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Working to Restore Nature <br /> Quarterly Groundwater Monitoring, Fourth Quarter 1993 February 2, 1994 <br /> Quik Stop Market No 132, Stockton, California F7132 93 <br /> interpreted the groundwater gradient and flow directions for the upper and lower aquifers, <br /> as shown on Plates 3 and 4, respectively In the local upper aquifer, the groundwater level <br /> rose an average of 0 15 foot, ranging from 0 07 foot in well MW-6 to 0 23 foot in well <br /> MW-7 In the local lower aquifer, the groundwater level dropped an average of 0 11 foot, <br /> ranging from 0 03 foot in well MW-3 to 0 17 foot in well MW-2 The apparent groundwater <br /> flow direction in the local upper aquifer is to the southeast at a gradient of approximately <br /> 0 007 (Plate 3) The apparent groundwater flow direction in the local lower aquifer is to <br /> the east-southeast at a gradient of approximately 0 003 (Plate 4) These groundwater flow <br /> directions and gradients are similar to those observed last quarter (RESNA, December 1, <br /> 1993) <br /> Laboratory analyses of the water sample collected from well MW-5 before pumping on <br /> November 10, 1993, (sample MW-5A) indicated TPHg and toluene were detected at <br /> concentrations of 100 parts per billion (ppb) and 0 55 ppb, respectively Laboratory analyses <br /> of the water sample collected from well MW-5 after pumping (sample MW-5B) indicated <br /> toluene and total xylenes were detected at concentrations of 0 56 ppb and 11 ppb, <br /> respectively Laboratory analyses of water sample collected on December 17, 1993, <br /> indicated that TPHg and BTEX were not detected in any of the sampled monitoring wells <br /> Wells MW-3 and MW-4 were not sampled because they are located upgradient of the <br /> underground storage tanks, and historically TPHg and BTEX have not been detected in the <br /> groundwater from these wells The next quarterly groundwater sampling will be conducted <br /> in March 1994 <br /> Reporting Requirements <br /> RESNA recommends a that copy this report be forwarded by Quik Stop Markets, Inc, to <br /> the following agencies <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 /> Ms Elizabeth Thayer <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road <br /> Sacramento, California 95827-3098 <br /> 3 <br />