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Ch. 15,Art. 10-7
<br /> (C)free of cracks or gaps; and
<br /> (D)designed and installed to completely surround the tank and to cover all surrounding earth likely to come
<br /> into contact with the waste if released from the tank(s)(i.e., capable of preventing lateral as well as vertical migration
<br /> of the waste).
<br /> (2)Vault systems shall be:
<br /> (A)designed or operated to contain 100 percent of the capacity of the largest tank within its boundary;
<br /> (B)designed or operated to prevent run-on and infiltration of precipitation into the secondary containment
<br /> system unless the collection system has sufficient excess capacity, in addition to that required in subsection (e)(2)(A)
<br /> of this section,to contain run-on and infiltration. Such additional capacity shall be sufficient to contain run-on and
<br /> infiltration of precipitation from a 25-year, 24-hour rainfall event;
<br /> (C)constructed with chemical-resistant water stops in place at all joints(if any);
<br /> (D)provided with an impermeable interior coating or lining that is compatible with the waste being
<br /> transferred, stored or treated and that will prevent migration of waste into the concrete;
<br /> (E)provided with a means to protect against the formation of and ignition of vapors within the vault, if the
<br /> waste being transferred, stored or treated:
<br /> 1. meets the definition of ignitable waste under section 66262.21 of this division, or
<br /> 2. meets the definition of reactive waste under section 66261.23 of this division and may form an ignitable or
<br /> explosive vapor; and
<br /> (F)provided with an exterior moisture barrier or be otherwise designed or operated to prevent migration of
<br /> moisture into the vault if the vault is subject to hydraulic pressure.
<br /> (3) Double-walled tanks shall be:
<br /> (A)designed as an integral structure(i.e., an inner tank within an outer shell)so that any release from the
<br /> inner tank is contained by the outer shell;
<br /> (B)protected, if constructed of metal,from both corrosion of the primary tank interior and the external
<br /> surface of the outer shell; and
<br /> (C)provided with a built-in, continuous leak detection system capable of detecting a release within 24 hours
<br /> or at the earliest practicable time, if the owner or operator can demonstrate to the Department, and the Department
<br /> concurs,that the existing leak detection technology or site conditions will not allow detection of a release within 24
<br /> hours.
<br /> (f)Ancillary equipment shall be provided with full secondary containment(e.g., trench,jacketing, double-
<br /> walled piping)that meets the requirements of subsections(b)and (c)of this section except for:
<br /> (1)aboveground piping (exclusive of flanges,joints,valves, and connections)that are visually inspected for
<br /> leaks on a daily basis;
<br /> (2)welded flanges, welded joints, and welded connections that are visually inspected for leaks on a daily
<br /> basis;
<br /> (3)sealless or magnetic coupling pumps and sealless valves, that are visually inspected for leaks on a daily
<br /> basis; and
<br /> (4)pressurized aboveground piping systems with automatic shut-off devices(e.g., excess flow check valves,
<br /> flow metering shutdown devices, loss of pressure actuated shut-off devices)that are visually inspected for leaks on a
<br /> daily basis.
<br /> (g)The owner or operator may obtain a variance from the requirements of this section for existing above-
<br /> ground tanks in place, if the Department finds, as a result of a demonstration by the owner or operator, either that
<br /> alternative design and operating practices,together with location characteristics,will prevent the migration of
<br /> hazardous waste or hazardous constituents into the ground water or surface water at least as effectively as
<br /> secondary containment during the active life of the tank system, or that in the event of a release that does migrate to
<br /> ground water or surface water, no substantial present or potential hazard will be posed to human health or the
<br /> environment.
<br /> (1) In deciding whether to grant a variance based on a demonstration of equivalent protection of ground
<br /> water and surface water, the Department will consider:
<br /> (A)the nature and quantity of the waste;
<br /> (B)the proposed alternate design and operation;
<br /> (C)the hydrogeologic setting of the facility, including the thickness of soils between the tank system and
<br /> ground water; and
<br /> (D)all other factors that would influence the quality and mobility of the hazardous constituents and the
<br /> potential for the constituents to migrate to ground water or surface water.
<br /> (2) In deciding whether to grant a variance, based on a demonstration of no substantial present or potential
<br /> hazard, the Department will consider:
<br /> (A)the potential adverse effects on ground water, surface water, and land quality taking into account:
<br /> 1.the physical and chemical characteristics of the waste in the tank system, including its potential for
<br /> migration,
<br /> 2.the hydrogeological characteristics of the facility and surrounding land,
<br /> 3.the potential for health risks caused by human exposure to waste constituents,
<br /> 4.the potential for damage to wildlife, crops, vegetation, and physical structures caused by exposure to
<br /> waste constituents, and
<br /> 5. the persistence and permanence of the potential adverse effects;
<br /> (B)the potential adverse effects of a release on ground-water quality,taking into account:
<br /> Unofficial Title 22©2005 State of California,all rights reserved.May not be commercially reproduced or sold. 6/9/08
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