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WASTE DISCHARGE REQUIREMENTS FOR -6- KEARNEY-KPF CLOSURE OF SURFACE IMPOUNDMENTS SAN JOAQUIN COUNTY 33. All concentrations of VOCs (1 ,1-DCA, 1,1-DCE, PCE, and 1 ,1 , 1-TCA) detected in soil and sludge samples are greater than their respective background concentrations. OPERATION OF FACILITY 34. Water for domestic and industrial purposes is obtained from the area municipal system. However, historically, the facility obtained water from two supply wells. The shallow supply well is southwest of the office building and the deep supply well is west of the foundry. Use of the supply wells was discontinued in September 1987. 35. The facility operates on a septic system for domestic sewage. There are four septic tanks: two are on the north side of the office building, one is southeast of the foundry, and the other is approximately half way between the foundry and galvanizing building. 36. Industrial waste waters (non-contact cooling water, quench water) are either recycled or are stored on-site in above ground tanks. Spent aqua regia is containerized in 55 gallon polypropylene-lined hazardous waste drums which are disposed of at a permitted off-site disposal facility. Spent Oakite and muriatic acid are pumped directly from tanks in the galvanizing building into hazardous waste tanker trucks which are transported to a permitted off- site disposal facility. Rinse waters from the silver plating and galvanizing process are stored in above ground tanks for eventual disposal at a permitted off-site facility. 37. Approximately 17 percent of solvents used at the facility are collected in 55 gallon drums and within 90 days of accumulation are transported to an off-site permitted disposal facility. The remaining percentage of solvents are consumed or evaporated. 38. Three on-site disposal areas are located in the field in the western portion of the facility. Cuttings, drilling muds, and development and aquifer test waters from the remedial investigation are disposed in separate 100 feet by 100 feet areas from the south to north along the western property boundary of the facility. All wastes from the remedial investigation are stored in above ground tanks, then sampled and analyzed prior to disposal . OTHER APPLICABLE REGULATIONS 39. The facility was notified that it was regulated by the Toxic Pits Cleanup Act in October 1985. The facility submitted a Hydrogeologic Assessment Report (HAR) in July 1986. Ground water contamination by VOCs was first reported in the HAR.