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The Office of Environmental Health Hazard Assessment (OEHHA) of the California Environmental Protection Agency is making available a revised version of the Excel® spreadsheet "Schoolscreen" implementing the OEHHA Guidance for Assessing Exposures and Health Risks at Existing and Proposed School Sites (Guidance). This Guidance was prepared to comply with California Health and Safety Code Section 901(f), which requires OEHHA to develop and publish a guidance document for use by the Department of Toxic Substances Control and other state and local environmental and public health agencies to assess exposures and health risks at existing and proposed school sites, and including child-specific routes of exposure unique to the school environment, in addition to those in existing exposure models.

In the original "Schoolscreen" spreadsheet, the annual average daily dose and the reference dose were not in the same units, resulting in error in calculating the hazard quotients. Also, the dermal absorption coefficient was not incorporated into the dermal dose calculation. This error affected both hazard quotients and cancer risk, although the affect would not affect the answer expressed to 2 significant digits. We regret any inconvenience this error may have caused.

Follow this link to download a copy of the Excel Spreadsheet (updated 07/12/06).

If you would like to receive further information on this announcement or have questions, please contact our office at (916) 324-2829 or the address below. Written requests should be addressed to:

Mr. Leon Surgeon
Integrated Risk Assessment Section
Office of Environmental Health Hazard Assessment P.O. Box 4010
1001 I Street, 12th Floor
Sacramento, California 95812-4010
FAX: (916) 322-9705

Follow this link to download a copy of the document: Guidance for Assessing Exposures and Health Risks at Existing and Proposed School Sites Pursuant to Health and Safety Code § 901(f)

Follow this link to download a copy of this notice

The algorithms and equations in the Guidelines for Assessment of Exposure and Risk at Existing and Proposed School Sites (Guidelines) have been incorporated into an Excel spreadsheet. The spreadsheet also contains toxicological data for approximately 370 chemicals an physical chemical data for approximately 90 chemicals. Soil vapor and human milk exposure pathways cannot be evaluated for chemicals with incomplete databases. The user is responsible for data added to the spreadsheet. The authors believe the algorithms to be an accurate reflection of the Guidelines
The Workbook and all sheets are protected to avoid inadvertent changes. No password is required to unprotect the sheets or the workbook.

This spreadsheet is a work in progress. As significant data are added or changes made, new versions will be released.

Follow this link to download a copy of the Excel Spreadsheet (updated 07/12/06)

Note: An error has been discovered in the “fate” sheet of the previous version of Schoolscreen.
The error, which resulted in a nearly 1000-fold underestimate of the indoor air concentration resulting from vapor intrusion, has been corrected in the current version (07/12/06).

You will need the free program Adobe Acrobat Reader to view or print PDF files

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