Soil Consultants

Welcome to the Professional Soil Scientists Association of California’s Consultant’s Directory.

Many of PSSAC’s members are private consultants. The following offer consulting services in their areas of specialization, and welcome inquiry by potential clients. Please click on their names to link to their individual pages for additional information including their certifications and areas of expertise. They are listed in alphabetical order:

Glenn Borchardt, Ph.D.
Soil Tectonics
 P.O. Box 5335, Berkeley, CA 94705-0335,
Phone: (510) 654-1619, Cell: (510) 205-4562, Fax: (530) 655-0018,,
Web Site:
Margaret Bornyasz

ECORP Consulting, Inc.

3914 Murphy Canyon Rd., Ste. A232, San Diego, CA 92123
Phone:  (858) 279-4040; Fax: (858) 279-4043
Email:; Website:
Terry D. Cook
Soil Consultant
3214 Lillard Drive, Davis, CA 95616.
Phone or Fax: (530) 753-1062
Sidney W. Davis
DAVIS² Consulting Earth Scientists
P.O. Box 734, Georgetown, CA 95634.
Phone (530) 333-1405, Fax (530) 333-1009
Meagan M. Hynes, Ph.D.
Talus Soil Consulting
 P.O. Box 8004, Santa Cruz, CA 95061.
Phone: (408) 859-9726
David B. Kelley
Kelley & Associates Environmental Sciences, Inc.
 20 E. Baker Street, Winters, CA 95694.
Phone: (530) 795-6006, Fax: (530) 795-6008,
Roger J. Poff
R.J. Poff & Associates
P.O. Box 2073, Nevada City, CA 95959.
Phone (530) 273-1709,Mobile: (530) 559-9669.
Bryan L. Rahn
Coastal Viticultural Consultants
1575 Deer Park Road, Angwin, CA  94508.
Phone (707) 965-3700,Toll Free: (888) 965-3755.
Web Site: