skypark commercial properties community update
TRANSCRIPT
SKYPARK COMMERCIAL PROPERTIES COMMUNITY UPDATE
Los Angeles Regional Water Quality Control BoardRemote Community Meeting
July 30, 2020
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• Welcome and Introductions
• Meeting Ground Rules: How to
Participate
• Presentation
• Questions and Answers
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AGENDA
Los Angeles Regional Water Quality Control Board Chair
Irma Muñoz
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WELCOME
Type your question in the “Q&A” feature on the screen
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HOW TO PARTICIPATE
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LOS ANGELES REGIONAL WATER QUALITY CONTROL BOARD’S ROLE
• Who is the Los Angeles Regional Water Quality Control Board?
• Mission Statement
• What do we do?
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OFFICE OF ENVIRONMENTAL HEALTH HAZARD ASSESSMENT’S ROLE
• Who is the Office of Environmental Health Hazard Assessment (OEHHA)?
• Mission Statement
• What do we do?
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• Site Background and Overview• Regulatory History• Results of Investigation Completed• Vapor Intrusion Overview• Screening Level Overview• Next Steps• Schedule
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PRESENTATION OUTLINE
SKYPARK COMMERCIAL PROPERTIESSITE MAP
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SKYPARK COMMERCIAL PROPERTIES PROJECT OVERVIEW
• Hi-Shear Corporation Property(2600 Skypark Drive)• Manufactures fasteners for
the aerospace industry• Volatile organic compounds
(VOCs) leaked into theground contaminating soil, soilvapor, and groundwater
• Robinson Helicopter Property (2530 and 2540 Skypark Drive)
• Manufacture of rotorcraft and related components
• VOCs stored and used are sources of contamination
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• Dasco Engineering Property (24707, 24747, and 24701 Crenshaw Boulevard)
• Manufacture of rotorcraft and precision mechanical aircraft and space components
• VOCs stored and used are sources of contamination
• South Bay Lexus Property (24777 and 24751 Crenshaw Boulevard)
• Historical operations include manufacturing of aircraft, missiles and their components
• VOCs stored and used are sources of contamination
SKYPARK COMMERCIAL PROPERTIES PROJECT OVERVIEW
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1991-Site investigation began
1999-Soil vapor extraction (SVE) system commenced operation at the Hi-Shear property
2009-Order requiring investigation issued to Hi-Shear
2013-Tested enhanced bioremediation to remediate VOCs in groundwater
2018-Soil, Soil Vapor and Groundwater Delineation Work Plan submitted
2019-Soil, Soil Vapor and Groundwater Delineation Workplan approved
2020 Order requiring investigation of east adjacent properties of Hi-Shear Order requiring vapor intrusion assessment of Skypark Commercial Properties
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REGULATORY HISTORY SUMMARY
HOW DOES CONTAMINATION SPREAD AT A SITE?
Release at site
Impacts to soil
Impacts to soil vapor
Impacts to groundwater
Image from Livingston County Health Department
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Volatile Organic Compounds (VOCs)• Chemicals that pass easily from a liquid
into a gas state• Commonly used in industry and in the
home• VOCs in soil and groundwater can
evaporate as vapors and can collect underbuildings potentially affecting the qualityof indoor air
Trichloroethylene (TCE)• VOC used for degreasing metal parts• Also used in consumer products
Tetrachloroethylene (PCE)• VOC used in clothes dry cleaning and
metal degreasing• Also used to make other chemicals and
found in some consumer products
• Air fresheners, candles, perfume• Hairspray, hair dye, aerosolized
products• Paints, varnishes and lacquers • Adhesives, glues, markers• Cleaning agents (e.g., bleach,
ammonia)• Rubber cement and epoxy adhesives• Paint and stain removers• Carpet/rug/upholstery cleaners • Refrigerant• Insecticides, fungicides and
pesticides• Flame retardant fabrics • Furniture polish and floor polish • Dry cleaning chemicals
Source- California Water Boards
COMMON HOUSEHOLD SOURCES OF VOLATILE ORGANIC
COMPOUNDS
WHAT ARE VOCs?
