CORRESPONDENCE_1959 - 1989 - Laserfiche WebLink

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WASTE CLASSIFICATIONS AND DISPOSAL OPTIONS WASTE Perrygswbb Waste Disposal Classification Option(s) Is it Restricted RESTRICTED NO DISCHARGE QM Hazardous? yes HAZARDOUS TO LAND rw e 3 w ® Is it Hazardous as Must it be O defined in Title 22 7 yes ma Hazaras dous?? yes HAZARDOUS CLASS I no no (given variance) ------- ----------- --------------------------------- Has discharger demonstrated that waste constituents DESIGNATED , Present a lower risk of water quality degradation e ; than indicated by this no m classification? Does it pose a significant , , y" CLASS IB or 1 threat to water quality? , DESIGNATED c3X yes no Does it cartel"a NONHAZARDOUS CLASS 111, II, or 1 significant amount of SOLID o degradable material? yes no INERT UNCLASSIFIED, CLASS III, 11, or I Figure 2 could cause degradation of waters of the State"or The hazardous STLC for arsenic,the level above which "2)hazardous waste which has been granted a variance a Iiquid waste becomes hazardous under Title 22 of from hazardous waste management requirements CCR,is 5 mg/l. Therefore,the waste in this example is pursuant to Section 66310 of Title 22 of this code." The not hazardous. The drinking vater standard for second part of this definition pertains to those wastes arsenic is 0.05 mg/1. If naturz geologic materials granted a variance by DHS from Class I disposal,as between the base of the impoundment and the water discussed above. The first half of the'designated table are unable to sufficiently filter out or attenuate waste'definition includes non-hazardous wastes which arsenic,the drinking water standard will be exceeded could impair water quality if discharged to a waste and the ground water will have become unusable for management unit that provides less than Class II domestic supply. Therefore, this waste at this site containment. 'Designated wastes'are to be discharged would be classified as a'designated waste',and the to Class II waste management units which have impoundment would have to be designed to meet engineered containment features—liners and leachate Class II containment standards to isolate the waste collection systems—which act to isolate the wastes from ground water. from ground and surface waters. The Subchapter 15 regulations,however,do not contain guidance on how THE DESIGNATED LEVEL METHODOLOGY GEM to apply the first part of the'designated waste'defini- tion. The purpose of the Designated Level Methodol- As shown by the above example,the determination of ogy is to provide this guidance. whether a waste poses a threat to water quality must take into account factors relating to the waste and to It may not be immediately apparent how a non- the site of proposed discharge. In the Designated Level hazardous waste could pose a threat to water quality. Methodology,this is accomplished by determining A simple example will illustrate this point. Figure 3 "Designated Levels",concentrations of waste constitu- shows an unlined surface impoundment which con- ents which provide a site-specific indication of the tains soluble arsenic at a concentration of 4.5 mg/1. waste's water quality impairment potential. If meas- Desipated Level Methodology Summary Page 2