21.09.03 PSA Stolfus & AssociatesEXHIBIT B
On-Call Agreement for Professional Services
TASK ORDER 2
This Task Order pertains to the On-Call Agreement by and between the Town of Avon
(“TOWN”), and Stolfus and Associates (“CONTRACTOR”), dated On-Call Contract Execution
of September 3, 2021 (“the Agreement”). Task Order 2 is generally described as:
CONTRACTOR shall perform services as provided herein and in the Agreement. This Task
Order shall not be binding until it has been properly signed by both parties. Upon execution,
this Task Order shall supplement the Agreement as it pertains to the project described
below.
TASK ORDER NUMBER: 2
Project Description: Provide preliminary engineering and concept analysis for the US6
Multimodal Safety and Mobility Improvements project. The project received the CDOT
Revitalizing Main Street Grant to slow prevailing speed on US6 and potentially install 3
pedestrian crossings as shown on the project site below.
Project Site:
Proposed Tasks:
1. Sub-task 1. Understand and assess existing conditions and concerns.
2. Sub-task 2. Provide preliminary engineering analysis and design concepts.
Budget/Proposal: ___$124,548 ____________________________________
This Task Order is executed this __11th____ day of ___2021_________, YEAR.
Town of Avon
Recommended: _________Mobility Director___ Date: _Oct 13, 2021
Name Title
Stolfus and Associates
Approved: ___________________________________________________________________ Date: ______________
Name Title
Town of Avon
Approved: ___________________________________________________________________Date: ______________
Name Title
President 11/11/2021
5690 DTC Boulevard, Suite 330W
Greenwood Village, CO 80111
phone:303-221-2330 • fax: 303-221-2331
www.stolfusandassociates.com
November 3, 2021
Eva Wilson, PE, PTOE
Mobility Director
Town of Avon
EWilson@Avon.org
Dear Eva:
Please find below a proposed Scope of Services for Stolfus & Associates, Inc. (Stolfus) to conduct preliminary
engineering for a roundabout at US 6 and Stone Bridge Road and for three separate pedestrian crossings to
serve adjacent bus stops at River Edge Crossing, Eaglebend Crossing, and Mountain Stream Crossing. It is our
understanding that a mini-roundabout is desired at Stone Bridge Road. This scope of services will include traffic
and conceptual design analysis to confirm that a mini-roundabout is appropriate for the site and required design
criteria for the both the Town and CDOT. The pedestrian crossings are anticipated to include a median refuge,
ADA compliant sidewalk and curb ramp improvements to provide connectivity from the bus stops to the crossing,
and RRFB installations.
It is our understanding the project is funded through a Revitalizing Main Streets grant administered by CDOT and
will follow the CDOT Local Agency process. In addition, the project is located on a US Highway, so CDOT design
standards will apply. Compliance with CDOT Local Agency process, CDOT standards, and coordination with
CDOT staff is included in the scope of services.
The purpose of the preliminary engineering phase is to confirm layout of the proposed improvements, identify
potential impacts and required design elements, and update conceptual costs, as needed. Detailed design for
SUE, Utility Coordination, Drainage, Water Quality, Geotechnical, Pavement Design, Structures, SWMP,
Environmental, ROW, and Lighting is not included in this scope of services and will be incorporated as needed in
the second phase of the project for final design.
SCOPE OF SERVICES
The anticipated scope of services and deliverables for this project include:
1. Traffic Analysis and Conceptual Options for the Stone Bridge Roundabout
a. Traffic Memo summarizing roundabout operations
b. Exhibits for a mini-roundabout option
2. Survey and Existing ROW Verification
3. Preliminary Engineering
a. Preliminary (30%) Engineering Plans for the roundabout and 3 pedestrian crossings
b. Conduct a Preliminary Engineering Review meeting with CDOT (virtual)
4. Public Involvement Support
a. Exhibits for Town Staff to conduct public involvement activities
ELEMENTS OF THE SCOPE OF SERVICES
A. PROJECT MANAGEMENT
Stolfus will review and process invoices and provide other project administration/ management services
(coordination and product review) throughout the duration of the project. Stolfus will be responsible for day-to-day
management and coordination of the work elements. Monthly schedule, budget and project status reports will be
included in the invoices.
