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2k <br /> 1 <br /> ' F <br /> 6 <br /> 853 E. Yosemite, Manteca <br /> `Page 2 <br /> of MW 1. The soil and groundwater samples must <br /> laterally or vertically west/northwest <br /> be analyzed for the contaminants listed above. In addition, the.soil:sample results from <br /> the site should be compared to the San Francisco Bay Regional Water Quality Control f <br /> Board (SFBRWQCB) Environmental Screening Levels (ESL's). If any soil sample result <br /> exceeds the SFBRWQCB ESL's, then additional data or justification must be provided to <br /> ensure all human health risks have been addressed. For example, the soil sample <br /> collected at 20 feet bsg from MW2 had 13.5 mg/kg of MTBE 'and the SFBRWQCB Tier 1 <br /> Environmental Screening Levels Surfer shows a limit of 5.6 mg/kg for vapor emissions to <br /> indoor air, so further data or justification would be necessaryto address the concern of F <br /> vapor emission to indoor air currently or in the future. <br /> f <br /> A work plan (WP) that addresses the concerns stated above; an EHD well permit <br /> application, and $89 permit fee should be submitted to EHD by 1 August 2007. The <br /> j work should be completed within 60 days of WP approval by�EHD and an i <br /> addendum/report of findings should be submitted within 60 days of-the completion of the <br /> work. <br /> If you have any further questions regarding this matter, contact Harlin Knoll at (209)468- <br /> 3442. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Harlin Knoll, Senior REHS Margaret agorio, REH f <br /> LOP/Site Mitigation Unit IV Program;Coordinator Unit IV <br /> i <br /> I Cc: SWRCB-Cleanup Fund <br /> CVRWQCB-James Barton <br /> ' Secor <br /> l <br /> E Y <br /> • i <br /> i <br /> E i <br /> I <br /> { i <br /> E <br /> i <br />