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DISSOLVED OXYGEN READINGS <br /> All Dissolved Oxygen readings are taken using YSI meters (e g YSI Model 58 or equivalent YSI meter) <br /> These meters are equipped with a YSI stirring device that enables them to collect accurate in-situ <br /> ' readings The probe/stirring devices are modified to allow downhole measurements to be taken from <br /> wells as small as two-inch diameter <br /> The probe and reel is decontaminated between wells as described above The meter is calibrated <br /> between wells as per the instructions in the operating manual The probe and stirrer is lowered into the <br /> water column allowed to stabilize before use <br /> ' OXIDATION REDUCTION POTENTIAL READINGS <br /> All readings are obtained with either Corning or Myron-L meters (e g Corning ORP-65 or a Myron-L <br /> ' Ultrameter GP) The meter is cleaned between wells as described above The meter is calibrated at the <br /> start of each day according to the instruction manual In use the probe is placed in a cup of freshly <br /> ' obtained monitoring well water and allowed to stabilizeyses <br /> Lrp005 865 <br />