esm223_04_Other_Reading_EPA_Soil_Screening_Levels

esm223_04_Other_Reading_EPA_Soil_Screening_Levels -...

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Attachment A Conceptual Site Model Summary
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Attachment A Conceptual Site Model Summary Step 1 of the Soil Screening Guidance: User’s Guide describes the development of a conceptual site model (CSM) to support the application of soil screening levels (SSLs) at a site. The CSM summary forms at the end of this attachment contain the information necessary to: Determine the applicability of SSLs to the site Calculate SSLs. By identifying data gaps, these summary forms will help focus data collection and evaluation on the site-specific development and application of SSLs. The site investigator should use the summary forms during the SSL sampling effort to collect site-specific data and continually update the CSM with new information as appropriate. The CSM summary forms indicate the information required for determining the applicability of the soil screening process to the site. Forms addressing source characteristics may be photocopied if more than one source is present at a site. A site map showing contaminated soil sources and exposure areas (EAs) should be attached to the summary. If available, additional pages of other maps, summaries of analytical results, or more detailed descriptions of the site may be attached to the summary. Form 1. General Site Information The information included in this form is identical to the first page of the Site Inspection (SI) Data Summary form (page B-3 in Guidance for Performing Site Inspections Under CERCLA , U.S. EPA, 1992). However, the form should be updated to reflect any site activities conducted since the SI was completed. Form 2. Site Characteristics Form 2 indicates the information necessary to address the migration to ground water pathway and identify subsurface conditions that may limit the applicability of subsurface SSLs. A hydrogeologic setting is defined as a unit with common hydrogeologic characteristics and therefore common vulnerability to contamination. Each setting provides a composite description of the hydrogeologic factors that control ground water movement and recharge. These factors can be used to make generalizations in the CSM about ground water conditions. After placing the site into one of Heath's ground water regions (Heath, 1984), consider geologic and geomorphic features of the site and select a generic hydrogeologic setting from Aller et al. (1987) that is most similar to the site. If existing site information is not sufficient to definitively place the site in a setting, it should be possible to narrow the choice to two or three settings that will reduce the range of values necessary to develop SSLs. A copy of the setting diagram from Aller et al. (1987) should be attached to the CSM checklist to provide a general picture of subsurface site conditions. Ground Water Flow Direction
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This note was uploaded on 08/06/2008 for the course ESM 235 taught by Professor Dunne during the Winter '08 term at UCSB.

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esm223_04_Other_Reading_EPA_Soil_Screening_Levels -...

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