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Wilbur Ellis <br /> 212 Industrial Blvd., Stockton. Page 2 <br /> Future soil boring and monitoring well installation reports should contain all the soil sample <br /> data collected for the site on one table. The dates and the depth the soil sample was <br /> collected from should be on the table next to the sample identification. At least one cross <br /> section of the subsurface lithology is to be included in the next report of soil boring and/or <br /> monitoring well installations. <br /> The depth to the groundwater is currently at the highest level ever recorded in San Joaquin <br /> County. The depth to water in the recently installed monitoring wells was at the top of the <br /> screened interval on October 2, 1998. If quarterly measurements of the depth to <br /> groundwater show the groundwater level over the screened interval ("drowned screens") for <br /> a full annual period, additional monitoring wells will have to be installed. Newly installed <br /> monitoring wells are to be constructed so that the screened interval is placed above and <br /> below the groundwater interface depth at the time of the well's construction. These new <br /> wells should be adjacent to the existing wells and are to have the screened interval over-lap <br /> the existing monitoring well's top of screened interval by two feet. Please have your <br /> consultant prepare for this contingency by submitting a workplan for the additional <br /> monitoring wells by the end of the annual period of consistently drowned screens. <br /> Until all quadrants of the site have been investigated and the groundwater plume has been <br /> delineated, PHS-EHD cannot comment on your consultant's conclusion that some other <br /> source exists for the Benzene contamination. Possible onsite sources are to be completely <br /> investigated and the possibility of onsite spills from temporary storage of railroad equipment <br /> is to be verified in the search. <br /> Please direct any questions you may have and all requests for field inspections to Michael <br /> Infurna at (209) 468-3454. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> 9/�C_ 15;-- <br /> Jr., Senior REHS Mar a tr'd La orio S <br /> Michael J. Infurna J , S g g , R <br /> LOP / Site Mitigation Unit IV Supervisor <br /> MI/ <br /> c: Krazan &Associates Inc - Bruce Meyers, 215 West Dakota Ave, Clovis, 93612. <br /> c: CVRWQCB — Mark List, Sacramento. <br /> c: SWRCB-CUF — Sandy Gill, Sacramento. <br />