G2 TAYLOR YARD Pre-Design Update RIVER PARK TAYLOR YARD G2 RIVER - - PowerPoint PPT Presentation

TAYLOR YARD G2 RIVER PARK TECHNICAL ADVISORY STAKEHOLDER COMMITTEE COMMUNITY LEADERSHIP COMMITTEE September 6, 2018

http://lariver.org/G2 http://www.tayloryardg2.com/

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Pre-Design Update

AGENDA

Welcome and Introductions Project Update Community Workshop and Survey Results Update on Site Assessment Water Quality Improvement Opportunities Preliminary Design Concepts Next Steps

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TAYLOR YARD RIVER PARK 2 Pre-Design Update

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Project Management Team

Michael Affeldt Director, LARiverWorks Arturo Chavez Senior Advisor Gary Lee Moore, PE, ENV SP City Engineer Deborah Weintraub, AIA, LEEDAP Chief Deputy City Engineer Christopher Johnson, PE, GE Program Manager Katie Doherty, PE Project Manager

3 Pre-Design Update

Project Partners

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California Departm ent of Toxic Substances Control

4 Pre-Design Update

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PRIME CONSULTANT Project Managem ent/ Leadership

Architecture Urban Design & Landscape Architecture Mediterranean Landscape Architecture Econom ic Developm ent & Financing Hydrology & Hydraulics/ Inspections Public Engagem ent Water Quality Civil Engineering Botany, Biology & Natural Habitat Public Engagem ent Public Engagem ent Environm ental Docum entation Soil Sam pling Managem ent

City of Los Angeles Bureau of Engineering TAYLOR YARD RIVER PARK

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TAYLOR YARD G2 LOCATION

MILE 25 OF THE LARIVER

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Project Development and Activities in 2018

EXISTING ARBOR Study Concept

Jan Public Meetings Feb Community Survey Mar Internal Pre-Design Workshops April Geophysical Survey, Groundwater Monitoring May Begin Site Assessments June Mayor’s Briefing July Site Assessment Ongoing August Site Assessment Ongoing

AGENDA

Welcome and Introductions Project Update Community Workshop and Survey Results Update on Site Assessment Water Quality Improvement Opportunities Preliminary Design Concepts Next Steps

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Community Site Tour and Workshop January 2018

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Community Workshop Table Comments

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Community Survey Results

EXISTING

ARBOR Study Concept

Over 1300 Respondents! Key Findings:

• Nature - Respondents have a high

interest in natural components; open space; trails and habitat.

• Recreation - Outdoor recreation

including walking / jogging and cycling ranked high, both as activities

• LA River - 84% reported having visited

the River. Strong interest in River interaction and education.

• Consistent Results - Community

priorities among the public are largely consistent with those of the community immediately surrounding the G2 parcel.

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Community Survey Results

EXISTING

ARBOR Study Concept

Favorite Park Features Respondents were asked to select their top three: 64% - access to nature 53% - walking and hiking trails 35% - scenic views

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Natural Space/Wildlife Habitat

Features preferred: 40%- River Access 40% - Trails 33% - Enjoying Nature/Habitat 13

Activities/Recreational Elements

ARBOR Study Concept

Park features preferred: 60%- Walking/Running/ Jogging 40% - Children’s Nature/Adventure Play 38% - Meadow and Picnicking 14

AGENDA

Welcome and Introductions Project Update Community Workshop and Survey Results Update on Site Assessment Water Quality Improvement Opportunities Preliminary Design Concepts Next Steps

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Rail Operations - Equipment Maintenance and Fueling:

• Early 1900’s – 2006
• Former facilities:
• Diesel and machine shop
• Roundhouse, turntables
• Underground and aboveground

storage tanks

• Industrial wastewater treatment

plant

• Materials previously onsite:
• Diesel and gasoline fuel
• Various oils, greases, acids, paints

and thinners

• Pesticides and herbicides
• Lead
• Cleaning and chlorinated solvents

Taylor Yard – Site Use and Environmental History

Aerial Photo of Historical Rail Operations (c 1994)

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Diesel Shop Service Tracks Machine Shop

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2018 Site Investigation (Began Summer 2018) “What are we investigating?”

