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7-Eleven/Stockton 16 <br /> May, 1989 <br /> During this reporting period six monitoring wells were not <br /> available for groundwater monitoring and sampl:.ng. Prolonged <br /> regional drought conditions have caused groundwater levels to <br /> decline sharply. As a result, MW-2, MW-3 and MW-4 have gone dry. <br /> MW-5, located in a low-lying area which tends to collect standing <br /> water, is unavailable during the winter and spring months. MW-6 <br /> is no longer in service, since it was abandoned in September 1986 <br /> due to the reconstruction of Thornton Road. MW-12 is also no <br /> longer available, since a stuck pump obstructed it in January <br /> 1987. <br /> REMEDIATION SYSTEMS <br /> The remediation systems currently operating at the site <br /> consist of a groundwater-extraction system and a soil-vent <br /> system. The groundwater-extraction system consists of pumping <br /> wells designed to depress the water table and remove free product <br /> and an air stripper designed to treat the dissolved constituents <br /> in the groundwater. The soj.l-vent system was installed to <br /> control hydrocarbon vapors and to aid in reducing the adsorbed <br /> contamination in the vadose--zone soils near the tank pit. <br /> GROUNDWATER REMEDIATION SYSTEM <br /> Groundwater is currently being extracted from PW-1 at a rate <br /> of 0.4-gallon per minute (gpm) and from the recovery well (RW-1) <br /> at a rate of 1.3 gpm. The total pumping rate of 1.7 gpm remains <br /> consistent with those reported during previous reporting periods. <br /> The areas the pumping is influencing are illustrated on the <br /> previously referenced groundwater gradient maps (Figures 4, 5, <br /> and 6) . <br /> GROUNDWATER <br /> TECMOLOGY.INC. <br />