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6.5 PROJECTION OF PRETREATMENT AND NEW WASTES <br /> Some industries treat their hazardous waste on site, usually through a <br /> neutralization process, discharging the resultant solution into the <br /> sewer. Sewage pretreatment may involve installation of equipment <br /> which concentrates the hazardous waste into a residual sludge. With <br /> recent changes in the federal Clean Water Act and escalating costs for <br /> hazardous waste management, more companies are expected to engage in <br /> this form of sewage pretreatment. <br /> The amount of pretreatment sludge currently generated in the County <br /> cannot be readily obtained from manifest data. To project pre- <br /> treatment sludge generation a survey of the seven publicly owned <br /> treatment works in the County was undertaken. Although the survey <br /> yielded no quantitative data, it did provide information concerning <br /> the degree of compliance of participating industries. Table 6-5 <br /> summarizes this information in Footnotes 1 and 2. <br /> Table 6-5 also presents available data on other projected new wastes. <br /> 6.6 TOTAL HAZARDOUS WASTE GENERATION PROJECTIONS <br /> Table 6-6 summarizes the hazardous waste generation in the County for <br /> the year 2000. Summing the projections for small and large quantity <br /> industrial wastes, residential wastes, cleanup wastes, and anticipated <br /> new wastes results in an estimated 20,482 tons of hazardous wastes <br /> projected to be generated in the County in the year 2000. <br /> 6.7 PROJECTIONS ASSUMING WASTE MINIMIZATION <br /> In accordance with DHS guidelines, this section of the C <br /> HWMP summariz- <br /> es hazardous waste generation projection based on waste minimization <br /> practices. To assist counties in developing waste minimization <br /> estimates, DHS made available the "Hazardous Waste Minimization <br /> PJ9 9390502D.00D 6-5 Rev. 1 11/08/88 <br /> i <br />