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• • <br /> After completion, the well is thoroughly developed to remove residual drilling materials from the wellbore, <br /> and to improve well performance by removing fine material from the filter pack that may pass into the well. <br /> Well development techniques used may include pumping, surging, bailing, swabbing,jetting, flushing and <br /> airlifting. All development water is collected either in drums or tanks for temporary storage and is properly <br /> disposed of depending on laboratory analytical results. To minimize the potential for cross-contamination <br /> between wells, all development equipment is either steam cleaned or properly washed prior to use. At the <br /> request of the client, and approval of the regulatory agency,the well may be developed before placement of <br /> the bentonite plug and annular seal. <br /> Soil Cuttings From Drilling Operations <br /> Soil generated during drilling operations will be placed in DOT rated 55-gallon drums and stored on-site. <br /> The soil will remain on-site until the proper method for disposal is assessed. <br /> Sampling Soil Cuttings <br /> Sampling of the soil cuttings is performed under the direction of a registered geologist or civil engineer. <br /> Prior to collecting soil samples,Delta personnel will measure and calculate the volume of soil in the drums. <br /> Soil samples are typically collected from 0.5 to two feet below the surface of the drum. In some instances, <br /> two to four soil samples may be collected from each sampling interval and composited into one prior to <br /> laboratory analysis. The soil samples are collected in cleaned, brass or stainless tubes of varying diameter <br /> and lengths (typically two x six inches) or other appropriately cleaned sample containers. A hand-driven <br /> sampler holding the sample container may be used. To reduce the potential for cross-contamination between <br /> samples,the sampler is cleaned between each sampling event. Upon recovery,the sample container is sealed <br /> to minimize the potential of volatilization and cross-contamination prior to chemical analysis. Soil sampling <br /> tubes are typically closed at each end with Teflon sheeting and plastic caps. The soil sample is collected, <br /> labeled and handled according to the Quality Assurance Plan. <br /> Ground Water and Liquid-Phase Petroleum Hydrocarbon Depth Assessment <br /> A water/hydrocarbon interface probe is used to assess the liquid-phase petroleum hydrocarbon (LPH) <br /> thickness, if present. A water level indicator is used to measure the ground water depth in monitoring wells <br /> that do not contain LPH. Depth to ground water or LPH is measured from a datum point at the top of each <br /> monitoring well casing. The datum point is typical a notch cut in the north side of the casing edge. If a <br /> water level indicator is used,the tip is subjectively analyzed for hydrocarbon sheen. <br /> 4 <br />