Advisory Stakeholder Committee Meeting

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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Welcome &

Introductions

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Agency Partners

4 WELCOME & INTRODUCTIONS

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Project Overview

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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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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

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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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Preliminary Design

Concepts Update

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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

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Site Assessments

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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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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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Previous Site Use

14 SITE ASSESSMENTS

Service Track Area

Turntable

Machine Shop

Diesel Shop

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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)

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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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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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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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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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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


SOIL GAS SAMPLING:• 228 sample locations


SITE ASSESSMENTS

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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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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

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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

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Site Remediation Options

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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

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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


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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


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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


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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.


SOLIDIFICATION/STABILIZATION

PHYTOREMEDIATION

TAYLOR YARD

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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


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Discussion

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Stormwater

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Preliminary Analysis Considerations

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Stormwater Feature Examples

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River Hydrology &

Hydraulics

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Hydrology & Hydraulics Objectives

▪ Flood Risk: No impact to flood risk

▪ Habitat: Safely reduce river velocity to support habitat

36 RIVER HYDROLOGY & HYDRAULICS

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TAYLOR YARD G2

ARBOR Study – Reach 6

TAYLOR YARD

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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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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.


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Preliminary G2 Hydrologic Analysis

▪ No Edge Change – “The Yards”

▪ Creating an Island Within the Channel – “Island”

▪ Cutting Back the Channel Edge – “Soft Edge”


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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

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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


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Potential Flood Risk Abatement Strategies

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Discussion

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Ecology/Habitat

Restoration

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G2 Biodiversity Framework

Structure

source: AECOM

46 ECOLOGY/HABITAT RESTORATION

Pattern Function

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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.)


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ARBOR CHAP Baseline Score

Habitat Units (HU) = 219.3


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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)


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Expanded Longcore/ TNC 1887 Ecology Benchmark


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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


Emergent Marsh

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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)


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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


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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

»


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Potential Riparian EcologySoft Edge

Island

The Yards

Slow

Fast


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Discussion

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Community

Engagement

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● 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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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

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Discussion

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Thank you