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Geofogka(Technlocs Inc. <br /> 2741 Rover Road <br /> M-&O-,C,-S(=Ja 95351 <br /> (209)538 6424/Fax#538-5852 <br /> REPORT <br /> Groundwater Monitoring <br /> ' Winter Quarter 1999/2000 <br /> Cardoza <br /> Super Stop Market <br /> 290 N Main St. <br /> ' Manteca, CA <br /> Project No 662 2 <br /> ' February 17, 2000 <br /> MEXECUTIVE SUMMARY <br /> ' This report summarizes the Winter Quarter 1999/2000 round of groundwater monitoring and <br /> testing that took place on January 20, 2000 The test results show that detectable <br /> concentrations of the oxygenated fuel compounds (OFCs) were detected in two of the three <br /> wells BTEX and TPH-G were not detected in any of the groundwater samples <br /> ' The average depth to groundwater at the site was 20 4 feet bgs Groundwater gradient <br /> calculations show that groundwater flow was S17°E with a slope of 0 0036 ft/ft <br /> ' 1.0 GROUNDWATER MONITORING <br /> ' 1.1 Hydrogeology of Site <br /> The dominant soil type in the upper 40 feet of subsurface geologic soils investigated is fine to <br /> course grained sand alternating with plastic clays The average groundwater elevation in <br /> June 1998 was about 18 2 feet above MSL, which is approximately 20 4 feet below ground <br /> ' surface <br />