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