HomeMy WebLinkAbout2021-09-28 - AGENDA REPORTS - PROJ R3008 BMP INFILTRATION FACILITY (2)Agenda Item: 3
CITY OF SANTA CLARITA
AGENDA REPORT
CONSENT CALENDAR
r
CITY MANAGER APPROVAL:
DATE: September 28, 2021
SUBJECT: REGIONAL BMP INFILTRATION FACILITY AND PILOT
RESIDENTIAL LID, PROJECT R3008 - APPROVE DESIGN
CONTRACT AMENDMENT
DEPARTMENT: Public Works
PRESENTER: Damon Letz
RECOMMENDED ACTION
City Council:
1. Extend the current contract and authorize an increased expenditure authority for design
services for the Enhanced Watershed Management Program Regional Storm Water Best
Management Practices Preliminary Design Investigation, Design, and Green Street Low
Impact Development Decision Tool with Pacific Advanced Civil Engineering, Inc., in the
amount of $263,875 and authorize a contingency in the amount $26,000, for a total amount
not to exceed $289,875.
2. Appropriate one-time funds in the amount of $300,000 from the Measure W Safe Clean
Water Fund (Fund 271) to expenditure account R3008271-516101.
3. Authorize the City Manager or designee to execute all documents, subject to City Attorney
approval.
BACKGROUND
The Upper Santa Clara River Enhanced Watershed Management Program (EWMP) was
developed, in coordination with Los Angeles County (County) and the County Flood Control
District, to comply with the state and federal requirements of the Storm Water Permit (Permit)
issued by the Los Angeles Regional Water Quality Control Board. The City Council entered into
an agreement with the County to develop the EWMP on July 9, 2013. The EWMP identifies
certain projects, actions, and milestones necessary to achieve compliance with pollutant
reduction standards required by the Permit. One requirement of the EWMP obligates the City of
Santa Clarita (City) to have infiltration capacity for stormwater through regional infiltration
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facilities. The EWMP activities are identified under the Community Beautification and
Sustainability theme of the City's five-year strategic plan, Santa Clarita 2025.
At its April 10, 2018, meeting, the City Council awarded a design contract to Pacific Advanced
Civil Engineering, Inc. (PACE), in an amount not to exceed $851,987 for the Enhanced
Watershed Management Program Regional Storm Water Best Management Practices
Preliminary Design Investigation, Design, and Green Street Low Impact Development Decision
Tool project. Four locations (Newhall Park, Santa Clarita Park, Valencia Glen Park, and the
future Via Princessa Park) were evaluated and three locations (Newhall Park, Santa Clarita Park,
and the future Via Princessa Park) were found to meet the minimum parameters to maximize
infiltration volumes. Of these three, Newhall Park received additional testing and was found to
have soil characteristics which support a regional stormwater infiltration facility. This location
was selected for the full design, which is anticipated to be complete by the end of the year.
Following the completion of the design phase, the project will be placed on hold for further
consideration of the construction timeline.
Of the three viable locations that PACE identified in their evaluation, the Via Princessa Park site
also demonstrated excellent soil infiltration characteristics. In addition to Newhall Park, the City
intends to submit the Via Princessa Park project for Los Angeles County Flood Control District
Measure W Safe Clean Water Program (Measure W) regional funds for the regional infiltration
system and multi -benefit amenities or nature -based solutions.
The recommended action to extend the current contract with PACE will complete the feasibility
assessment for the Via Princessa Park regional infiltration system. Assessment activities include
on -site geotechnical investigation borings and infiltration testing, site survey, identification of
nature -based solutions opportunities and amenities, and the creation of a system schematic to
identify its size and component locations. All site activities will be subject to Southern California
Regional Rail Authority and Metrolink right of entry requirements. This additional work will aid
in the assembly of the Measure W Feasibility Study, which will be used to support the Measure
W application for the project.
The remaining requested funds will provide for project administrative costs and staff time.
