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Ms. Turkatte <br /> July 24, 2015 <br /> Page 7 <br /> figures attached. The limited number of soil vapor monitoring probes installed in clean <br /> areas are outside of the primary area of contamination and would have been clean before <br /> and after the soil remediation activities. <br /> 4) Soil vapor confirmation data collected during three events and correlated on a well-by- <br /> well basis to the SVE wells and soil vapor monitoring probes show that residual <br /> concentrations of PCE in soil vapor are very low, below commercial CHHSLs, or non- <br /> detect. <br /> 5) Groundwater monitoring data show that the historical source area at the site has been <br /> remediated to below the PCE MCL, indicating these formerly-impacted soil areas are no <br /> longer a source to groundwater. <br /> 6) All PCE in soil vapor concentrations are an order of magnitude lower that site-specific <br /> risk-based cleanup levels. <br /> 7) All PCE in soil vapor concentrations are well below a site-specific concentration <br /> demonstrated to be protective of groundwater. <br /> We appreciate SJCEHD considering the proposed changes to the abandonment plan as presented <br /> in this Addendum. Please contact me if you have any questions regarding this proposal. <br /> Sincerely, <br /> Caryn Quist, P.E. <br /> Project Engineer <br /> Enclosure <br /> Cc (electronically): Nuel Henderson, SJCEHD <br /> Zoey Merrill, SJC County Counsel <br /> Phil Johnson, Lincoln Properties Ltd. <br /> Ken Baker&Phil Cicolello,AIG <br /> Joe Salazar, Lewis Brisbois Bisgaard& Smith, LLP <br /> Joe Niland, Lincoln Center Environmental Remediation Trust <br /> addendumtoA ndonmentwp.doc <br /> engineers I scientists I innovators <br />