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Antonia K. J. Vorster -3- 13 June 1988 <br /> Well Installation <br /> The well installation discussion does not mention how the type of <br /> sand or screen size will be determined. The determination should <br /> be made in the field or based on preliminary exploratory work so <br /> that the sand and screen used are as representative of the actual <br /> conditions as possible. <br /> Soil Sample Collection <br /> The proposed soil sampling calls for logging the boreholes by <br /> collecting samples at 5 foot intervals during the construction of <br /> each monitoring well . Chemical analysis is proposed only for the <br /> 5 foot depth sample from each borehole. <br /> Continuous logging or at least logging at all changes in <br /> lithology as well as the 5 foot intervals, will provide a much <br /> more accurate description of the local hydrogeology. A chemical <br /> analysis should be done at every change as well , not just the <br /> uppermost 5 feet. More thorough logging and chemical analysis <br /> will allow for a more accurate assessment of what, if any, <br /> additional work is needed and how to proceed with that work. <br /> Water Sample Collection <br /> The plan states that the pH, temperature, and conductivity will <br /> be measured at the end of well purging only. The pH, <br /> temperature, and conductivity should be measured from the start <br /> of well purging and continue until these parameters have <br /> stabilized and at least 3 well volumes have been extracted. The <br /> remainder of the water sampling plan appears to be acceptable. <br /> Report Preparation <br /> The proposed final report should be adequate as long as the <br /> modifications are incorporated into the work plan and the results <br /> included in the report. The final report should include a <br /> summarization and tabulated data in the main bodv of the report. <br /> Triple E could include the results of the domestic well. survey in <br /> this report also. <br />