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r A g ATTACHMENT 3 SOME DEFINITIONS FROM THE TPCA Discharge: Discharge means to place, to dispose of, or to store liquid hazardous wastes or hazardous wastes containing free liquids into a surface impoundment (Section 25208 .2 (f) . Cease the Dischaj e: For the purpose of TPCA, discharge to an impoundment is considered to have ceased (or no person shall be considered to be discharging) if: 1. All introduction of hazardous waste into the impoundment has ceased. 2 . All liquid wastes and all hazardous waste (including sediment and sludge) containing free liquid is removed from the impoundment. 3 . Any remaining hazardous waste sediment and sludge is prevented from saturation with liquid. (Note: this condition is best achieved by removal of all hazardous waste from the impoundment. ) 4. Any liquid (including rainfall) is prevented from entering the pond excavation if underlying soil contains hazardous waste. Close the Impoundment: In addition to ceasing the discharge (see above) , "close the impoundment" includes "any operations necessary to prepare that waste management unit for postclosure maintenance which are conducted pursuant to the federal Resource Conservation and Recovery Act of 1976 [RCRA] (42 U.S.C. Sec. 6901 et seg. ) , and the regulations adopted by the state board and the department [DHS] concerning the closure of surface impoundments" . The closure regulations administered by the state board are contained in Subchapter 15 (commencing with Section 2580) , Chapter 3 , Title 23 of the California Administrative Code (CAC) . The closure regulations administered by DHS (Department of Health Services) are contained in Chapter 30 (commencing with Section 67210) , Division 4, Title 22 of the CAC. Essentially, these regulations permit two types of final closure: one, clean closure [reference Section 67288 (a) of Title 22] and two, closure where waste remains in subsoil [reference Section 67288 (b) of Title 22] .