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Show Kennecott Wastewater Ndrth Faciiity Soils Treatment Plant Removal Action (SSID # STATEMENT OF WORI\ I. SITE HISTORY AND arid Site Ponds 4B) BACKGROUND The Wastewater Treatment Plant (WWTP) is iocated adjacent to the intersection of State Highways 201 (2100 south) and 202, north of the Kennecott Refinery. The WWTP began operations in 1974. It produces a sludge residual which has been discharged Lnt.o five ponds called Ponds A, B, C, C Extension, and D. All of the ponds are, located within 1.5 miles af the WWTP as shown in Figure 1. - , The WWTP treats approximately 3,000 gallons per minute (gpm) of process waters from the Smel ter, Refinery I Utah Copper and Power facilities North Concentrator Plant, in-plant are added to lime the Ferric chloride and/or sewage. A sludge residual from wastewater in the treatment process. the WWTP is produced at a rate of approximately 250 wet tons The composition of the WWTP sluge has changed due per day. to changes in the operation and chemicals used in the waste water treatment process. the Magna t'ailings impoundment is in s i.z'e of which 12.5 acres contains Kennecott used-this unlined pond from August 1974 to s.ludge. It contains approximately. 62,000 wet tons January 1981. Some of the sludge is Pre (52,000 cubic yards) of sludge. lime Noranda and was smelting only and produced with from chloride lime/ferric August 1974 precipitat:ion processes until May 1978. Pond A, located approximately 80 west of acres ' is of the WWTP and the north is of size. The thickness the approximately sludge The pond was originally used from ranges from 15 to 16 feet. 1981 to March 1983. In 1987, the sludge was treated with cement and placed in a landfill located within the tailings Kennecott placed pond B back into service in impoundment. Pond B has not 1988 and filled it to capacity in early 1989. been used since 1989. It contains approximately 145,000 wet tons of (120,8,00 cyds) High-lime Noranda sludge sludge. derived from the high-lime processin operations in early 1983 until operations shut down in 1985. Operations were resumed in 1987 using high-lime processing until mid-1989. Pond B Loczt ed 5.9 to acres in Pond C is appr oxdrna t.e Ly 7. 8 acres in size and is located "about 500 feet southeast: of the WWTP. Kennecott used this pond from March 1983 until April 1989 when it reached capacity. The estimated 282,000 (235,000 cyds) wet tons of sludge ranges in thickness from 17 to 36 feet. 1 |
