Twin Cities Army Ammunition Plant
Special Well and Boring Construction Area
In 1996, the Minnesota Department of Health (MDH) designated a Special Well and Boring Construction Area (Well Advisory) incorporating the Cities of New Brighton, St. Anthony and portions of Arden Hills, Columbia Heights, Falcon Heights, Fridley, Lauderdale, Minneapolis, Roseville, and Shoreview, which are located in Anoka, Hennepin, and Ramsey Counties. The Special Well and Boring Construction Area incorporated two areas of groundwater contamination related to volatile organic chemicals (VOCs) contamination at, and around the Twin Cities Army Ammunition Plant (TCAAP) in Arden Hills. The largest area of contamination extends several miles to the south and west of TCAAP, to depths of several hundred feet. Portions of the buried sand aquifer (Hillside Sand formation) and the Prairie du Chien dolomite and Jordan sandstone bedrock formations have been contaminated with VOCs, principally trichloroethene (TCE). A second, much smaller area of VOC contamination exists in the surficial sand deposits (Fridley formation) north and west of TCAAP to depths of approximately 45 feet.
In June 1999, the Minnesota Pollution Control Agency requested that the MDH extend the Special Well and Boring Construction Area boundary for the larger contamination plume farther to the southwest to the Mississippi River in Minneapolis, and Marshall Avenue in St. Paul. The eastern boundary of the extension area is Cleveland Avenue, between Larpenteur Avenue on the north and Marshall Avenue on the south. The western boundary of the extension area is a continuation of Central Avenue to the Mississippi River. The boundaries of the original area north of Larpenteur Avenue and Hennepin Avenue remain unchanged. The revised boundaries of the Special Well and Boring Construction Area are shown on the accompanying map (PDF: 106KB/1 page).
Wells within the Special Well and Boring Construction Area may not be constructed or modified until after the MDH has reviewed and approved plans for the proposed activity. Wells completed in or below the Prairie du Chien dolomite may not be sealed until after the MDH has reviewed and approved plans. Plans for well construction, well reconstruction, or well sealing may be submitted to Patrick Sarafolean, 651-201-3962, at our metro district office in St.Paul.
Return to > Special Well and Boring Construction AreasQuestions?
Contact the MDH Well Management Section
651-201-4600 or 800-383-9808
Minnesota Department of Health