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1081 Mendocino <br /> Page 2 of 2 <br /> If further site evaluation reveals MTBE to be a significant problem it may be necessary <br /> to construct additional appropriately screened monitoring wells and/or monitoring well <br /> clusters in transect or perpendicular to the MTBE plume. <br /> The report shows the locations of nearby UOP and municipal wells. Any boring logs that . <br /> may be available for these wells must be provided to PHS/EHD. Also, conduct a <br /> receptor survey and submit boring logs for any other municipal, agricultural, industrial, <br /> domestic, or other groundwater wells within a 2,000-foot radius of the site. Information <br /> regarding the use and pumping rates for all wells within the 2,000 foot radius must be <br /> provided to PHS/EHD. Contact the Department of Water Resources, PHS/EHD records <br /> and nearby industries for well information. <br /> In addition to the literature search described above, a ground-truth physical survey for <br /> wells within a 2,000-foot radius of the site must also be conducted. The location of wells <br /> identified in the physical search must be provided to PHS/EHD, as well as any known <br /> well construction details. All sources of information utilized in the physical well survey <br /> must also be provided to PHS/EHD. <br /> A physical survey must also be conducted to identify any potential conduits that would <br /> allow vertical or lateral migration of contaminants in groundwater. This survey should <br /> also cover a radius of 2,000 feet from the site, and can be combined with the physical <br /> survey for wells. <br /> A work plan to determine the lateral and vertical extent of groundwater and soil <br /> contamination at this site must be submitted to PHS/EHD by December 1, 2000. Contact <br /> Carol Oz, Senior REHS at (209) 468-3440 if you have questions regarding this letter. <br /> Donna Heran, Director <br /> Environmental Health Division <br /> Carol Oz, Senior REHS Dot Lofstrom,RG <br /> Site Mitigation Unit IV Engineering Geologist Unit IV <br /> UNSupervisor <br /> cc: Marty Hartzell, RWQCB <br /> Crystal Stech-ESA <br />