Colorado Code § 25-7-211

Visibility impairment attribution studies
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(1) Any visibility impairment
reasonable attribution study pertaining to class I areas shall be subject to balanced peer review
by a panel including scientists with appropriate expertise who do not have any substantive
involvement with any party, shall be site-specific with respect to any suspected source of
impairment and to any impacted area, shall be conducted under the oversight of the division,
including, but not limited to, determination of deadlines for such study, and shall utilize study
design and data collection and analytical techniques, including, but not limited to,
contemporaneous ambient air quality, visibility, and meteorological sampling that allows
correlation of the data relevant to any such study. With the exception of emissions from
agricultural, horticultural, or floricultural activities that are exempted under section 25-7-109 (8),
relevant data shall include a reasonable assessment of the contributions of emissions from
reasonably identifiable sources, including natural sources, within the state and region. Any
remedy selection must include relevant economic impact data. In order to minimize delay in the
process, the study shall proceed as expeditiously as sound science will allow. The cost of any
such study shall not be required to be paid by the department of public health and environment.
(2) Nothing in subsection (1) of this section, as amended by House Bill 05-1180, as
enacted at the first regular session of the sixty-fifth general assembly, shall be construed as
changing the property tax classification of property owned by a horticultural or floricultural
operation.

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