SECTION 252:515-7-54. Groundwater elevation measurements

(a)   Groundwater/waste separation. The minimum distance between the highest groundwater elevation and the lowest elevation at which waste will be placed shall be determined.

(b)   Continuous water level monitoring. A continuous water level monitor system shall be installed in at least one piezometer that has water in it. Water levels in all other piezometers shall be monitored once each month for 12 months at approximately the same date each month.

(c)   Measurements after heavy rainfall. If significant changes in the water level in the continuous monitor are identified following heavy rainfall events, the DEQ may require additional measurements in other piezometers to further define the level of highest groundwater elevation.

(d)   Method defined. The elevation of groundwater in piezometers and monitor wells shall be measured according to the specifications of ASTM D4750.

[Source: Added at 20 Ok Reg 1151, eff 6-1-03]