Engineering Services RFP - PEC VDOT Rappahannock Fish-Passage Pilot Project - Piney River

PIEDMONT ENVIRONMENTAL COUNCIL (PEC)
VDOT Rappahannock Fish-Passage Pilot Project - Piney River
Engineering Services
REQUEST FOR PROPOSALS
June 26, 2020
RFP SUMMARY:
I. PROJECT BACKGROUND
II. SCOPE OF SERVICES
III. PROPOSAL OUTLINE
IV. PROPOSAL EVALUATION
V. PROPOSAL TIMELINE
VI. EXHIBIT A: Pilot Project Map and Photos for Piney River/Rt. 653
VII. EXHIBIT B: Existing Conditions of VDOT infrastructure, Piney River/Rt. 653
VIII.EXHIBIT C: Contech Bottomless Arch Culvert conceptual design, Piney River/Rt. 653
IX. EXHIBIT D: VDOT Drainage Manual (2019), Chapter 8.3 “Culverts”, Chapter 12 “Riverine
Analysis”
X. EXHIBIT E, Proof of Authority to Transact Business in Virginia, must be completed and returned
with your proposal.
XI. EXHIBIT F, Proof of Insurance, must be A VERIFIED COPY OF INSURANCE CERTIFICATE, returned
with your proposal.
CLOSING DATE: FRIDAY, JULY 24, at 5:00 PM
ALL BIDS MUST BE RECEIVED BY THE CLOSING DATE TO BE CONSIDERED. One electronic copy of each
proposal, including all attachments, exhibits, etc. must be summarized as a single document (PDF or
Word) and electronically mailed to Claire Catlett at ccatlett@pecva.org
For technical information regarding this RFP, please contact:
Claire Catlett, Land Conservation Field Representative Email: ccatlett@pecva.org
Piedmont Environmental Council Office phone: (540) 347-2334 x7060
45 Horner Street Cell phone: (540) 935-7677
Warrenton, VA 20186
In compliance with this Request for Proposal and all the conditions imposed herein, the undersigned
offers and agrees to furnish the services in accordance with the signed proposal or as mutually agreed
upon by subsequent negotiations. PLEASE COMPLETE AND SIGN PAGE 1 WITH YOUR SUBMISSION.
Company Name: __________________________________________________________________
Address: _________________________________________________________________________
Phone: __________________________________ Email: _____________________________
FEIN/SSN: ________________________________ DUNS: _____________________________
Name: ___________________________________ Title: ______________________________
Signature: _________________________________ Date: ______________________________

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I. PROJECT BACKGROUND
PEC is one of the most effective community-based environmental groups in the country that has worked
since 1972 to promote and protect the natural resources, rural economy, history and beauty of the
Virginia Piedmont. As a 501-C(3) non-profit and accredited land trust, our work empowers citizens and
their communities of our nine-county region to conserve land, strengthen rural economies, celebrate
historic resources, protect air and water quality, build smart transportation networks, promote
sustainable energy choices, restore wildlife habitat, and improve people’s access to nature.
PEC believes that the most important resource that our communities share is clean water. PEC is
restoring trout streams in Virginia’s Piedmont to connect fish passage and restore water quality.
Eastern brook trout are an indicator species for water quality because they need cold, clean water to
survive, and also have become a charismatic species for headwater stream health. As a land trust and
non-profit, PEC uniquely works on collaborative initiatives with public and private landowners as
conservation partners, and has extended our work for trout stream restoration in the Upper
Rappahannock watershed (includes Rappahannock, Orange, Madison, and Greene County).
As of 2019, PEC, VDOT and U.S. Fish and Wildlife Service (USFWS) are working together to complete two
pilot projects for trout stream restoration in Rappahannock County. VDOT and PEC have selected two
pilot projects at public road-stream crossing locations at Piney River (VA Rt. 653) and Bolton Branch (VA
Rt. 631) during the project timeline of 2020-2021. PEC has secured the projects’ funds through several
federal grants, and will rely on VDOT and USFWS to lead the project’s scope of work with their expertise
and technical assistance.
II. SCOPE OF SERVICES
PEC seeks to secure contracted professional engineering services to complete (1) a Geotechnical Report
and (2) a Final Design for fish-friendly and flood-resilient structures to replace culverts at ONLY the Piney
River (VA Rt. 653) pilot project site in Rappahannock County, VA. The selected engineering firm will have
experience in stream restoration and VDOT transportation engineering, as well as hold an engineering
license in Virginia. This RFP will ensure competitive costs for PEC and all partners, and meet federal
funding guidance, as given by the OMB Circular.
The pilot project included in the Scope of Services in this RFP will be the stream culvert-crossing
replacement located at Piney River, on Sycamore Ridge Rd. (VA Rt. 653), near Sperryville, VA
(38.694270, -78.259068). This project is located on VDOT Right-of-Way.
A 30% conceptual design, hydraulic analysis, stream surveys, and site mapping has been completed in
the first phase of this project by USFWS. The selected engineering firm will complete the final design for
Piney River, with targeted construction dates of spring 2021 (see Project Timeline below). The selected
engineering contractor will complete the associated tasks (see below).
The selected engineering firm will use existing conditions calculations for hydrology and preliminary
designs completed by USFWS to recommend a final design for Piney River. PEC and VDOT have
developed a MOA to indicate this project’s scope of work, timeline, as well as procedures for payment
and exchange of services.

