(a) Each dam shall have a cutoff trench. The cutoff trench shall meet all of the following requirements:
- (1) Have side slopes no steeper than one horizontal unit to one vertical unit;
- (2) have a bottom width of 10 or more feet as necessary to meet the compaction requirements of K.A.R. 5-40-44;
- (3) be constructed to the depth justified in the design report based on the findings in the geotechnical report, unless observations by the inspecting engineer during construction justify a different depth;
- (4) be backfilled with the most impervious material available at the site. If no impervious material is available at the site, then this material shall be procured off-site;
- (5) be backfilled with material that is contiguous to and homogeneous with the most impervious zone within the dam, if the dam is designed as a zoned fill;
- (6) be constructed in lifts that shall not exceed nine inches for each lift; and
- (7) be constructed of a material that has been brought to acceptable moisture content.
- (b) The material placed in the cutoff trench shall be placed according to the same specifications as those required for the embankment in K.A.R. 5-40-44.
(Authorized by and implementing K.S.A. 2006 Supp. 82a-303a; effective May 18, 2007.)