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Report:Groundwater-quality Monitoring—July 27,2004: 7500 West Eleventh Street,Tracy, CA. Page i <br /> Table of Contents <br /> PROFESSIONAL CERTIFICATION AND LIMITATIONS.... <br /> 1.0 INTRODUCTION....................................................................................................................1 <br /> 1.1 Site Location.........................................................................................................................I <br /> 1.2 Site Codes................................................................................................................... <br /> ..........2 <br /> �- I1.3 Background..........................................................................................................................2 <br /> 1.4 Geology and H dro eolo 4 <br /> 1.5 Distribution of Hydrocarbons in the Subsurface..................................................................5 <br /> 1.5.1 Primary Plume................................................................................................................5 <br /> 1.5.2 Secondary Plume...........................................................................................................6 <br /> 1.5.3 Dispersed Shallow Areas of Subsurface.......................................................................7 <br /> 2.0 JULY 2004 GROUNDWATER-QUALITY MONITORING ROUND ..................................8 <br /> 2.1 Groundwater Elevations and Flow Direction.......................................................................8 <br /> 2.2 Purging of Groundwater-quality Monitoring Wells.............................................................9 <br /> � I <br /> 2.2.1 Disposal of Pure Water 10 <br /> ` 2.3 Recovery of Groundwater Samples from Monitoring Wells.................. .......................10 <br /> 2.4 Analyses of Groundwater Samples ......................................•..----.--.................................... 10 <br /> 2.5 Groundwater Quality in the Near-Surface Unconfined Aquifer......................................... II <br /> 2.5.1 Analytes of Concern in Groundwater Along Principal Plume Axis ........................... 11 <br /> 2.5.2 Analytes of Concern in Groundwater around Fringes of Principal Plume.................. 12 <br /> 2.5.3 Analytes of Concern in Secondary Groundwater Plume ............................................ 13 <br /> 771 <br /> 2.5.4 Groundwater Quality in the Deeper Confined Aquifers <br /> 3.0 MONITORING OF FLOATING PRODUCT........................................................................ 14 <br /> 4.0 MONITORING OF POTABLE WATER SUPPLIES ........................................................... 15 <br /> 4.1 Recovery and Analysis of Samples from Potable Water Supply Wells.............................15 <br /> 4.2 Results of Potable Water Sampling........................................................ ........ 16 <br /> .................... <br /> 4.3 Notification to Well Owners ........ 16 <br /> 5.0 FUTURE ROUNDS OF SAMPLING AND ANALYSIS...................................................... 17 <br /> 5.1 Groundwater-quality Monitoring Round.................... <br /> 5.2 LNAPL Monitoring............................................................................................................ 17 <br /> 5.3 Potable Water Supply Wells............................................................................................... 17 <br /> 6.0 RECOMMENDATIONS........................................................................................................ 18 <br /> 6.1 Closure of Wells in Deep Aquifers .................................................................................... 18 <br /> 6.2 High Concentrations of Hydrocarbons along North Side of West Eleventh Street............ 18 <br /> 6.3 Reduction in Scope and Schedule of Groundwater-quality Monitoring Program..............20 <br /> 6.4 Monitoring of Potable Water Quality.................................................................................20 <br /> 7.0 REFERENCES ...21 <br /> sic <br />