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f <br /> Chronology <br /> 365 Louise Ave., Lathrop <br /> 04/09/97 Letter request for closure based on declining hydrocarbon <br /> concentrations, lack of down gradient receptors and that <br /> environmental impact is minimal. <br /> 05/09/97 PHS/EHD letter response to closure requesting to split a water <br /> sample from MW3 to verify the results of the 316197 water sample. <br /> 05/23/97 Water sample obtained from MW3. San Joaquin County split of <br /> sample taken to FGL Environmental Laboratory in Stockton. WHF, <br /> Inc. consulting company split of sample taken to CLS Labs in <br /> Rancho Cordova. <br /> 06/09/97 PHSIEHD letter that although the results of the split sampling was <br /> similar, the results did not confirm the 316197 results. Letter <br /> requested that a closure report be prepared and that the report <br /> would be evaluated by PHS/EHD's Technical Review Committee. <br /> 08/08/97 Site Closure Summary report. <br /> 09/26/97 Technical Review Committee {TRC} meeting in which site was <br /> evaluated. <br /> 10/08/97 PHS/EHD letter stating TRC decided the source of the continuing <br /> groundwater contamination had not been identified and that further <br /> investigation was required. <br /> 10/28/97 Responsible party requested closure from the State Water <br /> Resources Control Board Cleanup Fund (SWRCB/CF). <br /> 01/22/98 SWRCB/CF letter supporting additional investigation. <br /> 04/03/98 Vertical and Lateral Extent Confirmation Work Plan. <br /> 4/17-28198 6 soil borings drilled and one geoprobe performed. <br /> 07/10/98 Revised Phase II Site Characterization - Continued report of 4198 <br /> soil boring and geoprobe sample results. <br /> 07/28/98 Addendum to Revised Phase 11 Site Characterization - Continued <br /> report. <br /> 07/30/98 PHSIEHD concurrence with closure request. <br />