A. A
generator of excavated soil contaminated with petroleum shall determine whether
the soil is PCS, solid waste PCS, or non-regulated soil. The basis for the
determination shall be maintained for at least three years and shall be made
available to the Department upon request. The generator shall make such
determination using either of the following methods:
1. Testing the soil pursuant to subsection
(B) of this Section. Laboratory analysis of these samples shall be performed by
a laboratory licensed by the Arizona Department of Health Services. Approved
testing methods, which identify concentrations for total recoverable extraction
of contaminants, shall be used.
2.
Application of knowledge of the characteristics of the contaminated soil in
light of the known or potential source of the contamination. The Department may
require sampling to confirm the accuracy of applied knowledge.
B. Sampling of soils contaminated
with petroleum shall be performed in accordance with a site-specific written
sampling plan which is consistent with the requirements set forth in either of
the following:
1. "Test Methods for Evaluating
Solid Waste", EPA SW-846, 3rd Edition Volume II: Field Manual,
Physical/Chemical Method, Chapter Nine (SW-846 Third Edition), 1986,
Environmental Protection Agency, Washington, D.C. and no future editions or
amendments, incorporated herein by reference and on file with the Department
and the Office of the Secretary of State.
2. "Quality Assurance Project Plan", Chapter
9, May 1991 Edition, Arizona Department of Environmental Quality, Phoenix,
Arizona and no future editions or amendments incorporated herein by reference
and on file with the Department and the Office of the Secretary of State.
C.
Where multiple samples arc collected from a
stockpile of contaminated soil generated from a single source, the stockpile
shall be considered as PCS if the arithmetic mean of the TPH concentrations of
the samples exceeds 5,000 mg/kg. A sample having a concentration of total
petroleum hydrocarbons which is below the analytical method detection limit or
reporting limit shall be assigned a concentration which is 1/2 of the reported
analytical method detection limit or reporting limit.
D.
C. If soil excavated during the initial investigation
of a site to determine the extent of contamination is PCS, the PCS may be
returned into the excavation site from which the soil was removed if all of the
following conditions are met:
1. There is no
freestanding liquid within the excavation, unless the State Fire Marshal or
other jurisdictional fire authority directs otherwise, and the requirements of
subsections (2) and (3) of this subsection are met.
2. The owner or operator provides
notification to the Department that the PCS has been returned to the excavation
within 14 days after the return of the PCS to the excavation.
3. The owner or operator completes a site
characterization within 120 days and implements remediation within 150 days
after the date the site characterization began.
