11 Exhibit A - ProposalRichmond, CA 501 Canal Blvd., Suite I Richmond, CA 94804 (510)215-3620
Ms. Lisa Petersen February 24, 2020
Town Engineer Proposal No: 58.16.55
Town of Los Gatos
Engineering Services
41 Miles Avenue
Los Gatos, CA 95030
RE: Proposal to Provide Professional Engineering Services for the Shannon Road Embankment Stabilization
Project
Dear Ms. Petersen,
NCE is pleased to present this proposal to the first phase of professional engineering services to complete a
geotechnical investigation and develop preliminary repair alternatives fo the Shannon Road Embankment
Stabilization Project. Following this first phase of work and upon the selection of a preferred alternative by the Town,
NCE will prepare a proposal for the second phase of work to provide civil and geotechnical engineering design
services to develop road embankment stabilization construction documents.
BACKGROUND
Based on our site meeting with Town staff on January 9, 2019, we understand that there have been long-term
pavement cracking and settlement issues for approximately 1,300 linear feet of the paved road along Shannon Road
between Santa Rosa Drive and Diduca Way. The pavement cracking and settlement appeared to be mostly contained
within the outer travel lane on the downslope side, although some limited portions of the roadway exhibited
pavement distresses extending into the inner travel lane. The section of the road was recently annexed into the
Town of Los Gatos from unincorporated Santa Clara County. We understand from the Town that the County had
been addressing settlement and pavement cracking for several decades. Routine maintenance undertaken by the
County had apparently typically consisted of sealing of asphalt pavement cracks and placement of additional asphalt
concrete along the settling portions of the roadway to relevel the driving surface.
The Town has therefore requested a scope of work from NCE and it’s subconsultant Cal Engineering and Geology
(CE&G) to complete a geotechnical investigation and develop repair alternatives with approximate costs.
SCOPE OF WORK AND FEE ESTIMATE
NCE has retained our subconsultat CE&G to complete the geotechnical investigation and develop repair alternatives
in accordance with their attached detailed proposal. NCE will review and discuss repair alternatives, support the
Town with any interim roadway maintenance measures (e.g. cracking sealing or filling cracks/depressions) that may
need to be completed and providing project coordination, updates to the Town, and invoicing.
This work can be completed on a time and materials basis for a not to exceed fee of $79,950 (which includes a 10%
mark-up of CE&G fees of $67,225 and $6,000 for NCE labor).
SCHEDULE
Once we have a notice to proceed and kick-off meeting we will provide the Town a schedule for completion of this
work, understanding that the Town will need to have an estimate of construction costs as part of the yearly Town
budgeting cycle.
EXHIBIT A
2 | Page
NCE is appreciatiave of our working relationship with the Town and for the opportunity to assist the Town with this
project. We trust that this provides the information required at this time. If you have any questions or would like to
discuss this request, please contact the undersigned at (510) 215-3620.
Sincerely,
NCE
J. Ryan Shafer, PE GE
Principal
785 Ygnacio Valley Rd. | Walnut Creek | CA 94596
6455 Almaden Expwy., Suite 100| San José | CA 95120
23785 Cabot Blvd., Suite 321 | Hayward | CA 94545
www.caleng.com
Pragmatic Expertise™
24 January 2020
Ryan Shafer, PE, GE
NCE
501 Canal Boulevard, Suite I
Richmond, California 94804
RE: Proposal to Provide Geotechnical Engineering and Design Services
Shannon Road Embankment Stabilization
Los Gatos, California
Mr. Shafer:
At your request, we have prepared this proposal to provide geotechnical investigation and
design services related to the slope instability issues impacting the road embankment
along Shannon Road in Los Gatos, California. We understand that NCE Consultants will be
the prime consultant to the Town of Los Gatos for the project and Cal Engineering &
Geology will be a subconsultant to NCE.
