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f <br /> March 1, 1999 <br /> 38737 004 <br /> Mr. Michael J. Infurna,Jr. Harding Lawson Associates <br /> San Joaquin County Public Health.Services <br /> Environmental Health Division <br /> Page 3 <br /> i <br /> groundwater sample from MW-7 indicate that the deeper groundwater plume is present, the need for <br /> additonal work will be evaluated at that time. If additional work is warranted, the final sampling round <br /> will be scheduled after completion of the additional work. <br /> I <br /> Alternatively, if the results from MW-7 indicate that the March 1998 Hydropunch analytical results are ` <br /> due to cross-contamination, then the deeper groundwater plume does not exist. If this the case, HLA will <br /> inform PHS/EHD as to the scheduling of final round of sampling for the monitoring wells. in either case, <br /> the results of the March 98 field work, the final sampling round, and any additional work completed will <br /> be summarized with previously collected data and presented in a Closure Report submitted.to PHS/EHD <br /> and the RWQCB in accordance with RWQCB Appendix B to the Tri Regional Recommendations. <br /> 3 <br /> This letter provides confirmation.that all work will be performed consistent with HLA's work plan, work 1 <br /> plan addendum, and previously submitted Site Safety Plan. Field'activities are tentatively scheduled for <br /> March, 1999. Consistent with your requirements, HLA will notify your office approximately 48 hours <br /> prior to performing any grouting procedures in the field. <br /> If you have any questions or comments please call the undersigned. 1 <br /> Yours very truly, <br /> HARDING LAWSON ASSOCIATES `l D•d t, 0, <br /> 9 f. <br /> No.-6046 <br /> Gary D. Haeck, Ph.D., R.G. ESP p p <br /> ect o gist CAl Fp��\4 <br /> ch el J. Leacox, <br /> Principal Geologist <br /> E <br /> cc: Ms. Mark List-RWQCB <br /> Mr. Bob Cartwright, TVG <br /> Mr. Chris Savage, TVG <br /> Enclosures: Proposed Monitoring Well Location <br /> MJUG D W tb/L:\30000138 73 71W P\38 73 7109.do c <br /> CO) h <br />