2018 Site Investigation (Began Summer 2018) “What are we investigating?”

GROUNDWATER SAMPLING:

• 22 samples from 16 monitoring wells

SOIL GAS SAMPLING:

• 228 sample locations
• 452 total samples

SOIL SAMPLING:

• 78 locations
• 645 total samples

EXCAVATION TEST PITS:

• 23 pit and trench excavations

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Direct Push Equipment for Soil Sampling Mobile Laboratory for Soil Gas Analysis

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Site Assessment: “What Are We Looking For?”

• Petroleum hydrocarbons

(TPH)

• Metals
• Volatile Organic Compounds

(VOCs)

• Semi-volatile organic

compounds (SVOCs)

• Pesticides/herbicides
• Polychlorinated Biphenyls

(PCBs)

Split Spoon Sampler Showing TPH Contamination Field Notebooks Split Spoon Sampler Showing Soil Stratification

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Solution may include a combination of alternatives to achieve appropriate residential/ecological standards:

• Risk assessment for groundwater, soil and soil

gas

• Groundwater: extraction/in-situ treatment in

targeted areas

• Soil: excavation; engineered cap/paving

(temporary or permanent)

• Soil gas: extraction/venting; vapor mitigation

system

• Phytoremediation

Site Design Implications: “What Is The Remedy?”

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AGENDA

Welcome and Introductions Project Update Community Workshop and Survey Results Update on Site Assessment Water Quality Improvement Opportunities Preliminary Design Concepts Next Steps

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Water Quality Improvement Opportunities

• Regulatory Framework
• Tributary Watersheds
• Treatment Alternatives
• Infiltration
• Conclusion

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Regulatory Framework

• National Pollutant

Discharge Elimination System Permit

• Beneficial Uses
• Impaired Water Bodies
• Pollutants of Concern
• Total Maximum Daily

Load

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Taylor Yard

Watersheds Draining Near Taylor Yard G2 Parcel Total approximate tributary watershed of 4,263 acres

EXISTING

ARBOR Study Concept

• Project 480
• Eagle Rock Drain
• City UPRC Drain

29901

• City Drain 1805

Storm Drains Relevant to Taylor Yard Parcel G2

EXISTING

ARBOR Study Concept

Land Use in Drainage Subareas Tributary to G2

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Land Use Area in Acres Percent Impervious

Single Family Residential 2,266 41% Vacant 1,006 2% Multi-Family Residential 355 69% Commercial 242 94% Education 149 61% Industrial 123 73% Transportation 122 91% Total 4,263

Stormwater Quality Treatment Strategy

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TAYLOR YARD RIVER PARK 27 Hydrodynamic Trash Removal Unit Sedimentation Pond Treatment Stream* Trash

√ √

Ammonia

√

Copper

√ √

Toxicity

√ √

Indicator Bacteria

√

Nutrients (Algae)

√

*Treatment Stream: Swales, Dry Creek, Bioretention, Wetlands

Treatment Area Exhibit

Onsite Flow Only

EXISTING

ARBOR Study Concept

Onsite + Eagle Rock

• Onsite stormwater

runoff drains by gravity to “dry” creek.

• Dry creek is lined

to prevent infiltration into underlying soils.

• Treated runoff

discharged to River via outfall structure

• No pumping.

EXISTING

ARBOR Study Concept

Onsite + Eagle Rock

Onsite + UPRC (Wet Weather) + Eagle Rock (Dry Weather)

Treatment Area Exhibit (Recommended)

• Drain on-site surface

stormwater runoff by gravity to “dry” creek and detention pond.

• Drain flows (4 cfs)

pumped by solar pumps into dry creek

• Creek and pond lined

to prevent infiltration.

• Treated runoff

discharged to River via

• utfall structure.

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EXISTING

ARBOR Study Concept

Onsite + Eagle Rock

Onsite + UPRC Wet Weather (85th Percentile) + Eagle Rock Wet Weather (85th Percentile)

Stormwater management system utilizes ~41

• f the 42 acre site.

