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Page Three • B. Army Phase II Study. The Army has concluded that TCAAP is a source of contaminants and that the contaminants are migrating from TCAAP to the southwest. My staff concurs and believes that contaminants are likely also migrating to the northwest in shallow ground water. A'Phase• II Study is necessary to not only locate the sources of contaminants at TCAAP but also to investigate the mechanisms of contaminant transport within and beyond TCAAP and to determine the fate of TCAAP contaminants transported beyond TCAAP boundaries. Based on the information currently available to my staff, the- appropriate areas for the Army's initial off-base study include the area between TCAAP's southwest corner and Long Lake north of "Butcher's Railroad Spur" and the area between TCAAP's northwest corner and Rice Creek. Subsequent studies may be required for additional areas. According to your February 23 letter, USATHAMA is already initiating a Phase II study. However, -it is unclear whether the questions set forth above are part of the Army's proposed work. I request that the Army submit to the MPCA by April 1, 1983, a Phase II study proposal that includes the above areas of investigation. My staff will review the proposal and submit revisions. C. Army Contaminant Removal and Control . You state in your letter that the Army will take actions to control sources of contaminant migration once they are defined. We agree that this is an important action once the sources of contamination are located. We expect a commitment • from the Army that it will respond in a proper and expeditious fashion to alleviate those TCAAP contaminant sources that are identified during the Phase II Study. In addition, we request that the Army implement now any remedial measures which would be appropriate at this time. D. Water Supply. A number of off-base private drinking water wells have been contaminated to such a degree that the use of these wells as a source of drinking water and other household purposes has been precluded. Six such private parties directly southwest of TCAAP are now without a useable source of water. As discussed in this letter, we believe that sources on -TCAAP have caused this contamination. We request that the Army immediately arrange to provide these private parties with an adequate source of noncontaminated water. If the Army's Phase II Study_ or other investigations discover other wells similarly contaminated by TCAAP sources, we would expect the Army to provide those well users with noncontaminated water also. Please give us your reponse to this request by April 1, 1983. E. Aquifer Rehabilitation. The data that has been generated to date indicate that contaminants from TCAAP sites have reached the Prairie du Chien-Jordan aquifer from which approximately 75 percent of the ground water used in the Twin Cities metropolitan area is pumped. It is likely that both on-base and off-base remedial measures will be required to restore this and other aquifers. We expect the Army to include as • part of its Phase II Study the development of proposals to implement necessary aquifer rehabilitation. Please include a response to this request in your Phase II Study proposal to be submitted by April 1.