Wis. Admin. Code Department of Natural Resources NR 507.06

Current through October 28, 2024

Section NR 507.06 - Groundwater monitoring well design and installation

All groundwater sampling devices shall be designed, located, installed and maintained so as to obtain reliable and representative information regarding aquifer characteristics, groundwater flow directions and chemical and physical characteristics of groundwater. All groundwater monitoring wells shall be designed and installed in accordance with ch. NR 141 and the requirements of this section unless an alternate method is approved in writing by the department.

(1) DRILLING METHOD. Drilling fluids may not be used for installing monitoring wells unless no reasonable alternative exists. If drilling fluids are used, the driller shall document the type of fluids used and the chemical constituents of the mixture. If water is used, the source of the water shall be identified and the water shall be analyzed for all detection groundwater monitoring parameters listed in ch. NR 507 Appendix I, Table 1, under municipal solid waste. The drilling method shall meet all of the following:

(a) Bedrock drilling shall be performed in accordance with s. NR 507.05 and ch. NR 141.

(b) Standard penetration tests shall be performed while drilling in soil. Soil drilling methods in fine grained soil environments shall allow the driller to obtain undisturbed soil samples. If a drilling method does not allow for standard penetration tests, then the shear strength of the recovered fine-grained soil samples shall be estimated and recorded in the field with a pocket penetrometer or vane shear.

(c) If the drilling method does not allow the required soil or rock sampling to be performed, a separate boring shall be drilled adjacent to the monitoring well to provide the necessary information.

(2) BOREHOLE ABANDONMENT. If any borehole is deeper than the well to be placed in it, the portions of the borehole below the well screen shall be properly sealed in accordance with ss. NR 507.08 and 141.25(2) (d).

(3) IN-FIELD HYDRAULIC CONDUCTIVITY TEST. An in-field test shall be conducted on each well to determine the in-situ hydraulic conductivity. The test shall be of long enough duration and include sufficient data to provide a representative estimate of the actual hydraulic conductivity.

Wis. Admin. Code Department of Natural Resources NR 507.06

Cr. Register, June, 1996, No. 486, eff. 7-1-96; correction in (1) (intro.) made under s. 13.92(4) (b) 7, Stats., Register April 2013 No. 688.