What's New

What's The What's New section keeps users informed of changes to: toxicity values, exposure parameters, chemical-specific parameters, equation formats and any other SL changes. Please check this site frequently to be advised of any recent changes.

April 15, 2009

New Tables generated that reflect changes from all the toxicity sources used in the toxicity hierarchy. This spreadsheet file (or this pdf file (PDF) (23 pp, 84.4k) is a comparison of the previous toxicity database to the current.
The User's Guide has been updated.

The generic tables no longer provide individual SLs for dioxin-like congeners. The User's Guide provides instructions on how to apply the TEFs.
RAGS Part F guidance has been incorporated into the FAQ and User's Guide.
The OSWER Cancer Handbook guidelines have been incorporated into a new section in the user guide addressing mutagens (Section 5.14).
A detailed discussion of the sources of Kd values has been added to Section 4.9 of the User's Guide.
Section 5.12 was added to the User's Guide to address potential methods of screening sites with multiple contaminants.

The FAQ has been updated in response to user guestions.

October 16, 2008: Summary of Changes Posted

Spreadsheet of changes (XLS)
Notes about the Spreedsheet of changes
1) purple row = chemical no longer in table due to no values
2) green row = chemical added
3) yellow boxes = differences
For the yellow differences, prior (June) value is on top and current
(September) value is below. Letter differences are due to change in tox
source and possible tox value. Note the "C" iur values which were in
wrong units from CALEPA but are correct now.
Most metals differ in soil to groundwater calculations. All PCBs/Dioxins
that have "W" have been modified with newer TEF."

September 12, 2008

New Tables generated that reflect the addition of several PPRTVs. Beta designation is removed.

July 7, 2008

New Tables generated that reflect the addition of the Cal EPA IUR for Naphthalene.

July 3, 2008

New Tables generated that reflect the correction of the IUR for Ethylene oxide.

July 2, 2008

New Tables generated that reflect the removal of the CalEPA RfC for Trichloroethylene (TCE). After careful consideration, it was determined that the resulting noncancer screening level may not be protective of non-carcinogenic effects.

June 20, 2008

New Tables generated that corrected the usage of the "nc" and "ca**" designation in the Summary Table for Tapwater.

June 17, 2008

New Tables generated that corrected the usage of the "ca**" designation in the Summary Table.

June 13, 2008

Some duplicate rows were removed from the residential tapwater supporting table.

May 2008

Website open as a Beta release.
The lead action level presented in the Generic Tables was changed from 0.015 to 15 ug/L.
The copper action level presented in the Generic Tables was changed from 1.3 to 1300 ug/L.
The labels for adult and child body weight in the Calculator output were corrected.
The target risk labels in the Resident Air Supporting Table were corrected.
The Inhalation Unit Risk for TCDD was changed to 38 and the Generic Tables were updated.

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For assistance/questions contanct Dave Crawford or Fred Dolisslager

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