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2018 Work Plan Scope of Work
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Soil Vapor Probe Locations
2018 Work Plan Scope of Work
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Groundwater Monitoring Well Locations
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SOIL VAPOR INVESTIGATION RESULTS TO DATE
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SOIL VAPOR INVESTIGATION RESULTS TO DATE
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SOIL VAPOR INVESTIGATION RESULTS TO DATE
GROUNDWATER INVESTIGATION RESULTSTO DATE
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GROUNDWATER INVESTIGATION RESULTSTO DATE
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Source: CalEPA
VAPOR INTRUSION CONCEPTUAL MODEL
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Toxicity Exposure (Dose)
Acceptable Risk Level
Screening Level
SCREENING LEVELS (SL)
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• Prioritize efforts where the most significant problems have been identified at contaminated sites
• A chemical present at concentrations above its corresponding SL does not mean there is an immediate threat but it does mean additional evaluation is generallynecessary
• SLs are very stringent and have multiple levels of assumptions built in to be protective of public health
• SLs are updated periodically
SCREENING LEVELS (SL)
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Long-Term Exposure ScreeningLevels
Short-Term Exposure Screening Levels
TCESub-slab/Soil Vapor Indoor Air
Residential 16 µg/m3 0.48 µg/m3
Commercial 100 µg/m3 3 µg/m3
PCESub-slab/Soil Vapor Indoor Air
Residential 15 µg/m3 0.47 µg/m3
Commercial 67 µg/m3 2 µg/m3
TCESub-slab/Soil Vapor Indoor Air Exposure—
Accelerated
Indoor Air Exposure
Exposure—Urgent
Residential 67 µg/m3 2 µg/m3 6 µg/m3
Commercial 267 µg/m3 8 µg/m3 24 µg/m3
SCREENING LEVELS
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NEXT STEPS
• Complete the work proposed in the 2018 Work Plan
• Conduct indoor air and subslab vapor sampling of select commercial and residential properties
• Resume onsite remediation at the Hi-Shear Property
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AREA TO BE EVALUATED FOR VAPOR INTRUSION
Indoor Air and Subslab Vapor Locations
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AREA TO BE EVALUATED FOR VAPOR INTRUSION
INDOOR AIR AND SUBSLAB SAMPLING
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Sampling Process
Indoor Air Samples Building survey: pre-
sampling questionnaire Identification of
household items that contain VOCs
Placement of canisters in targeted areas
Leave canisters for 24-hours to collect air(8-hours for business)
Return to retrieve canisters
Sub-slab (directly beneath foundation, typically in garage) or perimeter soil vapor samples collected (outside) for correlation with indoor air samples
Source: Santa Ana Regional Water Quality Control Board
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• Air purifiers
• Sealing openings- filling in cracks in the floor slab and gaps around pipes and utility lines
• Vapor barriers- placing sheets of strong plastic beneath a building to prevent vapor entry
• Passive venting-installing a venting layer beneath a building
• Sub-slab depressurization- connecting a blower to a small suction pit dug into the slab to vent vapors outdoors
VAPOR INTRUSION MITIGATION MEASURES
Source: Santa Ana Regional Water Quality Control Board
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2nd Half of 2020 Complete work proposed in the 2018 Work Plan Conduct subslab vapor and indoor air sampling at the
following areas: Hi-Shear property Robinson Helicopter, Dasco Engineering and South
Bay Lexus properties Accelerated response zone between Crenshaw Blvd
and 247th and 248th St in the City of Lomita Resume operation of the SVE system at the Hi-Shear
property 2021
Continue vapor intrusion assessment Conduct interim remediation Public Meeting
Upcoming Work Activities
Type your question in the “Q&A” feature on the screen
QUESTIONS & ANSWERS
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Q&A PANELISTS• Dr. Arthur Heath, PhD: Site Cleanup Program Manager, LA
Water Board
• Jillian Ly, PE, PMP: Site Cleanup Program Unit 4 Chief, LA Water Board
• Dr. Jim Carlisle, DVM, MSc: Toxicologist, Cal EPA Office of Environmental Health Hazard Assessment (OEHHA)
• Tamarin Austin: Attorney, Office of Chief Counsel, State Water Board
• Steve Van der Hoven, PhD, PG: Environmental Consultant for Hi-Shear, Genesis Engineering and Redevelopment
For questions or additional information regarding the Skypark Commercial Properties, please contact:
Jillian Ly, PE, PMPSenior Water Resource Control [email protected] or (213) 576-6664
Susana Lagudis (se habla español)Public Participation [email protected] or (213) 576-6694
MEETING EVALUATIONUse the following https:https://www.surveymonkey.com/r/Q2956YVor hold your mobile phone to the screen and use a QR Code reader to complete the meeting evaluation
CONTACT INFORMATION
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