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Stantec <br /> Quarterly Groundwater Status Summary Report Fourth Quarter 2011 <br /> Chevron and ARCO Commingled Plume No. CP0034 <br /> February 2, 2012 <br /> 5.0 DISCUSSION AND RECOMMENDATION <br /> 51 DISCUSSION <br /> 5.1.1 Groundwater Sampling Results <br /> k <br /> No groundwater samples were collected during 4Q1 T. <br /> 5.1.2 Remediation System Updates <br /> During the quarter, no changes have.been made to the remedial equipment located on property. <br /> The system remains non-operational. <br /> 5.1.3 Site Conceptual Model Updates _ <br /> No new data was gathered during 4Q11 to necessitate an update to the Site Conceptual Model. <br /> 5.1.4 Trends <br /> No new data was gathered during 4Q11 to compare-with previous trends: <br /> 5.1.5 Data Gaps <br /> Stantec has not identified any data gaps_ within` the data gathered for the Quarterly Status <br /> Summary Report Fourth Quarter 2011. <br /> 5.1.6 Plume Stability <br /> No new data was gathered during 4Q111 to determine plume stability. Data gathered during <br /> previous quarterly monitoring and sampling events indicate that the plume is stable and that the <br /> current well array delineates the plume. <br /> Recommendations <br /> 5.1.7 Protocol Changes <br /> Stantec recommends continuing the current monitoring and sampling schedule for the site. <br /> 5.1.8 Future Work <br /> Stantec will perform the next semi-annual monitoring and sampling event during the first quarter of <br /> 2012. <br /> Stantec will conduct a sensitive receptor survey and submit a No Further Action Report for review. <br /> 94275 QSSR 4Q11.doc 3 <br />