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Contact Superfund, Pacific Southwest

Pacific Southwest, Region 9

Serving: Arizona, California, Hawaii, Nevada, Pacific Islands, Tribal Nations

Santa Susana Field Laboratory Remedial Site Assessment

The Preliminary Assessment/Site Inspection (PA/SI) report summarizes the findings of preliminary investigative activities for use in the Hazardous Ranking System model (HRS). This PA/SI assesses the whole SSFL site and evaluates both chemical and radiological contaminates.

The HRS uses a structured analysis approach to scoring sites. This approach assigns numerical values to factors that relate to risk based on conditions at the site. The factors are grouped into three categories:

  • likelihood that a site has released or has the potential to release hazardous substances into the environment;
  • characteristics of the waste (e.g. toxicity and waste quantity); and
  • people or sensitive environments (targets) affected by the release.

Four pathways can be scored under the HRS:

  • ground water migration (drinking water);
  • surface water migration (drinking water, human food chain, sensitive environments);
  • soil exposure (resident population, nearby population, sensitive environments); and
  • air migration (population, sensitive environments).

After scores are calculated for one or more pathways, they are combined using a root-mean-square equation to determine the overall site score.

Site Assessment Report and Supporting Documents

You will need Adobe Reader to view some of the files on this page. See EPA's PDF page to learn more about PDF, and for a link to the free Adobe Reader.

Remedial Site Assessment Decision (PDF) (2 pp, 116K)

Field Laboratory Completion Fact Sheet (PDF) (2 pp, 83K)

SSFL PASI Report - r2 complete (PDF) (52 pp, 6.43MB)

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