California Code of Regulations › Title 22 - Social Security › Division 4.5 - Environmental Health Standards for the Management of Hazardous Waste › Chapter 15 - Interim Status Standards for Owners and Operators of Hazardous Waste Transfer, Treatment, Storage, and Disposal Facilities › Article 11 - Surface Impoundments › Section 66265.222 - Action Leakage Rate

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
(a)
				  The owner or operator of surface impoundment units subject to section
				  66265.221(a)
				  shall submit a proposed action leakage rate to the Department when submitting
				  the notice required under section
				  66265.221(b). The
				  Department will establish an action leakage rate, either as proposed by the
				  owner or operator or modified using the criteria in this section.
(b) The Department shall approve an action
				  leakage rate for surface impoundment units subject to section
				  66265.221(a). The
				  action leakage rate is the maximum design flow rate that the leak detection
				  system (LDS) can remove without the fluid pressure head on the bottom liner
				  exceeding 1 foot (30.5 cm) at any given portion of the liner. The action
				  leakage rate shall include an adequate safety margin to allow for uncertainties
				  in the design (e.g., slope, hydraulic conductivity, thickness of drainage
				  material), construction, operation, and location of the LDS, waste and leachate
				  characteristics, likelihood and amounts of other sources of liquids in the LDS,
				  and proposed response actions (e.g., the action leakage rate shall consider
				  decreases in the flow capacity of the system over time resulting from siltation
				  and clogging, rib layover and creep of synthetic components of the system,
				  overburden pressures, etc.).
(c) To
				  determine if the action leakage rate has been exceeded, the owner or operator
				  shall convert the weekly or monthly flow rate from the monitoring data obtained
				  under section
				  66265.226(b), to
				  an average daily flow rate (gallons per acre per day) for each sump. Unless the
				  Department approves a different calculation, the average daily flow rate for
				  each sump shall be calculated weekly during the active life and closure period,
				  and if the unit closes in accordance with section
				  66265.228(a)(2),
				  monthly during the post-closure care period when monthly monitoring is required
				  under section
				  66265.226(b).
1. New
					 section filed 5-24-91; operative 7-1-91 (Register 91, No. 22).
2.
					 Repealer and new section filed 7-19-95; operative 8-18-95 (Register 95, No.
					 29).
3. Change without regulatory effect amending subsection (b)
					 filed 6-30-97 pursuant to section
					 100, title 1, California Code of
					 Regulations (Register 97, No. 27).
4. Change without regulatory
					 effect amending NOTE filed 6-7-2004 pursuant to section
					 100, title 1, California Code of
					 Regulations (Register 2004, No. 24).
Note: Authority cited: Sections
						25150
						and
						25159,
						Health and Safety Code; and Governor's Reorganization Plan Number 1 of 1991.
						Reference: Sections
						25159
						and
						25159.5,
						Health and Safety Code; and 40 CFR Section
						265.222.