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i � I <br /> lr <br /> First Semiannuai10f2 Groundwater Monitoring Report <br /> C Former Texaco Service Station <br /> Chevron Site ID 309075 <br /> June 21, 2012 <br /> TABLE OF CONTENTS <br /> 1.0 INTRODUCTION ............ ............... . ......................................... ........... ......................1 <br /> 2.0 SITE INFORMATION.............................................................................................................1 <br /> 3.0 GROUNDWATER MONITORING AND SAMPLING.............................................................2 <br /> 3.1 Work Performed...........:..................................:::.....................................:.......................2 <br /> 3.2 Monitoring and Sam piing Procedures.............................................................................2 <br /> 3.3 Waste Disposal...............................................................................................................3 <br /> r 4.0 MONITORING AND SAMPLING DATA................................................................................3 <br /> k.� <br /> 4.1 Groundwater Monitoring Data Analysis............................................................................3 <br /> 4.2 Groundwater Sample Analysis.....::......................................:..........................................3 <br /> 4.3 Remedial System Status ..................................................:.............................................4 <br /> 4.4 QA/QC .............................................................:.....................:.........................................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......................................................::..:..............................................6 <br /> 5.1.5 Site Conceptual Model Updates .....:........................... ...........................................6 <br /> 5.1.6 Trends.........................:................................................:..........:...............................7 <br /> 5.1.7 Data Gaps...........................................:.........................:..........................................7 <br /> ` 5.2 Conclusions and Recommendations ...............:...................:...........................................7 <br /> L - <br /> C <br /> I <br /> g:\aprojectkenNAchevron\30907516 deliverables\periodic monitodng1201211sa121text1309075 1sa12 gmr fin 06212012.doc - I <br />