ALTERNATIVE ACTION
Other action as determined by the City Council.
FISCAL IMPACT
Upon approval of the recommended actions, adequate funds will be available in expenditure
account R3008271-516101 (Measure W Safe Clean Water Fund) to support the recommended
contract and all anticipated project costs.
ATTACHMENTS
Location Map
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Proposal from Pacific Advanced Civil Engineering, Inc. (available in the City Clerk's Reading
File)
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PACE
Advanced Water Engineering
AUTHORIZATION FOR CHANGE ORDER
TO: City of Santa Clarita
23920 Valencia Blvd. #120
Santa Clarita, CA 91355
ATTN:
DATE:
PROJECT:
dduncanasanta-clarita.com C.O. AUTHORIZATION #
Dan Duncan
August 30, 2021
Santa Clarita BMP #B351
1.
The following was not included in the original contract. We are requesting authorization for additional
budget.
Description of Services:
Task 1.0 — Feasibility Study
The Feasibility Study shall provide enough information about a proposed Project to allow the LA County
Safe Clean Water Steering Committee members to make an informed decision regarding funding.
Consultant shall prepare a Feasibility Study meeting the minimum required as identified in Feasibility
Study Guidelines. These minimum requirements include:
1.1) Preliminary
a. Development of a detailed description of the proposed Site X Infiltration BMP, including:
A summary of the Project's primary objective(s), secondary objective(s), and
any additional objective(s) and a description of the primary mechanisms by
which the Project will achieve its objectives. Include land ownership and related
rights -of -ways.
Develop schematic of the Project layout, including its anticipated footprint and
key components to include:
a) Diversion Structures
b) Hydrodynamic Separator
c) Underground Infiltration BMP
d) Onsite LIDS
e) Monitoring Requirements
iii. An outline of the capture area for the Project on a map and a breakdown of
acreage, land uses, municipalities, and percent imperviousness within the
capture area.
b. A description and estimate of the benefits provided (determined through best engineering
estimates and modeling, if applicable) and how the project can leverage funds and
engage the public. These benefits include Water Quality Benefits, Water Supply Benefits,
and Community Investment Benefits, and Nature -Based Solutions employed by the
Project, and how a Project may be leveraging funds and engaging the public.
c. Project Schedule overview of the estimated schedule for pre -planning, environmental
clearance, design and permits, construction bid & award, construction, operations and
maintenance of the Project.
d. A review of the effectiveness of similar types of Projects already constructed, when
available.
17520
Newhope
Street, Suite
200 1 Fountain Valley,
CA 92708 alliq
P: (714)
481-7300
F: (714)
481-7299 1 www.pacewater.com
Mr. Dan Duncan
City of Santa Clarita BMP Infiltration - C06- B351
August 30, 2021
Page 2 of 6
e. A monitoring plan to measure the effectiveness of the proposed Project once completed,
including metrics specific to the identified benefits.
f. A life -cycle cost estimate and schedule by phase (i.e., planning, design, permitting,
construction). It will also include an annual cost breakdown, including Annual operation,
maintenance, and monitoring cost and life span of the Project.
g. Operations and Maintenance (O&M) Plan: Consultant shall develop a simplified O&M
Plan, that has sufficient details to meet the requirements of the Feasibility Study.
h. An engineering analysis of the proposed Project and shall include:
Geotechnical Investigation — See Scope in Task 2.0
Site Survey — See Scope in Task 3.0
iii. Hydrology Analysis — Consultant shall prepare and update watershed
delineation of offsite tributary drainage area associated with the BMP facility
storm drain system. This will include the mapping to identify urban surface
drainage patterns, subarea delineation and concentration point identification,
and watershed hydrologic parameter characterization. The hydrology analyses
will be performed for the 85th percentile annual storm.
