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X <br /> Closure Documentation—7500 Elevenlh Street, Tracy, C4. Page 8 <br /> Figure 11: Isocons of TPHd in Soil <br /> Figure 12: Isocons of TPHg in Soil <br /> Figure 13: Isocons of Benzene in Soil <br /> Figure 14: Isocons of Toluene in Soil <br /> Figure 15: Isocons of Ethyl Benzene in Soil <br /> Figure 16: Isocons of Total Xylenes TPHg in Soil <br /> Except to the extent that they indicate a maximum for the lateral limits of the <br /> distributions of the various contaminants released from the in the subsurface beneath the <br /> 7500 W. 11th Street site, for the cited reasons, that are based on good engineering <br /> practice and an understanding of contaminant transport in alluvia fans, DEC has made no <br /> attempt to interpret the detailed complexity of any of the isocons of contaminants in soil <br /> or in groundwater. <br /> 2.9 Zone of Influence Calculated and Assumptions Used for Subsurface <br /> Remediation Systems and the Zone of Capture Attained for Soil and <br /> Groundwater Remediation Systems <br /> Due to SJCEHD's failure to authorize the corrective action technology recommended by <br /> the professional engineer in responsible charge of the work (see Section 2.11 below), <br /> zone of influence and zone of capture calculations were not relevant to the methods <br /> actually used to remediate the 7500 W. 11th Street site. However, extensive analyses and <br /> analytical element modeling of the zone of influence and the zone of capture that could <br /> have been attained by the recommended remediation technology was included in the <br /> following reports. <br /> The San Joaquin Company Inc. (2007), Corrective Action Plan for Former <br /> Fueling Station, 7500 West Eleventh Street, Tracy, California. July 2007. <br /> The San Joaquin Company'Inc. (2007), Corrective Action Plan Addendum <br /> for Former Fueling Station, 7500 West Eleventh Street, Tracy, California. <br /> October 2007 <br /> The San Joaquin Company Inc. (2003) Work Plan for Refined Plume <br /> Definition and Management of Floating Product at Former Fueling Station, <br /> 7500 West Eleventh Street, Tracy, California. December 2003. <br /> 2.10 Reports/Information: Unauthorized Release Form, QMR(Dates), Well and <br /> Boring Logs, PAR, FRP. Other(Report Name) <br /> l <br />` DEC <br />