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Please see Exhibit A for project map. Exhibits B details existing conditions of VDOT infrastructure at
Piney River. Exhibit C details an example of a fish-friendly, full aquatic organism passage (AOP) structure-
- a bottomless-arch culvert-- to replace the existing structure at Piney River. Exhibit D includes VDOT
Drainage Manual (2015) sections for countersinking culverts and fish-passage.
An Engineering Contract will include the following tasks for a Final Design, Site Plan (as required by
VDOT), and an As-Built Survey, but are not limited to:
A. Preliminary Design Review: USFWS has completed stream surveys and existing conditions
hydraulic analysis at the Piney River project. A USFWS conceptual design has developed a full
Aquatic Organism Passage (AOP) solution at Piney River. The selected engineering firm will
review these preliminary design documents in preparation of a final design, and/or any design
alternatives for Piney River. An example for a full-AOP, bottomless-arch culvert fabrication for
Piney River is attached (Exhibit E). The engineering firm will provide the following services as a
completed preliminary design review:
● preliminary soils survey and pavement investigation survey
● preliminary roadway approach design - Preliminary Field Inspection/PFI level (ROW and
easements labeled, impacts to utilities and property owners defined, etc.)
● concept structure layout and construction phasing with a Stage I Report and preliminary
engineers cost estimate
● Preliminary Maintenance of Traffic/MOT plans and time estimate of traffic impacts
during construction (maybe alternatives for MOT since on dead end road)
● Preliminary river hydraulic analysis including existing and proposed conditions hydraulic
modeling (HEC-RAS) for VDOT review and approval.
B. Geotechnical Services & Report: Engineering contractor will secure geotechnical services and a
report, inclusive of the following tasks (but not limited to):
● Public and private utility identification
● subsurface exploration, including borings field engineering and soil samples
● groundwater surveys
● recommendations regarding preparation of subgrades
● evaluation of on-site soil, including compaction criteria and excavation techniques
● foundation design
● on-site testing during construction
● a final report that summarizes completed work as a Site Vicinity Map, Location Plan, and
Summary of Lab Tests.
C. Final Design/ Site Plan: Engineering contractor will provide a 100% set of construction plans
including the relevant engineering analyses and calculations at Piney River. The final design
issued for the final construction plans will include all information necessary for the successful
construction of the proposed practices including:
● right-of-way and construction plans

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● structure and bridge design (final plans, construction specifications, estimate and special
provisions)
● final roadway approach design
● survey, including preliminary and final land acquisition R/W plats
● hydrologic design (including erosion and sediment control design)
● Final river hydraulic analysis (including scour analysis) in a signed and sealed report.
● No adverse impact statement VDOT form LD293 & LD294 (needed for permitting)
● traffic engineering design, (including sign, signal, pavement marking plans)
● geotechnical foundation analysis and design
● traffic management plans (TMP)
● development of live load ratings
● permit sketches
● Contract Time Determination Reviews/CTDR (2 alternatives - 1 for normal work hours
and 1 with accelerated or multiple crews working to develop incentive) with specified
duration to traffic impacts
D. Permitting Compliance: VDOT will apply for all project permits, and the selected engineer will
provide associated project coordination to VDOT during all permitting applications,
administration, and close-out tasks.
E. As-built Survey: After the construction at the Piney River project is completed, the engineering
contractor will conduct an as-built survey that may include:
● in-stream features
● road-stream crossing structures
● associated landscaping
● a profile with monumental cross-sections
● load ratings
● and photographic monitoring stations
● As-Built river hydraulic analysis if significant deviations from the design plans are
discovered in the roadway profile or the in-stream structure elevations.
F. Construction Support Services: The engineer will review all work completed during
construction, and document that all project components have been installed according to the
final plans. The engineer will additionally provide design support during construction including,
but not limited to:
● attending partnering and other construction related meetings
● attending partner presentations showcasing pilot project
● formal plan revisions (not related to design error)
● prompt design reviews and revisions to prevent work order claims, participation in
construction value engineering and constructability reviews
● shop drawing reviews, review of contractor’s working drawings and responding to
contractor inquiries
● provide as-built plans and load rating

