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r ' <br /> Closure Documentation—7500t Eleventh Street, Tracy, CA, Page 19 <br /> Contaminants in LNAPL 0 grams <br /> Contaminants Adsorbed onto Soil 2,105,275 grams <br /> Contaminants Dissolved in Groundwater 139 grams <br /> Total Estimated Mass of Contaminants in Subsurface 2,105,414 grams <br /> in July 2011 <br /> From the above estimates, the following mass balance calculation of contaminants in the <br /> subsurface that were treated versus that remaining can be made for the 7500 W 11th <br /> Street site. <br /> CONTAMINANT MASS BALANCE <br /> Contaminant Initial Mass Mass Remediation <br /> Location Mass Remediated Present Mechanism <br /> 1998 July 2012 <br /> grams grams grams <br /> Extraction and <br /> In LNAPL 9,239,599 9,239,599 0 Bioremediation <br /> In Soil 2,631,579 526,304 2,105,275 Excavation <br /> Dissolved 525 386 139 Bioremediation <br /> in Groundwater <br /> TOTAL MASS 11,871,703 9,766,289 2,105,414 <br /> 2.14 Assumptions, Parameters, Calculations, and Model Used in Risk Assessments, <br /> and Fate and Transport Modeling <br /> The assumptions, parameters, calculations, and models used in risk assessment for the <br /> 7500 W. 11th Street sire were presented in: <br /> The San Joaquin Company Inc. (2009), Work Plan for Evaluation of MTBE <br /> Migration and Soil Gas Survey, 7500 West Eleventh Street, Tracy, <br /> California. April 2009. <br /> DEC <br />