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Page 2 <br /> March 6, 1992 <br /> Job No 400511-Q19 f <br /> property (see Table B and Appendix A) Figure 3 is an interpretative isopleth map of benzene <br /> concentrations within the groundwater for the site ' <br /> In addition to the wells illustrated in Figure 3 and Table B, a groundwater well owned by Marley <br /> Cooling Tower, Inc (designated as MW-310) was sampled by DERS and analyzed for petroleum <br /> hydrocarbon constituents Well MW-310 is located on the north side of East Washington Street <br /> approximately 410 feet west of the subject property Petroleum hydrocarbons were not detected in the <br /> groundwater samples from MW-310 The analytical results, including method detection limits, are ' <br /> presented it Appendix A <br /> 23 Future Sampling Procedures ' <br /> I <br /> Monitoring wells MW-1 through MW-23 and wells RW-24, RW-25, and RW-26 have been observed to t <br /> be dry since at least October 25, 1989 The depths of completion of these wells are all less than 68 feet <br /> Depth to water at the site has been observed to be greater than 80 feet in wells MW-27 through MW- <br /> 30 Therefore, wells MW-1 through MW-23 and RW-24, RW-25, and RW-26 will not be included by ' <br /> DERS in future monitoring episodes until the time that data from wells MW-27 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 Joaquin County Health Services <br /> i <br /> I <br /> 3.0 CLOSURE <br /> This report presents DERS' understanding of existing conditions at the subject site The conclusions <br /> contained 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 /> James A Le rman Steven W Pierce Michael Reese <br /> Registered Geologist 5032 Project Hydrogeologist Project Manager <br /> JAL/SWP/MR jc ca <br /> Du Pont Environmental Remediation Services ' <br /> 4005114 Rev 0 Pnnted on Recycled Paper ' <br />