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April 19, 1993 <br /> Job No 0511-42-5010-04 <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-30 (see Table B and Appendix ' <br /> A) Figure 3 is an interpretative isopleth map of benzene concentrations within the <br /> groundwater for the site <br /> 1 <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 a 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 /> r.P4 C <br /> William E Bassett, Jr James A Lehrman, R G Andrew Chan ' <br /> Staff Geologist Senior Geologist Project Manager <br /> WB/JAL/AC jc <br /> Du Pon, Environmental Remediation Services 2 <br /> 0511 17 Rev 0 Printed on Recycled Paper ' <br />