Guidance Document 12

Attachment 1 - Groundwater Monitoring Reporting Requirements


Information submitted to MDA should include:

  1. Analytical results for samples including QA samples;
  2. Stabilization, purge volume and/or recovery rate test forms;
  3. Copies of "chain-of-custody" forms, lab analytical reports, lab QA/QC reports, and MDA Laboratory Data Review Checklist - GD29 Attachment (PDF) ;
  4. Copies of field records;
  5. Water level measurements to the nearest 0.01 foot from the surveyed point referenced to the National Geodetic Vertical Datum or an identified benchmark;
  6. A table showing all water level information to date;
  7. A table showing all analytical results to date. Include numerical information (specify reporting limit) rather than “non detect” for those parameters not detected above reporting limits.
  8. A detailed site map showing the location of all monitoring wells with groundwater elevation contours. The map should clearly indicate the elevations of groundwater contour lines and groundwater elevations in each well. The map should also indicate expected direction of groundwater flow with a directional arrow. All maps should have a north arrow and scale;
  9. A brief description of how the groundwater contour map was completed (for example, the name of the groundwater model used);
  10. A statement explaining the reasons for and ramifications of any deviation in sampling, analytical techniques or equipment from those stated above or in the laboratory QA/QC Plan;
  11. A hydrograph showing changes in water level elevations over time;
  12. Provide all calculations needed to determine unionized ammonia concentrations, if required; and
  13. Provide all calculations needed to determine the horizontal hydraulic conductivity from slug or plug test data.


Once a year, or as agreed to by MDA, a summary and discussion of the monitoring results should be submitted to the MDA. This annual summary should:

  1. Identify recent and long-term trends in the concentrations of monitored constituents and in water elevations;
  2. Tabulate the analytical results to date and highlight those that exceeded groundwater regulatory standards (such as Health Risk Limits, Health Based Values or Maximum Contaminant Levels). On tables, include numerical information such as <0.1 rather than “Not Detected” for those parameters not detected above reporting limits and list the regulatory standards;
  3. Provide concentration vs. time graphs for selected analytical parameters. Use an appropriate scale so that all data is easily seen;
  4. Provide a hydrograph showing changes in water level elevations over time;
  5. Evaluate the effect the facility is having on groundwater;
  6. Suggest any additions, changes, or maintenance needed in the monitoring program; and
  7. Provide a groundwater flow map (see eighth bullet above).