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Stantec <br /> L & M OPERABLE UNIT- FOURTH QUARTER AND ANNUAL 2010 SITE STATUS, <br /> REMEDIAL SUMMARY, AND GROUNDWATER MONITORING REPORT <br /> Table of Contents <br /> 2.6.2.3 Volatile Organic Compounds............................................................................2.16 <br /> 2.6.2.4 Semi-volatile Organic Compounds ...................................................................2.16 <br /> 2.6.2.5 Dissolved Metals ..............................................................................................2.16 <br /> 2.6.2.6 Quality Assurance/Quality Control Samples.....................................................2.16 <br /> 2.6.2.7 General Laboratory Notes ................................................................................2.17 <br /> 2.7 FOURTH QUARTER 2010 SEPARATE PHASE HYDROCARBONS AND HYDROCARBON <br /> CONCENTRATION TRENDS .........................................................................................2.17 <br /> 2.7.1 Shallow Zone ...................................................................................................2.17 <br /> 2.7.1.1 Separate Phase Hydrocarbons.........................................................................2.17 <br /> 2.7.1.2 Fuel Oxygenates and Petroleum Hydrocarbon Concentrations ........................2.19 <br /> 2.7.2 Deep Zone .......................................................................................................2.20 <br /> 2.7.2.1 SPH..................................................................................................................2.20 <br /> 2.7.2.2 Fuel Oxygenates and Hydrocarbon Concentrations .........................................2.21 <br /> 2.8 ARSENIC........................................................................................................................2.24 <br /> 2.9 PURGE WATER STORAGE AND DISPOSAL................................................................2.24 <br /> 2.10REQUESTED CHANGES TO MONITORING AND REPORTING PROGRAM................2.24 <br /> 3.0 STATUS OF REMEDIATION ACTIVITIES .......................................................................3.1 <br /> 3.1 DUAL PHASE EXTRACTION SYSTEM............................................................................3.1 <br /> 3.1.1 Dual Phase Extraction Operations Summary......................................................3.1 <br /> 3.1.2 Dual Phase Extraction System Operational and Analytical Data —4Q10............3.1 <br /> 3.2 APARTMENT SOIL VAPOR EXTRACTION SYSTEM ......................................................3.2 <br /> 3.2.1 Apartment Soil Vapor Extraction Operations Summary ......................................3.2 <br /> 3.2.2 Apartment Soil Vapor Extraction Operational and Analytical Data —4Q10 .........3.2 <br /> 3.3 SOIL VAPOR EXTRACTION SYSTEM.............................................................................3.2 <br /> 3.3.1 Soil Vapor Extraction Operations Summary........................................................3.2 <br /> 3.3.2 Soil Vapor Extraction Operational and Analytical Data —4Q10...........................3.3 <br /> 4.0 SOIL VAPOR SAMPLING ................................................................................................4.1 <br /> 4.1 PREVIOUS SOIL VAPOR SAMPLING ACTIVITIES..........................................................4.1 <br /> 4.2 SOIL VAPOR SAMPLING FOURTH QUARTER 2010 ......................................................4.1 <br /> 4.2.1 Soil Vapor Sampling...........................................................................................4.1 <br /> 4.2.2 APSV Soil Vapor Concentrations .......................................................................4.2 <br /> 4.2.2.1 APSV Trends .....................................................................................................4.2 <br /> 4.2.3 UPSV Soil Vapor Concentrations .......................................................................4.2 <br /> 4.2.3.1 UPSV Trends .....................................................................................................4.2 <br /> 4.2.4 Quality Assurance/Quality Control-Samples and General Laboratory Notes.......4.2 <br /> 4.2.5 Conclusions and Recommendations ..................................................................4.3 <br /> 5.0 SUMMARY OF 2010 ANNUAL MONITORING AND SAMPLING.....................................5.1 <br /> 5.1 SHALLOW ZONE TRENDS IN GROUNDWATER GRADIENT.........................................5.1 <br /> 5.2 B-ZONE TRENDS IN GROUNDWATER GRADIENT........................................................5.1 <br /> 5.3 C-ZONE TRENDS IN GROUNDWATER GRADIENT .......................................................5.1 <br /> 5.4 D-ZONE TRENDS IN GROUNDWATER GRADIENT .......................................................5.2 <br /> 5.5 SHALLOW AND DEEP ZONE SPH AND SHEEN TRENDS .............................................5.2 <br /> Iffidewater7W Stockton(Parcel2A-0415)\Reports\QMR\2010\4010-Annual\4Q10 and Annual QSSRQRSRQMR Stockton_FINAL.doc ii <br />