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' Fourth Quarter/Annual <br /> 2008 Groundwater <br /> ARCADIS Monitoring Report <br /> ' Chevron Bulk Fuel Terminal <br /> 100-1621 <br /> ' 22888 Kasson Road <br /> Banta,California <br /> Groundwater monitoring and sampling Feld data sheets are presented in Appendix A. <br /> ' Purge water and equipment decontamination water generated during the sampling <br /> event was collected by G-R,transported by G-R to their temporary storage facility in <br /> Dublin, California and staged until it could be properly disposed of by Integrated Waste <br /> ' Management(IWM). <br /> Newly Installed Wells <br /> ' ARCADIS collected water level measurements from 18 newly installed monitoring wells <br /> on November 3,4, 11, 12 and 13,of 2008.The newly installed monitoring wells are <br /> named: MW-70UA, MW-70A,MW-70B, MW-71UA, MW-71 A, MW-71B, MW-72UA, <br /> MW-72A, MW-72B, MW-73UA, MW-73A,MW-73B, MW-74UA, MW-74A, MW-74B, <br /> MW-75UA, MW-75A and MW-756. Survey data is not currently available for the newly <br /> ' installed wells;therefore,water level measurements could not be used to calculate the <br /> water table elevation at each well. <br /> ' Groundwater samples were subsequently collected from the 18 newly installed and <br /> developed monitoring wells.Groundwater samples were collected in accordance with <br /> CaIEPA procedures outlined in Representative Sampling of Groundwater for <br /> ' Hazardous Substances(CaIEPA, 1995). <br /> An approximate ten well volume purging and sample technique was performed using a <br /> decontaminated stainless steel and disposable bailer for groundwater purging and <br /> sample collection. Monitoring and sampling was conducted using the following series <br /> of activities and protocols: <br /> ' • During the purge cycle,groundwater field parameter measurements consisting <br /> of specific conductance, pH,turbidity and temperature were measured using a <br /> groundwater quality meter <br /> • Approximately ten times the volume of standing water was removed from the <br /> sampled monitoring wells and field parameters were recorded on a well <br /> ' volume basis(due to dewatering,monitoring wells MW-72A, MW-74UA and <br /> MW-75A were not purged ten well volumes) <br /> • Pre-purge and post-purge measurements were taken for dissolved oxygen and <br /> oxygen reduction potential <br /> ' 4of17 <br />