user's guide and background technical document for the nevada ...

August, 2010
1. Email contact for questions or errors updated.
2. Typographical errors corrected.
3. BCL Spreadsheet updated to reflect correct BCLs for dioxin TEQs.
4. Removed route-to-route extrapolations for inhalation toxicity criteria including Table B-
1.
5. Clarification that air BCLs are for outdoor air only. Indoor air is not addressed by BCLs.
6. PAH BaPEqs methodology clarified to direct user to include all seven carcinogenic PAHs
if one or more are detected in site media.
7. 2-Hexanone added to BCL spreadsheets.
8. Updated BCLs with additions of surrogate-based inhalation toxicity values as provided in
Table B-2.
9. Corrected the tapwater BCLs to reflect MCLs when available.
10. Updated Industrial/Commercial worker BCLs for 8 of 24 hours (as appropriate).
January, 2011
1. Minor typographical errors corrected for various entries.
2. Toxicity criteria values updated.
3. For 2,3,7,8-TCDD (1746-01-6), there were two entries in the BCL table and BCL
calculation sheet for this chemical, one labeled “Dioxin (2,3,7,8-TCDD)” and another
labeled “2,3,7,8-TCDD (Dioxin).” The entry labeled “Dioxin (2,3,7,8-TCDD)” was
deleted from the BCL table and the BCL calculations.
4. For octahydro-1357-tetranitro-1357-tetrazocine (HMX) (2691-41-0), there were two
entries in the BCL table and BCL calculation sheet for this chemical, one labeled “HMX”
and another labeled “octahydro-1357-tetranitro-1357-tetrazocine (HMX).” The entry
labeled “HMX” was deleted from the BCL table and the BCL calculations.
5. Four chemicals were added to the BCL tables and BCL calculation tables: 1,2dichlorotetrafluorethane
(1717-00-6), ethanol (64-17-5), n-heptane (142-82-5), and noctane
(111-65-9). All four are VOCs and surrogate RfC values were used.
January, 2012
1. NDEP approved HCH reference doses included in the BCL tables.
2. Equations C, D, and E were edited for minor corrections in Section 4.0.
3. Toxicity criteria values updated.
4. Tap water BCLs for VOCs were corrected for a calculation error.