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Investigation-Derived Waste

NDEP Correspondence

January 11, 2008 — NDEP letter to TIMET regarding Investigation Derived Wastes

Attachment A

June 26, 2007 — NDEP Letter: BMI Plant Sites and Common Areas Projects, Henderson, Nevada Advisement Regarding RCRA and Underlying Hazardous Constituents (UHCs)

Radionuclides

January 29, 2008 — NDEP Advisement Regarding Radionuclide Analyses
December 07, 2007 — NDEP Letter: BMI Plant Sites and Common Areas Projects, Henderson, Nevada Advisement Regarding Radionuclide Analyses for Uranium

Data Quality

Cation-Anion Balances

May 21, 2007 — NDEP letter to the Companies providing Additional Guidance on Completion of Quality Checks for Cation-Anion Balance

Data Validation

May, 3, 2006 — NDEP letter to the Companies’ providing: Guidance on Data Validation Procedures
February 23, 2007 — NDEP letter to the Companies’ providing: Additional Guidance on Data Validation Procedures

Data Usability

NDEP Guidance forthcoming

Asbestos and Asbestos-specific Risk Assessment

Remedial Technologies

January 2008 — A Systematic Approach for Evaluation of Capture Zones at Pump and Treat Systems [USEPA 166 Pages 19MB]

Risk Assessment and Toxicology

Organic Acids

November 16, 2007 — report from Stauffer Management Company re: toxicological profiles for three organic acids
January 18, 2008 — NDEP letter regarding toxicological profiles of organic acids
Attachment 1
January 25, 2008 — supplemental information from Stauffer Management re: toxicological profiles for three organic acids
February 12, 2008 — NDEP letter regarding toxicological profiles of organic acids

DEPT and DMPT

August 29, 2006 — NDEP letter to the Companies regarding the derivation of toxicological surrogates for DEPT and DMPT.

November 1, 2006 — Report from the Companies regarding the derivation of toxicological surrogates for DEPT and DMPT
November 27, 2006 —NDEP comments on November 1, 2006 report on DEPT and DMPT

February 12, 2007 — NDEP concurrence regarding the derivation of toxicological surrogates for DEPT and DMPT.

Ecological Risk Assessment

October 11, 2006 — NDEP Guidance on Ecological Risk Assessment - Screening Level Ecological Risk Assessment Guidelines [NDEP 148 Pages 1MB]

Comparison Levels

April 21, 2008 — NDEP Guidance Regarding Comparison Levels

Dioxins and Furans

December 2006 — Identifying Soil Cleanup Criteria for Dioxins in Urban Residential Soils: How have 20 years of research and risk assessment experience affected the analysis?[60 Pages - Journal of Toxicology and Environmental Health]

January 2003 — Development of an oral cancer slope factor for Aroclor 1268 [12 Pages - Regulatory Toxicology and Pharmacology]

Information Contact: — NDEP Public Information Officer: (775) 687 - 9395

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