advisory stakeholder committee meeting
TRANSCRIPT
TAYLOR YARD
RIVER PARK
TAYLOR YARD
RIVER PARK
Advisory Stakeholder Committee Meeting
March 7, 2019www.TaylorYardG2.com
TAYLOR YARD
RIVER PARK
TAYLOR YARD
RIVER PARK
AGENDAIntroductions & Overview
Site Assessments
Soil Remediation Options
Discussion
Stormwater
River Hydrology & Hydraulics
Discussion
Ecology/Habitat Restoration
Discussion
Community Engagement
Discussion
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RIVER PARK6
G1 Bowtie Parcel18 AC
Taylor YardG2 River Park42 AC
Rio de Los Angeles State Park40 AC
Taylor Yard G2 Site Location
PROJECT OVERVIEW
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RIVER PARK
Project Phasing & Development Schedule
Guided Site Tours▪ Starting May 2019▪ Monthly on a Saturday morning
Viewing Platform▪ Goal to open by the end of 2019▪ Viewing platform with interpretive and
interactive signage
7
Early Activation▪ 2-3 Year Timeline▪ Targeted remediation, public events, river activation
Interim▪ 5 Year Timeline▪ Additional remediation, cultural institution,
stormwater quality improvement feature, youth activities and training opportunities
Long-Term▪ 10 Year Timeline▪ Full remediation, habitat, recreation
PROJECT OVERVIEW
TAYLOR YARD
RIVER PARK
Milestones and Next Steps2017▪ City of Los Angeles purchased the Taylor Yard G2
parcel▪ Bureau of Engineering selected consultant team to
develop Taylor Yard G2 River Park Project
2018▪ Community engagement began▪ Began developing preliminary design concepts▪ Site assessments completed
2019▪ Early Activation Project design/development▪ Environmental Review begins▪ Viewing Platform Project design/construction▪ Implementation Plan for Taylor Yard G2 completion▪ Begin Response Plan development for DTSC approval
2020▪ Phased site remediation begins▪ Early Activation Project construction
2021▪ Taylor Yard Pedestrian Bridge opens▪ Early Activation Project opens
2024▪ Interim Use Project opens to public
2028▪ Long-Term Project completion
8 PROJECT OVERVIEW
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RIVER PARK
Preliminary Design Concepts Update
▪ City Team and Agency Partners working to refine preliminary design concepts
▪ Public Design Concepts Workshop will take place in Spring 2019
10 PRELIMINARY DESIGN CONCEPT UPDATE
Island Soft Edge The Yards
TAYLOR YARD
RIVER PARK
Department of Toxic Substances Control (DTSC)
▪ DTSC’s role is to oversee investigations and cleanup of contaminated properties
▪ Agreement with DTSC under California Land Reuse & Revitalization Act (CLRRA)
▪ DTSC conducts separate community outreach
12 SITE ASSESSMENTS
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RIVER PARK
Site Assessments Process
13 SITE ASSESSMENTS
Comments Received from DTSC*
Review Site History and
Previous Environmental
Documents
• Develop Sampling Work
Plan
• Develop Site-Specific
Health and Safety Plan
Conduct Sampling and
Analysis
Evaluate Data, Prepare
Phase II Report
• Evaluate Remedial
Alternatives/Select
Remedial Option(s)
• Dust Suppression Application
Develop Phased
Remediation Plan
Begin Phased
Remediation According
to Approved Plan
March 2018 December 2018
April 2019
June 2019
2020January 2018 September 2018
*DTSC Comments: https://www.envirostor.dtsc.ca.gov/public/deliverable_documents/1032867252/20190221-TaylorYardG2-InvestigationReport-DTSC_Letter.pdf
February 2019
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RIVER PARK
Previous Site Use
14 SITE ASSESSMENTS
Service Track Area
Turntable
Machine Shop
Diesel Shop
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RIVER PARK
Contaminants at Taylor Yard G2
SITE ASSESSMENTS15
CONTAMINANT CATEGORY
HISTORICAL SOURCES
Total Petroleum Hydrocarbons (TPH)
Diesel fuel, gasoline, engine oil, grease
Metals Batteries, truing (grinding) for train wheel and track maintenance, treated wood (rail ties)
Volatile Organic Compounds (VOCs)
Solvents, degreasers, painting products (resins, sealants, solvents, lacquers, varnish)
Semi-Volatile Organic Compounds
(SVOCs)Paint strippers, resins, adhesives, degreasers
Pesticides/Herbicides
Landscape maintenance and pest management
Polychlorinated Biphenyls (PCBs)
Coolants and lubricants in transformers,capacitors and other electrical equipment. Also found in fluorescent
light fixtures and hydraulic oils.