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● reference points, markers, and offsets to guide construction
G. Warranty: PEC will negotiate a warranty for all engineering/design work associated with each
project’s final design, and such warranty will be approved by VDOT per terms identified in the
PEC-VDOT MOU.
III. PROPOSAL OUTLINE
The following information and clarification is provided to assist in the preparation of the
proposal:
a. Qualifications of offeror: The offeror must be fully qualified to perform the described
services for the scope of work as described herein. Preference will be given to offerors with
demonstrated experience with stream restoration and bridge installation project work. The
offeror must submit at least three (3) samples of relevant related work history of similar
scope, size and complexity that has been completed in the past two years. Offeror shall
submit copies of Professional Engineering Licenses for those individuals responsible for
signing and sealing the plans and engineering reports.
b. Offerors are to submit written proposals that present the offeror’s qualifications and
understanding of the work to be performed. The offeror’s proposal should be prepared
simply and economically and should provide all the information which it considers pertinent
to its qualifications for the project and which respond to the Project Background and Scope
of Services criteria listed herein. Emphasis should be placed on completeness of services
offered and clarity of content.
c. Any questions related to this Request for Proposal should be submitted in writing or via
email to the Point of Contact listed on the first page no later than May 30, 2020. This will
allow for adequate time to respond to the question and to notify all bidders of the answer.
d. If subcontractors or business partners will be used during the performance of this contract,
they must be identified in the proposal.
e. The offeror is responsible for all costs incurred in the development and submission of the
proposal.
f. EXHIBIT G, Proof of Authority to Transact Business in Virginia, must be completed and
returned with your proposal.
g. EXHIBIT H, Proof of Insurance, must be completed and returned with your proposal.
IV. PROPOSAL EVALUATION
All qualified proposals will be evaluated by the Piedmont Environmental Council (PEC) and Virginia
Department of Transportation (VDOT) using the following criteria:
● Specific plan or methodology to be used to perform the services
● Experience and qualifications of personnel assigned to perform the services: The proposal
must identify the project manager, specific names of persons assigned to conduct the tasks,
and qualifications of the individuals. Do not include firm accomplishments unless persons
assigned to work on this proposal were part of those projects.
● Proposed time frame and ability to perform the services: Offeror should provide a timeline
for completion of the project from start to finish within the firm’s existing work load.

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● Ability to work closely with PEC, USFWS and VDOT’s designated representative: The Offeror
will be required to work closely with the PEC’s designated project manager, as well as the
project partners, including VDOT and USFWS.
● Understanding of the project: Offeror should include a description of their understanding of
the project in the narrative provided as part of their proposal.
V. Competitive cost (as a Project Budget): All bids will be comparatively assessed for competitive
costs.
VI. PROJECT TIMELINE
TASK MILESTONE
RFP posted JUNE 26, 2020
Deadline for submission of questions about RFP JULY 17, 2020
PROPOSALS DUE/Receive proposals JULY 24, 2020
Award contract JULY 31, 2020
Begin contract AUGUST 7, 2020
Project construction APRIL 2021 (Piney R.)
Project completion MAY 1, 2021
Final billing MAY 15, 2021

EXHIBIT A: Pilot Project Map and Photos for Piney River/Rt. 653

Structure #306
Shenandoah
National
Park
PickeralRidgeLn
Hull School Rd
SycamoreRidgeRd
Swindler Hollow
Rd
N
o r t h
F
ork
ThorntonRiver
P
i n
e y
R
i v
e r
Thompson
56
Nelson
61
Ringer
101
6
6
Atkins
1
Johnston
51
Johnston
6
Snay
2
Rowlett
2
Wilson
2
Kirby
1
Hager
20
Burke
12
Ubelaker
29
Tuttle
49
Lynch
28
Elkins
1
Biby
9
Parsons
3
Clatterbuck
4
Heller
40
Burney
53
Miller
9
Boelte
11
Heller
2
Mathison
85
Stone
89
6
8
4
94
2
1
6
2
9
83
72Piney
River
0 500 1,000
Feet
q
Map created by PEC for presentation purposes only.
Data source: County Governments, the Virginia Department of Conservation and
Recreation, the Virginia Department of Historic Resources, the Virginia Base
Mapping Program, the National Wetland Inventory, American Battlefield Protection
Program and the National Hydrology Dataset. Although efforts have been made
to verify data, accuracy is not guaranteed.
April 20, 2017 | Warrenton | JWR
Virginia Scenic Road
Wetland
Flood Zones FEMA
Conservation Easements
Publicly Owned Land
Historic Districts
River / Streams
Intermittent Streams
!
Warrenton
!
Culpeper
!
Front Royal
!Washington
!
Manassas
FAUQUIER
RAPPAHANNOCK
CULPEPER
WARREN
LOUDOUN
PRINCE
WILLIAM
STAFFORDMADISON
FREDERICK
FAIRFAX
Leesburg
!
Madison
Area of Detail
!
!
Winchester
!
Berryville
VDOT
#306
Sycamore Ridge Rd./
Rt. 653
38.694270, -78.259068

EXHIBIT B: Existing Conditions of VDOT infrastructure,
Piney River/Rt. 653

EXHIBIT C: Contech Bottomless Arch Culvert conceptual design,
Piney River/Rt. 653

