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Malvern, Pennsylvania – Corporate Office

3 Mystic Lane

Malvern, Pennsylvania 19355

President: Bob Mundt

Phone: (610) 722-5500

Chillicothe, Ohio

P.O. Box 349

Chillicothe, Ohio 45601

Donald Jagel, P.G.

Senior Geophysicist and Branch Manager

Phone: (740) 600-0276

Northern California

1605 School Street

Moraga, California 94556

Roark Smith, PGp.

Senior Geophysicist and Branch Manager:

Phone/Fax: (925) 631-1989