Asbestos Building materials (roofing, transite piping)
TAYLOR YARD
RIVER PARK
Extent of Contamination (Previous Studies)
PREVIOUS STUDIES▪ Taylor Yard Remedial Investigation Data Summary
Report Dec. 28, 2004
▪ Final Remedial Action Plan (RAP) for the Taylor Yard Parcel G2 in Los Angeles, CA Feb. 2014
▪ Data Gaps Investigation Work PlanSept. 15, 2015
FINDINGS▪ Feasibility study needed to address human health risks
▪ Identified data gaps: determined areas of potential concern that require further investigation
16 SITE ASSESSMENTS
Extent of Contamination (Previous studies)
Contaminants:▪ Metals▪ Petroleum▪ PAH’s▪ VOC’s
Data from Final Remedial Action Plan, CDM Smith, February 2014
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RIVER PARK
Health and Safety Plan▪ Health and Safety Plan: Ensures all site operations are conducted safely to
protect onsite workers and the surrounding community.
▪ Review historical levels of contaminants of concern
▪ Identify onsite activities
▪ Identify physical, chemical and environmental hazards associated with each activity
▪ Designate level of personal protective equipment and hazard control required for each activity
▪ Describe monitoring procedures
▪ Describe decontamination procedures
▪ Establish standard operating procedures for worker safety
▪ Establish communication and emergency procedures
▪ Occupational Safety Health Act created by Occupational Safety and Health Administration (OSHA) requires employers to provide their employees with working conditions that are free of known dangers.
▪ Health and Safety Plan was reviewed by DTSC on March 14, 2018.
17 SITE ASSESSMENTS
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RIVER PARK
Sampling and Analysis Methods
Ground penetrating radar: Locates underground storage
tanks, partial building
foundations, abandoned
drums, pipelines, rail lines,
trenches, etc.
Drilling: access soils and soil gas
at depth to collect samples for
laboratory analysis
Test Pits: uncovers
potential buried
objects of concern
18 SITE ASSESSMENTS
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RIVER PARK
Health and Safety Plan ImplementationBreathing Zone Monitoring
▪ Continuous monitoring for VOCs that may be present in breathing zone during sampling
▪ Air quality meter is ALWAYS present
▪ Action Level based on the highest detected concentration of contaminants reported onsite
▪ If Action Level exceeded for 5 minutes, stop work and do additional testing and exit work zone if vapor levels do not decrease
▪ During the duration of testing, 1 exceedance occurred but resolved within the 5-minute window
Dust Abatement
▪ Hollow barrel samplers and acetate sleeves used to collect samples generate minimal dust
▪ Water spray used at test pits during excavation and sampling to suppress dust and contain silica particles from broken concrete
▪ Visible dust monitoring verified dust was minor and localized
19 SITE ASSESSMENTS
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RIVER PARK20
Site Assessments SamplingJune 6, 2018 - September 21, 2018
SITE ASSESSMENTS
GROUNDWATER SAMPLING:• 16 sample locations (on and off-site)
• 22 total samples (at various depths)
SOIL SAMPLING:• 78 locations
• 645 total samples (at various depths)
SOIL GAS SAMPLING:• 228 sample locations
