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Site Location
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Get an interactive map
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EPA Region 9
>
Serving Arizona, California, Hawaii, Nevada, Pacific Islands and over 140 tribes
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Site Address:
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T 26S, R 10E, SEC 33, S1/2 MT DIABLO MER
PASO ROBLES, California
93446
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County: SAN LUIS OBISPO
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U.S. Congressional District: 20
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Population within one mile: 5,001-10,000
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Cleanup Impact Summary
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At each site, EPA assesses the risk to humans and the environment and determines the best approach
to address the risk. During initial site studies and cleanup, EPA determines if current human
exposures to contaminants are under control and takes actions to control any possible human
exposures until cleanup has been completed. Once complete, cleanup provides long-term human health
and environmental protection at the site.
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EPA is working to determine whether, under current conditions, there are any potential or actual human exposures to contaminants at this site.
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learn more about human
exposure conditions at this site >> (see glossary)
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The Problem: Contamination & Exposure
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Contamination
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Contaminants (i.e., hazardous substances, pollutants or contaminants) can be found in
several different types of materials on the site including soil and other solid-based
media and water or another liquid-based medium. (see glossary)
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EPA classifies contaminants found into groups or types.
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The extent and types of contamination at this site have not yet been extensively investigated.
Limited contaminated media and type of contamination information can be found in the
Site Narrative
provided at the time of site
listing on
the NPL.
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ATSDR ToxFacts information on contaminants
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Exposure
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At each site, EPA determines the possibility for human and ecological contact (i.e., exposure) with contaminants at the site. If the possibility for exposure to contamination exists, EPA conducts a study known as a risk assessment. During the risk assessment, EPA determines if the site poses a risk to humans, and if so, identifies actions that can be taken to control any possible exposure to humans until site cleanup has been completed. Once complete, cleanup provides long-term human health and environmental protection at the site.
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EPA is working to determine whether, under current conditions, there are any potential or actual human exposures to contaminants at this site.
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learn more about human
exposure conditions at this site >> (see glossary)
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^^ back to top | view glossary >>
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The Solution: Cleanup Process & Progress
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Cleanup Activities At This Site
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see glossary definitions for cleanup activities >>
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There are many stages of cleanup, including site study, remedy selection, remedy design, remedy construction, and post-construction. Activities undertaken early in the cleanup process focus on understanding problems at the site while those taken later in the cleanup process focus on physically addressing those problems identified.
Many NPL sites are large and complicated. These sites are often broken up into smaller areas to make cleanup easier and more manageable. These areas are called “Operable Units” or OUs (see glossary).
The chart below shows the different types of activities that are underway or complete at each of the cleanup areas (operable units) at the site. Some activities apply to the entire site, EPA assigns these activities to the site-wide operable unit (designated as OU 0).
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Cleanup Areas
(Operable Units)
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Removal *
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Study and Remedy Selection
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Remedy Design
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Remedy Construction
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Post-Construction
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OU 2
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OU 1
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OU 0
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* At many sites an action, called a “Removal Action” (see glossary), must be taken to eliminate immediate and near-term threats to human health and the environment. Removal actions do not occur at all sites.
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Community Involvement
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Superfund community involvement is the process of getting community members actively involved in the cleanup of a Superfund site.
Throughout a site cleanup, the Superfund law requires the EPA to give communities information about site progress and plans so that they can be actively involved in site cleanup decisions.
To find out more about community involvement activities at this Superfund site and how you can become involved in site cleanup/reuse decisions, please contact:
Angeles Herrera .
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Post-Construction
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Post-Construction (see glossary) is the stage following completion of the majority of physical cleanup. The goal of Post-Construction is to ensure that the cleanup provides for the long-term protection of human health and the environment.
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^^ back to top | view glossary >>
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Government Performance & Results Act (GPRA) Milestones
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EPA is required to report on the following milestones under the Government Performance & Results Act.
More information.
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see glossary definitions for GPRA milestones >>
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Milestone
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Status
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Final Site Assessment Decision
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Yes (09/23/2004)
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Final Remedy Selected
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No
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Human Exposure Under Control
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EPA is working to determine whether, under current conditions, there are any potential or actual human exposures to contaminants at this site.
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Contaminated Groundwater Migration Under Control
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At this site, EPA is still working to determine whether contaminated groundwater migration is under control.
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Construction Complete
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No
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