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Over the time penod from April 2000 to September 2003, MTBE is evidently either <br /> stable or decreasing at this site for all of the monitoring wells that met the statistical <br /> evaluation criteria TBA is apparently decreasing or stable except for wells MW-02, <br /> MW-07, MW-14, and MW-15 The highest TBA on-site is at MW-08, which shows <br /> either a decreasing trend or no trend, and non-detect MTBE concentrations MW-07 is <br /> downgradient of the tanks and dispenser island MW-14 and MW-15 are also <br /> downgradient monitor wells <br /> Wells MW-16 through MW-20 were recently installed at the site These wells have not <br /> yet met minimum sampling criterion of detected data, and a trend cannot yet be <br /> established <br /> 27101 Ortega Highway site- The regional setting for the site is in a valley On-site depth <br /> to groundwater varies from approximately 30 to 40 feet below ground surface The <br /> groundwater gradient at the eastern edge of the site is approximately 0 2 ft/ft to the west <br /> The groundwater gradient on the central and western part of the site, including the former <br /> tank pit and dispenser islands, is approximately 0 01 ft/ft to the south <br /> Over the time period from March 2000 to September 2003, MTBE is evidently either <br /> stable or decreasing for all of the monitored wells at this site except for MW-2 TBA is <br /> apparently decreasing or stable except for wells MW-2, MW-8, MW-9, MW-12, and W- <br /> 2 <br /> 5 <br />