BACKGROUND
Based on our site meeting with Town staff on January 9, 2019, we understand that there
have been long-term pavement cracking and settlement issues related to the downslope
portion of approximately 1,300 linear feet of the paved road along Shannon Road between
Santa Rosa Drive and Diduca Way. The pavement cracking and settlement appeared to be
mostly contained within the outer travel lane on the downslope side, although some
limited portions of the roadway exhibited pavement distresses extending into the inner
travel lane. The section of the road was recently annexed into the Town of Los Gatos from
unincorporated Santa Clara County. The downslope limit of right-of-way approximates the
edge of pavement.
We understand from the Town that the County had been addressing settlement and
pavement cracking for several decades. Routine maintenance undertaken by the County
had apparently typically consisted of sealing of asphalt pavement cracks and placement of
additional asphalt concrete along the settling portions of the roadway to relevel the driving
surface. There is reportedly up to 12 feet of asphalt along the outer edge of the road in
some locations. Approximately two years ago, measures were undertaken by the County to
stabilize the problematic areas of the roadway by injecting polyurethane foam below the
outer half of the road embankment within the areas of historic settlement and cracking.
Proposal to Provide Geotechnical Engineering and Design Services Page 2
Shannon Road Embankment Stabilization ‐ Los Gatos, California 24 January 2020
Pragmatic Expertise™
After the foam injection was completed, the outer half of the road was received a 2.5- to 3-
inchpavement inlay; details of the exact foam injecting methods are not well known at this
time. The road was then annexed to the Town from the County shortly after the completion
of this repair. Despite the foam injection work, the road embankment has continued to
move downslope and significant pavement distress has re-developed. The settlement has
caused some of the injection pipes that were left following injection to protrude up through
the pavement surface.
PROPOSED SCOPE OF WORK
General Description
The Town of Los Gatos has indicated that they wish to develop a long-term, cost effective
strategy to address the embankment stability issues along this stretch of Shannon Road,
providing the repair cost is feasible from a cost perspective. In order to develop
stabilization alternative(s), it will be necessary to complete a geotechnical investigation of
the site and develop alternatives for both the short-term mitigation of the currently
manifested distress and the long-term stabilization of the affected roadway embankment.
The scope of geotechnical investigation and design work proposed herein represents a
phased approach to the project.
Phase 1:
evaluate the cause(s) of the ongoing problems
identify interim short-term measures to extend roadway usability while long-term
measures are developed
identify and evaluate potential repairs and provide recommendations for design of a
preferred long-term stabilization alternative
Phase 2:
prepare construction documents for preferred stabilization alternative selected by the
Town (not included in this scope of work).
Phase 1 work will be completed primarily by Cal Engineering & Geology as a subconsultant
to NCE Consultants. Phase 2 will be completed primarily by NCE with CE&G providing
technical details and technical specifications.
Proposal to Provide Geotechnical Engineering and Design Services Page 3
Shannon Road Embankment Stabilization ‐ Los Gatos, California 24 January 2020
Pragmatic Expertise™
Phase 1 – Geotechnical Investigation and Development of Repair Alternatives
Task 1A. Evaluate the Cause(s) of the Ongoing Problems
The initial phase of work will focus on review of the known and inferred subsurface
conditions at the site. Observations made during reconnaissance of the site suggests that
stable bedrock materials are locally exposed on the upslope side of the road. The outer half
of the road appears to have been placed as side-cast fill and the ongoing movement is likely
a result primarily of creep of embankment materials that were placed directly on steep
colluvial soil when the road was originally developed pre-1950. We did note at least two
areas along the stretch of roadway where bedrock is not exposed on the upslope side of the
road and where embankment movement may be somewhat deeper than in the bedrock cut
areas. Based on our experience with similar vintage hillside roads in the greater Bay Area,
there is a good chance that no keying or benching was used when the fill was placed and
that no subsurface drainage was placed.
To investigate the subsurface conditions we will complete the following:
Prepare a base map for the project by collecting digital photographs using an UAS
(drone)and using photogrammetry to create a geo-referenced orthophoto
topographic base.
Complete geologic mapping and mapping of related significant features using the
UAS-derived orthophoto topo base map.
Plot and evaluate foam injection records from the injection work completed two years
ago.
Layout, drill, and sample up to 15 borings along the roadway over three days at key
locations to be determined based on the mapping and evaluation of previous work.
