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Second Semiannual 2011 Groundwater Monitoring Report <br /> Former Texaco Service Station <br /> C Chevron Site ID 309075 <br /> i <br /> February 28, 2012 <br /> C TABLE OF CONTENTS <br /> 1 <br /> 1.0 INTRODUCTION ........................................................................... <br /> ......................................1 <br /> 2.0 SITE INFORMATION.................................:...........................................................................1 <br /> 3.0 GROUNDWATER MONITORING AND SAMPLING................................I........... <br /> .................2 <br /> 3.1 Work Performed..................................: .............. - .... ..........................2 <br /> 3.2 Monitoring and Sampling Procedures ..... ............ ...................................................2 <br /> 3.3 Waste Disposal.....................:..........................................................:............................3 <br /> 4.0 MONITORING AND SAMPLING DATA .......:......................................................................3 <br /> 4.1 Groundwater Monitoring Data Analysis..........................................................................3 <br /> 4.2 Groundwater Sample Analysis <br /> . <br /> 43 Remedial System Status.................................................. . <br /> r .............................................4 <br /> 5.0 DISCUSSIONS, CONCLUSIONS AND RECOMMENDATIONS............:.............................4 <br /> 5.1 Discussion ..............................................................................:............................. . . ...4 <br /> 5.1.1 Groundwater Monitoring Results................................. .......... . .........................4 <br /> 5.1.2 Groundwater Sampling Results,.............................................. .............................5 <br /> 5.1.3 Remediation System Updates...........::.:......................................................... ......6 <br /> 5.1.4 Plume Stability......:.............. <br /> . ..................................................................................6 <br /> 5.1.5 Site Conceptual Model Updates......:.:..........................:..........;:.......:....................7 <br /> 5.1.6 Trends...............................:...................:..:..........:......::....:..... ..............................7 <br /> .. <br /> 5.1.7 Data Gaps........... .......................:........................:................:..............................7 <br /> r 5.2 Conclusions and Recommendations.............................................................................7 <br /> L <br /> i <br /> v <br /> • <br /> • <br /> r _ t <br /> L <br /> r <br /> 9:laprojectlenv\chevronl30907516 detiverableslperiodic monitoring1201ITsa111temppdtlteM1309075 2sa11 gmr fin 02282012.doc i <br />