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L & M OPERABLE UNIT- FIRST QUARTER 2012 SITE STATUS, REMEDIAL SUMMARY, <br />AND GROUNDWATER MONITORING REPORT <br />I:\Tidewater\TW Stockton (P2A)\QMRs\2012\1Q12\1Q12 QSSR QRSR QMR Stockton_FINAL.doc i <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...............................................................................................2.2 <br />2.3 FIRST 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............................................................2.3 <br />2.3.2.1 Separate Phase Hydrocarbons...........................................................................2.3 <br />2.3.2.2 Petroleum Hydrocarbons and Fuel Oxygenates .................................................2.4 <br />2.3.2.3 Volatile Organic Compounds..............................................................................2.5 <br />2.3.2.4 Semi-volatile Organic Compounds .....................................................................2.5 <br />2.3.2.5 Dissolved Metals................................................................................................2.5 <br />2.3.2.6 Quality Assurance/Quality Control Samples.......................................................2.6 <br />2.3.2.7 General Laboratory Notes..................................................................................2.7 <br />2.4 FIRST QUARTER 2012 B-ZONE GROUNDWATER RESULTS .......................................2.8 <br />2.4.1 B-Zone Groundwater Gradient ...........................................................................2.8 <br />2.4.2 B-Zone Groundwater Quality Data .....................................................................2.8 <br />2.4.2.1 Separate Phase Hydrocarbons...........................................................................2.8 <br />2.4.2.2 Petroleum Hydrocarbons and Fuel Oxygenates .................................................2.9 <br />2.4.2.3 Volatile Organic Compounds............................................................................2.10 <br />2.4.2.4 Semi-volatile Organic Compounds ...................................................................2.10 <br />2.4.2.5 Dissolved Metals..............................................................................................2.10 <br />2.4.2.6 Quality Assurance/Quality Control Samples.....................................................2.11 <br />2.4.2.7 General Laboratory Notes................................................................................2.11 <br />2.5 FIRST QUARTER 2012 C-ZONE GROUNDWATER RESULTS.....................................2.12 <br />2.5.1 C-Zone Groundwater Gradient Data.................................................................2.12 <br />2.5.2 C-Zone Groundwater Quality Data ...................................................................2.13 <br />2.5.2.1 Separate Phase Hydrocarbons.........................................................................2.13 <br />2.5.2.2 Petroleum Hydrocarbons and Fuel Oxygenates ...............................................2.13 <br />2.5.2.3 Volatile Organic Compounds............................................................................2.14 <br />2.5.2.4 Semi-volatile Organic Compounds ...................................................................2.14 <br />2.5.2.5 Dissolved Metals..............................................................................................2.14 <br />2.5.2.6 Quality Assurance/Quality Control Samples.....................................................2.15 <br />2.5.2.7 General Laboratory Notes................................................................................2.15 <br />2.6 FIRST QUARTER 2012 D-ZONE GROUNDWATER RESULTS.....................................2.16 <br />2.6.1 D-Zone Groundwater Gradient Data.................................................................2.16 <br />2.6.2 D-Zone Groundwater Quality Data ...................................................................2.16 <br />2.6.2.1 Separate Phase Hydrocarbons.........................................................................2.16 <br />2.6.2.2 Petroleum Hydrocarbons and Fuel Oxygenates ...............................................2.16 <br />2.6.2.3 Volatile Organic Compounds............................................................................2.17 <br />2.6.2.4 Semi-volatile Organic Compounds ...................................................................2.18