Technical Guide (MS Word) - U.S. Environmental Protection Agency
Several exposure and risk management and cleanup decisions in support of . Compare site mean concentrations with reference area mean concentrations, and . Represented by the central value when n is odd or by the average of the two .
Calculating Upper Confidence Limits for Exposure Point ...
Dec 10, 2002 . An exposure unit is the area throughout which a receptor moves . EPA recommends using the average concentration to represent "a . calculating the 95 percent upper confidence limit of the mean concentration, which can .
Estimating the Soil Lead Concentration Term for the Integrated ...
(EPA) staff on making risk management decisions for contaminated sites. . recommends the use of the arithmetic mean or average concentration for the PbS . . The area-weighted approach assumes that exposure is proportional to the size of .
USEPA: OSWER: Risk Assessment: Transmittal of Interim Bulletin ...
Jun 22, 1992 . an arithmetic mean concentration when modelling long-term exposure to site . bulletins will focus on topics such as, defining an exposure area and dealing with . An estimate of average concentration is used because: SN,rJ .
Superfund - U.S. Environmental Protection Agency
Jump to main content or area navigation. . A cleanup goal can be derived using exposure assumptions based on site-specific . and corresponds to the average time spent at work by both full- and part-time . Under both current and future exposure scenarios, an arithmetic mean concentration should be estimated from .
Supplemental Guidance to RAGS: Calculating the Concentration Term
area, then the spatially-averaged soil concentration . (U.S. EPA, Guidance on Risk Characterization for . exposure area provide poor estimates of the mean .
HH Exposure Assessment | Region 8 | US EPA
An exposure point (also called an exposure area or exposure . true arithmetic mean concentration of a chemical in a medium . intake at the exposure point is " IR" and that, on average, .
Air Quality Criteria for Ozone and Related Photochemical Oxidants ...
maximum monthly mean concentrations in the summer. The White . areas generally are lower than those in urban areas, but that average concentrations in rural . NEM is an EPA exposure model developed in the 1980s (Biller et al., 1981).
Ecological Risk Assessment: Exposure Assessment | Region 8 | US ...
An exposure point (also called an exposure area or . is the average (arithmetic mean) concentration .
SUPPLEMENTAL GUIDANCE FOR DEVELOPING SOIL SCREENING
Dec 24, 2002 . Janine Dinan of EPA, the EPA Work Assignment Manager for . Exhibit 5-2: Mean Number of Days with 0.01 Inch or More of Annual Precipitation . contaminant concentrations in surface soils in exposure areas of concern. . contamination, the average contaminant concentration in each source area, and .
Tetrachloroethylene (Perchloroethylene) (CASRN 127-18-4) | IRIS ...
Feb 10, 2012 . HERO is a database of scientific literature used by U.S. EPA in the process of . * Derived by route-to-route extrapolation from inhalation exposure using . Therefore, area under the curve (AUC) of blood tetrachloroethylene . mg/m3] ( time-weighted average mean concentration) was identified, based on .
Guidance, Addressing Lead at Superfund Sites | Superfund | US EPA
Estimating the Soil Lead Concentration . Integrated Exposure Uptake Biokinetic . mean or average concentration for the PbS. . which includes common play areas .
CHAPTER 5 PROBABILISTIC RISK ASSESSMENT AND ...
Dec 31, 2001 . site, determining whether a particular area meets or will . True Mean Concentration - The actual average concentration in an exposure unit. . on standard default exposure assumptions (e.g., U.S. EPA, 1991b) and toxicity .
As I drove home I thought of one thing the classroom needed-a changing corner for trying on garments as you sew
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