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WASTE DISCHARGE REQUIREMENTS FOR -2- KEARNEY-KPF CLOSURE OF SURFACE IMPOUNDMENTS SAN JOAQUIN COUNTY shown in Attachment "B" which is incorporated herein and made part of this Order. Pond 1 is a circular depression which is 25 feet wide and four feet deep. The depression and a 22 foot dry well are connected by a two inch polyvinyl chloride (PVC) pipe. Pond 2N is approximately 100 feet long and about 50 feet wide. Pond 2S is approximately 100 feet long by 75 feet wide. Both Pond 2N and Pond 2S are part of a swale, are less than three feet deep and are heavily vegetated. 7. The surface impoundments were first operated by the KPF Electric Company beginning 1951. From 1951 to 1973, the facility operated a silver plating process with disposal to the Pond 2N area. In 1973, the operation was expanded to include a galvanizing process with disposal to the drainage area south of the galvanizing building, the dry well and to Pond 1 . Pond 2S was used until November 1987 for disposal of non-contact cooling water from the foundry. The Discharger purchased the facility in June 1984 and wastes continued to be disposed of to land until January 1986 when wastes were stored and transported to a permitted off-site disposal facility or were evaporated. WASTES AND THEIR CLASSIFICATIONS 8. The silver plating process generates two waste streams. The volume of the spent aqua regia (a mixture of nitric, hydrochloric and sulfuric acids) waste stream is about 140 gallons per year (g/yr). The volume of the aqua regia and silver cyanide rinse water waste stream is about 15,000 g/yr. 9. The galvanizing process has three waste streams. The volume of the spent Oakite (a mixture of sodium hydroxide and sodium carbonate) waste stream is about 15,000 g/yr. The volume of the spent muriatic acid (primarily hydrochloric acid) waste stream is about 17,000 g/yr. The volume of the galvanizing rinse water waste stream is about 130,000 g/yr. 10. In the welding and paint shops and in the silver plating process 1 ,1 ,1- trichloroethane (TCA) is used. A maximum of 80 g/yr may have been disposed of on the ground. DESCRIPTION OF THE SITE 11. The facility is in the Delta Subregion of the Central Valley geomorphic province. The facility is approximately three miles east of the San Joaquin River and less than a mile south of the confluence of the Calaveras River and the Stockton Diverting Canal . The topography at the facility is relatively flat with ground surface elevations between 18 and 23 feet mean sea level (msl) . Surface drainage is toward the surface impoundments and toward the western border of the property. A ditch borders the western