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ti <br /> January 14, 1998 <br /> 38737 004 <br /> Ms. Mary Meays Harding Lawson Associates <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> Page 2 <br /> • di-isopropyl ether(DIPE) <br /> • ethyl tertiary butyl ether(ETBE) <br /> • tertiary amyl methyl ether(TAME) <br /> • In addition, at the request of PHS/EHD, 1,2-dichloroethane (DCA), an additive utilized as a <br /> lead scavenger, will be included with the above suite of analytes. <br /> At the request of PHS/EHD it was agreed that the proposed well MW-7, within the former excavation <br /> location, will be appropriately developed and sampled following the investigation. In addition, all wells <br /> will be resampled once more after a minimum of 30 days following the sampling of well MW-7 in <br /> accordance with the approved analytical program. <br /> CLOSURE REPORT <br /> It was agreed by all those present that the results of the investigation including the above requested items <br /> would be presented within a closure report requesting NFA and submitted in accordance with Appendix <br /> B (RWQCB, 1996). The following information requested in Appendix B were specifically requested by <br /> PHS/EHD: <br /> • Historical water level data would be included as a column within the historical groundwater <br /> analytical summary table. <br /> • All soil analytical data presented in summary tables. <br /> • All boring logs. <br /> • Summary of remedial actions implemented to date. <br /> • Based on reasonable assumptions, estimate remaining mass of contaminants in the soil and <br /> groundwater. <br /> SCHEDULE <br /> An approximate schedule for the completion of the investigation,the quarterly sampling event, and the <br /> submission of the closure report is presented below: <br /> Work Tasks Estimated Time Estimated Completion <br /> Date * <br /> Perform Supplemental Site 3 weeks after notice to February 9, 1998* <br /> Investigation proceed <br /> Perform quarterly sampling event of Minimum of 30 days after March 16, 1998* <br /> all seven monitoring wells. completion of first sampling <br /> of MW-7 <br /> Prepare and submit closure letter 4 weeks after receipt of final April 20, 1998* <br /> report to PHS/EHD and RW CB round of analytical results <br /> Note: * Assumes Notice to Proceed is received on or before January 19, 1998, and availability of <br /> drillj!jS subcontractors. <br /> is, <br />