Evaluate the efficacy, cost, and advantages of completing additional subsurface
characterization using geophysical methods.
Complete laboratory testing of samples collected from the exploratory drilling.
Develop a subsurface model of the embankment for use in developing and evaluating
potential short-term and permanent repair alternatives.
Prepare a geotechnical design report that presents the findings of the investigative
work and provides recommendations for temporary measures and geotechnical
bases for alternatives development and repair design.
Assumptions:
Roadway work requiring traffic control is permitted only between 9AM and 4PM.
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Shannon Road Embankment Stabilization ‐ Los Gatos, California 24 January 2020
Pragmatic Expertise™
Traffic control will be required due to lack of roadway shoulder and narrow lanes.
CE&G will endeavor to preserve an open lane of traffic, however safety concerns
may preclude this. The Town may wish to provide advance notice to area residents.
This project is a prevailing wage project for qualifying job classifications.
Task 1B. Identify and Evaluate Interim Measures
In consultation with NCE and the Town, we will identify interim measures intended to slow
the progress of roadway distress while long-term measures are developed and plans
prepared.
Task 1C. Identify and Evaluate Potential Repairs
Based on the findings of Task 1A, we will proceed with identifying and evaluating three
potential alternatives for permanent repair of the problem areas along the road. The
alternatives will be conceptually developed to facilitate cost estimating and assessing the
impacts of construction. Alternatives will be developed for the base condition of side-cast
fill over shallow stable bedrock and the secondary condition of deeper soils underlying the
entire width of the road. The alternatives will focus on constructability of the repairs,
containment within the right-of-way, duration of work, costs, performance, and
maintenance requirements. It is anticipated that the alternatives will include primarily
retaining wall options with reconstruction of the retained portion of the road embankment
and the pavement structural section for the full width of road in the affected areas.
The results of the alternatives evaluation will be presented in an Alternatives
Memorandum. The memorandum will be prepared first in a draft format for discussion
with the NCE team and Town staff. Based on discussions regarding the draft report, a
preferred alternative will be selected. The Final Alternatives Memorandum will reflect the
discussions with the Town and present the preferred alternative.
Phase 2 – Development of Plans, Specifications, and Estimates
As part of a separated scope and fee, following selection of the preferred alternative CE&G
will work with NCE to develop plans, specifications, and engineer’s estimates (PS&E) for
bidding and construction of the selected repairs. It is anticipated that the PS&E will be
prepared at 65%, 90%, 100%, and Final for Bidding and Construction levels. CE&G will
complete necessary geotechnical and structural design calculations, develop and prepare
sections, profiles, and details for the repair measures. CE&G will also prepare technical
specifications for the geotechnical-related work. NCE will prepare all other aspects of the
PS&E and will incorporate CE&G’s work into the overall PS&E.
Proposal to Provide Geotechnical Engineering and Design Services Page 5
Shannon Road Embankment Stabilization ‐ Los Gatos, California 24 January 2020
Pragmatic Expertise™
The exact scope of work and projected level of effort and cost to complete the work will be
developed jointly with NCE after completion of Phase 1.
PROPOSED SCHEDULE
We will begin Phase 1 upon written authorization from NCE. Tasks 1A and 1B will be
undertaken concurrently to the extent possible. We anticipate that Task 1A can be
completed within about eight weeks dependent on weather conditions and availability of a
drilling subcontractor. Accounting for weather and driller availability, we suggest that 10
weeks be assumed for the completion of Task 1A plus an additional three weeks to
complete the Task 1B Draft Alternatives Memorandum.
EXECUTION
We will complete the proposed scope of work as a Task Order under the Master Services
Agreement between CE&G and NCE. The work will be completed on a time and expenses
basis for a fee not-to-exceed $67,225 unless authorized by NCE’s project manager. Our work
will be completed in accordance with generally accepted geologic and geotechnical
engineering practices and procedures. This standard is in lieu of all warranties either
expressed or implied.
If the above scope of services and terms and conditions are acceptable to you, please sign the
attached service agreement and return one copy of the entire proposal to our office together
with the requested retainer. We look forward to working with you.
