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7-11/Stockton <br /> June 1989 5 <br /> Currently, CTT is proceeding with regularly scheduled <br /> maintenance and monitoring at the site along with steps to update <br /> and modify (as described in CTI's Cost Proposal of November 23, <br /> 1988) the remediation system. The regularly scheduled <br /> maintenance and monitoring has included the following:sampling <br /> alid water-level monitoring in the groundwater monitoring wells; <br /> sampling Trow the area domestic wells; recording hydrocarbon- <br /> product levels in the underground storage tank; monitoring and <br /> maintaining the groundwater remediation and soil-vent systems; <br /> and preparation of project update reports and recommendations. <br /> The latest "Project Update Report" submitted February, 1989 <br /> includes groundwater-gradient direction maps and total petroleum- <br /> hydrocarbon distribution. Two of these maps are attached as a <br /> - reference to the locations selected for the monitoring wells and <br /> the nested monitoring wells (Figures 3 and 4) . The groundwater <br /> gradient direction generally trends toward the east, while the <br /> hydrocarbon plume, evidenced from some of the sampling rounds, <br /> extends toward the north. <br /> The locations of the proposed monitoring wells to the north <br /> and northwest have been selected in order to investigate possible <br /> upgradient sources which may have resulted in the relatively high <br /> levels of contaminants on the north end of the project site. The <br /> locations of the two proposed monitoring well nests were selected <br /> to determine the vertical extent of contamination below the <br /> underground tank pad and downgradient (approximately 150 feet) of <br /> the tank pad. <br /> �� ��h�1111�111Tlik <br /> On 1�1 <br />