N.J. Admin. Code § 7:9D-2.9

Current through Register Vol. 56, No. 24, December 18, 2024

Section 7:9D-2.9 - Required materials for sealing the annular space of any well

(a) Except with the written approval from the Department pursuant to N.J.A.C. 7:9D-2.8, only the following materials shall be acceptable for the sealing of the annular space between the casing and the oversized borehole or between casing(s) of multiple cased wells:

1. Portland Neat Cement in accordance with N.J.A.C. 7:9D Appendix A, Table 1, which is incorporated herein by reference;

2. Portland Cement and Sodium-based Bentonite in accordance with N.J.A.C. 7:9D Appendix A, Table 2, which is incorporated herein by reference;

3. Sodium-based Bentonite in accordance with N.J.A.C. 7:9D Appendix A, Table 3, which is incorporated herein by reference;

4. Cement-based geothermal grout in accordance with N.J.A.C. 7:9D Appendix A, Table 4, which is incorporated herein by reference;

5. Bentonite-based geothermal grout or equal in accordance with N.J.A.C. 7:9D Appendix A, Table 5, which is incorporated herein by reference; or

6. Sodium-based Bentonite chips and shaped pellets, may be used in accordance with N.J.A.C. 7:9D-2.10(a)5 provided they shall not be used in an environment where it will come in contact with groundwater of a pH of less than 5.0 or a total dissolved solids content in excess of 1,000 ppm.

(b) All materials specified in (a)1 through 5 above shall be accurately measured prior to mixing. All grout materials shall have a maximum permeability of 1 x 10<-7> centimeters per second when prepared in accordance with manufacturer's specifications. The permeability value shall be obtained using ASTM method D5084 or equivalent, incorporated herein by reference, as amended and supplemented, as approved by the Department.

(c) Bentonite products and additives shall be mixed in accordance with manufacturer's specifications.

(d) Bentonite-based thermally enhanced geothermal grout materials containing a minimum silica sand content of 200 pounds per 50 pounds of bentonite, may be used in consolidated formations, provided the permeability meets the value specified at (b) above. All other Bentonite-based grout materials shall not be used for sealing any annular space in consolidated formations, or in those instances where it will come in contact with groundwater of a pH of less than 5.0 or a total dissolved solids content in excess of 1,000 ppm.

(e) Where the grout material extends through zones of salt water, a cement-based grout approved for use in salt water environments shall be used. See N.J.A.C. 7:9D Appendix A for mixes approved for use in salt water environments.

N.J. Admin. Code § 7:9D-2.9

Amended by 50 N.J.R. 171(a), effective 1/2/2018