9025 Centre Pointe Dr.
West Chester, OH 45069
800-338-1122
www.ContechES.com
© 2012 Contech Engineered Solutions LLC
ENGINEERED SOLUTIONS
• Over 7,000 installations since 1976
• Spans to 35 ft
• Wide-span, low-rise structures
• Ideal for small bridge replacements
• Variety of shapes and sizes
• Lightweight
• Fast, easy, low cost installation
• Suitable for rehabilitation
• Extensive technical support
• Economical solution
Aluminum Box Culvert - stream crossing
Aluminum Box Culvert - county road bridge
Aluminum Box Culvert - multi-cell installation
Aluminum Box Culvert - stream crossing
Aluminum Box Culvert
Aluminum Box Culvert - aesthetic finish
Plate

Contech Engineered Solutions LLC
9025 Centre Pointe Drive, Suite 400
West Chester, OH 45069
Phone: (513) 645-7000
Fax: (513) 645-7993
www.ContechES.com
March 16, 2020
Project: Culvert Crossing, Huntly VA (DYOB REFERENCE #216834)
Jessica Pica
US Fish and Wildlife Service
300 Westgate Center Drive
Hadley, MA 01035
As requested, the following is a Contech Aluminum Box Culvert System ENGINEER’S COST ESTIMATE for the above
referenced project. This ESTIMATE is intended for preliminary estimating purposes only and should not be interpreted as
a final QUOTATION. The information presented is based on the DYOB referenced above.
Contech will fabricate and deliver the following described Aluminum Box Culvert System components and appurtenances:
DESCRIPTION OF SUPPLIED MATERIALS:
§ Contech Aluminum Box Culvert Structure Number 82
§ 18.25 L.F. of Structure Number 82, 25'-2" Span x 6'-2" Rise Aluminum Box Culvert
§ Shell Designation = E6
§ Two (2) Aluminum headwalls with anchors and connection hardware
§ Four (4) Aluminum wingwalls with deadman anchors and connection hardware
*ESTIMATE - $32,500 Delivered
These costs do not include the foundation, or installation costs. As part of the construction process, the contractor is to
perform the items listed below in accordance with the installation drawings:
§ Construct cast-in-place foundations (if applicable)
§ Unload materials at jobsite location
§ Assemble the plates
§ Excavate and backfill the structure
Please contact me at *Sender Phone* should you have any questions or need additional information. Thank you for your
interest in the Contech Aluminum Box Culvert System.
Respectfully,
Tom Hennessey
774-402-0312
*Sender Signature*
*Estimate assumes production facility is within 434 miles of the jobsite.
This estimate was prepared using a number of assumptions for design
loads, earth cover, freight and other considerations. Sales tax, if
applicable is not included. Contact your local Contech representative
to request a formal quotation.

STRUCTURAL PLATE
DRAWING
DYOB800-338-1122 513-645-7000 513-645-7993 FAX
9025 Centre Pointe Dr., Suite 400, West Chester, OH 45069
The design and information shown on this drawing is provided
as a service to the project owner, engineer and contractor by
Contech Engineered Solutions LLC ("Contech"). Neither this
drawing, nor any part thereof, may be used, reproduced or
modified in any manner without the prior written consent of
Contech. Failure to comply is done at the user's own risk and
Contech expressly disclaims any liability or responsibility for
such use.
If discrepancies between the supplied information upon which
the drawing is based and actual field conditions are encountered
as site work progresses, these discrepancies must be reported
to Contech immediately for re-evaluation of the design. Contech
accepts no liability for designs based on missing, incomplete or
inaccurate information supplied by others.
www.ContechES.com
ALBC 82, 25'-2" Span x 6'-2" Rise
Shell Designation = E6
Culvert Crossing
Huntly, Virginia
CHECKED:
DRAWN:DESIGNED:
APPROVED:
DATE:PROJECT No.:
DYO216834 3/16/2020
DYO DYO
DYO DYO
PRELIMINARY
NOT FOR CONSTRUCTION
REVISION DESCRIPTIONDATEMARK BY COVER SHEET
CONTECH ALBC DYOB

18'-3"(OUT TO OUT)
25'-2"SPAN
9'-0"W
W
3
2
PAN
EL(S)
45°
9'-0"W
W
4
2
PAN
EL(S)
45°
31'-6"HEADWALL
9'-0"W
W
1
2
PAN
EL(S)
45°
9'-0"W
W
2
2
PAN
EL(S)
45°
31'-6"HEADWALL
0 2' 4' 8'
AA
C STRUCTUREL
BRIDGE PLAN
FLOW
STRUCTURAL PLATE
DRAWING
DYOB800-338-1122 513-645-7000 513-645-7993 FAX
such use.
www.ContechES.com
ALBC 82, 25'-2" Span x 6'-2" Rise
Culvert Crossing
Huntly, Virginia
CHECKED:
DRAWN:DESIGNED:
APPROVED:
SHEET NO.:
OF
DATE:PROJECT No.:
6
DYO216834 3/16/2020
DYO DYO
DYO DYO
PRELIMINARY
REVISION DESCRIPTIONDATEMARK BY 1

