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initial coring and well construction and that well screen <br /> intervals will be based on lithology, not on predetermined <br /> lengths. <br /> 5 . Ref: page 7 of Attachment B: <br /> (Re: page 4-9 of the Workplan) <br /> The Department concurres with MCTC ' s response, however, <br /> samples collected during "the established well sampling <br /> schedule" i. e. , during the quarterly sampling round <br /> must be analyzed for: <br /> a. Total Chromium, hexavalent chromium, copper and <br /> arsenic. <br /> o In accordance with Title 40, Code of Federal <br /> Regulations (40CFR) , Subpart 270 . 14 (c) (ii) , MCTC must <br /> also analyze MW-5 and MW-6 samples for Appendix IX <br /> constituents (See Federal Register, July 9 , 1987 for a <br /> list of constituents) . <br /> (Re: page 4-10 of the Workplan) <br /> As indicated above, MCTC must sample and analyze selected <br /> interior and exterior wells for hexavalent chromium, total <br /> chromium, copper and arsenic. Limiting the quarterly <br /> monitoring program to total chromium is unacceptable at this <br /> time. <br />