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853 E. Yosemite, Manteca <br /> Page 2 <br /> laterally or vertically west/northwest of MW 1. The soil and groundwater samples must <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 <br /> Board (SFBRWQCB) Environmental Screening Levels (ESL's). If any soil sample result <br /> F 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 1.3.5 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 necessary to address the concern of <br /> I vapor emission to indoor air currently or in the future. <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 /> work should be completed within 60 days of WP-approval by EHD and an <br /> addendum/report of findings should be submitted within 60 days of the.completion of the <br /> { work. <br /> i <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 /> kV ` _ <br /> Harlin Knoll, Senior REHS Margaret agorio, REH <br /> LOP/Site Mitigation Unit IV Program Coordinator Unit IV <br /> { <br /> j Cc: SWRCB-Cleanup Fund <br /> CVRWQCB-James Barton <br /> i Secor <br /> i <br /> i <br /> i <br />