Ariz. Admin. Code § R18-12-261 - Initial Response, Abatement, and Site Characterization

A. 24 hour initial response. An owner or operator shall begin response actions within 24 hours of the release confirmation date to prevent any further release, and identify and mitigate fire, explosion, and vapor hazards.

B. 60 day initial abatement. An owner or operator shall begin the following initial abatement measures as soon as practicable, but not later than 60 calendar days of the release confirmation date:

1. Removal of as much of the regulated substance from the UST system as is necessary to prevent a further release;

2. Visually inspect for and mitigate further migration of any aboveground and exposed belowground release into surrounding soils and surface water;

3. Continue to monitor and mitigate any fire and safety hazards posed by vapors or free product; and

4. Investigate for the possible presence of free product and, if found, initiate the requirements of R18-12-261.02.

C. Initial site characterization required. An owner or operator shall develop, from readily available sources, initial site characterization information on site-specific geology, hydrology, receptors, potential sources of the contamination, artificial pathways for contaminant migration, and occupancies of the facility and surrounding area. Information on any discovered free product shall be gathered and a site check, meeting the requirements of R18-12-251(C)(3), shall be performed, unless conducted as part of the investigation of a suspected release.

D. 90 day report. An owner or operator shall submit an initial site characterization report to the Department, on a Department provided form, within 90 calendar days after the release confirmation date. The report shall include the:

1. Nature of the release, the regulated substance released, and the estimated quantity of the release;

2. The estimated time period when the release occurred;

3. Initial response and abatement actions described in subsections (A) and (B), and any corrective actions taken as of the date of the submission;

4. Estimated or known site-specific lithology, depth to bedrock, and groundwater depth, flow direction, and quality. The date and source of the information shall be included;

5. Location, use, and identification of all wells registered with Arizona Department of Water Resources, and other wells on and within one-quarter mile of the facility;

6. Location and type of receptors, other than wells, on and within one-quarter mile of the facility;

7. Current occupancy and use of the facility and properties immediately adjacent to the facility;

8. Data on known sewer and utility lines, basements, and other artificial subsurface structures on and immediately adjacent to the facility;

9. Copies of any report of any tightness test meeting the requirements under R18-12-243(C) or R18-12-244(B), performed during the investigation of the suspected release;

10. Laboratory analytical results of samples analyzed and received as of the date of the report;

11. Site plan showing the location of the facility property boundaries, release, sample collections for samples with laboratory analytical results submitted with the report, and identified receptors;

12. Current LUST site classification form described in R18-12-261.01(E);

13. Information on any free product discovered under R18-12-261.02; and

14. Results of any site check required under subsection (C).

Notes

Ariz. Admin. Code § R18-12-261

New Section made by final rulemaking at 8 A.A.R. 3894, effective August 20, 2002 (Supp. 02-3). Amended by final rulemaking at 25 A.A.R. 3123, effective 1/1/2020.