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Timeline of PGRS and City water supply capacity issues • July 1981 Minnesota Department of Health notifies the City of New Brighton of Tetrachloride (TCE) contamination in its water supply. New Brighton implements water use restrictions, uses least contaminated wells, decides to construct deep wells below the contamination and searches for source of the contamination. July 1984 The City files lawsuit against the United States Army and other defendants manufacturing at Twin Cities Army Ammunition Plant (TCAAP) including Honeywell. Alliant Techsystems Inc. eventually buys out Honeywell. Both the US Army and Honeywell are found to be the source of the TCE groundwater contamination. June 1986 Environmental Protection Agency (EPA) agrees with New Brighton in its need for additional water supply which still has restrictions on use. EPA issues a Record of Decision approving the construction of Well 13 as a deep well. The federal government would pay for this new well with su erfund site money. March 1987 US Army issues counterproposal to City request for additional water supply capacity. US Army proposes cash for past and future damages with existing deep wells. They also propose to build a Granular Activated Carbon Treatment Plant to treat contamination in the shallow Prairie du Chien and Jordan wells in lieu of additional Mt. Simon/Hinckley deep wells. June 1988 Temporary Granular Activated Carbon (TGAC) becomes operational. TGAC consist of a temporary GAC treatment plant and Wells 5 and 6. Design begins for the Permanent Granular Activated Carbon (PGAC) water treatment plant which becomes Water Treatment Plant # 1. 1988 and 1989 Twin Cities metropolitan area experiences severe drought conditions. The City of New Brighton issues watering bans and knocks on doors to tell residents to turn off their water. December 1988 EPA reverses its prior approval of building a new Well 13 stating that water supply capacity is not required for protection of public health. January 1989 In response to EPA reversing its prior approval of Well 13 the City of New Brighton provides the US Army with a study supporting its assertion that water supply capacity of PGAC Water Treatment Plant 41 and deep wells is inadequate and less than the pre- contamination supply. July 1990 The City of New Brighton and Alliant Techsystems Inc. meet for the first time to discuss building Well 13 as potable supply. Alliant Techsystems Inc. was negotiating with EPA and US Army for what was Honeywell's share of responsibility of the TCE groundwater contamination. November 1990 Wells 3 and 4 are operational and added to PGAC Water Treatment Plant #1. September 1992 EPA and US Army execute a Record of Decision (ROD) for operable unit 3 (OU3). The ROD establishes location of OU3 as the "south plume", clarifies that a new Plume Groundwater Recovery System (PGRS) consist of a new Well 13 and Water Treatment Plant 42 will be the rerned for OU3 and supply potable water to the CL of New Brighton. October 1992 City of New Brighton enters into design-phase agreement with Alliant Techsystems Inc. for the PGRS. PGRS design meets both containment rerned and water supply capacity issues. April 30, 1993 City of New Brighton and Alliant Techsystems Inc. accept "Agreement between the City of New Brighton and Alliant Techsystems .inc. for the Operation, Maintenance and Repair of the PGRS" PGRS agreement. September 1993 EPA and UA Army execute ROD for operable unit 1 "North Plume". ROD calls for the New Brighton Contaminated Groundwater Recovery System (NBCGRS) to replace the PGAC Water Treatment Plant # 1. NBCGRS is to have iron and manganese removal system, Fridley Interconnection for excess water flows, and new Wells 14 and 15 to contain the groundwater plume. Ma 1994 PGRS, Well 13 becomes operational. 1996 NBCGRS becomes operational in May with Well 14 added in December 1996 and Well 15 added in March 1998. I:\COLTNC1L\REPORTS\2007\Pnginaering\Close PGRS fund 207.doe