Ariz. Admin. Code § R18-12-262 - LUST Site Investigation

A. Requirement to investigate. The owner or operator shall investigate a release at and from a LUST site to determine the full extent of the release of regulated substances and shall:

1. Determine the full extent of contamination;

2. Identify physical, natural, and artificial features at or surrounding the LUST site that are current or potential pathways for contamination migration;

3. Identify current or potential receptors; and

4. Obtain any additional data necessary to determine site-specific corrective action standards and to justify the selection of remedial alternatives to be used in responses to contaminated soil, surface water, and groundwater.

B. Completion of investigation activities. The owner or operator shall complete the investigation activities described in subsection (A) and submit the report described in subsection (D) within a time established by the Department.

C. Determining the full extent of contamination. The owner or operator shall determine, within each contaminated medium, the full extent, location, and distribution of concentrations of each chemical of concern stored in the UST over its operational life. The full extent of contamination shall be determined upon receipt of laboratory analytical results delineating the vertical and lateral extent of the contamination.

D. LUST site characterization report. The owner or operator shall submit a report of the information developed during the investigation required in subsection (A), in a format acceptable to the Department. The report shall be submitted within the time established in subsection (B). The report submitted under this subsection shall contain the following minimum information:

1. A site history summary;

2. Information on bedrock, if encountered during the investigation;

3. The hydrologic characteristics and uses of groundwater and surface water of the local area;

4. A concise description of factors considered in determining the full extent of contamination;

5. A concise summary of the results of the investigation including a conceptual site model;

6. A site vicinity map, site location map and a site plan;

7. A tabulation of all field screening and laboratory analytical results and water level data acquired during the investigation;

8. Laboratory sample analytical and associated quality assurance and quality control reports and chain-of-custody forms;

9. A tabulation of all wells registered with the Arizona Department of Water Resources, and other wells located within one-quarter mile of the facility property boundary;

10. The lithologic logs for all subsurface investigations; and

11. The as-built construction diagram of each well installed as part of this investigation.

E. Conditions for approval of the site characterization report. The Department shall approve the site characterization report if the Department determines it meets the requirements of this Section and A.R.S. § 49-1005, and contains the information required by subsection (D), or if the Department has enough information to make an informed decision to approve the report.

F. Notice of decision. The Department shall determine if the conditions in subsection (E) are or are not satisfied and either approve or not approve the report and notify the owner or operator in writing. The notification shall include any conditions on which the approval or non-approval is based and an explanation of the process for resolving disagreements under A.R.S. § 49-1091.

Notes

Ariz. Admin. Code § R18-12-262

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.