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Upgradient Environmental Consultants <br /> . January 20, 1995 <br /> Mr Steve Sasson,REHS <br /> San Joaquin County <br /> Environmental Health Division <br /> 445 N San Joaquin Street <br /> Stockton, CA 95201 <br /> JAN 2 5 1995 , <br /> Subject Gillies Trucking <br /> Fourth Quarter Monitoring Report ENVIRONMENTAL HEALTH <br /> Newton Road pERMTISERVICES <br /> Stockton, CA <br /> Dear Mr Sasson <br /> As recommended in Upgradient EAvironmental's groundwater monitoring report for the third quarter of 1994, <br /> Upgrad)ent continued to monitor the depth to groundwater at the site through the end of 1994 Depth measurements <br /> were obtained on November 10 and December 23 to confirm the northwestward groundwater flow direction <br /> observed in September That determination was based on depth measurements that were obtained on September 9 <br /> and reported in the Third Quarter Report Data previously provided by the San Joaquin County Flood Control <br /> District had indicated that the prevailing gradient is to the south <br /> • Table I compares the groundwater depth for the three monitoring events Heading into the rainy season, the depth <br /> decreased by nearly 3 feet between September and December This rise has continued into the new year, as will be <br /> reported in the First Quarter 1995 Monitoring Report <br /> The data obtained to date provide weak support to the southward gradient shown on the county flood control maps <br /> Unfortunately, the groundwater elevation is nearly the same in all three wells, preventing a conclusive interpretation <br /> of the gradient In both months, GT-I and MW-I appear to be slightly upgradient of GT-2(Figures I and 2) <br /> However,very slight short-term changes in the elevation of the water table would be sufficient to cause reversals in <br /> flow direction It is probable that the gradient is very low, allowing groundwater to "slosh"back and forth and <br /> remain relatively stationary over a longer period <br /> Upgradient Environmental Consultants will continue to monitor the groundwater conditions at the site <br /> Groundwater samples were recently obtained, and will be fully discussed in the forthcoming First Quarter Report <br /> We Iook forward to discussing this investigation with you after we have transmitted the First quarter Report <br /> Respectfully Submitted, <br /> Up r tent nviro ental Consultants <br /> C3 CH <br /> � 4 <br /> Victor B Cherven, President <br /> cc Kett Gillies <br /> 411182nd Street 3369 Kimberly Road <br /> Sacramento, CA 95826 Cameron Park, CA 95682 <br /> (916) 452-2891 (916) 677-3055 <br /> Far 457-1817 Fax 677-3055 <br />