HomeMy WebLinkAboutFDP201500008 Review Comments Floodplain Development Permit 2016-03-04COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road, Room 227
Charlottesville, Virginia 22902-4596
Phone (434) 296-5832 Fax (434) 972-4126
Project:
Doyles River Crossing, 4877 Browns Gap Turnpike (Private Residence)
Plan preparer:
William S. Moore, P.E./Scott Kesecker, EIT / Balzer & Assoc. Inc.
1561 Commerce Road, Suite 401, Verona, VA 24482; skesecker(abbalzer.cc
Owner or rep.:
Kathleen Patricia Maybury and Joseph Bryant Calhoun III
1318 N. Wakefield Street, Arlington, VA 22207
Plan received date:
10 Dec 2015
(Rev. 1)
29 Feb 2016
Date of comments:
5 Feb 2016
(Rev. 1)
4 Mar 2016
Reviewer:
John Anderson
Floodplain Development Permit (FDP201500008)
Note: Plan Approved pending receipt of email scan of `No Rise' Certification —ref. Floodplain item #6.
Images included with initial comments removed for clarity.
Comments
1. Structural
1. Recommend guardrail/curb to protect against 5' vertical drop; design lacks safety element. As
there is no clear ordinance driving recommendation, ref. NSPE Code of Ethics/fundamental canon:
hold paramount the safety, health, and welfare of the public. Recommend revise crossing width to
provide space for 12' clear path plus barrier/s against accidental off -crossing vehicle movement.
(Rev. 1) Applicant response letter, Feb 12, 2016: "Based on existing proposed maximum driveway
grades, existing pipe lengths available and maximum headwall slopes, the deck width cannot be
widened. Client is aware of and accepts all risks with the proposed design."
2. Label width of embedded downstream edge of concrete (longitudinal /stream in-line dimension).
Clarify whether upstream edge of concrete is to receive embedded downturn. (Rev. 1) Addressed.
3. S 1 –Typical cross section and edge profile detail indicate Class 1 backfill compacted to 95%
standard proctor, but do not indicate staged construction. Recommend provide plan/profile details
with sequence notes that consider steel reinforcement (rebar) required to tie separate concrete pours.
Multiple pours appear needed to embed edges, the place compacted backfill, then pour deck, for
one half, then the other. Reinforcing steel should knit each section (pour) to subsequent sections.
(Rev. 1) Addressed.
4. Recommend monolith (strip) footers beneath upstream/downstream embedded downturns to help
limit scour, to provide additional stability against—and to withstand—periodic overtopping events.
(Rev. 1) Addressed.
2. Floodplain:
1. Please confirm private driveway access, not potential private street subdivision access (17.3 Ac. site).
(Rev. 1) Addressed.
2. Show existing crossing in approximate detail provide Notes/plan view details that clarify existing
conditions and demolition. Estimate FILL removed. Compare with calculated FILL proposed (cy).
(Rev. 1) Addressed.
3. Provide current BFE to nearest 0.1'. Provide proposed BFE to nearest 0.1'. (Rev. 1) Addressed;
Applicant response: "1.0 foot increments were used due to clarity reasons."
Engineering comments
Page 2 of 2
[18-30.3.11/Table, Permitted Uses]
Provide copies of VMRC, USAGE, DEQ permits, as applicable, required to work in live stream as
pre -requisite to receiving Alb. County Floodplain Development Permit [ref. 44 CFR § 60.3(a)(2)].
(Rev. 1) Addressed. Email, K. Maybury: "Joint Permit has been issued. It is Permit # 16-0015. I
will bring a copy to our pre -construction meeting." [3/4/2016 3:40 PM]
Prepare and complete FEMA Elevation Certificate for proposed structure (Attached).
[http://www.fema.gov/media-library-data/20130726-1437-20490-3457/f 053_elevationcertificate_janl3.pdf ]
(Rev. 1) Withdrawn.
Provide PE -seal `No Rise' Certification. Example,
[from: http://www.fema.gov/media-library-data/20130726-1535-20490-4864/unit5.pdf p. 23] (Rev. 1)
Partially Addressed. As follow-up:
`No Rise' Certification (sheet C-1) is blank except for date/signature. Certification should exist as
printable independent document. The form was a guide to be completed. Please prepare (separate)
`No Rise' Certification that reads:
This is to certify that I am a duly qualified registered professional engineer licensed to practice in the
State of Virginia.
It is further to certify that the attached technical data supports the fact that proposed Doyles River
Crossing will not impact 100 -year flood elevations or widths at unpublished cross-sections in the
vicinity of the proposed development, located at Approx. N 38° 11' 02.9" W 78° 40' 11.1" in
Albemarle County, VA (Application packet, Appx C/ FEMA FIRM Map Number 51003CO100D).
Attached are the following documents that support my findings:
Nov -5 2015 Letter of Application (Floodplain Development Permit/FDP201500008) that includes
Appendices A, B, C, D, E; Appendix D, rev. 02-12-2016; and Doyles River Crossing Plans, rev. 02-
12-2016 (Wm. S. Moore, PE). All items on file with Albemarle County.
Please seal/sign-date/scan/email to reviewer—send ori ing al to: County of Albemarle, Department of
Community Development, 401 McIntire Rd, Charlottesville, VA 22902.
Stream Crossine:
1. Provide plan schematic of ESC measures required to: remove existing crossing (with cofferdams);
construct proposed crossing (with cofferdams); store materials above 10 -yr stream stage elevation.
(Rev. 1) Addressed. ESCP approved 27 Feb 2016.
2. Mitigation plantings are required in areas available once existing crossing is removed; 2:1 ratio is
unlikely. Provide Mitigation Plan —plant QTY/schedule (buffer, orange, image below). [17-604.C.5.]
(Rev. 1) Addressed. Mitigation Plan approved with ESCP, 27 Feb 2016.
3. Recommend labels make explicit that at least one culvert is to be countersunk 6" below stream bed.
(Rev. 1) Addressed.
Please call if any questions.
Thank you
File: FDP201500008_Doyles River Crossing_030416rev1