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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 /> Field Procedures <br /> ' Existing Wells <br /> G-R collected water level and separate phase hydrocarbon(SPH)measurements from <br /> the monitoring well network on November 5 and 6,2008.Water level measurements <br /> were used to calculate the water table elevation at each well and develop a <br /> ' potentiometric surface map of the site.The data allowed for subsequent estimation of <br /> the groundwater flow direction. <br /> ' Groundwater samples were subsequently collected from 15 monitoring wells including: <br /> MW-226, MW-236, MW-24A,MW-25A, MW-26A, MW-27A, MW-28A, MW-29A, <br /> MW-30A, MW-31A, MW-32A, MW-47A, MW-50A, MW-50B and MW-51A. <br /> Groundwater samples were collected in accordance with California Environmental <br /> Protection Agency(CaIEPA)procedures outlined in Representative Sampling of <br /> Groundwater for Hazardous Substances(CaIEPA, 1995). <br /> ' An approximate three well volume purging and sample technique was performed using <br /> either a disposable bailer or a decontaminated stack pump and disposable bailer for <br /> ' groundwater purging and sample collection. Monitoring and sampling was conducted <br /> using the following series of activities and protocols: <br /> • During the purge cycle of the 15 sampled wells,groundwater field parameter <br /> ' measurements consisting of specific conductance,pH and temperature were <br /> measured using a groundwater quality meter <br /> ' • Approximately three 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 <br /> ' • Pre-purge measurements were taken for dissolved oxygen and oxygen <br /> reduction potential from every monitored well and post-purge measurements <br /> ' were taken from the 15 sampled wells <br /> • After the purge cycle of the 15 sampled wells was complete,a groundwater <br /> ' sample was collected for analysis with a disposable polyethylene bailer and <br /> transferred to the appropriate laboratory-supplied sample containers preflled <br /> with preservative <br /> ' 3of17 <br />