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high sanitary flows to the storm sewer system have since been abandoned. In 1994, the main pumping station and parallel force mains were abandoned. A new grinder pump and gravity trunk main were installed from the old main pumping station northwesterly to the intersection of Couoty Road H and U.S. Highway 10 in Mouods View. There the sanitary flow passes into a trunk main owned by the City ofMouods View. The trunk main carries the flow about a quarter-mile to a pumping station owned by Metropolitan Couocil Environmental Services (MCES), from which it is carried by regional facilities to the MCES Plant (Figure 6). All of TCAAP is served by the new trunk main into Mouods View except the United States Anny Reserve Center located in the southeast comer of the site. The USARC is served by the City of Arden Hills. The State of Minnesota Driver's Training Center, located in the northwest comer of TCAAP, is served by a lift station and force main system that pwnps south into TCAAP's sewers. According to the MCES, the new gravity trunk main was sized large enough to handle future flows from TCAAP. The MCES's lift station and force main in Mouods View also have adequate capacity to handle future flows. However, MCES has indicated that the trunk main owned by Mounds View, which couoects TCAAP and the MCES lift station, is uodersized and cauoot support future flows. The MCES bas also indicated that this trunk main may be taken over by the MCES in the future and upgraded to an interceptor so that it can handle future flows from TCAAP. MCES records show that the entire TCAAP site lies within the Metropolitan Urban Service Area. 3. Water Systems Potable Water System The original potable water system was built in the early 1940s and was supplied by wells located east of Building 101. Over a period of time, three wells were dug in this area. An elevated water storage tank was constructed east of the wells on the side of the hill. The tank appears to be constructed of steel with an approximate storage capacity of 250,000 gallons. The original distribution network connecting the wells and tank to the buildings was probably constructed of cast iron pipe or a non-metallic substitute. As more buildings were built and the TCAAP site continued to expand to the north and east, more water storage was needed. Sometime during the 1950s or 1960s a second storage facility was constructed. This is the 1,000,000-gallon grouod storage reservoir located northeast of the elevated tank on top of the hill. The sides of the reservoir are partially earth-bermed, and the structure has a roof. During roughly the same period, water treatment facilities and fIre suppression facilities were added. Most of the fire suppression mains and hydrants were connected to raw water lines. Where raw water lines were not close by, potable water was used. Today, two of the three wells still appear to be in service. In addition, both storage facilities are being used. The elevated tank is used to store raw water for the fIre suppression system. The reservoir is used to store potable water. The distribution piping ranges in size from 6 inches to 16 inches in diameter (Figure 6). Boundary Groundwater Recovery System In 1987, the Army installed a Boundary Groundwater Recovery System (BGRS)to clean up the groundwater its activities bad contaminated in and arouod the TCAAP site. The BGRS consists of 24 wells (Figure 6). Sixteen wells are located in the southwest comer of the site and pwnp raw groundwater to treatment facilities located in Building Camiros. Ltd./SEH, Inc./LHDL, Ltd. TCAAP Framework Plan Page 7 Chapter II . .- . . . . . . . .. . . . . . . .. . .