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ffl,LEEDSHILL-HERKENHOFF, INC. <br /> The wells will be drilled using hollow stem augering equipment,Sby a Cal.ife"r-iiia <br /> licensed C-57 water well contractor who is experienced in monitoring well <br /> installations. Drilling will be conducted without the use of Tubri.cation on the <br /> drilling equipment. All drilling equipment and casing materials will be high <br /> pressure steam cleaned prior to initiating drilling operations at each of the <br /> monitoring well sites. All drilling will be done under the supervision of a <br /> professional engineer. A detailed boring log will be prepared, noting soil types <br /> (Unified Soil Classification System) , moisture conditions, and drilling <br /> penetration rates. <br /> All monitoring wells will be constructed and developed to provide discrete, <br /> representative samples. Monitoring wells will be developed using a combination <br /> of air development, surging, and/or pumping as directed by the on-site engineer. <br /> Due to the suspected volatile compounds being investigated, extreme care will <br /> be exercised during the collection of these samples to ensure representativeness. <br /> EPA and Health Services protocol will be followed by field personnel during the <br /> collection, preservation, and transport of collected samples. Water quality <br /> sampling stabilization records and chain-of-custody forms will accompany each <br /> set of samples. <br /> Groundwater Sampling <br /> Representative groundwater samples will be collected from each of the three <br /> monitoring wells and from each of the four existing monitoring wells. The <br /> samples will be collected using a 3-inch teflon bailer. Each well will be bailed <br /> in an attempt to purge a minimum quantity of water and assure a representative <br /> aquifer sample, while field monitoring pH, conductivity, and temperature to <br /> establish stability. All equipment will be high pressure steam cleaned prior <br /> to installation. <br />