§ 11.74.030. Facilities Installed After January 1, 1984.

A.

Minimum Standards. All underground storage tanks installed after January 1, 1984 must, at a minimum, meet the design, construction and monitoring standards of Article 3 of Chapter 16 of Division 3 of Title 23 of the California Code of Regulations and Division 20, Chapter 6.7, of the California Health and Safety Code.

B.

Monitoring Capability. All new underground storage tanks shall be designed and constructed with a monitoring system capable of detecting that the hazardous substance stored in the primary containment has entered the secondary containment. Visual inspection of the primary containment is the preferred method; however, other means of continuous monitoring may be required by the Director. Where secondary containment may be subject to the intrusion of water, a means of monitoring for such water shall be provided. Whenever monitoring devices are provided, they shall, where applicable, be connected to attention-getting visual and/or audible alarms.

C.

Containment Requirements. Primary and secondary levels of containment shall be required for all new underground storage tanks, unless exempted by Division 20, Chapter 6.7, of the California Health and Safety Code.

1.

All primary containment shall be "product tight" within the meaning of Division 20, Chapter 6.7, of the California Health and Safety Code, section 25290.1(a), and compatible with the stored product.

2.

Secondary Containment.

a.

All secondary containment shall be constructed of materials of sufficient thickness, density, and composition so as not to be structurally weakened as a result of contact with released hazardous substances and so as to be capable of containing hazardous substances released from a primary containment for a period of time equal to or longer than the maximum anticipated time sufficient to allow recovery of the released hazardous substance.

b.

In the case of installation with one primary containment, the secondary containment shall be large enough to contain at least one hundred percent (100%) of the volume of the primary containment.

c.

In the case of a facility with multiple primary containments, the secondary containment shall be large enough to contain one hundred fifty percent (150%) of the volume of the largest primary containment placed in it, or ten percent (10%) of the aggregate internal volume of all primary containments in the facility, whichever is greater.

d.

If the facility is open to rainfall, then the secondary containment must be able to additionally accommodate the volume of a twenty-four (24)-hour rainfall as determined by a one-hundred (100)-year storm history.

3.

Laminated, coated, or clad materials shall be considered single-walled and shall not be construed to fulfill the requirements of both primary and secondary containment.

4.

The design and construction of underground storage tanks for motor vehicle fuels installed before January 1, 1997, need not meet the requirements of Section 11.74.030 C1-C3 of this division if all of the conditions of paragraph (7) of subdivision (a) of Section 25291 of Division 20, Chapter 6.7, of the California Health and Safety Code are met.

D.

Spill and Overfill Protection. Means of spill and overfill protection shall be required for any primary containment. This may be an overfill prevention device and/or an attention-getting high level alarm.

E.

Separation of Materials. Materials that in combination may cause fire or explosion, or the production of a flammable, toxic, or poisonous gas, or the deterioration of a primary, or secondary containment shall be separated in both the primary and secondary containment so as to avoid intermixing.

F.

Drainage System. Drainage of precipitation from within a storage facility containing hazardous substances shall be controlled in a manner approved by the director so as to prevent hazardous substances from being released. No drainage system will be approved unless the flow of the drain can be controlled. Disposal of drainage shall comply with the requirements of Title 20, Division 2, of this code.

G.

All underground storage tanks installed on or after July 1, 2004, shall comply with the design, construction, monitoring and maintenance requirements of Division 20, Chapter 6.7, of California Health and Safety Code, section 25290.1.

(Ord. 2015-0016 § 36, 2015: Ord. 97-0016 § 28, 1997: Ord. 83-0208 § 1 (part), 1983: Ord. 83-0206U § 1 (part), 1983.)