CEQA Preliminary Assessment — Consultant shall provide an assessment of permitting
requirements, including potential California Environmental Quality Act (CEQA)
documentation for the proposed project. It is anticipated that this project will qualify for a
Mitigated Negative Declaration. This section will also provide an inventory of permits
required, the application requirements and cost, and approval timeframe.
A plan for outreach/engagement to solicit, address, and incorporate stakeholder input on
the Project, which will also address issues related to displacement and gentrification.
k. An acknowledgment that the Project will be fully subject to and comply with any County-
wide displacement policies as well as with any specific anti -displacement requirements
associated with other funding sources.
A plan to incorporate vector minimization into the Project design, operations, and
maintenance. Consultant will use the California Department of Public Health's Checklist
for Minimizing Vector Production in Stormwater Management Structures as a basic
guideline in developing the vector minimization plan. Projects creating vector -related
public nuisances may be subject to abatement proceedings as specified in California
Health and Safety Code sections 2060 et seq. The vector minimization plans will be
reviewed by the local vector control district or agency.
m. A description of how Nature -Based Solutions are utilized to the maximum extent feasible.
If Nature -Based Solutions are not used, include a description of what options for Nature -
Based Solutions were considered and why they were not feasible.
n. A summary of any legal requirements or obligations that may arise as a result of
constructing the Project, and how those requirements will be satisfied.
o. Conceptual approval from LA County Flood Control District (LACFCD) for installation of
diversion structure and improvements to the existing storm drain infrastructure, facilities,
and/or right-of-way. Consultant shall provide the following to LACFCD to obtain a
conceptual approval letter acknowledging consistency with District's project/plan:
PACE
Mr. Dan Duncan
City of Santa Clarita BMP Infiltration - C06- B351
i. Brief project scope and benefits
ii. Vicinity map and site layout.
iii. Preliminary Cost Estimate
August 30, 2021
Page 3 of 6
p. Acknowledgment of eligible expenditures being only those incurred on or after November
6,2018.
q. A summary of the other sources of funding that are being leveraged for Project costs (if
applicable). If no other sources of funding are being utilized, a summary of what other
sources of funding were explored and/or why funding could not be secured through these
other sources.
r. A summary of how the Project will benefit Disadvantage Community (DAC) and a
discussion of measures on displacement avoidance.
s. A compact, illustrative executive summary that outlines the primary components of the
Project. The summary will be limited to 4 pages and will include the key design elements
of the Project (e.g., capacity, drainage area, location), SCW Program benefits, outreach
conducted to date, and a detailed summary of the estimated Project scoring.
t. Prepare an application summary outlining the appropriate values and descriptions to be
used by the applicant to input into the Module.
u. Deliverables: PDF of the Draft Feasibility Study and Application Summary
1.2) Final Feasibility Study
Consultant shall incorporate Review Comments into Final Feasibility Study Incorporate review
comments from the Draft Feasibility Study to the Final Feasibility Study. One set of consolidated
review comments will be provided to the Consultant before starting work on the Final Feasibility
Study.
Deliverables: PDF of the Draft and Final Feasibility Study Module
Task 2.0— Geotechnical Investigation
2_1 Geotechnical Investigation — Consultant shall perform the following geotechnical scope necessary
to identify geotechnical requirements for the construction of the underground infiltration BMP and
components:
a. Review of readily available background materials, including published geologic and
seismic hazards maps, stereoscopic aerial photographs, and reports and/or plans.
b. A field reconnaissance to observe and document the site conditions, mark -out proposed
boring locations for underground utility clearance by Underground Service Alert (USA),
and to meet with park personnel regarding site access and constraints.
c. Subsurface exploration consisting of the drilling, sampling, and logging of two hollow -
stem auger borings that will be developed for an infiltration test. The depth of the tests
will vary from approximately 15 -20 feet below the existing ground surface and will be
constrained to the existing open site as shown on Exhibit A. The infiltration test will be
supplement by 12 CPT investigation previously performed by R. T. Frankian &
Associates (RTF&A) on November 5, 2019.
d. One hollow stem auger boring near the location of the proposed diversion structure,
down to a depth of 15 — 20 ft.
