HomeMy WebLinkAboutWPO201300010 Review Comments 2013-02-05 COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road
Charlottesville, Virginia 22902
WPO Plan Review
Project: Seminole Trail Fire Station Additions & Renovations
Number: WPO201300010
Date Received: 03 Nov 2013
Date of Review: 3 Dec 2013
Reviewer: Michelle Roberge
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 State standards followed, and Design Standards Manual notes and details
X Adequate limits and perimeter measures out of work areas
X All stages protected adequately
X Adequate channels
-Show diversions dikes to sediment trap on plan. I recommend
avoiding sharp bend to trap.
-Show pipe protruding from ground on plan.
-Show calcs for sediment trap. Show how much DA will be draining to
sediment trap.
-Show limits for stockpile area west of building.
-Show TS, PS and DC symbol on plans.
-This is amending the previous plan and will replace the previous plan.
Please clearly show the revised E&S phasing for this project since it
appears the construction sequence has been revised.
Stormwater Management:
(Code Chapter 17, Article III)
Y N
Enough capture and treatment for on-site areas
Enough detention storage for on-site areas
Sealed hydrologic and hydraulic computations provided
Mitigation:
(Code Chapter 17, Article III)
Y N
Buffers and disturbed areas adequately shown
Adequate plantings at 2:1, or other mitigation provided
Adequate
x Not Adequate
n/a Adequate
Not Adequate
n/a Adequate
Not Adequate
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 is Approved (please see attached Approval Fact Sheet)
X Not Approved
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: Seminole Trail Fire Station
Plan preparer: DJG Inc [fax 757-253-2319]
Owner or rep.: County of Albemarle [434-872-4501]
Plan received date: 19 Apr 2013
Date of comments: 13 May 2013
Reviewer: Michelle Roberge
A. Erosion Control Plan (WPO201300010)
1. Please show the proposed water and sewer easements as a heavy dashed lined on sheet C-104 & C-
105.
2. Please show the proposed gas line as a heavy linetype on sheet C-104 & C-105.
3. Change note 4.1 to “Install new storm piping and structures shown in phase III plan as necessary
for phase II construction…”
4. On sheet C-103, please show outlet protection symbol for all outfalls.
5. On sheet C-103, please show the inlet protection label for DI-2. Also, please fix the leaders
labeling DI-5 & 6.
6. On sheet C-103, please label the the drainage easements, “Proposed permanent drainage
easement.”
7. It appears the grading for the concrete pad (north of bldg) will not allow far east door to open.
Please revise.
8. Please show, at a minimum, a 0.1’ positive flow drop between the the invert in and invert out on
each stormdrain structure.
9. On sheet C-502, please change the stone size to 6”.
B. Stormwater Management Plan (WPO201300010)
1. Please clearly show a sump area for the 35’-4” pvc pipe, by showing 3 spot elevations around it
and adding a note that explains this sump area.
Sincerely,
Michelle Roberge
File: E1_rp,esc,swm,fsp_GEB_template.doc
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: Seminole Trail Fire Station
Plan preparer: DJG Inc [fax 757-253-2319]
Owner or rep.: County of Albemarle [434-872-4501]
Plan received date: 4 Feb 2013
Date of comments: 25 Feb 2013
Reviewer: Michelle Roberge
A. Erosion Control Plan (WPO201300010)
1. Sheet C-101, which combines the three phases of the demo plan and E&S plan, is difficult to
follow. I recommend providing in-sets within the sheet to clearly show the limits of disturbance,
demo, and erosion control measures within each phase. For example, the drainage inlets are
showing to be removed, but it also shows inlet protection.
2. Please show one construction entrance for all phases. Please use our detail found in the Albemarle
County Design Standards Manual.
http://www.albemarle.org/department.asp?department=cdd&relpage=13525
3. It appears the note 3.1 on C-101 regarding the replacement of drainage inlets and pipes will be
done in phase II, yet the plans show it will be completed in phases II and III. Clearly show the
replacement of pipes and structures in one phase with the adequate erosion control measure. Also
add a note in the construction sequence to show how fire trucks can access the bay area while the
pipe trenches are being constructed and stabilized, if this bay area is constructed in a different
phase.