Treatment Area Exhibit for Wet Weather Flows

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Stormwater Infiltration – Not Recommended

EXISTING

ARBOR Study Concept

San Fernando Valley Super Fund Site

• Volatile Organic Compounds
• trichloroethylene (TCE)
• perchloroethylene (PCE)
• carbon tetrachloride
• 1,2-dichloroethane
• cis-1,2-dichloroethene
• 1-dichloroethane
• Metals
• Chromium
• Pesticides
• Atrazine

Taylor Yard

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Pollock Treatment Plant

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Water Management - Conclusions

• G2 site provides significant space for multiple benefits

including: river access, stormwater management, habitat restoration, active and passive recreation, public health,

• All onsite stormwater is managed.
• Infiltration of stormwater is not recommended due to historical

groundwater contamination.

• Significant offsite dry weather runoff is also managed.
• Managing significant amounts of offsite wet weather

stormwater is expensive and reduces use of G2 site for other uses.

• Contaminated soils will be remediated.
• Groundwater quality is improving.

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AGENDA

Welcome and Introductions Project Update Community Workshop and Survey Results Update on Site Assessment Water Quality Improvement Opportunities Preliminary Design Concepts Next Steps

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Concept Pre-design Considerations

The Taylor Yard G2 River Park Project is set apart from other open space projects in scale and complexity. Many layers have been analyzed, from urban constraints and habitat, to natural systems like hydrology, to providing a base for inserting circulation and

• programs. After the City and the consulting design team went through a process to determine project goals, and establishing the

guidelines and direction of the project, a set of site design constraints and opportunities were developed. The following diagrams depict three initial approaches to several pre-design investigations based on the site’s constraints and

• pportunities, and the location of major community-driven programming features. The constraints are fundamental to the

design as they often guide circulation and the location of programs. Site constraints include soil health and remediation, utilities and associated right of ways, the potential for high speed rail, the new Taylor Yard Pedestrian Bridge laydown area, access to the site, potential development, stormwater feature location, river hydrology and ARBOR setbacks, and site phasing. While we are still waiting for soil results and are in negotiations with rail and LADWP regarding the high-voltage powerlines currently located onsite, we have begun the preliminary siting of: 1) circulation including connecting to the neighborhoods and providing access to the river, 2) stormwater features, 3) how and where to set back the river, and 4) community-driven programs such as the location of an amphitheater, a river museum, and restoration areas, among others. While we have begun to forge an understanding of the proposed spatial arrangement, park program and activities, constraints,

• pportunities and overall site aesthetic, it is important to understand that these diagrams are considered pre-design approaches.

Spatial disposition could change based on input from stakeholders including associated agencies.

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Preliminary Site Design Concepts

Soft Edge

• Project Goals
• Public Input
• Community Survey
• Technical Constraints

Island Three Islands 35

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Next Steps

• September 2018 - Finalize Soil Testing
• November 2018 - Site Assessment Report of Findings
• December 2018 - Draft Remedial Action Plan
• Q1 2019
• Recommended Alternative
• Public Meeting to Review Recommended Alternative

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2017 2018 2019 2020 2021 Meetings Project Kick-off Quarterly TASC and CLC Meetings Public Meetings Work Plan (Authorized) Develop Preliminary Design Concepts Refine Design Concept Prepare Implementation Plan Soil Quality Analysis Develop Soil Sampling Work Plans Soil Sampling Prepare Soil Quality Report Prepare Soil Response Plan Next Tasks (Pending) Environmental Review Detailed Design - Interim Uses Construction (Possibly Phased) - Interim Uses Potential Programming

As needed 1 2 3 4 5

TAYLOR YARD G2 RIVER PARK - Project Schedule

Meeting Number Meeting Topics 1 Kick-off and background 2 Design concept alternatives and Preliminary assessment results 3 Recommended alternative 4 & 5 Project status updates

INCLUSIVE INSPIRATIONAL RESILIENT UNIQUELY LOS ANGELES

PEOPLE WATER HABITAT CONNECTIVITY SOIL HISTORY

AN OPPORTUNITY FOR INNOVATIVE OPEN SPACE DESIGN

THANK YOU!