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Site History 14000 Highway 88, Lockeford, CA Time oil Property No 04-M each well was measured to evaluate elevation, flow direction, and gradient Groundwater with a southeasterly flow at a rate of 0 14 ft/ft was encountered in the wells at depths of 73 27 feet to 84 96 feet below ground surface Since the previous sampling event, groundwater elevation increased in each well by 0 15 feet to 0 78 feet, resulting in an overall increase of 0 78 feet across the site Groundwater flow direction remained consistent with previously collected data, however, gradient increased significantly The variations in groundwater elevation and gradient are most likely due to seasonal variation Analyses identified 10,000 ppb gasoline, 600 ppb benzene, 2,900 ppb toluene, 440 ppb ethylbenzene, and 1,900 ppb xylenes in the sample collected from MW-1 The sample collected from MW-2 contained 340 ppb gasoline, 38 ppb benzene, 1 6 ppb toluene, 23 ppb ethylbenzene, and 39 ppb xylenes The sample collected from MW-3 contained 2,400 ppb gasoline, 390 ppb benzene, 110 ppb toluene, 170 ppb ethylbenzene, and 200 ppb xylenes, and the sample collected from MW-4 contained 170 ppb gasoline, 10 ppb benzene, 3 6 ppb ethylbenzene, and 0 5 ppb xylenes Between the Fourth Quarter 1995 and First Quarters of 1996, gasoline and BTEX concentrations increased in MW-1, MW-2, and MW-3 and decreased in MW-4 The observed fluctuations in hydrocarbon concentrations were likely a result of a general increase to the groundwater elevation, however, not enough data had been collected to evaluate their significance A copy of SECOR's "Quarterly Monitoring Report January - March 1996" dated April 22, 1996 was forwarded to the appropriate regulator agencies on April 29, 1996 • 8