Laserfiche WebLink
CHEVRON EMC 9258420213 03/29 100 14:32 NO.689 06/06 <br /> I Wendy Wyels <br /> i • <br /> August 13, 1997 <br /> Page 5 <br /> 5. Supplemental Risk Evaluation Document <br /> At the suggestion of DTSC, health-based concentrations of soil were developed to document that oc ma oilyterial <br /> which is clearly not <br /> present a health threat if common precautions are taken, Seep <br /> Outrlonly Seep pis lotce likely <br /> to <br /> on this brief document is that the concentrations developed are that no probabilistic can not truly "risk based" in <br /> caner risk was assessed. Technically,"health-based". Be aware that the criteria they should b termed <br /> used to estimate excess cancer risk assume <br /> routine contact over a significant fraction of a lifetime, which are not usually applicable <br /> to seeps of the kind seen at Alden Park. However, this material contains a large amount <br /> of cPAHs, so that, in the disposition of this site, assurance should be provided that the <br /> Oily material does not serve as a reservoir for contamination of clean soils and that <br /> prudent practices are taken to prevent routine human contact with surface <br /> Occurs, no human health impacts are anticipated. steps. if this <br /> CONCLUSION <br /> No further modifications to the documents under review are reco the memorandum <br /> record for this site, the electronic files mentioned above along With disposition of <br /> memorandum should accompany the risk assessment. <br /> Please call with questions of comments. <br /> 1 <br /> i <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> I <br /> 1 <br />