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Eli <br /> Report.- Groundwater-quality Monitoring—December 20--21, 2005, 7500 West Eleventh Street, Tracy, Cit. Page i <br /> Table of Contents <br /> PROFESSIONAL CERTIFICATION AND LIMITATIONS..................................uc <br /> 1.0 INTRODUCTION.................................................................................................................... 1 <br /> 1.1 Site Location......................................................................................................................... 1 <br /> 1.2 Site Codes............................................................................................................................. 1 <br /> 1.3 Background.................... ..... I <br /> 1.3.1 Site Characterization Studies <br /> i ...........................................................................:........ <br /> .2 <br /> 1.3.2 Groundwater-quality Monitoring..................................................................................2 <br /> 1.3.3 Monitoring of LNAPL..................................................................................................3 <br /> 1.3.4 Testing of Water in Potable Water-supply Wells..........................................................4 <br /> 1.3.5 Evaluation of Natural Attenuation................................................................................4 <br /> 1.4 Geology and Hydrogeology............................................................................. .....4 <br /> ............... <br /> 1.5 Distribution of Hydrocarbons in the Subsurface..................................................................6 <br /> 1.5.1 Primary Plume...............................................................................................................6 <br /> 1.5.2 Secondary Plume...........................................................................................................7 <br /> 1.5.3 Dispersed Petroleum Hydrocarbons in Shallow Soils...................................................8 <br /> 2.0 DECEMBER 2005 GROUNDWATER-QUALITY MONITORING ROUND.......................9 <br /> t. <br /> 2.1 Groundwater Elevations and Flow Direction.......................................................................9 <br /> t: <br /> 2.1.1 Groundwater Mound................................................................................................... 11 <br /> 2.2 Purging of Groundwater-quality Monitoring Wells........................................................... 11 <br /> 2.2:1 Disposal of Purge Water............................................................................................. 1 I <br /> 2.3 Recovery of Groundwater Samples from Monitoring Wells.............................................. 12 <br /> 2.4 Analyses of Groundwater Samples .................................................................................... 12 <br /> 2.5 Groundwater Quality in the Near-Surface Unconfined Aquifer......................................... 13 <br /> 2.5.1 Analytes of Concern in Groundwater Along Principal Plume Axis ........................... 13 <br />{ 2.5.2 Analytes of Concern in Groundwater around Fringes of Principal Plume.................. 13 <br /> 2.5.3 Analytes of Concern in Secondary Groundwater Plume ............................................ 14 <br /> r <br /> 3.0 MONITORING OF FLOATING PRODUCT........................................................................ 15 <br /> 4.0 MONITORING OF POTABLE WATER SUPPLIES ........................................................... 16 <br /> 4.1 Recovery and Analysis of Samples from Potable Water Supply Wells............................. 16 <br /> 4.2 Results of Potable Water Sampling.................................................................................... 17 <br /> 4.3 Notification to Well Owners <br /> 5.0 CONCLUSIONS ........................ <br /> " 6.0 RECOMMENDATIONS........................................................................................................ 19 <br /> C <br /> 8.0 REFERENCES.......................................................................................................................20 <br /> TABLES <br /> Table 1: Depths to Groundwater <br /> Table 2: Results of Analyses of Samples of Groundwater <br /> Table 3: Thickness of Floating Product in Selected Monitoring Wells <br /> Table 4: Results of Analyses of Samples from Potable Water Wells <br /> sic <br /> f <br />