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Stantec <br /> L & M OPERABLE UNIT- FOURTH QUARTER AND ANNUAL 2012 SITE STATUS, <br /> REMEDIAL SUMMARY, AND GROUNDWATER MONITORING REPORT <br /> Table of Contents <br /> 1.0 INTRODUCTION ..............................................................................................................1.1 <br /> 1.1 SITE DESCRIPTION.........................................................................................................1.2 <br /> 1.2 REGIONAL GEOLOGY/HYDROGEOLOGY .....................................................................1.3 <br /> 2.0 GROUNDWATER MONITORING AND SAMPLING.........................................................2.1 <br /> 2.1 GROUNDWATER MONITORING AND SAMPLING PROCEDURES................................2.1 <br /> 2.2 LABORATORY ANALYSIS ...............................................................................................2.1 <br /> 2.3 FOURTH QUARTER 2012 SHALLOW GROUNDWATER RESULTS...............................2.2 <br /> 2.3.1 Shallow Zone Groundwater Gradient..................................................................2.2 <br /> 2.3.2 Shallow Zone Groundwater Quality Data............................................................2.2 <br /> 2.3.2.1 Separate Phase Hydrocarbons...........................................................................2.3 <br /> 2.3.2.2 Petroleum Hydrocarbons and Fuel Oxygenates .................................................2.3 <br /> 2.3.2.3 Dissolved Arsenic...............................................................................................2.4 <br /> 2.3.2.4 Quality Assurance/Quality Control Samples.......................................................2.4 <br /> 2.3.2.5 General Laboratory Notes..................................................................................2.5 <br /> 2.4 FOURTH QUARTER 2012 B-ZONE GROUNDWATER RESULTS...................................2.5 <br /> 2.4.1 B-Zone Groundwater Gradient ...........................................................................2.5 <br /> 2.4.2 B-Zone Groundwater Quality Data .....................................................................2.6 <br /> 2.4.2.1 Separate Phase Hydrocarbons...........................................................................2.6 <br /> 2.4.2.2 Petroleum Hydrocarbons and Fuel Oxygenates .................................................2.6 <br /> 2.4.2.3 Quality Assurance/Quality Control Samples.......................................................2.7 <br /> 2.4.2.4 General Laboratory Notes..................................................................................2.7 <br /> 2.5 FOURTH QUARTER 2012 C-ZONE GROUNDWATER RESULTS...................................2.7 <br /> 2.5.1 C-Zone Groundwater Gradient Data...................................................................2.7 <br /> 2.5.2 C-Zone Groundwater Quality Data .....................................................................2.8 <br /> 2.5.2.1 Separate Phase Hydrocarbons...........................................................................2.8 <br /> 2.5.2.2 Petroleum Hydrocarbons and Fuel Oxygenates .................................................2.8 <br /> 2.5.2.3 Quality Assurance/Quality Control Samples.......................................................2.9 <br /> 2.5.2.4 General Laboratory Notes................................................................................2.10 <br /> 2.6 FOURTH QUARTER 2012 D-ZONE GROUNDWATER RESULTS.................................2.10 <br /> 2.6.1 D-Zone Groundwater Gradient Data.................................................................2.10 <br /> 2.6.2 D-Zone Groundwater Quality Data ...................................................................2.10 <br /> 2.6.2.1 Separate Phase Hydrocarbons.........................................................................2.10 <br /> 2.6.2.2 Petroleum Hydrocarbons and Fuel Oxygenates ...............................................2.11 <br /> 2.6.2.3 Quality Assurance/Quality Control Samples.....................................................2.11 <br /> 2.6.2.4 General Laboratory Notes................................................................................2.12 <br /> 2.7 FOURTH QUARTER 2012 SEPARATE PHASE HYDROCARBONS AND HYDROCARBON <br /> CONCENTRATION TRENDS .........................................................................................2.12 <br /> 2.7.1 Shallow Zone ...................................................................................................2.12 <br /> 2.7.1.1 Separate Phase Hydrocarbons.........................................................................2.12 <br /> 2.7.1.2 Fuel Oxygenates and Petroleum Hydrocarbon Concentrations ........................2.14 <br /> 2.7.2 Deep Zone .......................................................................................................2.15 <br /> 2.7.2.1 SPH..................................................................................................................2.15 <br /> I:\Tidewater\TW Stockton(P2A)\QMRs\2012\4Q12-Ann ual\4Q12 and Annual QSSR QRSR QMR Stockton_FINAL.doc <br />