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• • - Tier 'I <br /> Look-Up Table <br /> �z r ,p s'� m s; -, as .-'.`'a,�, r �'3-�i�+���.x➢..`� �.� �„�z-��-: n <br /> A.-'r TIER T SPREAQ EET DESCRlPTI41�f`' <br /> Tier�l The Tier 1 Look-Up Table is accessed by the "Tier 1 Levels" <br /> Levelsx button on the main screen of the RISC interface Selecting this <br /> button will bring up an Excel spreadsheet containing a Tier 1 spreadsheet based on the <br /> algorithms presented in the ASTM RBCA standard <br /> The spreadsheet is organized into a number of worksheets There are two ways to <br /> navigate through the spreadsheet (1) using the "Main Menu" the user can click on <br /> buttons to switch from one worksheet to another (each sheet has a button to return to <br /> the Main Menu), and(2)using the labeled worksheet tabs at the bottom of each Excel <br /> screen <br /> Table H-I shows the Main Menu worksheet and Table H-2 shows the Inputs sheet <br /> with the labeled tabs at the bottom of the Excel screen <br /> The worksheet, titled "Inputs", contains the input variables that may be changed by <br /> the user The worksheet, "RBSLs" (risk-based screening levels) contains the Tier 1 <br /> nsk-based screening levels The chemical database is in the worksheet entitled <br /> "Chemical DB" <br /> • <br /> H-t <br />