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1 <br /> Working to Restore Nature <br />' September 1993 Quarterly Groundwater Sampling & Analysis December 1, 1993 <br /> Quik Stop Market No 132, Stockton, California F7132 93 <br />' Summary of Results and Discussion <br /> A summary of the analytical results from current and past well samplings is presented in <br />' Table 1. Plates 3 and 4 show the groundwater elevation contour maps for the upper and <br /> lower aquifers, respectively, based on the water level data for September 23, 1993, shown <br /> in Table 1 In the local upper aquifer, the groundwater levels in wells MW-5 dropped 0 99 <br /> feet and in wells MW-6 and MW-7 dropped 108 feet. In the local lower aquifer, the <br /> groundwater level dropped an average of 1.21 feet, these declines ranged from 117 feet in <br /> MW-4 to 128 feet in MW-2 The apparent groundwater flow direction in the local upper <br />' aquifer is to the south-southeast at a gradient of approximately 0 011 (Plate 3) The <br /> apparent groundwater flow direction in the local lower aquifer is to the east-southeast at a <br /> gradient of approximately 0 004 (Plate 4) These groundwater flow directions and gradients <br />' are similar to those observed last quarter (RESNA, August 16, 1993) <br /> Laboratory analytical results of the samples collected from well MW-5 did not detect TPHg <br />' and BTEX in the sample collected before the pumping of well MW-5 on August 11, 1993, <br /> but TPHg and benzene at concentrations of 140 ppb and 0 56 ppb, respectively were <br /> detected in the sample collected after pumping was completed Analytical results of the <br /> September 23, 1993 groundwater sampling and analyses detected TPHg only in well MW-5 <br /> at a concentration of 88 ppb, however BTEX were not detected in any of the groundwater <br />' samples Wells MW-3 and MW-4 were not sampled because historically the groundwater <br /> in the wells have had nondetectable TPHg and BTEX <br />' The next quarterly groundwater sampling will be conducted in December 1993. <br /> Reporting Requirements <br /> A copy of this report should be forwarded by Quik Stop Markets, Inc , to the following <br /> agencies in a timely manner <br />' Mr Michael Collins, R E H S <br /> Environmental Health Specialist <br />' San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P O Box 2009 <br /> Stockton, California 95201 <br /> 3 <br />