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Page 2 <br /> October 5, 1992 ' <br /> Job No 0511-41-6090-02 <br /> 2.2 Summary of Groundwater Analytical Results <br /> Chemical analytical results indicate that dissolved petroleum hydrocarbon constituents 'exist in the <br /> groundwater in the area of MW-30 and MW-29 (see Table B and Appendix A) Figure 3 is an <br /> w interpretative isopleth map of benzene concentrations within the groundwater for_the_site <br /> 2.3 Future Sampling Procedures ' <br /> Monitoring wells MW-1 through MW-23 and wells RW-24, RW-25, and RW-26 have been observed ' <br /> to be dry since at least October 25, 1989 The depths of completion of these wells are all less than 68 <br /> feet Depth to water at the site has been observed to be greater than 82 feet in wells MW-27 through <br /> MW-30 Therefore,wells MW-1 through MW-23 and RW-24, RW-25, and RW-26 will not be included ' <br /> by DERS in future monitoring episodes until the time that data from wells MW-2.7 through MW-30 <br /> suggests that these wells may no longer be dry This course of action has been approved verbally via <br /> telephone communication will Mr Harlan Knoll of the San Joaqum County Health Services <br /> 3.0 CLOSURE <br /> This report presents DERS' understanding of existing conditions at the subject site The conclusions <br /> cbntamed herein are based on the analytical results and professional judgment which are in accordance <br /> with current standards of professional practice, no other warranty is expressed or implied DERS <br /> assumes no liability for exploratory borings or data reported by other consultants or contractors <br /> Sincerely, <br /> DU PONT ENVIRONMENTAL REMEDIATION SERVICES <br /> 14 <br /> William Bassett 4JTames A Lehrman Andrew Chan <br /> Staff Geologist Registered Geologist, 5032 Project Manager <br /> WB/JAL/AC jc <br /> Du Pont Environmental Remediation Services ` <br /> 051110 Rev 0 Printed onRecycledPaper <br />