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PSSAC 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,  E-mail:,
Web Site:

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
E-mail: Website:

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. E-mail:

Bryan L. Rahn
Coastal Viticultural Consultants

1575 Deer Park Road, Angwin, CA  94508.  Phone (707) 965-3700,
Toll Free: (888) 965-3755.  E-mail: Web Site:

Roy J. Shlemon, Ph.D.
Roy J. Shlemon & Associates, Inc

P.O. Box 3066, Newport Beach, CA 92659-0620, Phone: 949-675-2696,
Fax: 949-675-5088, E-mail:,
Web site:


consultantindex.htm updated October 31, 2014


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Outline of California map, with inset horizons of San Joaquin State Soil

Professional Soil Scientists Association of California
P.O. Box 5972
Vacaville, CA 95696
Phone: (707) 447-2135 Ext. 2

Kim Chang building a San Joaquin State Soil monolith
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