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1 1 1 Council Meetin Minutes December 13, 1 88 Page 13 Council Busine s continued The biggest pr blem the Army sees in the near future, is not a water shortage, but n excess of treated water. The Army feels the City's policies have been met with the construction 0 the GAC system. Connor quoted the City's production policies dated January 1985, whi ch read, liT e Ci ty bel i eves the storage capacity plus the well pumping capaci y with the largest pump out of operation, shall be equal to the maximum daily domestic demand in 16 hours and a 10 hour fire demand of 5,000 gallons per minute". With Wells #8, 9, 10, 11, 12 at their capacity plus the projected capacity for t e GAC System, the total capacity is 7,600 gpm. In addition, the City has 2,600,000 gallons in storage capacity. According to C nnor's calculations, the City would have an excess of capacity. Connor said "t e Army's final point is, as far as we know, the Mt. Simon-Hinckley Aquifer is not contaminated, we are very concerned that additi ona 1 dri 11 i ng and additi ona 1 pumpi ng of Mt. Simon- Hinckley Wells may result in contamination of that aquifer. This view of additi nal contamination is not only the Army's view but also the USGS, and the Minnesota Department of Natural Resources". Connor said wh n drilling through a contaminated area, there is a possibility of contaminating the lower aquifer and also by pumping the well it co ld draw the contamination into the lower aquifer. Larson asked, "referri ng to the statement of cross contami nati on going from M. Simon-Hinckley down. Our new wells, the reconstruction of #8 and #9, and the addition of #10, #11, and #12; would address his problem. So it appears that, we may have to put on a GAC sys em to offset what we have done to remedy our situation". Connor replied "I hope not, we can't say that right now, we just don't know. T e odds are that the more you pump those lower wells, the greater t e possibility of eventually through a naturally occurring frac ure or an artificially occurring fracture; you could draw contamina ion from the Prairie Du Chien-Jordan Aquifer to the Mt. Simon-Hinc ley Aquifer. That's one of the reasons why the Army insisted in the settlement agreement that the City agreed they would use 80% GAC tr ated water. We don't want to get to the situation a year from no or five years from now or ten years from now; to agree about what caused the contamination of the Mt. Simon-Hinckley, that's in nobo y's interest". Council Business Presentation of EPA Covering Replacement ot We 11 #7 Report 88-349