Exhibit 23(b)

CONSENT OF INDEPENDENT PETROLEUM ENGINEERS

The undersigned hereby consents to the incorporation by reference in this Registration Statement on Form S-8 of the references to our firm in the form and context in which they appear in the Annual Report on Form 10-K of Layne Christensen Company for the year ended January 31, 2006.

Sincerely,

/s/ Cawley, Gillespie & Assoc., Inc.

Cawley, Gillespie & Associates, Inc.

July 6, 2006