HomeMy WebLinkAboutWPO200800011 Review Comments Erosion Control Plan 2008-04-18� OF AL
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COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road, Room 227
Charlottesville, Virginia 22902 -4596
Phone (434) 296 -5832 Fax (434) 972 -4126
Project: ACSA Red hill Water System [WP0200800011]
Primary Contact: Jeremy Lynn, ACSA jlynn @serviceauthority.org (434) 979 -0698
Applicant:
Jennifer Whitaker, RWSA jhitaker @rivanna.org (434) 293 -8858
Plan Preparer:
O'Brien & Giere Engineers bellre@obg.com (804) 270 -5808
Plan received date:
(Rev. #1) 17 April 2008
19 February 2008
Date of comments:
(Rev. #1) 18 April 2008
14 March 2008
Reviewer:
Max Greene
The Erosion and sediment Control plan submitted 17 April 2008 has received
Engineering review. This E &SC submittal appears incomplete and requires the following
changes /corrections:
1. Silt fence outlet protection is not an approved perimeter control measure. A
modification of the standard E &SC measures requires County Engineer/Program
administrator approval.
(Rev. #1) This Item appears adequately addressed at the time of this review.
2. Drainage area #1 does not appear to meet the minimum State requirements for Silt
fence. [Std. & Spec. 3.05] Drainage areas #1 might be protected by showing a 50'
section of the silt fence that is level on grade so water will filter through equally
for the 50' length of silt fence. This office recommends wire - supported silt fence
for the 50' level section incase of hydraulic backpressure during a runoff
producing storm event.
(Rev. #1) Plan appears to show modified E &SC measures and will require County
Engineer/Program administrator approval. Please make a formal request to the
County Engineer for the modification as shown on the submittal. The modifications
are the 2' stone outlets.
3. Drainage area #2 does not appear to meet the minimum State requirements for silt
fence. [Std. & Spec. 3.05] Drainage area #2 might be protected by showing a
120' section of the silt fence that is level on grade so water will filter through
equally for the length of silt fence. This office recommends wire - supported silt
fence for the 120' level section incase of hydraulic backpressure during a runoff
producing storm event. Otherwise, a sediment trap will be required.
(Rev. #1) Plan appears to show a sediment trap but is not labeled as such and no
Albemarle County Community Development
Engineering Review Comments
Page 2 of 2
Computations have been attached. Please show the proposed grading, bottom
dimensions for the trap, and include the computation design information for review.
The Sediment trap will be moved out of the proposed fill area. Perimeter control
structures are required until the site is deemed stabilized by the County Erosion
Control Officer. In addition, the wire supported silt fence could be replaced with a
diversion into the sediment trap to reduce the cost of E &SC protection.
4. Culvert inlet protection does not appear required and cannot be utilized if the total
drainage area is over 3 acres. [ Std. & Spec. 3.081
(Rev. #1) This Item appears adequately addressed at the time of this review.
5. County GIS mapping shows an unnamed intermittent stream and water protection
buffer adjacent to the property. Please changelcorrect the narrative to state this
fact and how it will be protected from sediment loads during the development of
this site.
(Rev. #1) This Item appears adequately addressed at the time of this review.
6. Please add a vicinity map to the plan sheet.
(Rev. #1) This Item appears adequately addressed at the time of this review.
7. Please add the following note: `Standard & Spec. 3.02 is adequate due to the lacy of
available water to the site. Should the temporary construction entrance not be maintained
properly or an excessive amount of soil found tracked onto the public roadway, then a
paved construction entrance, water tanker truck with 2 pressure washers and a settling
area may be required b -, the eros} "n and sediment control program administrator."
(Rev. #1) This Item appears adequately addressed at the time of this review.
8. Please add minimum standards #4, #5, #17, #18 and any other minimum standards
that will be required by the contractor.
(Rev. #1) This Item appears adequately addressed at the time of this review.
Just a reminder, DCR is enforcing the VSMP General Permit Registration Statement.
Please contact Mr. Matthew Grant, DCR, at 804.225.3068 for more information. This
does not affect your review /approval of this plan.
Additional comments and/or conditions may be forthcoming, on the review of future
submittals, due to the changes required for this plan submittal.
Engineering staff is available on Thursdays from 2 -4 PM to discuss these review
comments. Please contact a Plan reviewer at 434.296.5832 to schedule a time to meet.
File: E2_ESC_MRG_Red hill Water System.doc