On behalf of the California Natural Resources Agency (CNRA), please see the following information:

Pursuant to Senate Bill 4, the California Natural Resources Agency (CNRA) commissioned the California Council on Science and Technology (CCST) and Lawrence Berkeley National Laboratory (LBNL) to conduct an independent scientific assessment of well stimulation, including hydraulic fracturing, in California.
On January 14, 2015, CCST released Volume I of the assessment to the public.

Volume I, which is titled "An Independent Scientific Assessment of Well Stimulation Technologies in California: Well Stimulation Technologies and their Past, Present, and Potential Future Use in California", provides the factual basis describing what well stimulation treatments are, how they are conducted in general and practiced in California, and where they have been and are being used for oil and gas production in the state.  The full independent scientific assessment will be issued in three volumes. Volumes II and III will be released in July 2015.

To view or download the report, please visit the CCST website at: http://www.ccst.us/projects/hydraulic_fracturing_public/SB4.php