EPA Retrospective Study in Bradford County , PA - Weston Solutions
Evaluation of Data
John Satterfield to: Ramona Trovato

05/17/2012 02:03 PM

Cc: Jeanne Briskin, Stephanie Timmermeyer

Ramona:
 
As you know, Chesapeake's consultants collected split samples from residential drinking water sources 
during EPA's retrospective study field work in Bradford County, PA in October and November 2011.  
Though EPA sampled 37 total residential drinking water sources during this effort, Chesapeake's 
consultants were only able to obtain split samples from 14 residential wells and 1 spring.  Access to 
collect splits from the other EPA sampling sites was denied Chesapeake's consultant by the associated 
landowners.
 
Chesapeake commissioned WESTON Solutions to evaluate the data in respect to previously collected 
Chesapeake samples from some of the studied drinking water sources and historic regional drinking 
water quality as available from the United States Geologic Survey.  Based upon this evaluation, WESTON 
concludes these 15 residential drinking water sources do not appear to be impacted by Marcellus Shale 
natural gas drilling or production activities - including hydraulic stimulation.
 
Please note that we have begun disseminating this report to other appropriate stakeholders (i.e., 
landowners, PA DEP) and will make the document available to the public via the internet in the near 
future.
 
Chesapeake understands and supports EPA's critical evaluation of all sources of secondary information 
used in its hydraulic fracturing study. We hope you will consider the attached as you review and 
interpret your own sets of data and certainly welcome any comments or questions you may have 
regarding the WESTON report.
 
Please feel free to contact Stephanie or me if you'd like to discuss further.
 
Thank you,
John Satterfield
Director Environmental and Regulatory Affairs
Chesapeake Energy Corporation
Office: (405) 935-3171
Fax: (405) 849-3171
E-mail: john.satterfield@chk.com

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any). CHK.Report_041312.pdf