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State of California • Department of General Services • Arnold Schwarzenegger, Governor
DIVISION OF THE STATE ARCHITECT
Headquarters • 1102 Q Street, Suite 5100 • Sacramento. CA 95314 • (916) 445-8100
Regional Office • 1515 Clay Street. Suite 1201 • Oakland, CA 94612 • (510) 622-3101
___________________________________________________________________________

May 19, 2006

Marcus A. Hibser
Arthur Tam & Associates
300 – 27th Street, 2nd Floor
Oakland, CA 95616

Subject: Division of the State Architect (DSA) Review of the Reports Titled,
“Portola Middle School, Hardship Related to Pre-existing Soil Conditions”, by
Arthur Tam & Associates dated March 1, 2006 and April 27, 2006
“Engineering Geology Review, Potential Earthquake-induced Landslide
Hazard”, by California Geological Survey, April 3, 2006
“Landslide Retention Study,” by Kam Yan & Associates dated September 20,
2005 and February 7, 2006
“Geological Engineering Investigation and Consultation, Potential
Earthquake-Induced Landslide Hazard,” by Alan Kropp & Associates, Inc.
dated January 30, 2006
Portola Middle School, DSA Application No. 01-106671, File No. 7-39 .

Dear Mr. Hibser:

DSA has reviewed the reports indicated above. In the report Alan Kropp & Associates
notes potential landslide hazard at Portola Middle School. COS concurs with them. Based
on the review of the statements made in the reports regarding the potential landslide
hazard, it is the opinion of DSA that there is a significant risk of earthquake induced
landslide. This potential for landslide is such that the health and safety of the pupils is at
risk and must be corrected.

Should you have any questions please call me at 510-622-3109.

Sincerely,

Nat Chauhan, Manager
San Francisco Bay Regional Office

Cc: Jennifer Thomburg, Senior Engineering Geologist, CGS
Bill Savidge, Engineering Officer, West CC USD
Office of Public School Construction