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 A scoping report, presenting the results of the scoping assessment, is required.
A standard checklist and scoping report outline are provided in the guidance
document. At the end of a Level I scoping assessment, a decision is made to
determine if no further ecological investigation is necessary or if the assessor
should proceed to Level II.
Document:
"Guidance for ecological risk assessment: Level II: B Screening"
(Oregon DEQ 1997b).
The first step in a Level II screening assessment is to evaluate whether the
information from the Level I scoping assessment is sufficient for a Level II
problem formulation. If not, the assessor must conduct a site survey to supplement
the Level I data. If there is sufficient information, the assessor proceeds to the next
step, which is a site description update. This update is a more-detailed description
and analysis of the ecological conditions at and near the site than that in Level I.
After the site description is complete, site-specific ecological receptors must be
identified, preferably for each habitat type. The COIs from the Level I assessment
are then screened based on the frequency of detection, background concentration,
toxicity criteria, and bioaccumulation potential of each compound to select
contaminants of potential ecological concern (CPEC). The next steps are:
a. Identification of assessment end points.
b. Identification of complete exposure pathways.
c. Identification of known ecological effects.
From the above screening steps, a preliminary conceptual site model is
developed and presented in both a graphical and narrative form. A report
presenting the results of the Level II screening assessment must then be written,
and a decision must be made as to the next course of action. At this level, there
are three options:
1. No further action.
2. Response or remedial action.
3. Proceed to Level III.
"For a site to present a potential for risk, it must exhibit the following three
criteria:
(a) contain CPECs in abiotic media at detectable and biologically significant
concentrations,
(b) provide exposure pathways linking CPECs to ecological receptors, and
(c) have ecological receptors (those associated with assessment endpoints) that
either utilize the site, are present nearby, or are in the locality of CPECs
migrating from the site."
A25
Appendix A Summary of Federal, State, and Regional Guidance
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