The site investigation report shall include a description of the geology and hydrogeology of the site including:

1. (a) Groundwater potentiometric surface(s), hydraulic gradients, flow direction, hydraulic conductivity, and seepage velocity;
2. (b) Soil types, distribution, and permeability;
3. (c) When encountered and drilled, bedrock type and characteristics, including depths and contours;

4. (d) Geologic cross-sections to describe the geology and hydrogeology of the site including the following:

   1. (1) One cross-section parallel to groundwater flow and one cross-section perpendicular to groundwater flow;
   2. (2) The horizontal and vertical scale of each cross-section;
   3. (3) Approximate ground surface elevations and inferred elevation of contacts between the major geologic units;
   4. (4) A complete textural description of the major soil and bedrock units, with geologic interpretation, such as fill, till, stratified drift, and weathered bedrock;
   5. (5) The location of all data sources, including soil borings, monitoring wells, test pits, and bedrock cores upon which the geologic interpretations are based;
   6. (6) The line of section referenced to an appropriate site plan;
   7. (7) The offset distance for all data points not located directly on the line of section;
   8. (8) The screened interval of all groundwater monitor wells and piezometers, with measured water level or potentiometric surface elevations;
   9. (9) The surveyed elevations of any surface water features intercepted by the line of section; and
   10. (10) Contaminant concentrations at each data point indicated on the cross-section;

5. (e) A table of groundwater elevation data including:

   1. (1) Groundwater elevations;
   2. (2) Top of well casing elevations surveyed to the benchmark required under Env-Or 606.04(m)(4);
   3. (3) Measured depth to water table from top of casing;
   4. (4) If NAPL is present, measured depth to NAPL from top of casing; and
   5. (5) If NAPL is present, NAPL thickness;
6. (f) A potentiometric surface plan indicating the groundwater flow direction, with multiple plans as needed to show groundwater flow in different aquifers; and
7. (g) Any other information that is necessary to describe the geology and hydrogeology of the site.

Source. (See Revision Note at chapter heading for Env-Or 600) #8812, eff 2-1-07; ss by #10831, eff 6-1-15; ss by #14419, eff 11-4-25, EXPIRES: 11-4-35