25'-2" SPAN
6'-21
4"
RISE
3'-0"
10'-2"
3'-0"
10'-2"
31'-6" HEADWALL
0 2' 4' 8'
INLET END ELEVATION
STRUCTURAL PLATE
DRAWING
DYOB800-338-1122 513-645-7000 513-645-7993 FAX
such use.
www.ContechES.com
ALBC 82, 25'-2" Span x 6'-2" Rise
Culvert Crossing
Huntly, Virginia
CHECKED:
DRAWN:DESIGNED:
APPROVED:
SHEET NO.:
OF
DATE:PROJECT No.:
6
DYO216834 3/16/2020
DYO DYO
DYO DYO
25'-2" SPAN
6'-21
4"
RISE
3'-0"
10'-2"
3'-0"
10'-2"
31'-6" HEADWALL
0 2' 4' 8'
OUTLET END ELEVATION PRELIMINARY

STRUCTURAL PLATE
DRAWING
DYOB800-338-1122 513-645-7000 513-645-7993 FAX
such use.
www.ContechES.com
ALBC 82, 25'-2" Span x 6'-2" Rise
Culvert Crossing
Huntly, Virginia
CHECKED:
DRAWN:DESIGNED:
APPROVED:
SHEET NO.:
OF
DATE:PROJECT No.:
6
DYO216834 3/16/2020
DYO DYO
DYO DYO
18'-3"(OUT TO OUT)
3'-0"
10'-2"
3'-0"
10'-2"
0 2' 4' 8'
SECTION A-A
25'-2" SPAN
6'-21
4"
RISE
0 2' 4' 8'
CROSS SECTION
PRELIMINARY

