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• Collect ground water elevation data accurate to 0 01 feet <br /> i0 Purge and sample six ground water monitoring wells to obtain representative samples <br /> i • Install sampling ports on the ground water supply wells at the site and collect samples <br /> for laboratory analysis <br /> ' • Submit all ground water samples to a California State certified analytical laboratory <br /> for analysis of petroleum hydrocarbon constituents <br /> ' • Prepare this report summarizing the methodology and analytical data obtained and <br /> making recommendations for further work as warranted <br /> i <br /> i 4.0 METHODOLOGY <br /> ' 4.1 Ground Water Sample Collection <br /> On December 21, 1995, the six monitoring wells were purged and sampled Prior to <br /> M purging, each well was measured for depth to water and total depth accurate to within <br /> 0 01 feet Each well was then purged with a submersible pump or PVC bailer until a <br /> minimum of three casing volumes of water had been removed and temperature, pH, <br /> ' electrical conductivity and dissolved oxygen had stabilized to within 10% of the previous <br /> readings This insured that formational waters were drawn into each well All measured <br /> parameters were recorded on the appropriate field logs and are presented in Appendix B <br /> iTable 1 summarizes the field logs for the measured parameters <br /> The bailer or pump, hose, and electrical leads were decontaminated before and between <br /> ' each well purging by washing the exterior with a solution of laboratory grade detergent <br /> The bailer was then scrubbed and the pump was flushed by pumping at least 20 gallons of <br /> ' the solution through the pump and hose The exterior of the bailer and pump, hose, and <br /> electrical leads were then rinsed with potable water At least 20 gallons or potable water <br /> was pumped through the pump and hose The bailer and pump were then rinsed with <br /> idistilled water <br /> After purging, sampling of each well was conducted using new, clean, dedicated <br /> disposable polyethylene bailers Distilled water was poured into the bailer used for each <br /> well and a bailer blank was collected prior to well sampling The bailers were then <br /> American Geological Services, Inc <br /> i CA95DE-029 <br /> 4 <br />