The following requirements apply to non-integral secondary containment on new tanks -
answer✔1. Must contain 100% of the usable capacity of the primary containment for a single
container
2. Must contain 150% of the largest container or 10% of the aggregate volume for multiple
containers
3. If open to rainfall, must accommodate the amount of rain that could enter the system during a
24hour, 25-year storm in addition to the applicable volume in items 1 or 2 above.
4. If backfill material is placed in the secondary containment system, the system must meet
specific standards [see 2631 (d) (3)]
5. Must be equipped with a collection system to accumulate, store and permit removal of any
liquid within the system.
6. The floor of the system must be sloped to a collection sump and meet other design standards
[see 2631 (d) (5)].
7. If a membrane liner is used (e.g., excavation liner), the design shall meet specific design
standards [seee 2631 (d) (6)]
New underground storage tanks with secondary containment shall be - answer✔designed and
installed so that any loss of hazardous substance from the primary containment will be detected
by an interstitial monitoring device or method.
Owners or operators of new underground storage tanks shall implement a monitoring program
that: - answer✔1. Is approved by the local agency and specified in the operating permit.
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