Eva Wilson, PE, PTOE
November 3, 2021
Page 2
Stolfus will create and maintain a project design schedule. The schedule will be updated as necessary during the
design process. Stolfus will notify the Town when tasks are falling behind schedule.
The following project team meetings are included in the scope of work:
• 1 – Kick-off/CDOT Scoping Meeting (virtual)
• 2 – Preliminary engineering progress meetings (virtual) (1- review concept design/traffic analysis, 2-
discuss other design issues)
• 1 – Preliminary Engineering review meeting (virtual)
Stolfus will be responsible for scheduling the meetings, preparing meeting exhibits, and participating in the
meetings. Meeting notes will be generated and distributed to the meeting attendees by Stolfus.
B. TRAFFIC ANALYSIS AND CONCEPT PHASE
Stolfus will collect traffic data and existing conditions. A peak hour turning movement count at the US 6 and Stone
Bridge Road intersection will be collected on a week day during the middle of the week. A site visit will confirm
existing lane and traffic control configurations at the Stone Bridge Road intersection and the three pedestrian crossing
locations, as well as potential constraints including ROW and utilities.
Traffic projections will be developed for a 20-year planning period using CDOT growth rates and any available
development information provided by the Town. Based on the data collected and the projections developed, an
operational analysis will be conducted using Rodel and HCM. SIDRA may be used for the purposes of verifying and
testing the sensitivity of the results. A level of service (LOS) and capacity analysis for AM and PM peak hour
conditions will be included. The analysis will provide the basis for the development of roundabout lane
configuration and horizontal design recommendations within available constraints. The analysis will provide an
understanding of the expected operational capacity based on the geometric design, to include: LOS, Delay, and
Queuing for the main street and minor street, overall intersection, and intersection approaches. LOS, delay, and
queuing analysis will be done for the existing condition and future twenty (20) year scenario. Based on the results
of the operational analysis, Stolfus will advise on a lane configuration to address traffic operations in the build-
year and the 20-yr design year. A memo will be prepared documenting the findings and recommendations.
Based on the traffic recommendations, a set of design criteria for a roundabout at this location will be developed and
submitted for review and concurrence. It is assumed that the design vehicle for turning movements will be a SU
vehicle given the residential uses off Stone Bridge Road. The design vehicle for through movements along US 6
will be a passenger vehicle for a mini-roundabout with accommodations for a WB-67 over the central island.
Stolfus will prepare a conceptual design accommodating 20-year design volumes, assumed to be a mini-
roundabout. Stolfus will look to apply current best practices in roundabout design. Plan development will be
based on site conditions, AASHTO, ITE, NCHRP Report 672, and MUTCD guidance, CDOT standards, and
engineering judgment. Conceptual design will only include horizontal layouts. Turning movements will be
investigated. Exhibits for the concept will be prepared on 11X17 and will be conceptual in nature, not developed
for construction. A review meeting will be held with the Town and CDOT to confirm the concept and to obtain
authorization to proceed with the preliminary engineering phase.
C. PRELIMINARY ENGINEERING
Based on the conceptual design developed in Item B, horizontal and vertical control for the Stone Bridge
roundabout will be prepared. Up to 9 horizontal and vertical alignments are anticipated, including intersection
return and panline profiles along the curb lines. Side slopes are anticipated to be accomplished through
maximum 3:1 slopes. If 3:1 slopes cannot be achieved without impacting adjacent residential properties and/or
the Eagle River, walls will be identified and general height expectations will be defined. Structural design is not
included in this scope of work and will be included in a subsequent task order, if those services prove necessary.