ADDITIONAL SELECT GRANULAR STRUCTURAL BACKFILL NOTES:
SATISFACTORY BACKFILL MATERIAL, PROPER PLACEMENT, AND COMPACTION ARE KEY
FACTORS IN OBTAINING MAXIMUM STRENGTH AND STABILITY.
THE BACKFILL MATERIAL SHOULD BE FREE OF ROCKS, FROZEN LUMPS, AND FOREIGN
MATERIAL THAT COULD CAUSE HARD SPOTS OR DECOMPOSE TO CREATE VOIDS. BACKFILL
MATERIAL SHOULD BE WELL GRADED GRANULAR MATERIAL THAT MEETS THE REQUIREMENTS
OF AASHTO M-145 FOR SOIL CLASSIFICATIONS A-1, A-2-4, A-2-5, OR A-3 MODIFIED.
SEE THE STRUCTURAL PLATE BACKFILL GROUP CLASSIFICATION TABLE ON THIS SHEET.
BACKFILL MUST BE PLACED SYMMETRICALLY ON EACH SIDE OF THE STRUCTURE IN 8" LOOSE
LIFTS. EACH LIFT IS TO BE COMPACTED TO A MINIMUM OF 90% DENSITY PER AASHTO T-180.
A HIGH PERCENTAGE OF SILT OR FINE SAND IN THE NATIVE SOILS SUGGESTS THE NEED FOR A
WELL GRADED GRANULAR BACKFILL MATERIAL TO PREVENT SOIL MIGRATION. IF THE
PROPOSED BACKFILL IS NOT A WELL-GRADED MATERIAL, A NON-WOVEN GEOTEXTILE FILTER
FABRIC SHALL BE PLACED BETWEEN THE SELECT BACKFILL AND THE IN SITU MATERIAL.
DURING BACKFILL, ONLY LIGHTWEIGHT TRACKED VEHICLES (D-4 OR LIGHTER) SHOULD BE NEAR
THE STRUCTURE AS FILL PROGRESSES ABOVE THE CROWN AND TO THE FINISHED GRADE.
THE ENGINEER AND CONTRACTOR ARE CAUTIONED THAT THE MINIMUM COVER MAY NEED TO
BE INCREASED TO HANDLE TEMPORARY CONSTRUCTION VEHICLE LOADS
(HEAVIER THAN D-4).
SELECT GRANULAR STRUCTURAL BACKFILL LIMITS.
INITIAL LIFTS OVER THE CROWN OF STRUCTURE AS
INDICATED BY SHADED AREA TO BE COMPACTED TO
REQUIRED DENSITY WITH HAND OPERATED EQUIPMENT
OR WITH LIGHTWEIGHT(D-4 OR LIGHTER) EQUIPMENT.
NOTES:
1. ALL SELECT GRANULAR BACKFILL TO BE PLACED IN A BALANCED
FASHION IN THIN LIFTS (8" LOOSE TYPICALLY) AND COMPACTED TO
90 PERCENT DENSITY PER AASHTO T-180.
2. COMPLETE AND REGULAR MONITORING OF THE ALUMINUM BOX CULVERT
SHAPE IS NECESSARY DURING ALL BACKFILLING OF THE STRUCTURE.
3. PREVENT DISTORTION OF SHAPE AS NECESSARY BY VARYING COMPACTION
METHODS AND EQUIPMENT.
4. TRENCH WIDTH OTHER THAN 3 FEET SHALL BE BY DIRECTION OF THE
ENGINEER OF RECORD.
5. SWITCH TO PLACING SELECT GRANULAR BACKFILL NEAR IN RADIAL
LIFTS THE MIDDLE OF THE HAUNCH CURVE.
GROUP CLASSIFICATION A-1-a A-1-b A-2-4 A-2-5 A-3
Sieve Analysis Percent Passing
No. 10 (2.000 mm) 50 max. ---- ---- ---- ----
No. 40 (0.425 mm) 30 max. 50 max. ---- ---- 51 max.*
No. 200 (0.075 mm) 15 max. 25 max. 35 max. 35 max. 10 max.
Atterberg Limits for Fraction Passing No. 40 (0.425 mm)
Liquid Limits ---- ---- 40 max. 41 min. ----
Plasticity Index 6 max. 6 max. 10 max. 10 max. Non Plastic
Usual Materials
Stone Fragment,
Gravel and Sand
Silty or Clayey
Gravel and Sand
Coarse
Sand
*Modified from M-145.
Fine beach sands, windblown sands, stream deposited sands, etc., exhibiting fine, rounded particles and typically
Classified by AASHTO M-145 as A-3 materials should not be used.
Reference the most current version of ASTM D2487, Standard Practice for Classification of Soils for Engineering
Purposes (Unified Soil Classification System), for comparable soil groups.
STRUCTURAL PLATE BACKFILL GROUP CLASSIFICATION, REFERENCE AASHTO M-145
1.0 STANDARDS AND DEFINITIONS
1.1 STANDARDS - All standards refer to the current ASTM/AASHTO edition
unless otherwise noted.
1.1.1 ASTM B-864 "Standard Specification for Corrugated Aluminum Box Culverts"
(AASHTO Designation M-219).
1.1.2 AASHTO Standard Specification for Highway Bridges - Section 12
Division I - Design, AASHTO LRFD Bridge Design Specifications
Section 12.
1.1.3 AASHTO Standard Specification for Highway Bridges - Section 26
Division II - Construction, AASHTO LRFD Bridge Construction
Specifications - Section 26. ASTM B789, Standard Practice for
Installing Corrugated Aluminum Structural Plate Pipe.
1.2 DEFINITIONS
1.2.1 Owner - In these specifications the word "Owner" shall mean
.
1.2.2 Engineer - In these specifications the word "Engineer" shall mean
the Engineer of Record or Owner's designated engineering representative.
1.2.3 Manufacturer - In these specifications the word "Manufacturer"
shall mean CONTECH ENGINEERED SOLUTIONS 800-338-1122
.
1.2.4 Contractor - In these specifications the word "Contractor" shall
mean the firm or corporation undertaking the execution of any
installation work under the terms of these specifications.
1.2.5 Approved - In these specifications the word "approved" shall refer to
the approval of the Engineer or his designated representative.
1.2.6 As Directed - In these specifications the words "as directed" shall refer to
the directions to the Contractor from the Owner or his designated
representative.
2.0 GENERAL CONDITIONS
2.1 Any installation guidance provided herein shall be endorsed by the
engineer; discrepancies herein are governed by the Engineer's plans and
specifications.
2.2 The Contractor shall furnish all labor, material and equipment and
perform all work and services except those set out and furnished by the
Owner, necessary to complete in a satisfactory manner the site
preparation, excavation, filling, compaction, grading as shown on the
plans and as described therein. This work shall consist of all mobilization
clearing and grading, grubbing, stripping, removal of existing material
unless otherwise stated, preparation of the land to be filled, filling of the land,
spreading and compaction of the fill, and all subsidiary work necessary to
complete the grading of the cut and fill areas to conform with the lines,
grades, slopes, and specifications. This work is to be accomplished under
the observation of the Owner or his designated representative.
2.3 Prior to bidding the work, the Contractor shall examine, investigate and
inspect the construction site as to the nature and location of the work, and
the general and local conditions at the construction site, including without
