(a) Purpose and design. The subsurface investigation shall:
- (1) be performed to determine the location of the uppermost saturated zone(s); and
- (2) be designed to protect all saturated zones encountered while drilling.
- (b) Methods. Dry methods of subsurface exploration, such as auger, air rotary, or cable tool, shall be used. Other methods may be approved by the DEQ on a case-by-case basis.
- (c) Verification of previously submitted data. When a significant period of time has elapsed between the initial investigation and actual construction that there is a reasonable likelihood subsurface conditions have changed, the DEQ may require verification of data contained in a previously submitted subsurface investigation.
Added at 20 Ok Reg 1151, eff 6-1-03