Tesoro Logistics LP: Tesoro Logistics Restarts Mountrail County, North Dakota Pipeline

Tesoro Logistics LP: Tesoro Logistics Restarts Mountrail County, North Dakota

SAN ANTONIO - Nov. 1, 2013 - Tesoro Logistics, L.P. ("TLLP") is restarting its
Mountrail County, North Dakota pipeline following shutdown on Sept. 29 due to
a crude oil spill. Permission to return the line to service was granted by the
Pipeline and Hazardous Materials Safety Administration (PHMSA) following:

  *Acceptance by TLLP of a Safety Order from PHMSA;
  *Review by PHMSA and TLLP of the preliminary mechanical analysis of the
    failed segment;
  *PHMSA approval of a detailed restart plan submitted by TLLP.

The damaged portion of the pipeline was removed and sent to an independent
laboratory for analysis. While final results are pending, the preliminary
report indicates that the likely cause of the small diameter hole in the
pipeline was from electrical discharge. The source of the electrical current
remains under investigation. According to the initial lab report, there were
no signs of corrosion or other defects at the failure location.

To ensure integrity before restarting the line, TLLP took the following steps:

  *Performed a hydrotest on the replaced segment.
  *Executed a tightness test holding pressure on the 35-mile section of the
    line from Tioga to Black Slough to verify soundness of the system.
  *Conducted investigations at six different locations on the pipeline to
    address findings from the Sept. 10-11 smart pig inspection of the 35 mile
    section of the line from Tioga to Black Slough and found no areas of
  *Installed additional integrity monitoring equipment and online analysis
    along the entire 35-mile section designed to detect indications of a
    potential leak.

As of October 31, more than 4,500 of the estimated 20,000 barrels released
have been recovered from the site. There have been no injuries or known
impacts to water or wildlife as a result of this incident. Remediation is
underway. Since becoming aware of the spill, TLLP has worked closely with the
landowner; PHMSA; the North Dakota Department of Health; and public safety and
regulatory authorities.

Tesoro Logistics LP, headquartered in San Antonio, Texas, is a fee-based,
growth-oriented Delaware limited partnership formed by Tesoro Corporation to
own, operate, develop and acquire crude oil and refined products logistics

For more information, visit www.tesoroalert.com.


Tesoro Media Relations, Media@tsocorp.com, (210) 626-7702

Chris Castro, Manager, Investor Relations, (210) 626-7202


This announcement is distributed by Thomson Reuters on behalf of Thomson
Reuters clients.

The owner of this announcement warrants that:
(i) the releases contained herein are protected by copyright and other
applicable laws; and
(ii) they are solely responsible for the content, accuracy and originality of
information contained therein.

Source: Tesoro Logistics LP via Thomson Reuters ONE
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