The roundabout will be designed following the recommendations provided in the conceptual design. Stolfus will
reference NCHRP Report 672 – Roundabouts: An Informational Guide (Second Edition) for roundabout design
and best practices. It is assumed that sidewalk will be proposed on the south side of the roundabout. Tying in
existing pedestrian and bicycle paths at the roundabout will be defined and horizontal layouts for curb ramps will
be provided, as appropriate. Design models will be prepared to develop an initial 30%-level limits of disturbance
Eva Wilson, PE, PTOE
November 3, 2021
Page 3
(toes of slope) and identify right-of-way (ROW) needs for the project. Guardrail length of need and design will be
evaluated and incorporated into the design, as appropriate. Construction phasing is not included in this scope of
services.
For the three pedestrian crossings, Stolfus will evaluate an appropriate location for the pedestrian crossing as it
relates to adjacent access points, bus stops, existing topography, and RRFB location guidance. A median refuge,
curb ramps, and sidewalk connections between the bus stops and the crossing will be designed. In order to
develop the median refuge, Stolfus will evaluate lane transitions and roadway cross-section including shoulder
widths to develop the needed width for the median. If shoulder widths must be reduced to accommodate the
median, coordination with CDOT will be conducted to confirm that shoulder widening will not be required. A
signing and striping plan with RRFB design will be developed. Vertical design to identify limits of disturbance
(toes of slope) for sidewalk construction and/or shoulder widening will be conducted. Vertical impacts of the
median will be evaluated to ensure positive drainage. Horizontal layouts of curb ramp will be included, but vertical
design will not be developed.
D. PRELIMINARY ENGINEERING (FIR) PLANS
Stolfus will prepare project documentation including development of preliminary FIR plans and an opinion of
probable cost. A CDOT Form 463 (Design Data) will be prepared and submitted to CDOT. Stolfus will provide
QA/QC review for the project. We will also provide technical support throughout the project in an advisory
capacity. Our review efforts will confirm appropriateness of methodologies used, accuracy of documents,
reasonableness of conclusions, document completeness, and overall clarity.
The Preliminary (30%) FIR Submittal will include:
- Title Sheet, Standard Plans List, General Notes, Typical Sections, Survey Control Diagram, Geometric
Control Plans, Roadway Plans, Roadway Profiles, Signing and Striping Plans.
Tabulations, cross-sections, and specifications are excluded from this scope of services.
E. TOWN OF AVON AND CDOT PLAN REVIEW
Stolfus will submit plans to the Town and CDOT for formal review at 30% completion level. Reviews are
approximately two (2) weeks. A formal FIR meeting will be held with the Town and CDOT to review the plans.
Comments will be summarized and a response matrix will be prepared for scoping the next phase.
F. DESIGN STANDARDS
Drawings and designs will be in accordance with the Section 7.32 Engineering Improvement Standards of the
Town’s Municipal Code, CDOT Roadway Design Guide, NCHRP Report 672- Roundabouts: An Informational
Guide; MUTCD, CDOT M&S Standards, CDOT Standard Specification for Road and Bridge Construction and
other standards incorporated by reference.
G. FIELD SURVEYS
As subconsultant to Stolfus, Farnsworth will complete the following:
Conduct a Pre-Survey conference with the Town and CDOT prior to beginning work.
Control Survey/Diagram
• Establish horizontal and vertical survey control for the site based on existing control points and
benchmarks. The coordinate system will be a NAD83 Colorado State Plane Central Zone modified to
ground coordinates. Vertical Datum will be NAVD88.
• Establish permanent project specific inter-visible control points. Control points will be tied to all nearby
recovered section corners and quarter section corners.
• Prepare a survey control diagram with point tabulation containing horizontal coordinates, elevations,
monument descriptions, datums used, benchmark statement and conversion factors.
