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The final report will include a summary table of monitoring well information for the <br /> purpose of comparison, including such data as filter pack length, total depth of well, <br /> water elevations/dates, and chemical concentrations of concern. <br /> 4.2.1 Assessment of Groundwater Flow Direction and Gradient <br /> The new shallow well will provide additional data to assess the shallow <br /> groundwater flow direction and gradient. After the wells are surveyed, the <br /> groundwater measurements will be converted to elevations. The water level <br /> measurements in the new deep well and the clustered alluvial wells MW2 and <br /> MW5 will provide data to assess the magnitude of any vertical flow gradients <br /> between the shallow and deep aquifers. <br /> 4.3 Miscellaneous Activities <br /> 4.3.1 Decontamination <br /> Adequate decontamination procedures will ensure that samples collected are <br /> representative of actual environmental conditions at the sampling locations, <br /> and that cross-contamination from one sample to another has not occurred. <br /> The decontamination procedures outlined below will be observed. <br /> All drilling equipment that could come into contact with subsurface materials <br /> and/or groundwater will be thoroughly steam-cleaned prior to its use at each <br /> soil or groundwater sampling location. This includes, the drill rod, drill bits, <br /> tremie pipes, well casing, well development pipe, and any pumps used. Steam <br /> Z:TROP-PRA 1999"524-pIdd.W vq-1524.Ld. <br /> 14 <br />