HomeMy WebLinkAboutWPO200800104 Review Comments Erosion Control Plan 2008-12-22�'JRGINLP
COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road
Charlottesville, Virginia 22902 -4596
Phone (434) 296 -5832 Fax (434) 972 -4126
Project: WPO- 2008 - 00104, Emmanuel Episcopal Church
Plan preparer: Mr. Mark Lieberth; Land Planning & Design mark @lpda.net
Owner or rep.: Emmanuel Episcopal Church; Theodore Caplow,
George W Ellinger & Elizabeth Pinkerton Scott
Date received: 7 November 2008
Date of Comment: 22 December 2008
Engineer: John P. Diez/Amy Pflaum - Current Development Engineering
The Water Protection Ordinance application for Emmanuel Episcopal Church, received on November 7.
2008, has been reviewed. The plans cannot be approved as submitted and will require the following
corrections before approval can be granted:
A. General Review Comments
1. Please provide a scale and North arrow for the vicinity map.
B. ESC Plan Review Comments
2. The limits of disturbance are unclear. Please provide limits of disturbance with a thicker line to
help highlight its perimeters.
3. The drainage divides to the sediment traps are unclear. Please provide drainage divides for all
drainage areas to proposed facilities as used in the computations.
4. The plans state that the construction entrance will drain to Sediment Trap "A ". We suggest that the
entrance be drained to Sediment Trap `B" since it is much closer than ST -A. there is concern that
the runoff will not reach ST -A.
5. Please indicate where church visitors will be parking during the time of construction. Also,
demonstrate the circulation for the construction vehicles.
6. There appears to be a pipe in ST -A. Please refer to the Virginia Erosion & Sediment Control
Handbook method for design of sediment traps.
7. The diversion dike on the south side of the construction entrance should be extended 40' to 45' to
the West to assure sediment -laden runoff from the construction entrance is directed to the trap.
C. SWM Plan Review Comments
8. Please refer to the Virginia Stormwater Management Handbook, section 3.10B for complete
requirements for the design of infiltration trenches. Please submit all necessary information
pertaining to your design for review.
9. The drainage divides to the proposed stormwater management facilities are unclear. Please provide
drainage divides for all drainage areas to proposed facilities as used in the computations.
10. The removal rates listed for each drainage area seem low. Please include the impervious area and
removal rate calculations in your submittal.
11. Separate design information and calculations are necessary for the two different stormwater
facilities proposed as IT -2.
12. The "rip -rap channel" being proposed by the existing septic tank in Stormwater Area IT -1 appears
to be in the wrong location. It would make more sense to move it to the corner of the proposed
parking lot where water that has collected in the curb will be released. The rip -rap could direct
this water to the infiltration trench.
13. The Detention Compliance table states that IT -1 & IT -2 are designed to store the entire 10 -yr post
development run -off volume. Please provide further detail so that this statement can be verified.
Run -off calculations were not submitted for TT -3 and TT -4.
14. Please provide sizing calculations for the proposed 12" storm drain. What type of inlet is
proposed? This pipe needs a standard end section.
15. The proposed rain tanks in IT -3 and IT -4 provide detention only, not water quality. How will
water quality be handled in these areas?
Once these comments have been addressed, please submit 2 copies of the revised plans, calculations, and
narratives 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 adpflaum @albemarle.org to
schedule an appointment.
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