• 452 total samples (at various depths)
SITE ASSESSMENTS
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RIVER PARK
Surface Contamination – Lead (Metals)
DRAFT
Summary of Soil Lead Results (0-5 ft)
Compound MIN (mg/kg) MAX (mg/kg) AREA (sq ft) COLOR
Lead
80 320 1,171,500
321 1,000 574,835
1,001 10,000 321,302
10,001 25,000 23,670
21 SITE ASSESSMENTS
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RIVER PARK
Surface Contamination – Diesel (TPH)
DRAFT
SITE ASSESSMENTS
Total Petroleum Hydrocarbons as Diesel (TPH C10 to C28) 0-5 FT DEEP
INTERVAL MIN (mg/kg) MAX (mg/kg) COLOR
1 0 97
2 98 440
3 441 1,000
4 1,001 10,000
5 10,001 36,000
22
TAYLOR YARD
RIVER PARK
Surface Contamination – VOCs
DRAFT
SITE ASSESSMENTS
Summary of Soil Gas Results (0-10 ft)
COMPOUND MIN (mg/kg) MAX (mg/kg) COLOR
Tetrachloroethene (PCE)
460 2,000
2,001 10,000
10,001 150,000
Vinyl Chloride (VC)
9.5 160
161 1,000
1,001 15,000
Benzene97 500
501 1,000
23
TAYLOR YARD
RIVER PARK
Remediation Objectives
▪ Community: Open and transparent community engagement
▪ Remedy: Recognizing community concerns, remediation practices will be controlled and monitored to ensure public safety
▪ Environment: Create a safe, healthy and vibrant ecosystem for public recreation
SOIL REMEDIATION OPTIONS25
TAYLOR YARD
RIVER PARK
Use combination of remediation practices to achieve appropriate residential, recreational, or ecological standards based on the ultimate design:
▪ Soil Removal and Disposal: Impacted soil is removed and transported by truck or train to an appropriate disposal site
▪ Engineered Cap: Impacted soil is covered with clean sand, an impermeable liner, then several layers of clean soil to allow for vegetation
▪ Soil Treatments: Impacted soils are treated to either transform, capture or stabilize target contaminants in-place or following excavation (eg: phytoremediation, microbial degradation, chemical oxidation, stabilization/solidification)
… among others
Entry way to Chatsworth Park South, a remediated Los Angeles park
Possible Remediation Strategy
SOIL REMEDIATION OPTIONS26
TAYLOR YARD
RIVER PARK
Removal and Disposal▪ Impacted soil is removed and placed
in a lined, placarded truck or train
▪ Truck is inspected and cleaned prior to leaving site
▪ Soil to be transported under manifest to a disposal site in accordance with State and Federal Regulations
SOIL REMEDIATION OPTIONS27
TAYLOR YARD
RIVER PARK
Engineered Cap▪ Impacted soil is covered with clean
sand to allow placement of Geosynthetic Clay Liner (GCL) or similar
▪ GCL provides a barrier between surface material and contaminants
▪ Above the GCL, several layers of clean, imported soil allow for flexible topography, vegetation and water features
SOIL REMEDIATION OPTIONS28
TAYLOR YARD
RIVER PARK
Soil Treatments▪ Impacted material is treated in place or
following excavation, using physical, chemical or biological processes.
▪ Treatment technology is selected based on contaminants and site conditions.
▪ Example: In-Situ Phytoremediation -Contaminants are absorbed and accumulated in the plant roots, flowers, leaves, and stems. Plants are then harvested and disposed of.
▪ Example: Ex-situ Solidification/stabilization -Contaminants are immobilized through the addition of reagent and physical mixing.
