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1400 Waterloo <br /> Page 2 <br /> �M <br /> Considerable discussion has ensued between PHSIEHD and IT regarding the estimation of <br /> residual soil contamination mass. Soil contamination was evidenced continuously in the soil <br /> boring, B1, drilled directly through the former tank location.;! Soil contamination was also <br /> evidenced outside of the former tank location in soil borings, SB'I,i` and MW4. Soil <br />' contamination was also evidenced following the over-excavation attempt. Please note that all <br /> evidenced soil contamination must be considered when developing an estimate of residual <br /> soil contamination mass. ;',' I <br /> l <br /> Should the results of environmental fate analysis indicate th}at groundwater would not be <br /> significantly contaminated; PHSIEHD would evaluate a corrective!iaction pian which proposes <br /> and demonstrates cost effective alternatives which may include the implementation of a <br /> passive bioremediation system to remediate residual soil and groundwater contamination. , <br /> If you have any questions, please contact Mary Meays at (209) 468-0337. <br /> k <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> / vL <br /> Mary Meays, Senior REHS Diane M jHinson, REHS <br /> Site Mitigation Unit Supervisor <br /> MM11400WATE <br /> cc: Elizabeth Thayer, CVRWQCB C <br /> cc: Linus Farias, IT Corporation <br /> 'r <br /> ii <br /> C <br /> ;l <br /> I <br /> I <br />