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mar,MEMH <br /> "� .s <br /> 2 <br /> direction was S25W with a gradient of 25 feet/mile in October <br /> 1986. This is more southerly than the [low direction at the <br /> Geweko site. <br /> 2. Water levels were measured in the wells on the Geweke site. <br /> The calculated flow direction from monitoring wells MW--1, <br /> M11-3, and MW-4 was 535W with a gradient of 21 feet/mile on <br /> December 22, 1966. This compares with S66W with a gradient <br /> of 27 fsef:/mile on February 11, 1986, and 540W with a <br /> gradient of 26 feet/mile on July •14, 1986. This variation <br /> indicates that there is a seasonal adjustment in the <br /> ;J groundwater flow direction due to natural groundwater <br /> recharge' and to local pumping during the irrigation season. <br /> However, the groundwater gradient remains fairly constant <br /> throughout the year. A comparison of water levels for <br /> February, July, and December shows 1.5 feet or less of <br /> seasonal fluctuation Beneath the site. <br /> 3. It appears that the underground storage tanks reportedly <br /> located at the real estate office adjacent to the Geweke site <br /> j have been removed. It is unclear if there was any contamina- <br /> tion observed at the time of removal; however, the Lodi Fire <br /> Department Certificate of Inspection does not note any. <br /> Conclusions <br /> Based on the results of these new data, SC concludes the <br /> following; <br /> a <br /> 1. The report of contaminated groundwater beneath the Beacon � <br /> station, located obliquely upgrad-rent northwest of the Geweke <br /> site, supports the need for a more extensive review of 'the <br /> groundwater contamination problem in this area of Lodi. This <br /> problem is more widespread than one which could be caused <br /> r <br />