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Washington Accumulation Time: What you need to know

Governing Law and Regulations

Large quantity generators (LQGs): Washington Administrative Code (WAC) 173-303-200(1)

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Medium quantity generators (MQGs): WAC 173-303-201 and WAC 173-303-202

Small quantity generators (SQGs): WAC 173-303-070(8)

Regulatory Agency

Washington Department of Ecology (WDOE) Hazardous Waste and Toxics Reduction Program

See ADDRESSES & CONTACTS for addresses and telephone numbers.

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. Washington has adopted the federal accumulation time rule, which allows large quantity generators (LQGs) to accumulate hazardous waste for up to 90 days without a permit. However, Washington's rules for its other generators are different from the federal, in part because the state does not use the federal definitions of small quantity generators (SQGs) and conditionally exempt small quantity generators (CESQGs). The period of time during which a Washington generator may accumulate hazardous waste on-site without a permit depends on the "status" of the generator. Generator status is based both on the generator classification appropriate to the generator's activities and on whether the generator's production or accumulation of a specific waste is less than or greater than the "quantity exclusion limit" (QEL) assigned by the Washington Department of Ecology (WDOE) to that waste. Unique to Washington, a QEL is the quantity, by weight, at which a waste becomes regulated under medium quantity generator (MQG) or LQG requirements. In addition to these differences, any MQG in Washington that wishes to extend its accumulation period beyond 180 days may do so only with WDOE's approval.

Note: See the state section GENERATORS


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State Requirements

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Washington Accumulation Time Resources

Accumulation Time Products

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This special report will explain the federal container management rules applicable to both TSDF owners and operators storing hazardous waste in containers and to generators accumulating hazardous waste on-site in containers. The report will address how to determine if a container is empty, the applicability of the air emissions control standards, and satellite accumulation by generators. "
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