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WELL INSTALLATION AND INTERIM REMEDIAL ACTION REPORT <br />www.arcadis.com <br />FINAL_Forward CHCF (CDCR) Well Installation Report_10182024 <br /> <br />ii <br />Contents <br />Acronyms and Abbreviations ................................................................................................................................ vi <br />1 Introduction ...................................................................................................................................................... 1 <br />2 Background ...................................................................................................................................................... 1 <br />2.1 Objective and Well Installation Overview.............................................................................................. 1 <br />2.2 Site Description ....................................................................................................................................... 2 <br />3 Regional Geology and Hydrogeology ........................................................................................................... 3 <br />4 Well Installation Activities .............................................................................................................................. 4 <br />4.1 Pre-Field Activities .................................................................................................................................. 4 <br />4.1.1 Site-Specific Health and Safety Plan ................................................................................................. 4 <br />4.1.2 Underground Utility Locating ............................................................................................................. 4 <br />4.1.3 Permits .................................................................................................................................................. 4 <br />4.2 Field Activities ......................................................................................................................................... 4 <br />4.2.1 Drilling and Lithologic Logging ......................................................................................................... 5 <br />4.2.2 Extraction and Monitoring Well Installations.................................................................................... 5 <br /> May 2024 Extraction and Monitoring Well Installations (CHCF) ...........................................5 <br /> July 2024 Extraction and Monitoring Well Installation (NCYCC) ..........................................6 <br />4.2.3 Extraction and Monitoring Well Development .................................................................................. 7 <br /> May 2024 Extraction and Monitoring Well Development (CHCF) ..........................................7 <br /> July/August 2024 Extraction and Monitoring Well Development (NCYCC) .........................7 <br />4.2.4 Hydraulic Testing ................................................................................................................................. 8 <br />4.2.5 Monitoring Well Survey ....................................................................................................................... 9 <br />4.2.1 Deviations from the Work Plan........................................................................................................... 9 <br />4.2.2 Investigation-Derived Waste............................................................................................................... 9 <br />5 Geological and Hydraulic Assessment ....................................................................................................... 10 <br />5.1 CDCR Geology and Hydrogeology ...................................................................................................... 10 <br />5.2 CDCR Extraction Well Hydraulic Testing ............................................................................................ 11 <br />5.2.1 CDCR-EW-3 Hydraulic Testing Data Analysis ................................................................................ 11 <br />5.2.2 CDCR-EW-4 Hydraulic Testing Data Analysis ................................................................................ 12 <br />5.2.3 Hydraulic Interpretation Summary ................................................................................................... 14 <br />5.3 Groundwater Plume Distribution ......................................................................................................... 14 <br />5.4 CDCR Groundwater Capture Assessment .......................................................................................... 15