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Geofogica(Technics Inc. <br /> r 2741!P,rmr Rgad <br /> Modesto,Caf forma 95351 <br /> f209)538-6424/347,#538-5852 <br /> REPORT <br /> Groundwater Monitoring <br /> ' Spring 2000 <br /> Cardoza <br /> Super Stop Market <br /> 290 N. Main St. <br /> Manteca, CA <br /> Project No 662 2 <br /> July 27, 2000 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the Spring Quarter 2000 round of groundwater monitoring and <br /> testing that took place on June 16, 2000 The test results show that detectable concentrations <br /> of the oxygenated fuel compounds (OFCs) were detected in two of the three wells BTEX <br /> and TPH-G were not detected in any of the groundwater samples <br /> ' The average depth to groundwater at the site was 20 7 feet bgs Groundwater gradient <br /> calculations show that groundwater flow was N81°E with a slope of 0 0035 ft/ft This <br /> represents an easterly shift of groundwater direction since the January 2000 monitoring <br /> ' event <br /> 10 GROUNDWATER MONITORING <br /> 1.1 Hydrogeology of Site <br /> The dominant soil type in the upper 40 feet of subsurfaceeolo is soils investigated is fine to <br /> g g g <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 />