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IE - <br /> ATC Associates Inc. <br /> `- M%TC" 209-579-2221 1117 Lone Palm Avenue,Suite 201 <br /> Modesto,California 95351 <br /> Fax:209-579-2225 <br /> C-OATE,-S INCA <br /> • Some of the soil analytical data collected over the course of subsurface.investigations exceeds <br /> current ESL values. The SVE effort appears to have been effective in reducing vadose zone <br /> impacted soil;-, <br /> • The dissolved contaminants at the site are'localized and exhibit a decreasing trend over the as 12 <br /> years. More recent data collected during the last three years exhibit either a decreasing or stable <br /> statistical trend as observed from the Mann-Kendall plume stability statistical analysis (except for <br /> MTBE data associated with MW1 and MW2 as indicated in Section 4.6). <br /> g ..: <br /> • The data collected to date indicate the project site does not appear to represent a significant risk to <br /> 1. d on current RW <br /> human health and the environment base CB criteria.Q <br /> Risks associated with soil vapor exposure have nevenbeen evaluated at the site. However, active <br /> � remediation of vadose zone soil would be expected to reduce the risk of soil vapor intrusion. <br /> 9.0 RECOMMENDATIONS <br /> Based on the available data collected during previous subsurface investigation and quarterly groundwater <br /> - monitoring activities, ATC recommends removal of the soil vapor extraction system and destruction of <br /> the monitoring and vapor wells. <br /> L <br /> L <br /> t: <br /> L <br /> L <br /> S:Environmental1625771Reports12010 closure summary.doc ) <br /> L <br /> i <br />