HomeMy WebLinkAboutAscon Landfill Site - Study Session (Power Point) presentati 4
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Ascon Landfill Site -Ij ;
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presented by
The Department of Toxic Substances Control
City of Huntington Beach
Council Study Session
May 5, 2003 ;
5:00 p.m.
Statewide Cleanup Operations
Division of DTSC
• Protect public health and address
environmental threats posed by the
contaminated site.
• Responsible for overseeing cleanup
activities at hazardous substances release
sites.
• Identify and implement, as appropriate,
proper cleanup activities at sites where
releases of hazardous substances have
occurred.
Overview of Site Mitigation Process
Remedial Investigation
Preliminary Endangerment Health Risk Assessment
Assessment (PEA) Feasibility Study
Site Remedial Action Plan
Characterization (RAP)
Remedial Design
Removal Action rImplementation
Workplan (RAW)
Certification
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Operation and Maintenance
Ascon Landfill Site
Location Map
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Recent Site Activities
• June 2001 : Remedial Investigation /
Feasibility Study for soil/waste was
approved by DTSC.
• January 2003: Consent Order between
DTSC and a group of 7 Responsible
Parties became effective.
• March 2003: Unilateral Order, issued by
DTSC to 2 Responsible Parties, became
effective.
Remedial Investigation (RI)
The RI is the phase of the cleanup
process to
- determine the type of contamination,
- determine the extent of contamination,
and
- evaluate potential health & ecological
risks.
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RI Results for Soil/Waste
• Contaminated soil and waste materials have
compounds consistent with historical disposal
records and other types of industrial waste.
• Some concentrations of chemicals were above
state and federal preliminary cleanup levels and
hazardous waste levels.
• It appears VOCs (volatile organic compounds)
are not migrating off-site in the subsurface via
the soil vapor phase.
• Groundwater beneath the Site is contaminated.
Health Risk Assessment
• The process of examining the available
evidence on health effects associated with a
particular chemical and relating the
probability of adverse health effects to a
given exposure level.
• It is not a public health assessment of the
causes of health effects in a community.
• It is not an epidemiological study of cancer
rates in a community.
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Summary of
Health Risk Assessment &
Ecological Screening Assessment
• Noncancer health effects are not likely to occur
to off-site residents, school children or workers.
• Maximum cancer risks to off-site residents are
approximately five in one hundred thousand
based on revised air pathway results.
• On-site hazards and cancer risk exceed
regulatory thresholds for workers and potential
residents.
• Contact with wastes may harm wildlife.
Feasibility Study (FS)
• The FS is the phase of the cleanup
process which identifies and evaluates
various cleanup options.
• The FS develops cleanup objectives and
evaluates cleanup options to reduce
potential health risks.
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The FS for Soil/Waste
• Cleanup objectives:
- reduce human health risks
- reduce risks to the environment
- mitigate on-site sources that may cause
the deterioration of groundwater quality
- comply with ARARs (applicable or relevant
and appropriate requirements)
- allow future site use consistent with its
designated zoning
The FS for Soil/Waste (cont.)
• Cleanup alternatives:
- Alternative 1 — No Action;
- Alternative 2 — Containment with a subsurface
wall around the perimeter of the Site & a cap
with a vegetative cover; and
- Alternative 3 — On-site treatment and removal
of waste.
• Alternative 3 appears to be the most suitable
cleanup option as it meets the cleanup
objectives and better meets the nine evaluation
criteria.
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The FS for Soil/Waste (cont.)
• Alternative 3:
- Removal of soil and liquid, and on-site
treatment of contaminated material
- After design & engineering plans are
completed, approximately 3 years to
implement with 2 of those years for the main
cleanup activities
- Eliminate or reduce the identified potential
risks to acceptable levels suitable for
unrestricted use
Summary of the RI/FS for
Soil/Waste
• The nature and extent of contamination
was determined during the RI.
• Based on a health risk assessment,
cleanup of the soil/waste is necessary.
• Cleanup options were evaluated in the FS.
• Alternative 3 meets the cleanup objectives
and appears to be the most suitable
cleanup option.
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Future Site Activities
• Soil/Waste
- Draft Remedial Action Plan (RAP)
- Environmental Impact Report (EIR)
- Public comment period on both
documents
- Remedial Design
- Cleanup activities
Future Site Activities (cont.)
• Groundwater
- Remedial Investigation / Feasibility Study
• Air
- Air sampling program
- Air monitoring during cleanup activities
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Estimated ule Of Activities
2003 2004 2005 2006 2007 2008
ID Task Name Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 103 1 Q4
1 Consent Order becomes effective
............... ....... ............................ ............ ......
2 Unilateral Order becomes effective
.... .......... --.
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4 SOILMIASTE ACTIVT~µIES
.................... _.. .................................... ...........................
...... ...
5 Remedial Action Plan
6 Environmental Impact Report
7 Remedial Design
8 mm Cleanup Activities
. ............................__..........................................._..........__..........._............................................
........- € '•
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10 GROUNDWATER ACTIVITIES
11 Remedial Investigation/Feasibility Study
.......
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13 AIR ACTIVITIES
14 Air sampling program
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Points of Contact
• DTSC
- Christine Chiu, Project Manager
714.484.5470 or cchiu aadtsc.ca.gov
- Derrick Alatorre, Public Participation Specialist
714.484.5474 or dalatorr _dtsc.ca.gov
- Jeanne Garcia, Public Information Officer
818.551 .2176 or jgarcia(a�dtsc.ca.gov
Points of Contact (cont.)
• Cancer Surveillance Program of Orange County
- Thomas Taylor, Ph.D.
949.UC1.6903 or thtaylorQuci.edu
• CA Department of Health Services
Environmental Health Investigations Branch
- Greg Braun
510.622.4500 or gbrauna-dhs.ca.gov
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