ROSETTA RESOURCES — Warning Letter

520110025W_warning letter_11212011_text.pdf, page 1Official PDFWARNING LETTER CERTIFIED MAIL - RETURN RECEIPT REQUESTED [70063450000171041838] November 21, 2011 Mr. Tom Jones Operations Superintendent Rosetta Resources 2692 Amerada Road Rio Vista, CA 94571 CPF 5-2011-0025W Dear Mr. Jones: On December 7 to 10, 2010, a representative of the Pipeline and Hazardous Materials Safety Administration (PHMSA), pursuant to Chapter 601 of 49 United States Code, inspected manuals, records, and conducted a field audit of your pipeline facilities in Rio Vista, California. As a result of the inspection, it appears that Rosetta Resources has committed a probable violation of the Pipeline Safety Regulations, Title 49, Code of Federal Regulations, Part 192. The item inspected and the probable violation is: 1. §191.17 Transmission and gathering systems: Annual Report. (a) Except as provided in paragraph (b) of this section, each operator of a transmission or a gathering pipeline system shall submit an annual report for that system on Department of Transportation Form RSPA 7100.2-1. This report must be submitted each year, not later than March 15, for the preceding calendar year.#

520110025W_warning letter_11212011_text.pdf, page 2Rosetta Resources filed a supplemental report for calendar 2009, but it was not completed correctly. The report did not list miles of pipe by diameter size. Rosetta Resources listed 6.901 miles in the “4-inch or less” block of pipe size. The mileage for each pipe diameter size in your system must be provided. Under 49 United States Code, § 60122, you are subject to a civil penalty not to exceed $100,000 for each violation for each day the violation persists up to a maximum of $1,000,000 for any related series of violations. We have reviewed the circumstances and supporting documents involved in this case, and have decided not to conduct additional enforcement action or penalty assessment proceedings at this time. We advise you to correct the item identified in this letter. Failure to do so will result in Rosetta Resources being subject to additional enforcement action. No reply to this letter is required. If you choose to reply, in your correspondence please refer to CPF 5-2011-0025W. Be advised that all material you submit in response to this enforcement action is subject to being made publicly available. If you believe that any portion of your responsive material qualifies for confidential treatment under 5 U.S.C. 552(b), along with the complete original document you must provide a second copy of the document with the portions you believe qualify for confidential treatment redacted and an explanation of why you believe the redacted information qualifies for confidential treatment under 5 U.S.C. 552(b). Sincerely, Chris Hoidal Director, Western Region Pipeline and Hazardous Materials Safety Administration cc: PHP-60 Compliance Registry PHP-500 P. Nguyen (#128476)#