4. While phase II is in construction, please show how pedestrians parked in the existing parking lot
can safely walk to the building.
5. The areas of Berkmar Drive being demolished does not match the areas of new pavement. Please
match the areas to be demolished to the areas of new pavement.
6. The stockpile location is outside your proposed limits of disturbance. Please provide a temporary
easement or a letter of permission for that property. If this is a marsh area, it may be difficult to
bring vehicles in and out. Also, it appears the route from the stockpile to the site is along Berkmar
Drive. Please address how you will prevent sediment from entering Berkmar Drive.
7. It appears that part of Berkmar Drive will also be disturbed. A permit from VDOT is required to
work on the ROW.
8. Please provide tree protection for oak trees north of site and south of parking lot.
9. Please show dust control, temporary seeding and permanent seeding symbols on sheet C-101.
B. Stormwater Management Plan (WPO201300010)
1. Per section 4.12.15 b), parking area grading and drainage systems shall be designed and
constructed to minimize, to the greatest extent practical, the amount of surface runoff exiting or
entering through entrances to public streets. It appears that both access roads will drain to a public
street. Minimize the amount of runoff entering the public streets by placing additional inlets at
west side of access roads. Revise the grading. See additional comments below that will impact
grading of access road.
Engineering Review Comments
Page 2 of 2
2. Per section 4.12.17 a), vehicle access aisles that are not adjacent to parking spaces, shall not
exceed a grade of ten (10) percent. It will be difficult to achieve this, but 12% is a reasonable
alternative. Please request the waiver in writing and provide all information necessary to justify
that no reasonable design alternative exists.
3. Per section 4.12.17 b), an adequate landing and/or grade transition shall be provided for vehicle
access aisles at the intersection with public streets or private roads to allow for the stopping of
vehicles and sight distance… As a guideline, the approach grade should not exceed four (4)
percent for a distance of not less than forty (40) feet measured from the edge of the street or road
being intersected. This is difficult to achieve but designing a vertical curve will provide an
adequate landing and a low spot for runoff to drain into additional inlets reffered to in comment 1.
4. YD-1 is shown on grade. I recommend changing the contours slighty to show sump conditions.
5. Please provide a bumper block for the handicap parking adjacent to the sidewalk. Concrete blocks
are required for parking stalls with a sidewalk less than 6’. Show the curb and gutter for this
parking stall with a handicap ramp in the unloading area. Also show spot elevations for corners of
sidewalk to avoid runoff north of site.
6. Please provide the outlet protection calculations.
7. Please provide the manufacturer’s certification and approval for your proposed Filterra design.
8. Also provide the removal rate computation found on our website to meet the water quality criteria.
http://www.albemarle.org/deptforms.asp?department=cdengwpo
9. Please provide the manufacturer’s certification and approval for your proposed cistern.
10. Please show the stormdrain profile for YD-1 to outlet 2.
11. Please show the waterline crossing between DI-4 and outlet 1 on the stormdrain profile on sheet C-
503.
12. Call out the spot elevations at corners of concrete pavement abutting the south of the bldg. Also
show the flow of runoff on pavement.
13. A building permit is required for retaining walls. Please refer to our Albemarle County Design
Standards Manual as a guide on what is required on plans. It appears the wall elevations are
staggered. Please show the bottom of wall elevations as well.
14. The access road to the parking lot is too steep where it meets Berkmar Drive. I recommend
reducing the slope where it is about 20% to about 12%-14% to smoothen out the transition
between the access road and Berkmar Drive.
15. Please show how the 12” pvc pipe will connect to the roof drains.
16. What is the solid line north of site overlapping the porch with stairs?
17. Provide a min 20’ drainage easements for proposed stormsewer.
18. The stair from the flag pole area to building entrance is over 1’. I recommend reducing height.
19. It appears that runoff will flow down to second landing and will pond. Please add a slight positive
drainage in this landing.
20. The chart on sheet C-503 for DI-1 is showing a type VDOT DI-21, which is a typo. Please revise.
Sincerely,
Michelle Roberge
File: E1_rp,esc,swm,fsp_GEB_template.doc