Pursuant to Senate Bill 4 (Pavley 2013), the California Natural Resources Agency commissioned
the California Council on Science and Technology (CCST) to conduct an independent scientific
assessment of well stimulation treatments, including hydraulic fracturing, in California.
The purpose of the report was to synthesize and assess the available scientific information
associated with well stimulation treatments (WST) in California. The review surveyed hydraulic
fracturing, matrix acidizing, and acid fracturing as they are applied both onshore and offshore for
oil and gas production in the state. The study workscope was organized in three major areas, which
were documented in three separate report volumes, described below.
CCST established an interdisciplinary steering committee to oversee the effort that included
experts in technical areas relevant to well stimulation and its impacts in California. Dr. Jane C.S.
Long served as the science lead for the project and Lawrence Berkeley National Laboratory (Berkeley
Lab) was the primary research institution supporting CCST in the scientific assessment. CCST issued the final report following peer review. "Our effort is to provide independent, scientific,
peer-reviewed information that can inform policymakers," said Susan Hackwood, Executive Director of
Report Volumes and Release Dates
CCST delivered the final volumes of the report to the California Natural Resources Agency on July 1, 2015.
CCST released the final volumes of the report to the public on July 9, 2015.
This document summarizes key findings, conclusions, and recommendations of all three volumes. (Public Release: July 9, 2015)
Volume I provides the factual basis describing what well stimulation treatments (WST) 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.
Volume II discusses how well stimulation could affect water, atmosphere, seismic activity, wildlife and vegetation, and human health. Volume II reviews available data, and identifies knowledge gaps and alternative practices that could avoid or mitigate these possible impacts. (Public Release: July 9, 2015)
Volume III presents four case studies that assess environmental issues and qualitative risks for specific geographic regions: Offshore, Monterey Formation, Los Angeles Basin, and the San Joaquin Basin. (Public Release: July 9, 2015)