HomeMy WebLinkAboutWPO200900014 Review Comments Erosion Control Plan 2009-05-14� OF AL
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COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road
Charlottesville, Virginia 22902 -4596
Phone (434) 296 -5832 Fax (434) 972 -4126
Project: Biscuit Run Connector Road [WP0200900014]
Plan preparer: Scott Collins, Collins Engineering [scott @collins- engineering.com]
Owner or rep.: Forest Lodge, LLC
Plan received date: 31 March 2009
Date of comments: 14 May 2009
Reviewer: Amy Pflaum, Current Development Engineering
The Water Protection Ordinance Application for the Biscuit Run Connector Road, submitted on 31 March
2009, has been reviewed. The plans cannot be approved as submitted and will require the following
changes /corrections prior to final approval.
General Plan Comments
1. There is a notable elevation difference in the proposed grading of the connector road (stations
65 +00 to 80 +00) between these plans and the approved ZMA. The Director of Planning must
determine that the proposed grading is consistent with the application plan before a grading permit
can be issued. [18- 8.5.5.4.b] Alternatively, a site plan or subdivision plat must be submitted and
approved before a grading permit can be granted.
2. Please submit a request for a critical slopes waiver per Section 18 -4.2.5 of the County Code.
3. Please submit copies of required state and federal permits for work within and disturbance to
wetlands and waterways.
Erosion Control Plan
4. The Erosion and Sediment Control Notes and Details sheet contains several redundancies. For
example, there are three different listings of "Erosion & Sediment Control Measures" each
containing a definition of a Construction Entrance. Please review all text on this page for
consolidation options.
5. Please label the Albemarle County Erosion and Sediment Control Notes as such.
6. Please include the Conservation and Preservation areas as Critical Areas on the E &S Narrative.
7. The Erosion and Sediment Control Narrative should include a discussion of the measures proposed
to meet the 80% sediment removal rate required by Proffer 5B. It should also discuss the
provisions of revegetation outlined in Proffer 5C.
8. Some erosion and sediment control measures are too far from the road, please move measures
closer to the road to eliminate the likelihood of disturbance outside the limits.
9. Bio- retention Basin #3 is too far from the road and its conversion to a stormwater management
facility will be extremely delayed due to future development disturbing its drainage area.
10. It appears that the limits of disturbance and tree protection fencing area shown inside the stream
buffer on Sheet ESC -2. If the sediment basin can not be moved outside of the stream buffer, a
Request for Development Within a Stream Buffer must be submitted to and approved by the
Program Authority.
11. The "clean water diversion" along the northern boundary of SB -area 9 will deposit concentrated
flow into the conservation area. Also, a "clean water diversion" is not an erosion and sediment
control measure recognized by the VSESCH, and can only be approved if a variance is granted by
Albemarle County Community Development
Engineering Review Comments
Page 2 of 2
the Program Authority.
12. There are no E &S measures protecting the area within the limits of disturbance to the southwest of
SB9. The limits of disturbance and tree protection are shown within the stream buffer.
13. It is unclear how the silt fence will "prevent excess disturbance" in the conservation area. This silt
fence is shown installed contrary to the requirements of the VESCH. Tree protection or safety
fence may be more appropriate.
14. A portion of the diversion dike to S138 is outside the limits of disturbance.
15. Please expand the limits of disturbance on Sheet ESC -3 to include the natural drainage swale that
will carry "bypass flow" to S138 in anticipation that stabilization or repairs may be required within
this swale.
16. The longer baffle in S138 appears to bisect, rather than redirect, the flow received from the
diversion dike.
17. Limits of disturbance and tree protection fencing surrounding S137 are shown within the
Preservation Area.
18. The diversion dike directing flow to S135 needs to be extended to the length of the drainage area
boundary.
19. The stockpile area next to SB 1 should be within the limits of the drainage area of SB 1.
20. MS -19 is not necessarily just and "end -point analysis ". Cross - sections of the streams and swales
within the property should also be studied for adequacy. It is recommended that a cross - section be
taken at each sediment basin/trap outlet.
21. In order to meet the requirements of MS -19 with respect to the existing intermittent streams and
swales within the property, the applicant will conduct current condition analyses of the channels
by performing a field visit to document (with notes and photographs) the current condition of the
full reach of the streams. If degradation of the streams should occur as a result of the on -going
construction or development of the road, the applicant is responsible for implementing corrective
measures to the satisfaction of the County.
22. An E &S bond amount will be computed by the County once the plans have been approved.
Stormwater Management Plan
23. Because changes to the erosion and sediment control plan may impact the stormwater management
concept, this plan will be reviewed after further erosion and sediment control plan details have
been worked out.
Once these comments have been addressed, please submit 4 copies of the revised plans and reports to
Current Development Engineering.
Current Development Engineering is available from 2:30 -4 PM on Thursdays to discuss these review
comments. Please contact Amy Pflaum at 434 - 296 -5832 ext. 3069 or email Mflaum@albemarle.org to
schedule an appointment.
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