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Title 22 Environmental Health Standards—Hazard, -;Waste §66265.193 .,,. 1-11 (D)provided with an impermeable interior coaling or lining that is 2.the hydrogeological characteristics of the facility and surrounding compatible with the waste being transferred.stored or treated and that land. will prevent migration of waste into the concrete: 3.the potential for health risks caused by human exposure to waste (E)provided with ameansto protect against the formation of and igni- constituents. tion of vapors within the vault,if the waste being transferred.stored or 4.the po wntial fordamage to wildlife,crops,vegetation.and physical treated: structures caused by exposure to waste constituents.and 1.meets the definition of ignitable waste under section 66262.21 of 5.the persistence and permanence of the potential adverse effects: this division,or (B)the potential adverse effects of a release on ground—water quality. 2.meets the definition ofreactive waste under sec tion 66261.23 of this taking into account: division and may form an ignitable or explosive vapor.and I.the quantity andqualityofgroundwaterandthedirectionofground— (F) provided with an exterior moisture barrier or he otherwise de- water flown. signed or operated to prevent migration of moisture into the vault if the 2.ire proximity and withdrawal rates of water in the area. vault is subject to hydraulic pressure. 3.the current and future uses of ground water in the area,and (3)Double—walled tanks shall be: 4,the existing quality of ground water.including othersourees of con- (A)designed as an integral structure(i.e..an inner tank within an outer tamination and their cumulative impact on the ground—water quality: shell)so that any release from the inner tank is contained by the outer (C)the potential adverse effects of a release on surface waterquality. shell: taking into account: (B)protected.if constructed of metal.from both corms.ion of the pri- 1.the quantity and quality of grusundwaterand thedirection of ground— mary tank interior and the external surface of the maer shell:and water flown. (C)provided with a built—in.continuous leak detection system capable 2.the patterns of rainfall in the region. of detecting a release within 24 hours or at the earliest practicable time. 3.the proximity of the tank system to surface waters. if the owner or operator can demonstrate to the Department.and the De- 4.the current and future uses of surface waters in the area and any wa- partmentconcurs.that the existing leakdetection technology or site con- ter quality standards established for those surface waters.and ditions will not allow detection of a release within 24 hours. 5.the existing quality of surface water,including othersources of con- (f)Ancillary equipment shall be provided with full secondary contain- (amination and the cumulative impact on surface—water quality:and went(e.g.. trench,jacketing,double—walled piping)that meets the m- (D)the potential adverse effects of a release on the land surrounding quirements of subsections(b)and(c)of this section except for: the tank system.taking into account: (1)aboveground piping(exclusive of flanges,joints,valves,and con- I.the patterns of rainfall in the region,and notions)that are visually inspected for leaks on a daily basis: 2.the current and furore uses of the surrounding land. (2)welded flanges,weldedjoints,and welded connections that are vi- (3)The owner or operator of a tank system.for which a variance from sually inspected for leaks on a daily basis: secondarycontainment has been granted in accordance with the require- (3)sealless or magnetic coupling pumps and sealless valves,that are meats of subsection(gX])of this section,at which a release of hazardous visually inspected for leaks on a daily basis:and waste has occurred from the primary tank system but has not migrated (4)pressurized aboveground piping systems with automatic shut—off beyond the zone of engineering control(as established in the variance). devices(e.g..excess flowcheckvalves.flow meteringshutdown devices. shall: loss of pressure actuated shut—df devices)that are visually inspected for (A)comply with the requirements of section 66265.196,except sub. leaks ort a daily basis, section(e):and (g)The owner or operator may obtain a variance from the require- (B)decontaminate or remove contaminated soil to the extent neces- ments of this section for existing above—ground tanks in place.if the De- nary to: penmen finds,as a result of a demonstration by the owner or operator. 1.enable the tank system.for which the variance was granted,to m- either that alternative design and operating practices,togetherwith to ca- sume operation with the capability for the detection of and response to tioacbamctetistics.will prevent the migration of hazardous waste oxhaz- releases at leastequivalent to the capabilityit had priorto the mime.and ardous constituents into the ground water or surface water at least as ef- 2.prevent the migration of hazardous waste o rhazartiows constituents fectively ac secondary containment during the active life of the tank to ground water or surface water.and system.orthat in the event of a release that does migrate to ground water (C)if contaminated soil cannot be removed ordecontaminated in ac- orsurface water,nosubstantial present or potential hazard will be posed codance with subsection(gX3XB)of this section.comply with the m- to human health or the environment. quitements of section 66265.197(b): (1)In deciding whether to grant a variance based on a demonstration (4) The owner oropentorof a tank system.forwhich a variance from of equivalent protection of ground water and surface water.the Depart- secondary containment has been granted in accordance with the require- ment will consider. ments of subsection(g)(I)of this section.at which a release of hazardous (A)the nature and quantity of the waste: waste has occurred from the primary tank system and has migrated be- (B)the proposed alternate design and operation: yowl the zone of engineering control (as established in the variance). (C)tbe hydrogeologic setting of the facility.includingthe thickness of shall: soils between the tank system and ground water.and (A)cmnplywith the requirements ofsection 66265.196(a).(b).(e),(d) (D)all other factors that would influence the quality and mobility of and(e):and the hazardous constituents and the potential for the constituents to mi- (B)prevent the migration of hazardous waste or hazardous constilu- grate to ground water or surface water. ents to ground water or surface water,if possible,and decontaminate or (2)in deciding whether to grant a variance.based on a demonstration remove contaminated soil. If contaminated soil canna be decontami- of no substantial present or potential hazard,the Department will consid- nated or removed.or if ground water has been contaminated.the owner er. or operator shall comply with the requirements of section 66265.197(6): (A)the potential adverse effects on ground water.surface water.and (C)ifrepairing.replwing.or reinstalling the tank system,provide sec- land quality taking into account: ondary containment in accordance with the requirements of subsections 1.the physical and chemical characteristics of the waste in the tank (a)through(f)of this section or reapply for a variance from secondary system,including its potential for migration. containment and meet the requirements for new tank systems in section Page 758.95 Revs,a.Ne.2e 6-11-4