Frequent Questions

What is a treatability group? What is the difference between the wastewater and nonwastewater treatability groups for LDR treatment standards?

Treatability groups are broad classifications of waste for which different treatment standards apply. They include wastewaters, nonwastewaters, and soil (Land Disposal Restrictions: Summary of Requirements, August 2001 (EPA530-R-01-007)). Since the physical and chemical composition of a waste significantly impacts the effectiveness of a given treatment technology, LDR treatment standards are generally presented as applicable to wastewaters or to nonwastewaters (53 FR 31138, 31145; August 17, 1988). 

EPA defines the wastewater and nonwastewater categories based on the percentages of total organic carbon (TOC) and total suspended solids (TSS) present in a waste. Wastewaters contain less than one percent by weight TOC and less than one percent by weight TSS (§268.2(f)). Nonwastewaters include wastes that do not meet the criteria for wastewaters identified in §268.2(f) (§268.2(d)). Contaminated soils are another treatability group with specifically tailored LDR treatment standards (63 FR 28566, 28602; (May 26, 1998)). Soil is defined in §268.2(k). 

Additional guidance on treatability groups is available in the following documents: 

Monthly Call Center Report Question; May 2000 (RCRA Online #14448
Memo, Berlow to Day; March 25, 1997 (RCRA Online #14214
Memo, Berlow to Day; March 21, 1996 (RCRA Online #14207

These documents are available at the following URL: 
https://yosemite.epa.gov/osw/rcra.nsf/how+to+use?OpenForm

The document Land Disposal Restrictions: Summary of Requirements, August 2001 (EPA530-R-01-007) is available at the following URL: www.epa.gov/sites/production/files/documents/ldisressumm-rpt.pdf (PDF File, 904 KB)

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