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al � <br /> c7c0bglral nc&%irs low. Page 2 <br /> ' Well Installation and Quarterly <br /> Groundwater Monitoring Report <br /> Project No. 1030.2 <br /> ' June 18,2002 <br /> ' The average groundwater elevation has increased 3.33 feet since the previous monitoring <br /> event in December of 1999. The elevation is the highest recorded at the site to date. <br /> ' Gradient bearing is N55°E with a slope of 0.0042 ft/ft. These results are consistent with <br /> previous groundwater monitoring events. <br /> t1.0 SITE BACKGROUND <br /> The site has been undergoing investigation activities since 1995 when three monitoring <br /> wells and one soil boring were installed. Groundwater flow has been to the northeast for <br /> most of the site history. <br /> On June 14, 1995, Geological Technics Inc. {GTI} installed three monitoring wells s and <br /> advanced one soil boring in order to evaluate the vertical and lateral extent of gasoline <br /> range petroleum hydrocarbons. <br /> M On February 16, 1999, GTI personnel supervised the installation of one groundwater <br /> monitoring well down-gradient of the former UST to further define the lateral extent of <br /> gasoline contamination in the soil and groundwater. This well shows low levels of gasoline <br /> range hydrocarbons. <br /> In response to a request by Mr. Ron Rowe of SJC PHS/EHD, GTI prepared a work plan on <br /> ' January 18, 2000, to define the lateral extent of the soil and groundwater contamination at <br /> the site. On April 20, 2000, Ms. Lori Duncan of SJC PHSIEHD issued a letter denying the <br /> approval of the work plan. During phone conversations in May of 2000, Ms Duncan <br /> requested that a work plan be prepared for the installation of a deeper monitoring well near <br /> the source to define the vertical extent of the contamination and the installation of a sentinel <br /> well between the source and the domestic well. <br /> ' GTI submitted a new work plan on June 9, 2000, proposing the installation of a single deep <br /> monitoring well. Ms. Duncan approved the work plan on June 28, 2000. <br /> A dela in the work 1 <br /> y pan implementation occurred due to a change in the Responsible Party. <br /> Cost pre-approval was obtained on October 28, 2001. <br /> Beginning in April of 2002, Geological Technics Inc performed the following scope of <br /> work: <br /> • Installed one deep monitoring well to 35 feet below grade (MW-101). <br /> • Field screened soil samples. <br /> • Developed the new monitoring well. <br />