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Work Plan to Delineate Soil <br /> Contamination in the Ag Chem Area <br /> ARCADIS Former Occidental Chemical Corporation <br /> Lathrop, California <br /> Consistent with DTSC guidance for comparison to screening levels <br /> (DTSC,2011 b;Cook,2007)and precedent,cleanup goals will be based <br /> on attaining a representative exposure point concentration across an exposure area. <br /> Soil sample locations with risk drivers at exposure point concentrations that contribute <br /> significantly to exceeding target risk levels will be excavated or otherwise remediated. <br /> A statistical test will be done for the residual concentrations to demonstrate that the <br /> 95%UCL values for residual soil yields estimates of cancer risk and non-cancer <br /> hazards at or below the target risk levels.Acceptable residual risk estimates will <br /> support the assertion that the key"hotspots"of contamination in soil have been <br /> addressed within the Ag Chem Area. <br /> 5. References <br /> AM EC,2009.Addendum to the Human Health Risk Assessment Report Dated June <br /> 2006,J.R. Simplot Company,Ag Chem Area, Lathrop,California.January 7. <br /> ARCADIS,2011 a. Work Plan for Supplemental Investigation in the Ag Chem Area. <br /> Former Occidental Chemical Corporation Facility, Lathrop,California. November 9. <br /> ARCADIS,2011 b. Site-specific health and safety plan, Former Occidental Chemical <br /> Corporation Facility, Lathrop, California. February 22. <br /> ARCADIS,2012. Supplemental Investigation in the Ag Chem Area Summary Report <br /> and Well Installation Work Plan. Pending.April. <br /> Cook,2007. Soil Excavation Cleanup Plans. DTSC Statewide Cleanup Operations. <br /> Available online at www.calcupa.net/civica/fiilebank/blobdload.asp?BloblD=2726. <br /> DHS, 1981. Interim Status Document, No.CA008184508, Occidental Chemical <br /> Company.July 17. <br /> DTSC,2011. Voluntary Cleanup Agreement in the matter of Former AgChem Area of <br /> Occidental Chemical Corporation, J.R. Simplot company Site. Docket No. HAS-BCA <br /> 10/11-097. <br /> DTSC,2001b. Human Health Risk Assessment(HHRA) Note Number: 3. DTSC <br /> Recommended Methodology for Use of U.S. EPA Regional Screening Levels(RSLs)in <br /> the Human Health Risk Assessment Process at Hazardous Waste Sites and Permitted <br /> Facilities. California Department of Toxic Substances Control(DTSC)Office of Human <br /> and Ecological Risk(HERO). May 20. <br /> EPA, 1996.Region IX Preliminary Remediation Goals(PRGs).August 1. <br /> lathmpwmk plan suppbmentel invest ag chem 05012012.Eax 9 <br />