PACE
Mr. Dan Duncan
City of Santa Clarita BMP Infiltration - C06- B351
August 30, 2021
Page 4 of 6
e. Data compilation and geotechnical analysis of data collected from our background
review, subsurface exploration, percolation testing, and laboratory testing. Our
geotechnical analysis and recommendations will include the following:
i. Suitability of the proposed construction from a geotechnical perspective.
ii. Anticipated soil and geologic conditions and potential geologic hazards at the
site, including liquefaction.
iii. Evaluation of the site seismicity, including anticipated ground accelerations and
2019 California Building Code (CBC) seismic design coefficients.
iv. Evaluation of the depth to groundwater and potential impacts to the project
based on our exploratory borings and readily available groundwater data.
V. 6 hrs of meeting/ project discussion with project hydrogeologist to provide
geotechnical support in evaluating potential impacts on improvements of
concern identified by hydrogeologist that could be impacted by large scale
infiltration.
vi. Evaluation of infiltration rates and suitability of the on -site soils for infiltration.
vii. Site excavation characteristics including potential for difficult excavations, such
as caving and the presence of over -size material (i.e., cobbles and boulders).
viii. General earthwork and grading considerations, including compaction
requirements and suitability of on -site material for use as fill.
ix. Evaluation of settlement potential for structures and appropriate site
preparation, including remedial excavation and re -compaction.
X. Analysis of the temporary stability of excavations and shoring pressures,
including allowable lateral earth pressures and allowable passive pressures.
xi. Evaluation of proposed diversion structure and pre-treatment system, including
lateral earth pressures, foundation support and structure backfill material.
xii. Evaluation of suitable foundation types including shallow footing foundations
with allowable bearing capacities, friction coefficients, and allowable passive
pressures.
xiii. Asphalt concrete pavement design use for moderate passenger and light truck
traffic.
xiv. Evaluation of the corrosion potential of the site soils and the appropriate type of
concrete to be used during construction.
xv. Preparation of a preliminary geotechnical evaluation report presenting our
findings, conclusions, and recommendations pertaining to the proposed
improvements.
Assumptions and Exclusions:
i. Site is accessible with a truck mounted drill rig.
ii. Soil cuttings will be spread onsite.
2_2 SCRRA — This task is to cover the requirements from the Southern California Railroad
Association for safety training, safety certification, fencing, etc. in order to work near the railroad
tracks.
a. Consultant shall apply for the Right -of -Entry Permit and will complete:
a. SCRRA Encroachment Application
b. Site Specific Work Plan
c. Plans for the proposed geotechnical site work
b. Consultant shall coordinate with SCRRA to set up SCRRA Safety Training
c. Consultant shall coordinate with fencing contractor to install temporary fencing (Type
ESA) as part of the ROE permit.
d. Consultant shall work with SCRRA to provide flagging for railroad crossing or during any
onsite work near the railroad line.
PACE
Mr. Dan Duncan August 30, 2021
City of Santa Clarita BMP Infiltration - CO6- B351 Page 5 of 6
Task 3.0 - Survey
3_1 Site Survey - Addition aerial topographic survey shall be provided for the area shown in the
attachment. Topographic survey inside the project site performed as part of the preliminary
evaluation shall be incorporated into the new survey base file. Addition field survey shall be
performed to identify inverts of existing sewer lines along the eastern portion of the site. Existing
utilities along the eastern portion of the Site X shall be provided by the City. The survey effort
shall include:
a. Establish project control based upon local centerline and boundary monuments and
provided design files.
b. Set ground control targets to be used in aerial data post processing.
c. Provide field survey to capture exiting sewer invert elevations with area of work.
d. Provide field survey to capture invert elevations of existing storm drain structures within
area of work.
