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1 <br /> January 22, 1993 <br /> Job No 0511-41-6090-02 <br /> 2 2 Summary of Groundwater Analytical Results <br /> Chemical analytical results indicate that low concentrations of dissolved petroleum <br /> hydrocarbons exist in the groundwater in the area of MW-27 and MW-30 (see Table B and <br /> Appendix A) Figure 3 Is an interpretative isopleth map of benzene concentrations within <br /> 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 <br /> observed to be dry since at least October 25, 1989 The completion depths of these wells <br /> are all less than 68 feet Depth to water at the site this quarter is greater than 84 feet in <br /> wells MW-27 through MW-30 Therefore, wells MW-1 through MW-23 and RW-24, RW- <br /> 25, and RW-26 were not included by DERS in this monitoring event and will not be included <br />' in future monitoring events until data from wells MW-27 through MW-30 suggest that the <br /> more shallow wells may no longer be dry This course of action has been approved verbally <br /> via telephone communication with Mr Harlan Knoll of the San Joaquin County Health <br /> Services Department <br /> 3 0 CLOSURE <br />' This report presents DERS' understanding of existing conditions at the subject site The <br /> conclusions contained herein are based on the analytical results and professional judgment <br /> which are in accordance with current standards of professional practice, no other warranty <br /> is expressed or Implied DERS assumes no liability for exploratory borings or data reported <br />' by other consultants or contractors <br /> Sincerely, <br /> DU PONT ENVIRONMENTAL REMEDIATION SERVICES <br /> William Bassett James ALehrman, R G Andrew Chan <br /> Staff Geologist Senior Geologist Project Manager <br /> WB/JAL/AC jc <br /> Du Pont Environmental Remediation Services 2 <br /> 051 1 14 Rev 0 Printed an Recycled Paper <br />