Pacific Gas and Electric Co. declared two high-pressure gas transmission pipes safe last year despite paper-trail gaps that left the utility ignorant of whether portions of the lines were running above legally allowed pressure levels, a Chronicle investigation shows.

One of the pipes runs through Discovery Bay and Brentwood in eastern Contra Costa County and is among the highest-pressure lines in the utility’s system. PG&E documents show the company did not know the grade of pipe at three places near the line’s eastern terminus at an underground gas storage site west of Stockton, but certified the segments safe anyway in a document intended to show that the utility was complying with federal pipeline inspection laws.

Read more: San francisco Chronicle, December 11, 2011

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