Topographic Survey
Eva Wilson, PE, PTOE
November 3, 2021
Page 4
• Field survey to map all existing site conditions including but not limited to pavements, curb and gutter,
curb ramps, curb islands, medians, and above ground utilities such as overhead poles, above ground
boxes and manhole lids.
• Request utility locates and field survey to locate utility markings within the survey limits.
• As-built survey of existing sanitary and storm structures and inverts within the survey limits is not a part of
this proposal. Only manhole lids will be located with no designation to type.
• Prepare a topographic base map containing all points, break lines, planimetrics, 1’ contours and DTM.
• Conduct an existing ROW verification survey and provide existing ROW linework.
• Survey limits are defined in the attached .kmz file.
H. RIGHT OF WAY
Per Item G, existing ROW verification survey will be conducted by Farnsworth. Approximate permanent and
temporary impacts to ROW will be defined, as needed, as part of preliminary design for each site. Design efforts
will look to eliminate or minimize ROW needs. Right-of-way plans, exhibits, and legal descriptions are excluded
from the scope of services.
I. UTILITIES
Farnsworth will arrange to have existing utilities marked and will survey the resulting marks. SUE and utility
coordination is excluded from the scope of services for this task order. If necessary, these services will be
provided in a subsequent task order. Based on utility locates, potential utility conflict and requirements for SUE
will be identified for the second phase of the project for final design.
J. DRAINAGE AND WATER QUALITY
The scope of services for this task order does not include detailed drainage and water quality design. These
services will be provided in a subsequent task order. Roadway design will consider drainage patterns and look to
generally maintain drainage patterns and/or identify low points and modification to drainage patterns that need to
be addressed during final design. Stormwater management plan will not be developed with this phase of the
project. It is anticipated that drainage design, water quality design, SWMP, and a drainage report will be required
by CDOT for final design.
K. CONTRACT TIME
Stolfus will complete the scope of services within six months from receipt of notice to proceed, including FIR
review by the Town and CDOT and FIR meeting. Weather delays for survey could impact the schedule.
L. DESIGN SUPPORT DURING CONSTRUCTION
Since this scope only covers preliminary engineering, this scope of services excludes final design, CDOT
clearances, advertisement, and design services during construction.
M. PUBLIC INVOLVEMENT SUPPORT
Stolfus will prepare an exhibit for each site (up to 4), as well as up to 3 other exhibits for items like project goals,
schedule, and overview for the purposes of reviewing the project with the public. Other materials including a sign-
in sheet, comment sheet, and FAQ will also be prepared. The Town will organize and conduct a public meeting to
inform the public of the proposed improvements and gather feedback. Stolfus staff will not attend the meeting. If
desired, this can be added to our scope of services at our current hourly rates.
DELIVERABLES
Deliverables expected for this project include meeting notes; traffic counts; traffic memo; topographic survey;
design calculations; roundabout concept exhibit, Preliminary (30%) plans; quantities and opinion of probable cost;
and comment response matrix; in electronic format.
Eva Wilson, PE, PTOE
November 3, 2021
Page 5
FEE
Stolfus and its subconsultants will perform these engineering services for a total fee of $124,548. We appreciate
the opportunity to work with the Town of Avon and would be happy to answer any questions you have on this
Scope of Services.
Sincerely,
STOLFUS & ASSOCIATES, INC.