limitation, the character of surface or subsurface conditions and obstacles
to be encountered on and around the construction site and shall make
such additional investigation as he may deem necessary for the planning
and proper execution of the work.
If conditions other than those indicated are discovered by the Contractor,
the Owner shall be notified immediately. The material which the
Contractor believes to be a changed condition shall not be disturbed so
that the owner can investigate the condition.
2.4 The construction shall be performed under the direction of the Engineer.
2.5 All aspects of the structure design and site layout including foundations,
backfill, end treatments and necessary scour consideration shall be
performed by the Engineer.
LIMITSOFCOMPACTED
ACCEPTABLEROADFILL
SPAN
RISE
MIN.COVER
TRENCH CONDITION MIN. 3 FEET
ROADFILL ABOVE
MIN. COVER LEVEL
EMBANKMENT
CONDITION
MIN. 3 FEET
MINIMUM LIMITS OF COMPACTED SELECT
GRANULAR STRUCTURAL BACKFILL
8"
LOOSE LIFTS
SECTION
CL
NATURAL
UNDISTURBED
EMBANKMENT
3.0 ASSEMBLY AND INSTALLATION
3.1 Bolts and nuts shall conform to the requirements of ASTM A-307
and/or ASTM A-449. The box culvert shall be assembled in
accordance with the plate layout drawings provided by the
manufacturer and per the manufacturer's recommendations.
Bolts shall be tightened using an applied torque of between 100
and 150 ft.-lbs.
3.2 The box culvert shall be installed in accordance with the plans
and specifications, the manufacturer's recommendations, and
AASHTO Standard Specification for Highway Bridges - Section
26 Division II - Construction/AASHTO LRFD Bridge Construction
Specifications - Section 26.
3.3 Trench excavation shall be made in embankment material that is
structurally adequate. The trench width shall be shown on the
plans. Poor quality in situ embankment material must be removed
and replaced with suitable backfill as directed by the Engineer.
3.4 Aluminum Box Culvert designs require a minimum allowable
soil-bearing pressure of 4,000 psf. Lower bearing capacities may be
accommodated with a site specific design for an aluminum
foundation or a concrete footing.
If the engineer determines the natural foundation is inadequate to
support the structure's backfill, the poor material shall be excavated,
removed and replaced to a suitable depth with competent
material. The specific depth of excavation required may be reduced
by utilizing a geosynthetic reinforced foundation as designed by a
qualified geotechnical engineer. For additional information contact
your local Contech representative.
3.5 When a metal foundation is used, the soil bedding requires a
minimum of 6 inches of loose granular material with a maximum
particle size of one half the corrugation depth. The proper width of
the bedding material required shall conform to the project plans
and specifications.
Bedding preparation is critical to both structure performance and
service life. The bedding should be constructed to uniform line and
grade to avoid distortions that may create undesirable stresses in
the structure and/or rapid deterioration of the roadway. The bed
should be free of rock formations, protruding stones, frozen lumps,
roots, and other foreign matter that may cause unequal settlement.
3.6 The structure shall be assembled in accordance with the
Manufacturer's instructions. All plates shall be unloaded and
handled with reasonable care. Plates shall not be rolled or dragged
over gravel rock and shall be prevented from striking rock or other
hard objects during placement in trench or on bedding.
When installed on a full invert or on flexible footing pads, assembly
of the invert or footing pads shall start at the downstream end.
Circumferential seam laps shall shingle over the top of the
downstream plates as assembly progresses upstream. Whether
the box culvert is installed on a concrete footing, full metal invert,
or flexible footing pad, assembly of the structure shell shall start at
the upstream end. Downstream rings of plates shall be assembled
outside of the upstream rings (Circumferential seams are shingled
downstream when viewed from the inside of the shell).
3.7 The structure shall be backfilled using clean well graded granular
material that meets the requirements for soil classifications A-1,
A-2-4, A-2-5, or A-3 modified per AASHTO M-145. See the
structural plate backfill group classification table on this sheet.
Backfill must be placed symmetrically on each side of the
structure in 8 inch loose lifts. Each lift shall be compacted to a
minimum of 90 percent density per AASHTO T-180.
3.8 Standard highway loads that meet the permissible design load
limits for an Aluminum Box Culvert are not allowed on the structure
until it is backfilled completely and pavement is in place.
The addition of temporary soil for heavy construction loads is not
feasible or permissible for Aluminum Box Culverts. By design,
these structures are limited in the range of permissible fill heights
and live loads.
Heavy construction loads that exceed that of the particular
highway live load design limits are not allowed on Aluminum Box
Culverts without approval from the Engineer.
3.9 If an aluminum headwall and/or wingwall system is specified, the
select granular structural backfill limits shall extend past the
deadman anchor system. Contact the Engineer if stiff material or
rock is encountered where the wingwalls and deadmen are to be
installed.
STRUCTURAL PLATE
DRAWING
DYOB800-338-1122 513-645-7000 513-645-7993 FAX
such use.
www.ContechES.com
ALBC 82, 25'-2" Span x 6'-2" Rise
Culvert Crossing
Huntly, Virginia
CHECKED:
DRAWN:DESIGNED:
APPROVED:
SHEET NO.:
OF
DATE:PROJECT No.:
6
DYO216834 3/16/2020
DYO DYO
DYO DYO

