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r oxygenates (0 99 ppm) and BTEX (0 81 to 4 2 ppm) ` The site immediately south of Cal Tk was a key-lock fueling station for many years The USTs ` were removed two or three years ago Investigative work is underway at the site but EI is not aware of the contamination levels encountered We have been told that groundwater flow ` direction is northeast from that site, whereas the flow direction is southeasterly from the Cal Tk site 5.2 Recommendations J 1 Used oil contamination (from the former used oil USTs) appears to be confined generally ` to MW-2 EI recommends that floating product be removed from MW-2 periodically (once or twice per month, depending upon recharge rate) until this contamination is removed 2 Diesel contamination (from the former diesel USTs) is moderate and appears to be ` dechrung with time EI recommends monitoring diesel levels as part of the Quarterly Monitoring Program from the four groundwater monitoring wells J ` 3 Gasoline contamination is apparent in MW-4 EI recommends a simultaneous sampling program with the investigators responsible for the site adjacent to Cal Tk Groundwater elevations will be determined at each well on each site on the same day, so that groundwater flow direction and gradient can be determined for the combined sites This 1 � will provide additional information necessary to try to determine the source of r_ contamination at MW-4 (Kier and Wright, Civil Engineers and Land Surveyors, r established a casing elevation for the nearest monitoring well on the adjacent property at the same time they established casing elevations for MW-1 through MW-4 on the Cal Tk - site This will ensure consistent elevation data for the suggested simultaneous monitoring event ) 1 4 General — continue to sample the four monitoring wells (MW-1 through MW-4) on a M quarterly basis to provide additional data on which to base any further actions Environeenng,Inc Project No 00.011 08 16 i