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Report:Groundwater-quality Monitoring—July 14-15,2006, 7500 West Eleventh street, Tracy, C14. Page i <br /> Table of Contents <br /> LIMITATIONS.. a <br /> PROFESSIONAL CERTIFICATION AND •••••••••-••'•-'................Ii <br /> 1.0 INTRODUCTION.................................... ...............I................ <br /> 1.1 Site Location....................................................................... <br /> ..................................... <br /> �- 1.2 Site Codes.................. .................................. <br /> ..................................................... 1 <br /> 1.3 Background................................................................................ <br /> 1.4 Site Characterization Studies............................................ <br /> � ..........1.4.1 Groundwater-quality Monitoring........................ <br /> ............................................... 3 <br /> 1.4.2 Monitoring of LNAPL.................................................................................................. <br /> ..........4 <br /> 1.4.3 Testing of Water in Potable Water-supply Wells....................... 4 <br /> 1.4.4 Evaluation of Natural Attenuation ............•.---•••............••••.......'••'-"•"•"" 4 <br /> 1.5 Geology and Hydrogeology .................................................................................................6 <br /> 1.6 Distribution of Hydrocarbons in the Subsurface..................................................................6 <br /> 1.6.1 Primary Plume...................... ....................................................................7 <br /> 1.6.2 Secondary Plume........................................................................................................... <br /> 1.6.3 Dispersed Petroleum Hydrocarbons in Shallow Soils...................................................7 <br /> 2.0 JULY 2006 GROUNDWATER-QUALITY MONITORING ROUND ..................................9 <br /> 2.1 Groundwater Elevations and Flow Direction......................................................................190 <br /> 2.1.1 Groundwater Mound................................................................................................... 10 <br /> i-- 2.2 Purging of Groundwater-quality Monitoring Wells........................................................... 10 <br /> 2.2.1 Disposal of Purge Water...................................................................................I......... <br /> 2.3 Recovery of Groundwater Samples from Monitoring Wells.............................................. 11 <br /> i.� 2.4 Analyses of Groundwater Samples .................................................................................... 11 <br /> 2.5 Groundwater Quality in the Near-Surface Unconfined Aquifer.........................................12 <br /> 2.5.1 Analytes of Concern in Groundwater Along Principal Plume Axis ........................... 12 <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 /> a 2.6 Monitoring of Floating Product.......................................................................................... 13 <br /> 2.7 Monitoring of Potable Water supplies................................................................................ 13 <br /> L 13 <br /> 2.7.1 Recovery and Analysis of Samples from Potable Water Supply Wells...................... <br /> 2.7.2 Results of Potable Water Sampling............................................................................. 14 <br /> 2.7.3 Notification to Well Owners.......................................................................................14 <br /> 3.0 FUTURE GROUNDWATER-QUALITY MONITORING...................................................15 <br /> 3.1 Groundwater-quality Monitoring....................................................................................... 15 <br /> i- 3.2 Monitoring and Management of Light Non-aqueous Phase Liquid................................... 16 <br /> 3.3 Potable Water-quality Monitoring Program....................................................................... 16 <br /> 4.0 REFERENCES....................................................................................................................... 17 <br /> to <br /> TABLES <br /> Table 1: Depths to Groundwater <br /> Table 2: Results of Analyses of Samples of Groundwater <br /> L Table 3: Thickness of Floating Product in Selected Monitoring Wells <br /> Table 4: Results of Analyses of Samples from Potable Water Wells <br /> `" <br /> sic <br />