Iowa Admin. Code r. 567-114.18 - Evaluation of hydrogeologic conditions
(1) Based on soil boring and other available
information, a description of the site geology shall be made. This description
shall include preparation of geologic cross sections of sufficient number and
spacing (no fewer than four at every site) to adequately define all areas of
the site and of sufficient detail to adequately depict major stratigraphic and
structural trends and reflect geologic structural features in relation to
groundwater flow. Each pair of cross sections must be as near to perpendicular
as possible to adequately portray the site geology.
(2) A description of the hydrogeologic
unit(s) within the saturated zone shall be made including thickness; depth;
hydraulic properties, such as transmissivity and storage coefficient or
specific yield; description of the role of each as confining bed, aquifer, or
perched saturated zone and its actual or potential use as a water supply
aquifer.
(3) All groundwater flow
paths from the site shall be identified, including both horizontal and vertical
components of flow. A contour map of the water table shall be presented showing
horizontal flow paths. A potentiometric surface map of the uppermost aquifer
showing horizontal flow paths shall also be presented, if different from the
water table. Vertical flow paths shall be shown in at least two profiles
approximately parallel to the direction of horizontal flow. Vertical flow paths
shall be determined by water level measurements from clustered wells at
different depths, if possible. An evaluation of vertical groundwater flow based
on the hydrologic properties of the various strata encountered at the site,
estimated groundwater flow and recharge rates, and known information on
hydraulic head shall also be made.
(4) The seasonal, temporal and artificially
induced variations in groundwater flow shall be evaluated. Temporal variations
occur due to natural events, such as rainfall. The addition of tile lines,
removal of overburden, or deposition of wastes would constitute artificially
induced variations.
(5) Surface
water flow paths from the site shall be identified on topographic contour
maps.
Notes
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