Do you know any software which could be an alternative to the RBCA software toolkit for chemical releases to perform risk assessment evaluations?
It can be helpful for you:
http://www.sadaproject.net/risk_assessment.html
Download:
http://www.sadaproject.net/download.html
It all depends on what guidance you want to follow. SADA is OK, but it is rather cumbersome and the toxicity values aren't updated very frequently.
If you want to perform a USEPA-style risk assessment, the easiest method is probably USEPA's own Regional Screening Level calculator. Toxicity values are also updated every 6 months to the latest USEPA toxicity values. You can find it here: http://epa-prgs.ornl.gov/cgi-bin/chemicals/csl_search
The UK has their own methodology and software, which you can get here: https://www.gov.uk/government/collections/land-contamination-technical-guidance
In the US, several states and regions have their own software (e.g., Hawaii's EAL surfer at http://eha-web.doh.hawaii.gov/eha-cma/Leaders/HEER/environmental-hazard-evaluation-and-environmental-action-levels).
Generally, however, the equations are simple enough that one usually just programs them into Excel for almost everything - except some of the more complicated fate and transport modeling.
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