A revised FINAL update of Chapter 6 of the Technical Guidance Manual for Hydrogeologic Investigations and Ground Water Monitoring (TGM): Drilling and Subsurface Sampling has been posted to the Ohio EPA DDAGW Web page.

A revised DRAFT update of Chapter 12 of the Technical Guidance Manual for Hydrogeologic Investigations and Ground Water Monitoring (TGM): Ground Water Quality Organization and Interpretation has been posted to the Ohio EPA DDAGW Web page.  Comments will be accepted for Chapter 12 until December 29, 2017.  Please send comments to:

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Ohio EPA
Division of Drinking and Ground Waters
50 West Town Street, STE. 700
PO Box 1049
Columbus Ohio 43216-1049