HomeMy WebLinkAboutWPO201400004 Review Comments Erosion Control Plan 2014-03-21i"
,. `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: Old Trail Village Blocks 28 & 29B (SDP201400009, WP0201300065)
Plan preparer: Roudabush, Gale & Assoc. [cmulligan @roudabush.com]
Owner or rep.: MARCH MOUNTAIN PROPERTIES LLC
Plan received date: 11 February 2014
Date of comments: 21 March 2014
Reviewer: Max Greene
The site development plans submitted 11 February 2014 have received Engineering Review and
do not appear to meet Albemarle County minimum checklist items for approval. Please adequately
address the following items for final plan approvals per Albemarle County Code:
1. Site plan:
a. Please update the topography to within one year of submittal date. The
topography should at least be field verified and stated on the plan with a date of
verification. [14 -302, 18- 32.5.2, policy]
b. Lot #20 driveways is shown across "Open Space" and appears to have adequate
room on the lot for the driveway. Recommend moving driveway off "Open
Space" lot.
c. Storm drain pipes are missing from sheet 5 of 26.
d. Please provide a bench mark location, elevation and datum for topography.
[policy]
e. Proposed grading has a mix of contour intervals making the topography difficult
to decipher. Please pick either the F contour or the 2' contour for consistency.
f. Please make sure match lines are correct and page numbers are accurate.
g. Please show all buffer limits on plans.
h. Buffer disturbance will need a mitigation plan.
i. Please show critical slopes on the plans. [18 -4.2, 14 -304]
j. Please show the easements on the plan and check the depth to easement width for
excavation limits. [18- 32.6.2.g]
k. Please show sight distance lines on landscape plan to verify unobstructed sight
easements. Trees may need to be moved out of lines of sight.
1. Please show road name and traffic sing locations on the plans.
m. Please change the line weight for existing pipes so they will not be counted as
proposed.
n.
2. Drainage and road:
a. Please show the Stormwater drainage easements on the site plan. [Code Sec. 18-
32.5.2, 18- 32.6.2.d]
b. Future storm drainage systems shall have an outlet to prevent them filling with
water over time. [structure 144]
c. Please show VDOT designations for entrances on the plan.
d. VDOT approval is required for final plan approvals.
Engineering Review Comments
Page 2 of 3
e. Fire /rescue department approval is required for final plan approvals.
f. Alleys will be designed to prevent stormwater flows from entering intersections.
Please use the rural street intersection criteria of continuing the -2% cross grade
for a minimum 20' from the edge of pavement of the intersected street down the
alley to provide a low point off the intersected street for drainage.
g. Please show Cross -drain locations on plans at every major cut fill transition or sag
with VDOT designations.
h. Please update all standard notes as shown in the ACDSM.
i. Please check angles of deflections on storm water system. Drainage pipe angles
need to be 90 degrees or greater. For example stormwater structures 110 and 117
appear to be less than 90 degrees.
j. Please provide drainage profiles for the entire stormwater system.
k. Please show inlet shaping for stormwater manhole junctions to reduce the risk of
standing water/ breeding areas for mosquitoes.
1. Pipes with slopes less than 0.5% are too flat and may not be self cleaning.
Albemarle County Policy is for all stormwater systems will have a minimum 0.5%
slope.
3. Stormwater Protection:
a. Stormwater management proposal will be addressed by the County Engineer.
4. Erosion and Sediment Control:
a. Blocks 29A & 35A do not appear to be shown correctly. Please show the existing
topography now that grading has occurred on Blocks 29A & 35A. [14 -302, 18-
32.5.2, policy]
b. Bulk grading plan has a mix of 1' and 2' contour intervals and is inconsistent.
Please pick one contour interval to reduce misinterpretation of proposed grading.
c. Double row of silt fence do not typically work and are difficult for the contractor
to maintain. Please show a sediment trap in the lowest area near the pond. It can
be filled in after site stabilization to finished contours shown.
d. Please show temporary /permanent seeding on the "Bulk grading Plan ". Seeding
will not be required unless project or portions of project will not be completed
within the 9 month land disturbance time limit. [Code Sec. 17-207.B.2]
e. Sediment basin construction details are required.
f. Sediment traps with diversions that bisect the site do not work in the field and are
a burden to both the contractor and inspector to maintain the drainage divisions.
Can this side of the project be piped to the sediment basin?
g. Blocks will need E &SC protection to keep mud off the new road construction.
This office recommends a sediment trap behind inlet structure #112 with a pipe
into the back of structure #112.
h. Silt fence or earth berm draining to control structures should be placed behind
sidewalks to protect the new road and sidewalk areas from sedimentation until the
vegetation is established.
i. Please remove proposed 1' contours or make the whole plan with 1' contours.
j. Please show the stock pile locations on the plan.
k. Please show staging and parking areas for the contractors and other construction
related areas.
Once these comments have been addressed, please submit 3 copies of the revised plans, calculations, and
narratives to Current Development Engineering along with the required review fee and transmittal form.
Due to the level of completeness of this submittal additional comments or conditions may be
forthcoming.
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 Max Greene at 434 - 296 -5832 ext. 3283 or email m .-reene @albemarle.ora 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).
File: CDDEI_MRG_sdp,esc,swm_O`fV Blocks 28 & 29B.doc