Section 327IAC8-4.1-7. Delineation

   (a) If a CPWSS delineates the WHPA using a model, a report with a narrative description of the regional hydrogeologic setting, the conceptual model, and modeling efforts must be submitted. The report must include the following:

(1) Analysis of hydrogeologic setting and the conceptual model including the following:

(A) Map of the area of interest.

(B) Review of published hydrogeologic and geologic interpretations over the area of interest.

(C) Geologic cross sections showing the following:

(i) Hydrostratigraphic units.

(ii) Water levels.

(iii) Relationship of surface water bodies to the hydrostratigraphic units.

(iv) Pumping wells with screened intervals.

(D) Well logs and records used in cross section development. If the number of well logs used in cross section development is greater than fifty (50), the maximum number of well logs submitted to represent the cross section(s) may be negotiated with the department.

(E) A map that illustrates over the area of interest the following:

(i) Location of CPWSS wells.

(ii) Location of high capacity wells registered as significant water withdrawal facilities as defined in IC 14-25-7.

(iii) Surface water features.

(iv) Thickness and extent of hydrostratigraphic units.

(v) Regional water levels.

(vi) Bedrock topography.

(F) Summary of raw data used in the development of the conceptual model.

(G) Discussion of hydrogeologic parameters.

(H) Discussion of the ground water flow system, including the following:

(i) Distribution of recharge.

(ii) Current CPWSS pumping rates and planned changes in pumping rates.

(iii) Pumping rates of neighboring high capacity wells.

(2) Presentation and discussion of the modeling effort must include the following:

(A) The rationale for delineation method selection.

(B) A tabulated summary of the model input parameters showing the range over which the parameters were varied.

(C) An example input file.

(D) A map showing the following:

(i) The domain of the modeled area within the area of interest.

(ii) Location of any boundary conditions used.

(iii) Calibration target locations if used.

(iv) Modeled potentiometric surfaces.

(v) Resultant WHPA boundaries.

(E) Discussion of the following:

(i) Assumptions used in the modeling effort.

(ii) Changes made to initial conditions.

(iii) Calibration analysis if used.

(iv) Water budget of the model if available.

(v) Effects of uncertainty in input parameters and boundary conditions on modeled WHPA boundaries.

  (b) A CPWSS that, after approval from the department, delineates the WHPA using the fixed radius method must submit the following data to the department:

(1) A map depicting the following:

(A) The wellhead protection area boundary.

(B) The CPWSS pumping well locations.

(C) The location of wells in the area registered as significant water withdrawal facilities as defined in IC 14-25-7.

(2) A topographic map of the area.

(3) Well logs for the CPWSS pumping well.

  (c) A CPWSS that delineates the WHPA using the hydrogeologic mapping method must submit data as set out in the "Guidelines for Delineation of Wellhead Protection Areas"* and agreed to by the department and the CPWSS.

  *"Guidelines for Delineation of Wellhead Protection Areas", United States Environmental Protection Agency, Office of Ground Water Protection, Washington, D.C. 20460, June 1987, EPA Publication No. 440/5-93-001. Copies of "Guidelines for Delineation of Wellhead Protection Areas" are available at the Indiana Department of Environmental Management, Office of Water Quality, Drinking Water Branch, Ground Water Section, 100 North Senate Avenue, Room N1255, Indianapolis, Indiana 46204. (Water Pollution Control Division; 327 IAC 8-4.1-7; filed Feb 28, 1997, 4:18 p.m.: 20 IR 1725; errata filed Jun 25, 1997, 3:55 p.m.: 20 IR 3016; readopted filed Jan 10, 2001, 3:23 p.m.: 24 IR 1518; errata filed Feb 6, 2006, 11:15 a.m.: 29 IR 1938; readopted filed Nov 21, 2007, 1:16 p.m.: 20071219-IR-327070553BFA; readopted filed Jul 29, 2013, 9:21 a.m.: 20130828-IR-327130176BFA)