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7-Eleven/Stockton 7 <br /> November 1989 <br /> impermeable bed within the upper Mehrten Formation. Good quality <br /> - groundwater is generally present in the unconsolidated formations <br /> under unconfined conditions, although minor confined aquifers <br /> exist. <br /> SCOPE OF WORK <br /> Services performed by GTI during this reporting period <br /> consisted primarily of regularly scheduled operation and <br /> maintenance of the remediation system, and monitoring and <br /> sampling of the groundwater. specifically, the following <br /> services have been conducted by GTI since the previous update <br /> report was submitted in August, 1989: <br /> o Monitored on-site and off-site wells for depth-to- <br /> water and depth--to-product on six separate occasions. <br /> o Sampled groundwater from fifteen monitoring wells and <br /> from ten nearby domestic wells for laboratory analyses. <br /> o Maintained the groundwater remediation and soil-vent <br /> systems, including sampling and analyses of the <br /> groundwater-treatment system influent and effluent. <br /> o Drilled three off-site soil borings and installed three <br /> 2-inch-diameter monitoring wells to varying depths to <br /> construct a downgradient monitoring well cluster. <br /> o Drilled one off-site soil boring and completed it as a <br /> 2-inch-diameter monitoring well to further investigate <br /> a potential upgradient source of petroleum <br /> hydrocarbons. <br />