HomeMy WebLinkAboutWPO201400005 Review Comments Erosion Control Plan 2014-02-25�RGICn4'
WPO Plan Review
Project: Monu Park
Number: WP0201400005
Date: 25 Feb 2014
Reviewer: Michelle Roberge
COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road
Charlottesville, Virginia 22902
This is an abbreviated review comment notice. County engineering staff is available every Thursday
afternoon to discuss details of review. To schedule, please call your reviewer for an appointment.
Erosion & Sediment Control:
(Code Chapter 17, Article II)
Y N
X
X
X
Adequate
X Not Adequate
State standards followed, and Design Standards Manual notes and details
X I Adequate limits and perimeter measures out of work areas
All stages protected adequately
Adequate channels
X There is no sediment protection for stream when outlet pipe is built. I
recommend relocating outlet pipe to stream north of site and showing
erosion and sediment control measure to protect stream.
Stormwater Management:
(Code Chapter 17, Article III)
Adequate
X Not Adequate
Y N
X Enough capture and treatment for on -site areas
See Enough detention storage for on -site areas
comment
XI Sealed hydrologic and hydraulic computations provided
X ■ It is difficult to tell if runoff will drain to the biofilter since site is so flat. The
applicant has confirmed that runoff will drain to the end of the parking lot. If
during construction it is found that the runoff does not drain to the biofilter,
we will ask to build ditches along both lengths of parking lot. The ditches will
be included in the bond estimate.
■I recommend increasing the forebay to the length of biofilter to
ensure all runoff from parking lot is captured.
■Please relocate outlet pipe to stream north of site. It is less distance
and will reduce land disturbance.
■Provide calcs for the biofiliter design. Are you still intending to have
an internal water storage within the biofilter? It does not appear to be
the case based on the depth of the biofilter. Please clarify since a perc
rate report will be necessary for an internal water storage design.
■Provide pipe profiles.
■The pondin2 depth is 0.5' for treatment. Please show the 10 vear
storm water mark elevation. If runoff is not intended to perc 100 %,
please clarify principal spillway.
On sheet C -302, label the CN and Tc for the DA to biofilter.
Mitigation:
(Code Chapter 17, Article 111)
Y
N
X Adequate
Not Adequate
Buffers and disturbed areas adequately shown
Adequate plantings at 2:1, or other mitigation provided
The mitigation area may be difficult to locate. Show the proposed
parking lot to clarify location.
This review attempts to encompass the larger compliance questions. County staff does not assume
responsibility for any calculation or plan details, and cannot cover the intricacies of every plan submitted.
Each plan and calculation must have a professional seal and signature to assume these responsibilities.
This plan
Approved (please see attached Approval Fact Sheet)
X Not Approved
is