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GENESIS ENGINEERING 6 REDEVELOPMENT <br /> Ms. Amy Terrell <br /> August 21, 2006 <br /> Page 5 <br /> Traffic Control <br /> Many of the proposed monitoring wells will be situated on public right-of-ways and public <br /> parking areas to allow for easier access. Traffic control procedures will be implemented at these <br /> locations. Traffic control setup (signs,barricades, etc.) and maintenance will be implemented in <br /> accordance with the Work Area Traffic Control Handbook (W.A.T.C.H. Manual), endorsed by <br /> the American Public Works Association. <br /> Task 3—Well Development and Groundwater Sampling <br /> The groundwater monitoring wells will be developed at least 24 hours after installation. <br /> Development will consist of surging and pumping until the water is relatively sediment free and <br /> specific parameters (temperature,pH, and specific conductance) have stabilized. <br /> Groundwater samples will be collected from the new monitoring wells approximately 72 hours <br /> after the wells have been developed. Prior to sampling,the depth to groundwater will be <br /> measured in all of the monitoring wells. Low-flow sampling techniques using a peristaltic pump <br /> will be utilized for sampling, if feasible. During purging,the discharge will be monitored for <br /> specific conductivity,temperature, and pH. Purging will continue urrti1 the parameters have <br /> stabilized as follows: the pH is within 0.1 pH units of the previous measurement; specific <br /> conductivity is within 10 percent of the previous measurement; and temperature is within 1 <br /> degree centigrade of the previous measurement. Field parameters will be recorded on field <br /> sampling data forms. Once the parameters have stabilized, the groundwater samples will be <br /> collected in laboratory supplied sample bottles. Samples will be labeled, stored in an ice-chilled <br /> cooler, and delivered to the analytical laboratory along with chain-of-custody documentation. <br /> The groundwater samples will be analyzed for nitrates using EPA Method 300. <br /> Field Quality Assurance/Quality Control (QAC) Samples <br /> Field QA/QC samples will be collected to help evaluate the sampling event and laboratory data. <br /> QA/QC samples will consist of two duplicate samples. These samples will be analyzed for <br /> nitrates using EPA Method 300. The two duplicate samples will be randomly collected in the <br /> field during sampling event. The duplicate samples will be analyzed to provide information on <br /> sampling variability and as a means to provide additional laboratory QC. <br />