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;taer ai California • • Department of lisalth Services <br /> Memorandum <br /> Barbara Marcotte Date January 5, 1989 <br /> Property Evaluation Unit <br /> Sub'ect: Health Risk <br /> 1Assessment, Valley <br /> Via Jeffrey Wong, Ph.D.,Y^ Haven Property <br /> Lead Staff Toxicologist <br /> Michael Schum -S <br /> From Staff Toxicologist <br /> The following document was received December 19, 1988 by the <br /> Toxicology and Risk Assessment group (TOX) for review of the <br /> health risk assessment required for a border zone determintion <br /> requested by Verner Construction for the Valley Haven pro erty <br /> located adjacent to Sharpe Army Depot (SHAD) , an EPA desig ated <br /> Superfund site: <br /> 1) Health Risk Assessment, Valley Haven Property, East Lathrop <br /> Road, Lathrop, California. Kleinfelder, Inc. , <br /> December 16, 1988 . <br /> TOX review of this document does not address the adequacy, <br /> accuracy or appropriateness of the soil gas sampling, and will <br /> assume that the data collected and presented have been reviewed <br /> by the Property Evaluation Unit (PEU) and/or the Exposure <br /> Assessment Unit. The methodology used in this risk assessment has <br /> been discussed and reviewed by TOX previously in a memo dated <br /> 11/21/99 to PEU. <br /> GENERAL <br /> Kleinfelder and subcontractor Environmental Risk Sciences (ERS) <br /> have done a commendable job of following the recommendations TOX <br /> has made previously. The format and methodology follow DHS and <br /> EPA recommended guidelines for health risk assessments, and the <br /> report is generally complete and well written. The conclusion <br /> that no significant health risks will result to the general <br /> population expected to reside at Valley Haven appears to be <br /> supported by the environmental data collected, environmental <br /> dispersion modeling performed, and comparison of predicted <br /> ambient air concentrations to health protective criteria values <br /> for toxic chemicals. <br /> It is important to emphasize that this risk assessment does not <br /> address any potential risk which may result from contaminated <br /> groundwater. The building contractor requesting the border zone <br /> determination has stated that no groundwater will be used for <br /> drinking, irrigation or recreation. As long as these restrictions <br /> are met, the health risk assessment reviewed here presents a fair <br /> evaluation of the risks from inhalation of volatile or anic <br /> chemicals identified at the site. Similarly, the ingestion <br />