1. (a) Underground storage tanks installed on or after July 1, 2026, must bear a marking, code stamp, or label, located within the perimeter of the sump collar, including the following:

   1. (1) Manufacturer identification;
   2. (2) Production location;
   3. (3) Date of manufacture;
   4. (4) Maximum burial depth;
   5. (5) Maximum test pressure in pounds per square inch gauge; and
   6. (6) Openings not equipped with a striker plate (if any).
2. (b) Secondary containment for Type 2 and Type 3 underground storage tanks must be constructed, operated, and maintained to prevent water intrusion. Backfill material must not be added to secondary containment.

Note: Authority cited: Sections 25299.3 and 25299.7, Health and Safety Code. Reference: Sections 25284.1, 25290.1, 25290.2 and 25291, Health and Safety Code; and 40 CFR Sections 280.20, 280.32 and 280.40-280.42.

History

1. Editorial correction of printing errors in Tables 4.1 and 4.2 (Register 86, No. 23).

2. Change without regulatory effect of Table 4.1 (Register 86, No. 40).

3. Repealer and new section filed 8-9-91 as an emergency; operative 8-9-91. Text remains in effect uninterrupted pursuant to Health and Safety Code section 25299.7 (Register 92, No. 14).

4. Editorial correction of printing errors in History 3 (Register 92, No. 43).

5. Amendment filed 4-5-94; operative 5-5-94 (Register 94, No. 14).

6. Amendment of subsection (j) and amendment of Note filed 5-14-2001; operative 5-14-2001 pursuant to Government Code section 11343.4 (Register 2001, No. 20).

7. Amendment of subsections (j) filed 4-8-2004; operative 5-8-2004 (Register 2004, No. 15).

8. Repealer and new section heading and section filed 10-28-2025; operative 1-1-2026 (Register 2025, No. 44).