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ARCADIS GERAGHTY&MILLER <br /> not agree that the proposed investigation would complete the Site investigation necessary to <br />' provide data for the preparation of a corrective action plan(CAP), SJCPHS requested <br /> 1 <br /> inclusion of soil sampling above and below the current groundwater level until the vertical <br />' extent of soft contamination has been demonstrated, relocation of the boring proposed in the <br /> work plan closer to the center of the known impacted area, redefinition of the criteria for the <br />' collection of groundwater grab samples to include sampling at changes in hthology, <br /> recommendation that vapor extraction and air sparge wells be installed during the proposed <br />' work, direction to confirm any sample detections of methyl tertiary butyl ether (MTBE) by the <br /> EPA Method 8020 with analysis of a suite of fuel oxygenates by a fixed laboratory using EPA <br />' method 8260A, and direction that the size of the hollow stem auger to be used for drilling <br /> should be specified <br />' ARCADIS Geraghty & Miller responded to the SJCPHS comments to the May 26, <br /> 1998 work plan in a letter dated July 24, 1998 ARCADIS Geraghty& Miller requested that <br />' the original portion of the May 26, 1998 work plan which proposed preparation of a <br /> Corrective Action Plan(CAP) be withdrawn until such tune as SJCPHS and UNOCAL agree <br />' that the extent of the release has been adequately characterized by investigation, data <br /> evaluation, and reporting In the same letter it was also agreed work would be conducted to <br />' identify records on the elevation of shallow groundwater relevant to the Site between the first <br /> installation of the Site USTs and the present ARCADIS Geraghty&Miller disagreed with the <br />' appropriateness of sampling soils beneath groundwater level and argued that the most <br /> appropriate way to characterize and monitor impacts to groundwater was to sample and <br />' monitor the groundwater medium itself Despite the disagreement, it was agreed that separate <br /> soil samples would be taken below the groundwater in the saturated zone as directed by the <br />' SJCPHS ARCADIS Geraghty&Miller also cautioned that it was not in favor of locating the <br /> proposed boring closer to the release area than its proposed drilling site because experience <br />' 2 <br />