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0 <br /> Sharpe Army Depot <br /> Page 3 <br /> August 21, 1989 <br /> The Department would like to clarify a few issues regardi g the <br /> Department's Applied Action Levels (AALs) and Human Health based <br /> Risk concentrations. The Human Health-based Risk concentrations <br /> were derived from the Integrated Risk Information System (IRIS) , <br /> US EPA, July 1989. The AAL and the Health-based Risk <br /> concentrations are the de minimis (10-6) risk concentratio s and <br /> are essentially the same. The major difference is tha the <br /> toxicology data for the AAL compounds has been rev ewed, <br /> extensively, by the Department's Toxicology staff. The rpose <br /> of that review is to ensure that the IRIS data is valid, or, as <br /> in the case of benzene, special factors, such as method detection <br /> limits, have been considered. The following is a breakdown of <br /> the AALs and the Health-based Risk concentrations, in ug/m3 <br /> AAL Health-based Risk <br /> Benzene 3 . 2 0. 066 <br /> Carbon tetrachloride 0. 027 <br /> Chlorobenzene b <br /> Chloroform 0. 6 <br /> 1, 1-dichloroethene 0 . 003 <br /> 1, 1-dichloroethane b <br /> trans-1,2-dichloroethene 70 <br /> Ethylbenzene 140 <br /> Methylene chloride 0 . 25 <br /> 1, 1, 1-trichloroethane 310 <br /> 1, 1,2-trichloroethane 0 . 06 <br /> Tetrachloroethene 0 . 2 <br /> Toluene 200 <br /> Trichloroethene 7 <br /> a - For each chemical, the concentration listed is the <br /> ambient air concentration which is associated wi h an <br /> individual excess lifetime cancer risk of 10-6 <br /> (carcinogens) , or the concentration believed to adeqaately <br /> protect human health (non-carcinogens) . <br /> b - Non-occupational standards are not readily availab e. <br /> The AAL and Human Health-based Risk concentrations are not <br /> promulgated regulatory standards and, therefore, are not <br /> enforceable by law. They are, however, guidelines that should be <br /> used in evaluating the risk to the public health and welfare and <br /> the environment. Additionally, the Health-based Risk <br /> concentrations were targeted to off-site residential exposures. <br /> 6) Schedule and Project Management - A schedule for the <br /> implementation and completion of the Sample Plan should be <br /> included in the revised document. Additionally, a Section should <br /> be included to delineate the responsibilities of Sharpe Army <br /> Depot, USATHAMA, and Hunter/ESE. This Project Management s ction <br /> should identify the key persons and their responsibilities. <br />