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

G2 TAYLOR YARD Pre-Design Update RIVER PARK TAYLOR YARD G2 RIVER PARK TECHNICAL ADVISORY STAKEHOLDER COMMITTEE COMMUNITY LEADERSHIP COMMITTEE September 6, 2018 http://lariver.org/G2 1 http://www.tayloryardg2.com/

G2 TAYLOR YARD Pre-Design Update RIVER PARK AGENDA Welcome and Introductions Project Update Community Workshop and Survey Results Update on Site Assessment Water Quality Improvement Opportunities Preliminary Design Concepts Next Steps 2

G2 TAYLOR YARD Pre-Design Update RIVER PARK Project Management Team Gary Lee Moore, PE, ENV SP City Engineer Deborah Weintraub, AIA, LEED AP Michael Affeldt Arturo Chavez Director, LARiverWorks Senior Advisor Chief Deputy City Engineer Christopher Johnson, PE, GE Program Manager Katie Doherty, PE Project Manager 3

G2 TAYLOR YARD Pre-Design Update RIVER PARK Project Partners California Departm ent of Toxic Substances Control 4

G2 TAYLOR YARD City of Los Angeles RIVER PARK Bureau of Engineering PRIME CONSULTANT Project Managem ent/ Leadership Urban Design & Landscape Architecture Mediterranean Landscape Civil Engineering Architecture Architecture Hydrology & Water Environm ental Hydraulics/ Botany, Biology & Quality Docum entation Inspections Natural Habitat Public Public Public Econom ic Soil Sam pling Engagem ent Engagem ent Engagem ent Developm ent Managem ent & Financing

TAYLOR YARD G2 LOCATION MILE 25 OF THE LARIVER 3 6

EXISTING Project Development and Activities in 2018 Jan Public Meetings Feb Community Survey Mar Internal Pre-Design Workshops April Geophysical Survey, Groundwater Monitoring ARBOR Study May Begin Site Assessments Concept June Mayor’s Briefing July Site Assessment Ongoing August Site Assessment Ongoing

G2 TAYLOR YARD RIVER PARK AGENDA Welcome and Introductions Project Update Community Workshop and Survey Results Update on Site Assessment Water Quality Improvement Opportunities Preliminary Design Concepts Next Steps 8

Community Site Tour and Workshop January 2018 9

Community Workshop Table Comments 10

EXISTING Community Survey Results 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 ARBOR Study • LA River - 84% reported having visited Concept 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. 11 11

EXISTING Community Survey Results Favorite Park Features Respondents were asked to select their top three: 64% - access to nature 53% - walking and hiking trails 35% - scenic views ARBOR Study Concept 12

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

Activities/Recreational Elements Park features preferred: 60%- Walking/Running/ Jogging 40% - Children’s Nature/Adventure Play 38% - Meadow and Picnicking ARBOR Study Concept 14

Taylor Yard – Site Use and Environmental History Rail Operations - Equipment Maintenance and Fueling: • Early 1900’s – 2006 • Former facilities: Service Tracks Diesel Shop Machine Shop -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 Aerial Photo of Historical Rail Operations (c 1994) 16

2018 Site Investigation (Began Summer 2018) “What are we investigating?” 17

2018 Site Investigation (Began Summer 2018) “What are we investigating?” GROUNDWATER SAMPLING: • 22 samples from 16 monitoring wells SOIL GAS SAMPLING: • 228 sample locations Mobile Laboratory for Soil Gas Analysis • 452 total samples SOIL SAMPLING: • 78 locations • 645 total samples EXCAVATION TEST PITS: • 23 pit and trench excavations Direct Push Equipment for Soil Sampling 18 18

Site Assessment: “What Are We Looking For?” Split Spoon • Petroleum hydrocarbons Sampler (TPH) Showing TPH Contamination • Metals • Volatile Organic Compounds (VOCs) • Semi-volatile organic Field Notebooks compounds (SVOCs) • Pesticides/herbicides • Polychlorinated Biphenyls (PCBs) Split Spoon Sampler Showing Soil Stratification 19

Site Design Implications: “What Is The Remedy?” 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 20

G2 TAYLOR YARD RIVER PARK Water Quality Improvement Opportunities • Regulatory Framework • Tributary Watersheds • Treatment Alternatives • Infiltration • Conclusion 22

G2 TAYLOR YARD RIVER PARK Regulatory Framework • National Pollutant Discharge Elimination System Permit • Beneficial Uses • Impaired Water Bodies • Pollutants of Concern • Total Maximum Daily Load Taylor Yard 23

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

EXISTING Storm Drains Relevant to Taylor Yard Parcel G2 • Project 480 • Eagle Rock Drain • City UPRC Drain 29901 ARBOR Study • City Drain 1805 Concept

G2 TAYLOR YARD RIVER PARK Land Use in Drainage Subareas Tributary to G2 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 - 26

G2 TAYLOR YARD RIVER PARK Stormwater Quality Treatment Strategy Hydrodynamic Sedimentation Treatment Trash Removal Pond Stream* Unit Trash √ √ Ammonia √ Copper √ √ Toxicity √ √ Indicator √ Bacteria √ Nutrients (Algae) *Treatment Stream: Swales, Dry Creek, Bioretention, Wetlands 27

EXISTING Treatment Area Exhibit Onsite Flow Only • Onsite stormwater runoff drains by gravity to “dry” creek. • Dry creek is lined Onsite + Eagle Rock to prevent ARBOR Study infiltration into underlying soils. Concept • Treated runoff discharged to River via outfall structure • No pumping.

Treatment Area EXISTING Exhibit (Recommended) Onsite + UPRC (Wet Weather) + Eagle Rock ( Dry Weather) • Drain on-site surface stormwater runoff by Onsite + Eagle Rock gravity to “dry” creek ARBOR Study and detention pond. • Drain flows (4 cfs) Concept pumped by solar pumps into dry creek • Creek and pond lined to prevent infiltration. • Treated runoff discharged to River via outfall structure. 29

EXISTING Treatment Area Exhibit for Wet Weather Flows Onsite + UPRC Wet Weather (85 th Percentile) + Eagle Rock Wet Weather (85 th Onsite + Eagle Rock Percentile) ARBOR Study Concept Stormwater management system utilizes ~41 of the 42 acre site. 30

EXISTING Stormwater Infiltration – Not Recommended San Fernando Valley Super Fund Site • Volatile Organic Compounds • trichloroethylene (TCE) • perchloroethylene (PCE) • carbon tetrachloride ARBOR Study • 1,2-dichloroethane • cis -1,2-dichloroethene Concept • 1-dichloroethane • Metals • Chromium • Pesticides Taylor Yard • Atrazine Pollock Treatment Plant 31

G2 TAYLOR YARD RIVER PARK 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. 32