e. Submit Ground control map of targets to be laid down.
f. Perform drone flight over specified area.
g. Process data into a DSM surface and planimetric data to be used for design.
h. Deliverables provided will be a point cloud (.las) format, (tif) imagery, and (.dwg) TIN file
Task 4.0 - Park Project Plan Coordination
4.1. Consultant shall coordinate with City's Park Consultant to provide input for the incorporation of
the BMP and associated components into the park concept plan. This may include the BMP
conceptual design, the diversion structure, wetland or ponding concept, and/or other stormwater
BMP/LID concepts. This task includes attending meetings, work sessions, correspondences, etc.
with the City and Park Consultant on an as needed basis for the completion of the Feasibility
Study.
4.2 Consultant shall provide preliminary evaluation of the conceptual wetland design. This task will
include identifying key wetland elements necessary for the proper wetland design, including inlet/
outlet design, macrophyte and pool zones, and hydraulic design requirements during high and
low flows.
4.3. Consultant shall provide Flood Control Design coordination with the City Park Consultant. This
includes providing BMP design concept, design data, constraint conditions, etc. that may impact
the flood control/ erosion control embankment alignment and design, which is part of the Park
Design Project.
Task 5.0 - Hydrogeological Evaluation
Further hydrogeological evaluation shall be performed on Site X as recommended in the Desktop
Analysis Site Evaluation - Stormwater Infiltration BMP Facilities - Santa Clarita, CA dated January 15,
2019 (GeoSyntec Consultants). Further hydrogeologic evaluation shall include the following:
a. Groundwater Mounding - The Desktop evaluation identified potential for high
groundwater to come with 10 feet of the bottom of the infiltration basin
periodically following a prolong and heavy precipitation. Consultant shall
evaluate the likelihood of the occurrence and impacts to the BMP or adjacent
structures.
b. Impacts to Water Supply Wells - Consultant shall provide further investigation
to confirm any adverse impacts to groundwater production wells located roughly
2000 ft northeast of Site X.
PACE
Mr. Dan Duncan August 30, 2021
City of Santa Clarita BMP Infiltration - C06- B351 Page 6 of 6
Task 6.0 — Project Management, Coordination, and Meetings
This task includes management functions for all activities of this Project. Project management will be
developed according to the following tasks:
6.1 Kick-off Meeting - One kick-off meeting between the City and Consultant
6.2 Monthly Progress and Periodic Coordination Meetings - Provide project management services to
ensure the project is delivered on scope, on schedule, and within budget. This includes as -
needed progress monthly meetings and coordination meetings. The Project is projected to be
approximately 6 months.
6.3 Review Coordination - Facilitate review of the Draft Feasibility Study. Meetings between the City
and Consultant may be held to discuss the review comments.
6.4 Project Management — Provide Internal project management of staff, billing and invoicing, and
other management tasks in order to complete all tasks required by the Scope of Work.
Deliverables: Schedule, Cost proposal, meeting agendas, meeting minutes, monthly reports, invoices,
presentations, summarized review comments and responses.
SECTION B -COMPENSATION:
PACE will complete the work outlined herein and invoice Client 100% per task/sub-task upon completion.
The total proposal fee shall be based on the following scopes in accordance with the attached billing
rates. Please reference the attached Fee Estimate Worksheet for a specific fee breakdown.
Total Fee Proposal
Estimated By: 8/27/2021
Duong Do, PE - PACE Date
AGREED TO AND ACCEPTED BY:
By
City of Santa Clarita
Date
$263,875
PACE
PAC E
ai..ENGINEERING FEE ESTIMATE
PROJECT WORKSHEET
Project Data
Project Name: Sanb daub BMP Infiltra0on-CO 6 (Sib X Feasibility SWtlyJ
Client CityoSanb danb
PACE Job Number: B351
Ez[im ate Da[e: Au uz[30 2021
TOTAL FEE PROPOSAL $263,875
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