SOIL REMEDIATION OPTIONS29
SOLIDIFICATION/STABILIZATION
PHYTOREMEDIATION
TAYLOR YARD
RIVER PARKREMEDIATION OPTIONS
Potential Impacts
REMEDIATION STRATEGY POTENTIAL IMPACTS
Soil Removal and Disposal
Truck and train traffic through neighborhoods, transfer of hazard to
off-site disposal destination, complete removal vs. partial removal
(may require capping, monitoring)
Engineered Cap Requires maintenance and monitoring, possible land-use restriction
Soil TreatmentsRequires maintenance and monitoring, generation of byproducts,
lengthy process, uncertain results, increase in material volume, may
require capping
SOIL REMEDIATION OPTIONS30
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RIVER PARK
Hydrology & Hydraulics Objectives
▪ Flood Risk: No impact to flood risk
▪ Habitat: Safely reduce river velocity to support habitat
36 RIVER HYDROLOGY & HYDRAULICS
TAYLOR YARD
RIVER PARKRIVER HYDROLOGY & HYDRAULICS
LA River Design Flow Rates
RIVER HYDROLOGY & HYDRAULICS38
Table 1-1 Recurrence Interval for Flows at Station F57
RECURRENCE INTERVAL (yr) FLOW RATE (cfs)
2-yr 16,317
5-yr 29,081
10-yr 37,518
50-yr 54,576
100-yr 61,031
Los Angeles County Drainage Area (LACDA) Design Flow (1991) 83,700
USACE Floodplain Management Services (FPMS) Study (2016) 93,800
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RIVER PARK
USACE Hydrologic Analysis▪Current Conditions – Using a design flowrate of 93,800 cfs (USACE), the current state of the LA River shows potential flood risk to the south/west of G2 Add more – The original channel design used 83,700 cfs for the design flow rate. Changes to the watershed account for the increased flow rates.
▪Current conditions include deposited sediment and growth of vegetation within the channel
▪USACE Analysis specifically identified need for further refinements and additional analysis during subsequent phases.
39 RIVER HYDROLOGY & HYDRAULICS
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RIVER PARK
Preliminary G2 Hydrologic Analysis
▪ No Edge Change – “The Yards”
▪ Creating an Island Within the Channel – “Island”
▪ Cutting Back the Channel Edge – “Soft Edge”
40 RIVER HYDROLOGY & HYDRAULICS
TAYLOR YARD
RIVER PARK
River Velocity & Surface Elevation
41
Soft Edge: +1.8’ The Yards: Negligible
Existing - Assumes Original Cross-Section
ARBOR: +3.6’
Island: +3.4’
RIVER HYDROLOGY & HYDRAULICS
TAYLOR YARD
RIVER PARK
Further Hydraulic Analyses
▪Develop 2-D models for the river and the proposed concept alternatives
▪Evaluate impacts to water surface elevations and velocities related to cross-sectional changes
▪Evaluate impacts to water surface elevations and velocities related to vegetation and roughness
▪Develop channel protection concepts to include bioengineering and hardscape based on findings of results
▪Develop riparian corridor habitat plans based on expected velocities and river impacts
42 RIVER HYDROLOGY & HYDRAULICS
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RIVER PARK
G2 Biodiversity Framework
Structure
source: AECOM
46 ECOLOGY/HABITAT RESTORATION
Pattern Function
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RIVER PARK
CHAP Alt 1 Proposed (also Alt 20)
2. Expose storm drain outlets, convert to natural stream confluence, & divert water quality ponds as needed, ???....in adjacent channel.
3. Create geomorphology and plant for freshwater marsh
4. Grade adjacent areas to a lower elevation for habitat and “offline?” retention.
5. Create geomorphology for open water (should this be #6 instead “…for historic wash” not “..for open water”?)
17. Habitat corridoes, riparian planting on banks (assume easiest method)
19. Planting built into channel walls (reshape concrete walls to accommodate vegetation or add handing “boxes?” (native vines, small shrubs, etc.)
