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Quarterly Groundwater Monitoring Report- First Quarter 2016 <br /> L&M Operable Unit- West Weber Avenue and North Lincoln Street, Stockton, CA <br /> April 29, 2016 <br /> • <br /> TABLE OF CONTENTS <br /> 1.0 INTRODUCTION.....................................................................................................................1 <br /> 1.1 BACKGROUND ..............................................................................................................1 <br /> 1.2 SITE AND SURROUNDING AREA....................................................................................2 <br /> 2.0 GROUNDWATER MONITORING AND SAMPLING................................................................4 <br /> 2.1 SITE INFORMATION........................................................................................................4 <br /> 2.2 WORK PERFORMED........................................................................................................4 <br /> MONITORING AND SAMPLING DATA AND RESULTS...........................................................5 <br /> 2.2.1 Groundwater Monitoring Summary....................................................................5 <br /> 2.2.2 Groundwater Sample Analysis............................................................................6 <br /> 2.2.3 Groundwater Sampling Results...........................................................................6 <br /> 2.2.4 Quality Assurance and Quality Control for Groundwater Samples................7 <br /> 2.2.5 Waste Disposal......................................................................................................8 <br /> 3.0 REMEDIAL SYSTEMS STATUS..................................................................................................9 <br /> 3.1 DUAL PHASE EXTRACTION SYSTEM...............................................................................9 <br /> 3.1.1 DPE System Removal Activities ...........................................................................9 <br /> 3.1.2 DPE (Groundwater) Operational and Analytical Data - 1Q16 ........................9 <br /> 3.1.3 Historic DPE Mass Removal (Groundwater).......................................................9 <br /> 3.1.4 Historic DPE Mass Removal (Vapor) .................................................................10 <br /> 3.2 L&M OU AND APARTMENT SOIL VAPOR EXTRACTION SYSTEMS ..............................10 <br /> 3.3 OFF-SITE PRODUCT RECOVERY REMEDIATION SYSTEM SUMMARY ..........................10 <br /> 3.3.1 Product Recovery Remediation System Operational Data ...........................10 <br /> 4.0 SOIL VAPOR SAMPLING...................................................................................................12 <br /> 4.1 SOIL VAPOR SAMPLING FIRST QUARTER 2016 ...........................................................12 <br /> 4.2 SOIL VAPOR SAMPLING METHODS.............................................................................12 <br /> 4.2.1 Quality Assurance/Quality Control-Samples and General Laboratory Notes <br /> ..............................................................................................................................12 <br /> 4.3 UPSV SOIL VAPOR CONCENTRATION TRENDS...........................................................13 <br /> 4.4 APSV SOIL VAPOR CONCENTRATION TRENDS..........................................................14 <br /> 4.5 SOIL VAPOR SAMPING CONCLUSIONS.....................................................................14 <br /> 5.0 CONCLUSIONS AND RECOMMENDATIONS...................................................................15 <br /> 5.1 GROUNDWATER SAMPLING RESULTS..........................................................................15 <br /> 5.2 PLUME STABILITY ..........................................................................................................16 <br /> 5.3 REMEDIATION SYSTEM.................................................................................................16 <br /> 5.4 SOIL VAPOR.................................................................................................................16 <br /> 6.0 LIMITATIONS........................................................................................................................17 <br /> • <br /> Stantec i <br />