HomeMy WebLinkAboutWPO201200051 Review Comments Erosion Control Plan 2012-10-16i"
,. `IRGINZP
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:
Plan preparer:
Owner or rep.:
Plan received date:
Date of comments:
Reviewer:
Review coordinator:
Free Bridge Office
Dominion Engineering
Hurt Investment Company
7 June 2012
(Rev]) 5 September 2012
14 June 2012
(Rev]) 16 October 2012
Michael Koslow
Megan Yaniglos
WP0201200051
[fax 434 - 979 -16811
[fax unknown]
The second erosion and sediment control plan (WPO201200051) submitted 5 September 2012 has
received Engineering Review and does not appear to meet Albemarle County minimum checklist
items for approval. Please adequately address the following comments for final approval:
Existing Conditions Information
1) All topography should be at least visually field verified by the designer within the last year. Please
verify existing topography and note as much on the plans.
(Rev]) Comment has been addressed.
Proposed Plan View Information
1) Landscape plan on sheet C6 indicates a Willow Oak tree is proposed atop a 2:1 slope west of
proposed office building. Please revise to indicate low maintenance ground cover for all proposed
slopes < 3:1 including this location and relocate proposed tree.
(Rev]) Comment has been addressed.
2) ESC plan on sheet C7 indicates permanent seeding is proposed atop a 2:1 slope west of proposed
office building. Please revise to indicate low maintenance ground cover for all proposed slopes <
3:1 including this location.
(Revl) Comment has been addressed.
3) Please indicate adequate channel for off -site runoff to existing SWM pond. All off -site runoff
must be contained within proposed or existing drainage easements. Please indicate drainage
easements with deed book and page number.
(Rev1) Adequate channel analysis needs to show all drainage to previously approved existing
SWM pond including all contributing off -site drainage. Please indicate plan numbers for
previously approved WPO plans or an independent analysis for drainage to the approved
existing SWM pond (appears to reference WPO2006- 00075).
Analysis should show "pre" (existing) and "post" (or existing + additional) development flows
for Structures STR -57, STR -56, STR -55, STR -54, and STR -53 to demonstrate pipe adequacy
for these structures in a 2 year and 10 year storm event.
Please provide labels and units for Storm Drain Design Computations table on sheet AD2.
Engineering Review Comments
Page 2 of 3
4) Limits of construction shown on sheet C7 indicate proposed grading off -site on parcel "A portion
of TMP 78 -11" (Kia), parcel "Residue of TMP 78 -11" (Whitehouse), and parcel "TMP 78 -57B
(Free Bridge Auto Sales). Please provide grading easements or temporary construction easements
for these proposed off -site disturbance areas.
(Rev-1) Please propose a temporary grading easement for the parking spaces construction on
TMP 78 -57B.
Erosion Control Plan
1) Please describe proposed off -site area for project earthwork waste. This area is subject to ESC
review and must be stabilized and protected.
(Rev]) Comment has been acknowledged.
2) Please update General Erosion and Sediment Control Notes from latest version on County website.
(Rev-1) Comment has been addressed.
3) Please update section B5 "Critical Areas" to match existing topography shown on plans.
(Rev]) Comment has been addressed.
4) Please identify stormwater runoff considerations in Erosion Control narrative.
(Rev-1) Comment has been addressed.
5) Please include a sediment trap or phased construction initially including culvert inlet protection at
STR -1 at project low point / outlet on sheet C7. Please update construction sequence and erosion
control legend to include this measure.
(Rev]) Comment has been addressed.
6) Please label existing contour elevations and existing drainage divides on ESC plan view on sheet
C7.
(Rev]) Comment has been addressed.
7) Please include a temporary right -of -way diversion for runoff above proposed construction
entrance.
(Rev]) Comment has been addressed.
8) Please label existing soils and soil boundaries on sheet C7.
(Rev-1) Comment has been addressed.
9) Please protect northwest and southeast perimeters from runoff with temporary diversion dikes.
(Revl) Comment has been addressed.
10) Please update sediment trap detail on sheet C8 to reflect site conditions. If culvert inlet protection
is proposed instead of a sediment trap, please remove this detail (it appears to be mistakenly
included with the plan set).
(Rev-1) Comment has been addressed.
Engineering Review Comments
Page 3 of 3
Current Development Engineering is available from 2:30 -4 PM on Thursdays to discuss these review
comments. Please contact Michael Koslow at 434 - 296 -5832 ext. 3297 or email mkoslow @albemarle.org
to schedule an appointment.
[17- 204.f] An application for an erosion and sediment control plan that requires modifications, terms, or conditions to be
included in order for it to be approved shall be deemed to be withdrawn if the owner fails to submit a revised plan addressing the
omitted modifications, terms or conditions within six (6) months after the owner is informed of the omitted information as
provided under paragraph (B).