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This ecological risk assessment (ERA) is a supplement to the human health risk assessment (HRA) for the Explosive Waste Treatment Facility (EWTF). The EWTF is located near the center of Site 300 in a small, isolated canyon (see Figures 2 through 6 in the text). The ERA described in detail in Appendix B was prepared in accordance with guidance on currently accepted practice provided by the Human and Ecological Risk Division (HERD) at the Department of Toxic Substances Control (DSTC) of the State of California Environmental Protection Agency (CalEPA) in Sacramento, California. The technical basis for this ERA is an analysis that involves a series of screening calculations to assess each of 21 contaminants of potential ecological concern (CPECs) for its potential to produce an adverse ecological impact in particular wildlife species, including vegetation, considered representative receptors of ecological interest (RREI) in the trophic levels of the food network at Site 300. This series of screening calculations is designed to illustrate whether CPECs identified as being of possible consequence in the most conservative screening calculation actually may be of lesser or no significance when more information is considered in subsequent screening calculations

Description of Spreadsheet Calculations for Populating Data Tables of the Ecological Risk Assessment (Appendix B of the Human Health and Ecological Risk Assessment Document) for the Explosives Waste Treatment Facility (EWTF) at Site 300