47 ECOLOGY/HABITAT RESTORATION
TAYLOR YARD
RIVER PARK
ARBOR CHAP Baseline Score
Habitat Units (HU) = 219.3
48 ECOLOGY/HABITAT RESTORATION
TAYLOR YARD
RIVER PARK
ARBOR CHAP Preferred Alt (post
construction year)
Existing G2 HUs = 219.3
Proposed G2 HUs (gross) = 649.6
Net G2 HUs = 430.3 (3x existing)
4949 ECOLOGY/HABITAT RESTORATION
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RIVER PARK
Riparian Vegetation Types CATEGORY DOMINANT VEGETATION TYPES
Emergent & Ephemeral MarshHerbaceous vegetation, lays down during flood
Examples: juncus textillus, typha spp
Riparian StrandTall shrubs/small trees interspersed with bare sand/cobble Examples: arroyo willow, sandbar willow, mulefat
Riparian WoodlandDense trees and shrubs
Examples: black willow, freemont cottonwood, western sycamore, white alder, black walnut
Riparian WoodlandRiparian Strand
51 ECOLOGY/HABITAT RESTORATION
Emergent Marsh
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RIVER PARK
Objectives
1. Create habitat for target species (amphibian, riparian bird, meadow bird,
fish, upland reptile, large mammal)
2. Restore ecosystem structures and functions (riparian, upland, tributary)
3. Provided connectivity (on and off-site, upland and riparian, habitat and
hydrologic)
G2 Biodiversity Goals
3x improvement from Existing Condition (potential ARBOR equivalent)
52 ECOLOGY/HABITAT RESTORATION
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RIVER PARK
Preliminary Habitat Performance Metrics
1. Maximize habitat structural quality of landscapes as appropriate
2. Reflect historic ecosystem variety
3. Larger landscape patches are more valuable
4. Wider landscape corridors are more valuable
5. Corridors positioned for key offsite connection points
6. Minimized edge effects
53 ECOLOGY/HABITAT RESTORATION
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RIVER PARK
Urban Ecology Framework
Urban Ecological FunctionsUrban Ecosystem Properties
Landform
Soil
Topography
Slope
Climate
Aspect
Seasons / precipitation
Urban heat island / climate chg.
Hydrology
Runoff/Stormwater
Infiltration/Ground water
Flooding
Effects on people
Ecosystem services (placemaking, recreation, reduced hazard/pollution exposure, etc)
Potential impacts (negatives)
Effects on nature
Habitat
Pollution reduction
Edge effects (negatives)
Land Cover / Social
Vegetation / Landscape
Buildings / Infrastructure
Human use / perception
»
54 ECOLOGY/HABITAT RESTORATION
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RIVER PARK
Potential Riparian EcologySoft Edge
Island
The Yards
Slow
Fast
55 ECOLOGY/HABITAT RESTORATION
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RIVER PARK
● January 2018 - Community Site Tour● January 2018 - Design Workshop at Sotomayor
Learning Academies● October 2018 – Community Discussion at LA
River Center● December 2018 – Site Assessment Discussion at
LA River Center● 3 meetings of Technical Advisory Committee and
Community Leadership Advisory Committee
● Multiple focus groups, small group meetings, presentations to neighborhood groups
● Community canvassing● 1,300 responses to survey● 21 E-mail Blasts ● Dedicated Website ● English & Spanish Fact Sheets● 1,250+ E-mail Database
63 COMMUNITY ENGAGEMENT
Community Engagement - 2018
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RIVER PARK
Outreach Goals
Community Engagement
▪ One-on-one meetings
▪ Group meetings
▪ Neighborhood Councils/ Other Regular Meeting Attendance
▪ Presence at Farmers Markets, libraries, etc.
▪ Meeting the community where they live, work
▪ Inform, educate and engage
▪ Get feedback and suggestions
▪ Provide process for community to ask questions and share concerns
▪ Develop support for project and process
Continued Outreach and Engagement
59 COMMUNITY ENGAGEMENT