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Stantec <br /> Quarterly Status Summary Report Fourth Quarter 2011 <br /> Chevron and ARCO Commingled Plume No.CP0034 <br /> February 2, 2012 <br /> TABLE OF CONTENTS <br /> 1.0 INTRODUCTION .................................................................................................................1 <br /> 2.0 SITE INFORMATION...........................................................................................................1 <br /> 3.0 MONITORING AND SAMPLING..::.....................................................................................2 <br /> 3.1 Work Performed..........................................................................................................2 <br /> 3.2 Monitoring and Sampling Procedures.......................................................................2 <br /> 3.3 Waste Disposal ...........................................................................................................2 <br /> 4.0 MONITORING AND SAMPLING DATA AND RESULTS ................ <br /> 4.1 Groundwater Monitoring Data Analysis....................................................................2 <br /> 4.2 Groundwater Sample Analysis ..................................................................................2 <br /> 4.3 Remedial System Status ......:...........................:.........................................................2 <br /> 4.4 Quality Assurance/Quality Control...............................................................................2 <br /> 5.0 DISCUSSION AND RECOMMENDATION ............................................................................3 <br /> 5.1 Discussion .....:......................................................... 3 <br /> ................................. <br /> 5.1.1 Groundwater Sampling Results.............................................................................3 <br /> 5.1.2 Remediation System Updates............................................... :.............................3 <br /> 5.1.3 Site Conceptual Model Updates............................................................................3 <br /> 5.1.4 Trends...................................................................................................................3 <br /> 5.1.5 Data Gaps................. <br /> 5.1.6 Plume Stability...............................:......................................................................3 <br /> 5.1.7 Protocol Changes....:...................... ...............3 <br /> ......................................................... <br /> 5.1.8 Future Work..........................................................................................................3 <br /> 5.1.9 Additional Assessment..........................................................................................4 <br /> 6.0 LIMITATIONS......:....... ..:............................:...................................................::...............::..5 <br /> LIST OF FIGURES <br /> Figure 1 Site Plan <br /> 94275 QSSR 4Q11.doc <br /> I <br />