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1 <br /> ARCADIS GERAGHTY&MILLER <br /> demonstrates that the risk of dragging impacted soil downward in the geologic profile with the <br />' drilling equipment or the creation of a vertical contaminant migration pathway was significantly <br /> increased by drilling too close to the release area Nonetheless, at the insistence of SICPHS, it <br />' was agreed that the proposed soil bonng be relocated further south and between wells U3 and <br /> UM, and that groundwater samples would be collected at minimum of 10 foot intervals from <br />' first encountered water to 50 feet, and that below that depth samples would be collected at <br /> changes in hthology or a maximum of 10 foot intervals ARCADIS Geraghty & Miller also <br />' agreed to reanalyze samples with MTBE detections at a fixed laboratory using EPA Method <br /> 8260A. The size of the hollow stem auger to be used for the drilling was specified as 8 1/4 <br />' inches outside diameter <br /> Subsequently, a Site map showing the revised location of the proposed boring and the <br />' former location of the USTs used prior to 1967 was provided to SJCPHS By telephone on <br /> August 31, 1998, SICPHS (Ms Margaret Lagono) indicated that the new boring location had <br />' been approved <br /> Correspondence and telephone notes documenting the development and approval of <br /> the Site work plan are attached in Appendix A. <br /> 1 � i <br /> This Supplemental Site Characterization report documents the results of field work, file <br />' reviews, and analyses conducted by ARCADIS Geraghty & Miller for the Site between <br /> August, 1998 and March, 1999 The report also references and utilizes data from Site <br />' investigations conducted by Gettler-Ryan, Inc and UNOCAL in-house technical staff <br /> t3 <br />