calculations.
5. Please provide Top of Wall and Bottom of Wall spot elevations for the new wall.
6. The plan shows disturbance to the neighboring property, TMP 76 -52J3. Also, disturbance is
needed to this property to apply a roofdrain system on the back gutters to drain to the biofilter.
Please provide a signed letter from the owner of this lot consenting to the grading shown on the
plan and the construction of the roofdrain system implied in the approved SWM plan.
7. Please provide a landscape schedule on sheet C -101. Also, it appears more plants are needed to
meet the state's 10 plants per 1000sf guideline. [VSMH 3.11 -20]
8. The outlet protection at the end of the barrel seems to have significantly eroded in the last several
years. The design of this outlet should be reexamined to discover a more stable solution.
9. Provide a detail for the pipe outlet through the wall.
10. Please replace "Luck Bio- Filter Mix or approved equal" with "State Approved Mix" wherever the
Luck mix is specified.
11. The SWM bond will be recomputed at the time of plan approval and the applicant will need to
post it in order to construct the facility.