Upload
mbalshi
View
245
Download
3
Tags:
Embed Size (px)
DESCRIPTION
Brief presentation on technical guidance for characterizing asbestos related risk in soils that my company authored. Please contact me with questions.
Citation preview
1Neptune and Company, Inc.
Technical Guidance for Asbestos Risk in Soils
Neptune and Company, Inc.
Denver, COwww.neptuneandco.com
2Neptune and Company, Inc.
• Many guidance documents available cover specific topics: – cancer potency factors related to dust
inhalation, particulate modeling, dispersion processes for asbestos in soils, etc.
• Guidance that combines all of these topics does not exist– Results in the lack of a straightforward
path for calculation of asbestos risk in soils– External review of risk calculations is
therefore difficult and time consuming
Background
3Neptune and Company, Inc.
• No guidance available on statistical sampling design assuming a baseline risk threshold for asbestos– E.g., If assuming a 1E-06 risk, how many
samples should a field team collect?– Why do sites fail if zero fibers are present?
• What method of sampling should be used?
• What about quality assurance/quality control?– Data Quality Objectives (DQO) process
Background (continued)
4Neptune and Company, Inc.
• Guidance that integrates all existing guidance together to aid risk assessors, contractors, consultants, and managers:– Neptune (2011)
– Excel Workbook (example slides at end) • Optimal sample size calculation• Receptor-specific particulate emission models• Pooled analytical sensitivity• Receptor-specific risk calculation
Solution
5Neptune and Company, Inc.
• Berman and Crump (2003)– Treats amphibole and chrysotile fibers
separately– Transmission Electron Microscopy (TEM)– Cancer risk from fibers:
• > 10 um in length• < 0.4 um in width
• U.S. EPA (2002)– Particulate Emission Factor (PEF) models
Guidance Follows…
6Neptune and Company, Inc.
• Issues related to asbestos in soils• Activity Based Sampling vs. Berman and
Crump (2003) for characterizing risk• Site assessment, analysis methods,
sampling design, and quality control• Sample size calculations• Data validation steps for asbestos data• Exposure concentration estimation• Characterizing asbestos-related risk
Guidance covers…
7Neptune and Company, Inc.
Risk Calculation Workbook
Disclaimer: Screenshots of asbestos guidance spreadsheet are given as examples only.Disclaimer: Screenshots of asbestos guidance spreadsheet are given as examples only.
8Neptune and Company, Inc.
Particulate Emission Factors
Disclaimer: Screenshots of asbestos guidance spreadsheet are given as examples only.Disclaimer: Screenshots of asbestos guidance spreadsheet are given as examples only.
9Neptune and Company, Inc.
Pooled Analytical Sensitivity
Disclaimer: Screenshots of asbestos guidance spreadsheet are given as examples only.Disclaimer: Screenshots of asbestos guidance spreadsheet are given as examples only.
10Neptune and Company, Inc.
Sample Size Calculation
Disclaimer: Screenshots of asbestos guidance spreadsheet are given as examples only.Disclaimer: Screenshots of asbestos guidance spreadsheet are given as examples only.
11Neptune and Company, Inc.
ReferencesBerman DW, Crump KS, (2003) Final draft: Technical support document for a protocol to assess asbestos-related risk. Prepared for Mark Follensbee, Syracuse Research Corporation, Syracuse, NY, and the Office of Solid Waste and Emergency Response, U.S. Environmental Protection Agency, Washington, DC. USEPA #9345.4-06. Limited revision draft.
Neptune and Company, Inc. (Neptune), 2011. Technical Guidance for the Calculation of Asbestos Related Risk in Soils for the Basic Management Incorporated (BMI) Complex and Common Areas. Prepared for Nevada Division of Environmental Protection. February 2011.
U.S. Environmental Protection Agency (USEPA), (2002) Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites, Office of Solid Waste
and Emergency Response #9355.4-24, U.S. Environmental Protection Agency, Washington, D.C.
12Neptune and Company, Inc.
Questions?
www.neptuneandco.com
Contact our Denver office for more information:Contact our Denver office for more information:
Dr. Michael Balshi ([email protected]) Dr. Michael Balshi ([email protected])
Dr. Paul Black ([email protected]) Dr. Paul Black ([email protected])