CA Hydraulically Fractured Wells (generalized, 3-5-2013)
The California Department of Conservation Division of Oil, Gas, and Geothermal Resources (DOGGR) publishes data related to oil and gas wells at:

http://www.conservation.ca.gov/dog/maps/Pages/GISMapping2.aspx

The downloaded list includes records for over 215,000 wells, of which 1,216 are flagged as hydraulically fractured.  Of those, 1,210 have location data.  This layer was created by forming a one mile buffer around those wells, then disolving into a single cartographic feature, for the purpose of increasing map performance at scales beyond 1:750,000.
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