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L & M OPERABLE UNIT- FIRST QUARTER 2012 SITE STATUS, REMEDIAL SUMMARY, <br />AND GROUNDWATER MONITORING REPORT <br />Table of Contents <br />I:\Tidewater\TW Stockton (P2A)\QMRs\2012\1Q12\1Q12 QSSR QRSR QMR Stockton_FINAL.doc ii <br />2.6.2.5 Dissolved Metals..............................................................................................2.18 <br />2.6.2.1 Quality Assurance/Quality Control Samples.....................................................2.18 <br />2.6.2.2 General Laboratory Notes................................................................................2.18 <br />2.7 FIRST QUARTER 2012 SEPARATE PHASE HYDROCARBONS AND HYDROCARBON <br />CONCENTRATION TRENDS .........................................................................................2.19 <br />2.7.1 Shallow Zone ...................................................................................................2.19 <br />2.7.1.1 Separate Phase Hydrocarbons.........................................................................2.19 <br />2.7.1.2 Fuel Oxygenates and Petroleum Hydrocarbon Concentrations ........................2.22 <br />2.7.2 Deep Zone .......................................................................................................2.23 <br />2.7.2.1 SPH..................................................................................................................2.23 <br />2.7.2.2 Fuel Oxygenates and Hydrocarbon Concentrations .........................................2.24 <br />2.8 ARSENIC........................................................................................................................2.27 <br />2.9 PURGE WATER STORAGE AND DISPOSAL................................................................2.28 <br />2.10REQUESTED CHANGES TO MONITORING AND REPORTING PROGRAM................2.28 <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 Systems Summary .........................................................3.1 <br />3.1.2 Dual Phase Extraction System Operational and Analytical Data – 1Q12............3.1 <br />3.2 L&M OU AND APARTMENT SOIL VAPOR EXTRACTION SYSTEMS.............................3.2 <br />3.2.1 L&M OU and Apartment Soil Vapor Extraction Systems Summary.....................3.2 <br />3.2.2 L&M OU and Apartment Soil Vapor Extraction Systems Operational Data – 1Q12 <br />...........................................................................................................................3.2 <br />3.2.3 L&M OU Soil Vapor Extraction System Analytical Data – 1Q12..........................3.2 <br />3.2.4 Apartment Soil Vapor Extraction System Analytical Data – 1Q12.......................3.2 <br />3.3 SEPARATE PHASE HYDROCARBON REMOVAL...........................................................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 FIRST QUARTER 2012...........................................................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.......4.3 <br />4.2.5 Conclusions and Recommendations ..................................................................4.3 <br />5.0 RECENT SUBMITTALS AND CORRESPONDENCE.......................................................5.1 <br />6.0 PLANNED ACTIVITIES FOR THE SECOND QUARTER 2012 ........................................6.1 <br />7.0 LIMITATIONS...................................................................................................................7.1