Review of a Screening Level Risk Assessment for the Navy Air Facility at Atsugi, Japan (1998) / Chapter Skim
Currently Skimming:
Detailed Report
Detailed Report
Pages 3-18
The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.
From page 3... ...
dispersion of pollutants from solid waste piles and liquid waste sources should be evaluated. Adequate QA-QC measures should be taken during air sampling and analysis to provide accurate measurements of pollutant concentrations.
|
From page 4... ...
That observation raises questions about the general background concentrations of particulates at NAF Atsugi. The ~ 995 NEHC report described the incinerator operator's practice of pouring of liquid waste over solid waste piles to be incinerated.
|
From page 5... ...
These modifications of normal operating, procedures were unfortunate because they likely invalidate the measurement data and Night make them unusable for quantifying the incinerator complex as a source of the measured pollutants. For example, the meteorological data show no correlation between wind direction and level of particulate matter (see later discussion)
|
From page 6... ...
. Carcinogenic risks for the individual carcinogens were calculated by multiplying the average daily intake over a lifetime by the carcinogenic slope factor and summing the individual risks to yield the total carcinogenic risk.
|
From page 7... ...
a reduction of its slope factor will increase the overall carcinogenic risk. Noncarcinogenic Risk Assessment To assess the noncarcinogenic risk frown exposure to pollutants identified in the air samples, NEHC searched two EPA databases (IRIS and HEAST)
|
From page 8... ...
Assessment of Chemicals without Toxicity Values Neither carcinogenic nor noncarcinogenic toxicity values were available for nine pollutants in the two EPA databases searched by NEHC? so qualitative assessments of toxicity were conducted by using EPA Region TIT toxicity values to calculate their carcinogenic and noncarcinogenic risks.
|
From page 9... ...
Impact of Wind Direction on Risk NEHC evaluated the meteorological data collected on each day that air sampling was performed to determine if the measured ambient pollutant concentrations correlated with wind direction. The hourly wine} speed and direction results were evaluated by using EPA's Wind Rose 9
|
From page 10... ...
3637) states "insufficient meteorological data resulted in lack of correlation between wind direction toward sampling site and concentration of chemicals." That statement implies that poor correlation resulted from lack of data, when, in fact, the correlation analysis is not valid because of the reasons described above.
|
From page 11... ...
2. Scientific Validity of the NEHC Conclusions The 1998 NEHC report concluded that the estimated carcinogenic and noncarcinogenic risks to naval personnel and their families at NAF Atsugi were similar to risk levels calculated in 1995 (NEHC 1995~.
|
From page 12... ...
COT recommends that the following uncertainties also be considered: The validity of the hazard indices used to evaluate noncarcinogenic risks is questionable. The conversion of RfL and annual average NAAQS values into RfDs is not appropriate for calculating hazard indices for inhaled pollutants.
|
From page 13... ...
It is inappropriate to convert RfUs and NAAQS values into RfDs for inhaled pollutants. The following uncertainties should also be considered in the NECK risk assessment: The validity of the hazard indices used by NEHC to evaluate noncarcinogenic risks is questionable.
|
From page 14... ...
Continue to collect medical data from Branch Clinic Atsugi and other comparahie medical treatment facilities concerning respiratory health effects that may he attrih? 'lec to the poor air quality, to determine rates of illness incidence.
|
From page 15... ...
2. Nearby sources of air pollutants, other than the incinerator complex' should be characterized, and their contributions to total risk evaluated.
|
From page 16... ...
6. Editorial Comments on 1998 NEHC Report Executive Summary paragraph I: Noncarcinogenic risk levels appear to have been confuses!
|
From page 17... ...
I Also, it is stated that EPA has used I chance in ~ 0,000 as a benchmark for carcinogenic risk in industrial scenarios.
|
From page 18... ...
~ p. 37: It is stated that air samples were collected on 23 different days and that location ~ was sampled on 27 days.
|
Key Terms
This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More
information on Chapter Skim is available.