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Remediation Action Report <br /> Mountain House High School <br /> April 17, 2007 <br /> Page 2 <br /> detected in any of the samples. Benzene was the only carcinogen found and the highest <br /> concentrations of benzene were generally found at the greatest depths. <br /> The following DTSC staff reviewed and provided comments RAR. Please contact the <br /> Project Manager if you have any questions on the comments. Original comments from <br /> the Toxicologist are available for review in DTSC project files. <br /> Kamili Siglowide Gabriele Windgasse, Ph.D <br /> Project Manager Staff Toxicologist <br /> Schools Unit — Sacramento Office Human and Ecological Risk Division <br /> Department of Toxic Substances Department of Toxic Substances <br /> Control Control <br /> 8800 Cal Center Drive 8810 Cal Center Drive <br /> Sacramento California 95826 Sacramento, California 95826 <br /> ksiglowi @ dtsc.ca.gov gwindgass @ dtsc.ca.gov <br /> (916) 255-6527 (916)255-6628 <br /> General Comment <br /> 1. DTSC comments relate only to the investigation in Areas 3, 4, 5. <br /> 2. The data in the 2005 Clayton Report indicates that contaminated groundwater was <br /> found on the school site at significant concentrations: max TPHc: 55,000 Ng/L; max. <br /> TPHd: 29,000Ng/L; benzene: 18,ug/L; toluene: 2.7 ,ug/L; ethylbenzene: 1 .2,ug/L and <br /> xylenes: 18 ,ug/L. Although step-out samples indicate that concentrations reduce with <br /> distance away from the pipeline, DTSC request to review all of the groundwater data <br /> collected near the proposed MHHS for verification. <br /> 3. The DTSC School Program requires that all proposed school sites be suitable for <br /> unrestricted residential land use. For potential school sites, the human health <br /> risk/hazard screening evaluations uses the highest concentrations of each <br /> contaminant detected onsite to estimate the site's potential threat. The risk/hazard <br /> estimates are calculated for exposure pathways most frequently encountered in a <br /> school setting, including: <br /> 1) inhalation of fugitive dust, <br /> 2) ingestion of groundwater or surface water, and <br /> 3) dermal absorption from soil and/or groundwater or surface water. <br />