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streams. Regional/city agencies also regulate sewer discharges. Only about a quarter of the small quantity generators managing waste on-site recycle their wastes, as compared to two thirds of those shipping their waste off-site. About 20 percent of the SQGs practicing on-site manage- ment treat their waste. Roughly 10 percent of all small quantity generators currently store their waste for more than 180 days prior to disposal , while approximately 20 percent store their _ waste 90 to 180 days. 5.3 DESIGNATED WASTES _ Certain types of wastes may be disposed of in Class II landfills if _ these wastes satisfy criteria described in Title 23 of the California Code of Regulations. Class II landfills are those permitted to accept "designated" wastes. However, because there are few Class II disposal facilities permitted under the revised Title 23, Subchapter 15 requirements in California, these wastes are typically disposed of in Class I landfills. DHS manifest information was reviewed to evaluate the potential volume of these wastes. California waste categories that could potentially be disposed of in _ Class II facilities are asbestos-containing waste, pharmaceutical waste, sewage sludge, paper sludge/pulp, drilling mud, chemical toilet waste, detergent and soap, fly ash, bottom ash, retort ash, gas scrub- ber waste, baghouse waste, and auto shredder waste. The County generated 257.7 tons of manifested asbestos-containing waste in 1986 and 37. 1 tons of pharmaceutical wastes in the same year. Detergent and soap wastes made up about 0.5 tons of wastes manifested in the County in 1986. None of the other designated waste categories _ appeared in the 1986 DHS manifest data. It is possible that a portion of these wastes could have been disposed of in a Class II landfill , thus avoiding use of hazardous waste facility capacity for these designated wastes. PJ9 9390502D.00D 5-11 Rev. 1 11/08/88