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ARCADIS Ms. Kathy Amaru <br /> May 26, 2011 <br /> activities will be conducted with a submersible pump placed near the bottom of the <br /> well. The final development task will consist of pumping the well at a steady flow rate <br /> while monitoring groundwater parameters (including pH, temperature, conductivity, <br /> and turbidity) using a water quality meter with flow-through cell. Pumping will <br /> continue until at least three casing-volumes of water have been removed and <br /> consecutive groundwater parameter readings have stabilized as follows: <br /> • pH to within 0.1 unit <br /> • Specific conductivity to within 3 percent <br /> • Turbidity to within 10 percent <br /> • Dissolved oxygen to within 10 percent <br /> • Reduction/Oxidation potential (redox)to within 10 millivolts(mV) <br /> Monitoring Well Sampling <br /> The well will be sampled using low-flow sampling techniques. To measure <br /> groundwater elevation, the monitoring well will be gauged prior to initiating sampling <br /> activities. Before sampling, the monitoring well will be purged at a rate of no more <br /> than 500 milliliters per minute(mL/min) using a decontaminated QED MP-10 bladder <br /> pump (or similar) until field parameters (including pH, temperature, conductivity, and <br /> turbidity) have stabilized as defined in the well development procedures above. In the <br /> event that the well does not recharge at a sufficient rate to support low-flow <br /> sampling, the well will be purged dry and allowed to recharge to 80 percent of its <br /> original water column prior to sampling. After purging activities are complete, <br /> groundwater samples will be collected through the pump into laboratory supplied <br /> sample containers. <br /> The groundwater sample will be sealed, labeled, placed in an ice-chilled cooler and <br /> submitted to Calscience Environmental Laboratories (Calscience), a California <br /> Department of Public Health-certified analytical laboratory located in Garden Grove, <br /> California, under proper chain of custody procedures for analysis of TPH-d using <br /> USEPA Method 8015B (M). <br /> Page: <br /> McD Island Well Install WoUlan_Final,DOC 5/8 <br />