Issue 3 - the Montana Secretary of State Website

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2 Chemical Abstract Service registry number. Where "Total" is entered, all
species in the ground water that contain this element are included
NEW RULE XLI (17.50.1307) ASSESSMENT MONITORING PROGRAM
(1) and (2) remain as proposed.
(3) The department may specify, and an owner or operator shall comply with,
an appropriate alternate frequency for repeated sampling and analysis of the
constituents in Appendix II to 40 CFR Part 258 (July 1, 2008) required by (2), during
the active life of the unit, including and closure and post-closure care periods of the
unit, considering the following factors:
(a) through (f) remain as proposed.
(4) After obtaining the results from the initial or subsequent sampling events
required in (2), the owner or operator shall:
(a) remains as proposed.
(b) within 90 days, and on at least a semiannual basis thereafter, resample
all wells described in ARM 17.50.1304(1), conduct analyses for all constituents in
Appendix I to 40 CFR Part 258 (July 1, 2008) or in the alternative list of parameters
established in accordance with ARM 17.50.1306(3), and for those constituents in
Appendix II to 40 CFR Part 258 (July 1, 2008) that are detected by monitoring
required by (2), and record their concentrations in the facility operating record. At
least one sample from each background and downgradient well must be collected
and analyzed during these sampling events. If specified by the department, the
owner or operator shall conduct sampling and analyses under this subsection at an
alternative frequency during the active life of the unit, including and closure and the
post-closure care periods of the unit. The alternative frequency may be no less
frequent than annual during the active life of the unit, including closure. The
alternative frequency must be based on consideration of the factors specified in (3);
(c) through (9)(d) remain as proposed.
(10) In proposing a ground water quality standard under (9), the department
shall consider the following:
(a) and (b) remain as proposed.
(c) other site-specific exposure or potential exposure to ground water.
Appendix II to 40 CFR Part 258 (July 1, 2008)
List of Hazardous Inorganic and Organic Constituents
Common name 1 CAS RN 2 name 3
Chemical abstracts service index
Acenaphthene 83-32-9 Acenaphthylene, 1,2-dihydro-
Acenaphthylene 208-96-8 Acenaphthylene
Acetone 67-64-1 2-Propanone
Acetonitrile; Methyl cyanide 75-05-8 Acetonitrile
Acetophenone 98-86-2 Ethanone, 1-phenyl-
2-Acetylaminofluorene; 2-AAF 53-96-3
Acetamide, N-9H-fluoren-2-yl-
3-2/11/10 Montana Administrative Register