STRUCTURAL PLATE
DRAWING
DYOB800-338-1122 513-645-7000 513-645-7993 FAX
such use.
www.ContechES.com
ALBC 82, 25'-2" Span x 6'-2" Rise
Culvert Crossing
Huntly, Virginia
CHECKED:
DRAWN:DESIGNED:
APPROVED:
SHEET NO.:
OF
DATE:PROJECT No.:
6
DYO216834 3/16/2020
DYO DYO
DYO DYO
SAMPLE PARTIAL FOUNDATION PLAN
(NOT PROJECT SPECIFIC)
SAMPLEDRAWINGONLY EXPRESS FOUNDATIONS
C STRUCTUREL
A
KEYWAY
1
2" JOINT
6"
ADETAIL
1
SECTION
RISE
SPAN
FOUNDATION WIDTH
DETAIL 1
FOUNDATIONDEPTH
3"CLR.
1'-0" (TYP)
4"KEYWAY

STRUCTURAL PLATE
DRAWING
DYOB800-338-1122 513-645-7000 513-645-7993 FAX
such use.
www.ContechES.com
ALBC 82, 25'-2" Span x 6'-2" Rise
Culvert Crossing
Huntly, Virginia
CHECKED:
DRAWN:DESIGNED:
APPROVED:
SHEET NO.:
OF
DATE:PROJECT No.:
6
DYO216834 3/16/2020
DYO DYO
DYO DYO
C
B
N.T.S.
ARMORFLEX PARTIAL INVERT
PARTIAL LAYOUT PLAN
A
A
FLOW
2 UNIT
MIN.
N.T.S.
STANDARD TERMINATION C
N.T.S.
ARMORFLEX WINGWALL
TERMINATION B
N.T.S.
ARMORFLEX STRUCTURE TERMINATION A
N.T.S.
ARMORFLEX FULL INVERT
PARTIAL LAYOUT PLAN
C
B
A
A
E
N.T.S.
A-JACKS PARTIAL INVERT
PARTIAL LAYOUT PLAN
D
FLOW
N.T.S.
A-JACKS STRUCTURE
TERMINATION D
N.T.S.
A-JACKS WINGWALL
TERMINATION E
FLOW
C
6"MIN
6"MIN
OPTIONAOPTIONBOPTIONC
N.T.S.
A-JACKS PARTIAL INVERT
SAMPLEDRAWINGONLY

EXHIBIT D: VDOT Drainage Manual (2019), Chapter 8.3 “Culverts”,
Chapter 12 “Riverine Analysis”

EXHIBIT E, Proof of Authority to Transact Business in Virginia,
*must be completed and returned with your proposal.

PROOF OF AUTHORITY TO TRANSACT BUSINESS IN VIRGINIA
THIS FORM MUST BE SUBMITTED WITH YOUR BID/PROPOSAL. FAILURE TO INCLUDE
THIS FORM SHALL RESULT IN REJECTION OF YOUR BID/PROPOSAL
Pursuant to Virginia Code §2.2- 4311.2, a bidder/offeror organized or authorized to transact business in the
Commonwealth pursuant to Title 13.1 or Title 50 of the Code of Virginia shall include in its bid/ proposal the identification
number issued to it by the State Corporation Commission (“SCC”). Any bidder/offeror that is not required to be
authorized to transact business in the Commonwealth as a foreign business entity under Title 13.1 or Title 50 of the
Code of Virginia or as otherwise required by law shall include in its bid or proposal a statement describing why the offeror
is not required to be so authorized. Any bidder/offeror described herein that fails to provide the required information shall
not receive an award unless a waiver of this requirement and the administrative policies and procedures established to
implement this section is granted by the Purchasing Agent or his designee.
If this bid/proposal for goods or services is accepted by the County of Loudoun, Virginia, the undersigned agrees
that the requirements of the Code of Virginia Section 2.2-4311.2 have been met.
Please complete the following by checking the appropriate line that applies and providing the requested information.
PLEASE NOTE: The SCC number is NOT your federal ID number or business license number.
A._____ Bidder/offeror is a Virginia business entity organized and authorized to transact business in Virginia by the
SCC and such bidder’s/offeror’s Identification Number issued to it by the SCC is ______________________.
B._____ Bidder/offeror is an out-of-state (foreign) business entity that is authorized to transact business in Virginia
by the SCC and such bidder’s/offeror’s Identification Number issued to it by the SCC is _____________________.
C._____ Bidder/offeror does not have an Identification Number issued to it by the SCC and such bidder/offeror is
not required to be authorized to transact business in Virginia by the SCC for the following reason(s):
Please attach additional sheets of paper if you need to explain why such bidder/offeror is not required to
be authorized to transact business in Virginia.
________________________________________________________________
Legal Name of Company (as listed on W-9)
________________________________________________________________
Legal Name of Bidder/Offeror
_______________________________
Date
________________________________________________________________
Authorized Signature
________________________________________________________________
Print or Type Name and Title
45 Horner Street
Warrenton, VA 20186
www.pecva.org

EXHIBIT F: PROOF OF INSURANCE
NOTE TO APPLICANTS: A VERIFIED COPY OF INSURANCE CERTIFICATE MUST BE RETURNED WITH YOUR
PROPOSAL.

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