Sincerely,
CAL ENGINEERING & GEOLOGY, INC.
Phil Gregory, P.E, G.E.
Senior Principal Engineer
Attachments: Level of Effort and Cost Projection
Fee Estimate ForRancho Canada Sewer Main RealignmentPrincipalAssociateProjectSenior GIS/CADD SpecialistProject AssistantSubtotalHoursSubtotalCostPermitsDrilling Sub./ EquipmentTraffic ControlUtility LocatorLaboratory TestingMileageUAS Equipment FeeSurveyorSubtotalCostTotalCostDESCRIPTION $240 $215 $160 $125 $90Phase 1 – Geotechnical Investigation and Development of Repair AlternativesTask 1A : Evaluate the Cause(s) of the Ongoing Problems: Meetings and PM 4 4 8 $ 1,220 $ 20 $ 20 $ 1,240 Site Reconnnaissance and Develop Base Map2 12 8 22 $ 3,350 $ 20 $ 200 $ 5,000 $ 5,220 $ 8,570 Geologic Mapping8 4 12 $ 1,780 $ 20 $ 20 $ 1,800 Evaluate Past Performance4 4 8 $ 1,360 $ - $ 1,360 Subsurface Exploration (3 days, USA, & traffic control plan)2 32 4 38 $ 5,910 $ 13,600 $ 5,400 $ 60 $ 19,060 $ 24,970 Laboratory Testing2 4 6 $ 1,070 $ 1,800 $ 1,800 $ 2,870 Subsurface Model Development4 4 4 12 $ 2,000 $ - $ 2,000 Geotechnical Design Report4 8 16 12 40 $ 6,740 $ - $ 6,740 Subtotal Hours4 2676328146 ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ Subtotal Cost $ 960 $ 5,590 $ 12,160 $ 4,000 $ 720 ‐ $ 23,430 $ ‐ $ 13,600 $ 5,400 $ ‐ $ 1,800 $ 120 $ 200 $ 5,000 $ 26,120 $ 49,550 Task 1B: Identify and Evaluate Interim MeasuresSite Ground Truth2 2 4 $ 910 $ - $ 910 Meeting Regarding Short‐term Alternatives2 2 4 $ 910 $ 20 $ 20 $ 930 Prepare Memorandum2 4 4 10 $ 1,840 $ - $ 1,840 Subtotal Hours68 4 18 ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ Subtotal Cost $ 1,440 $ 1,720 $ ‐ $ 500 $ ‐ ‐ $ 3,660 $ ‐ $ ‐ $ ‐ $ ‐ $ ‐ $ 20 $ ‐ $ ‐ $ 20 $ 3,680 Task 1C: Identify and Evaluate Potential Repairs (15% Design)Develop Alternatives4 4 4 12 $ 2,460 $ - $ 2,460 Prepare Conceptual Plans and Sections8 8 12 28 $ 4,500 $ - $ 4,500 Prepare Conceptual Cost Estimates4 4 8 $ 1,500 $ - $ 1,500 Draft Alternatives Memorandum2644 16 $ 2,910 $ - $ 2,910 Meeting with Town3 3 6 $ 1,365 $ 20 $ 20 $ 1,385 Final Alternatives Memorandum1222 7 $ 1,240 $ - $ 1,240 Subtotal Hours10 27 22 18 77 ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ Subtotal Cost $ 2,400 $ 5,805 $ 3,520 $ 2,250 $ ‐ ‐ $ 13,975 $ ‐ $ ‐ $ ‐ $ ‐ $ ‐ $ 20 $ ‐ $ ‐ $ 20 $ 13,995 Phase 1 Total Hours20 61 98 54 8 241 ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ Phase 1 Total Cost $ 4,800 $ 13,115 $ 15,680 $ 6,750 $ 720 ‐ $ 41,065 $ ‐ $ 13,600 $ 5,400 $ ‐ $ 1,800 $ 160 $ 200 $ 5,000 $ 26,160 $ 67,225 2020 CE&G RatesSTAFFINGREIMBURSABLES (INCLUDES 10% MARKUP)1/20/2020