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Donn Diebert <br /> Page 2 <br /> March 9, 1989 <br /> o Regarding the proposed "stage 2" plan (ref; page 20 of the <br /> subject report) : <br /> I do concur with the iterative process presented, <br /> however, if any "stage 1" wells are found to be <br /> contaminated, installing monitoring wells at the <br /> locations described i.e. , " one downgradient. . ; one <br /> laterally outward. . . ; and one adjacent to, and deeper <br /> than the stage 1 well" may not provide adequate <br /> definition of the vertical distribution. I therefore <br /> suggest MCTC modify their proposed "stage 2" plan to <br /> include, if needed, the installation of shallower <br /> monitoring wells . <br /> o Construction of Phase V wells: <br /> I suggest that MCTC be advised that construction <br /> standards for the Phase IV wells apply to all Phase V <br /> wells. That is, the Department will not approve the <br /> installation of monitoring wells with screened <br /> intervals in excess of twenty (20) feet. Use of <br /> centralizer is also required. The specified locations <br /> of centralizers is as follows: For blank casing, a <br /> maximum spacing (between centralizers) is 40 feet. <br /> For screened intervals of twenty (20) feet, <br /> centralizers must be located at the base and top of the <br /> interval . For screened intervals of less than twenty <br /> feet, centralizers must be located at the base of the <br /> screen and then every forty feet thereafter. <br /> As a final comment, I would like to mention that it is imperative <br /> that the all agencies are kept abreast of field activities and <br /> are notified if any delays are expected. I do feel MCTC and <br /> their consultants have in the past maintained good communication <br /> with the Department. The only request I have at this time is <br /> that all parties take action to ensure the lines of communication <br /> are maintained. <br />