Matthew J Brown, PE, PTOE
Senior Transportation Engineer
ID Task Task Name Duration Start Finish
1 NTP 0 days Mon 11/8/2 Mon 11/8/2
2 CDOT Scoping Meeti 0 days Tue 11/16/2 Tue 11/16/2
3 Data
Collection/Traffic
25 days Mon
11/8/21
Tue
12/14/21
4 Survey (includes
permits, PTE,
CDOT PreSurvey
Conference)
25 days Mon
11/8/21
Tue
12/14/21
5 Traffic Counts 5 days Mon 11/15/Fri 11/19/21
6 Traffic Analysis 15 days Mon 11/22/Tue 12/14/2
7 Preliminary Design 56 days Wed 12/15/Mon 3/7/22
8 Preliminary
Roadway/Traffic
(3 crossings)
20 days Wed
12/15/21
Fri 1/14/22
9 Preliminary
Roadway/Traffic
(roundabout)
20 days Wed
12/15/21
Fri 1/14/22
10 FIR Plans 15 days Mon 1/17/2 Fri 2/4/22
11 FIR QC 10 days Mon 2/7/22 Fri 2/18/22
12 FIR Submittal 0 days Fri 2/18/22 Fri 2/18/22
13 FIR Review 10 days Mon 2/21/2 Fri 3/4/22
14 FIR Meeting 0 days Mon 3/7/22 Mon 3/7/22
15 FOR Scoping 13 days Mon 2/21/2 Wed 3/9/22
16 FOR NTP 0 days Wed 3/9/22 Wed 3/9/22
17 Final Design 76 days Thu 3/10/22 Fri 6/24/22
18 Environmental
Investigation
60 days Thu 3/10/22 Thu 6/2/22
19 Geotech Investigat 30 days Thu 3/10/22 Wed 4/20/2
20 Structure Selection 20 days Thu 4/7/22 Wed 5/4/22
21 Structure Design 15 days Thu 5/5/22 Wed 5/25/2
22 Final
Roadway/Traffic
35 days Thu 3/10/22 Wed
4/27/22
23 Confirm ROW Nee 0 days Wed 4/13/2 Wed 4/13/2
24 Drainage Design 45 days Thu 3/10/22 Wed 5/11/2
25 Lighting Design 30 days Thu 3/31/22 Wed 5/11/2
26 SUE QL‐B and QL‐A 30 days Thu 3/31/22 Wed 5/11/2
27 Incorporate SUE
Data into Design
10 days Thu 5/12/22 Wed
5/25/22
28 FOR Plan Producti 20 days Thu 4/28/22 Wed 5/25/2
29 Specifications 10 days Thu 5/12/22 Wed 5/25/2
30 FOR QC 10 days Thu 5/26/22 Thu 6/9/22
11/8
11/16
2/18
3/7
3/9
4/13
September October November December January February March April May June July August September October November December January F
Task
Split
Milestone
Summary
Project Summary
Inactive Task
Inactive Milestone
Inactive Summary
Manual Task
Duration-only
Manual Summary Rollup
Manual Summary
Start-only
Finish-only
External Tasks
External Milestone
Deadline
Progress
Manual Progress
Page 1
Project: stone bridge schedule
Date: Thu 10/28/21
ID Task Task Name Duration Start Finish
31 FOR Submittal 0 days Thu 6/9/22 Thu 6/9/22
32 FOR Review 10 days Fri 6/10/22 Thu 6/23/22
33 FOR Meeting 0 days Fri 6/24/22 Fri 6/24/22
34 PS&E Plans 20 days Mon 6/27/2 Mon 7/25/2
35 ROW, if needed 180 days Thu 4/14/22 Mon 12/26/
36 ROW Plans 30 days Thu 4/14/22 Wed 5/25/2
37 ROWPR 0 days Fri 6/10/22 Fri 6/10/22
38 ROW Plan Revision 10 days Fri 6/10/22 Thu 6/23/22
39 ROW Plan Approva 10 days Fri 6/24/22 Fri 7/8/22
40 ROW Acquisition 120 days Mon 7/11/2 Mon 12/26/
6/9
6/24
6/10
September October November December January February March April May June July August September October November December January F
Task
Split
Milestone
Summary
Project Summary
Inactive Task
Inactive Milestone
Inactive Summary
Manual Task
Duration-only
Manual Summary Rollup
Manual Summary
Start-only
Finish-only
External Tasks
External Milestone
Deadline
Progress
Manual Progress
Page 2
Project: stone bridge schedule
Date: Thu 10/28/21