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t <br /> Geofogica(Technics Inc. <br /> 2741??jver(RQad <br /> Modesto,Caffoma 95351 <br /> (209)538 64241ra-X#538-5852 <br /> ' REPORT <br /> Groundwater Monitoring <br /> ' 1$` Quarter 2001 <br /> ' Cardoza <br /> Super Stop Market <br /> 290 N. Main St. <br /> Manteca, CA <br /> Project No 662 2 <br /> ' March 20, 2001 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the I" Quarter 200I groundwater monitoring and testing work that <br /> took place on February 16, 2001 The test results show that detectable concentrations of the <br /> oxygenated fuel compound MTBE were detected ;n two of the three wells BTEX and <br /> TPH-G were not detected in any of the groundwater samples This is the fifth consecutive <br /> monitoring event in which these conditions are present <br /> The average depth to groundwater at the site was 20 55 feet bgs Groundwater gradient <br /> calculations show that groundwater flow was N67°E with a slope of 0 0014 ft/ft <br /> Groundwater direction has varied in all five monitoring events, with the direction of flow <br /> fluctuating between east-northeast to south-southeast, with the dominant direction of flow to <br /> the northeast <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 <br /> to course grained sand alternating with plastic clays The average groundwater elevation on <br />