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1 <br /> Cieologccal Techfiks Inc Page 3 <br /> Additional Site Characterization Report <br /> Project No 662 2 <br /> February 20,2004 <br /> ' not reveal shallow soil or groundwater contamination along the eastern or southern side of <br /> the parcel <br /> ' In accordance with SJC/EHD directives a continuously cored, singe lboringwas installed <br /> ' on May 30, 2002 A discretely screened deep monitoring well, MW-104, was installed in <br /> the boring This well has been sampled six times since its installation and it has contained <br /> MTBE on all occasions <br /> Since well MW-104 was installed, SJC/EHD staffing had changed In their November 18, <br /> 2002 letter correspondence, SJC/EHD rescinded previously submitted work plans and called <br /> 1 for phased approach to continue the site investigation The phased approached consisted of <br /> cone penetrometer testing (CPT), followed by monitoring well installation, and groundwater <br /> extraction well installation and aquifer testing GTI submitted our January 17, 2003 work <br /> plan to meet the SJC/EHD directives and they approved the CPT and groundwater <br /> extraction well portion of the work plan in their February 14, 2003 letter The CPT borings <br /> and an extraction well were installed in December 2003 and the results of these field <br /> ' activities are discussed below <br /> 2.0 SOIL & GROUNDWATER INVESTIGATION <br /> 2.1 Monitoring Well MW-104 Installation (May 30, 2002) <br /> ' As described in the site history section above, a continuously cored, single boring was <br /> ' installed on May 30, 2002 in accordance with SJC/EHD directives A discretely screened <br /> deep monitoring well, MW-104, was installed in the boring (see Figure 2) This work has <br /> not been documented in report format and is therefore summarized here <br /> ' 2.1.1 Monitoring Well Installation <br /> ' On May 30, 2002, V&W Drilling (C57## 720904) of Isleton, California mobilized to the site <br /> to install monitoring well MW-104 The boring was drilled using an eight inch outside <br /> didmeter continuous flight hollow stem auger to its total depth of 55 feet bgs The boring <br /> ' was continuously logged during drilling with samples obtained in a 3 5" diameter split core <br /> barrel sampler SJC/EHD staff member Mr Sam Savig was on site to witness the field <br /> activities <br /> ' Well MW-104 was constructed with 2 0-inch diameter schedule 40 PVC The following <br /> table illustrates the construction details <br />