Iowa Code r. 567-120.12 - Landfarm closure
Unless otherwise required or approved by the department, landfarms shall be closed in one of the following ways:
(1) Three years after the application of PCS,
or
(2) At least six months after the
application of PCS when documentation has been submitted and acknowledged in
writing by the department that each landfarm plot has been tested as follows.
a. One sample from each 10,000 ft2 (e.g.,
100-foot × 100-foot area) of landfarm plot is analyzed pursuant to
subparagraphs 120.6(2)"c"(1), (2), and (3). A minimum of one
sample per landfarm plot shall be obtained. All samples shall be obtained from
between the top 2 to 6 inches of soil.
b. The results of the tests in paragraph
120.12(2)"a" demonstrate that petroleum constituent
concentrations are less than 0.54 mg/kg for benzene, 42 mg/kg for toluene, 15
mg/kg for ethylbenzene, 3800 mg/kg for TEH-diesel and 0.02 mg/kg for
MTBE.
Notes
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