A 30-inch line and 26-inch line are both within 200 feet of the exploded pipe.
The lines help supply demand to customers near Washington.
The 26-inch line, known as SM-86, was back in service the night of the explosion. It is 183 feet from the exploded pipe, according to a company plan.
"Pressure was restored slowly over a 2.5-hour period to verify the integrity of the pipeline," the company told the state Public Service Commission.
As it slowly put gas back into the line, the company had people patrolling the pipe by foot and by helicopter looking for leaks.
Columbia has developed a similar plan to return the 30-inch line known as the "SM-86 loop" to service on Wednesday.
That line is 53 feet north of the exploded pipe, according to the company plan.
The company said it could do so without closing either Interstate 77 or Kanawha 21 (Sissonville Drive).
The company had previously floated the idea of rerouting traffic in the Sissonville area while the company gradually refilled the SM-86 loops with gas. The state Department of Transportation was not a fan of the idea, which could have closed a major interstate for several hours the week before Christmas.
Columbia also hired Det Norske Veritas, an international risk management company, to study whether last week's explosion could have damaged the 30-inch line nearest the ruptured pipe.
The consultant, known as DNK, concluded it was unlikely the nearby pipe had suffered any damage.
Citing another report by the Pipeline Research Council International, DNK said, "a spacing of at least 25 feet, regardless of other factors such as pipe diameter, gas flow in the second pipeline, etc., is sufficient to reduce possible thermal damage to parallel pipelines." The nearby pipe was more than twice that distance from the ruptured pipe.
But the consultant said there was "finite, albeit small, probability that a near critical defect existed" just before the flow of gas was stopped to the pipe. Columbia shut off the flow of gas to all three pipes in the hour following the explosion.
"This defect could grow to a critical size as a result of the large pressure cycle associated with depressurization and re-pressurization of the pipeline, resulting in a rupture or leak," DNK cautioned.
Columbia said it was confident it could return its pipeline to service this week in a "slow and controlled manager, gradually increasing supply and pressure."
"In addition to performing the analysis to confirm that the incident did not affect Line SM-86 Loop in the vicinity of the incident, Columbia reviewed past inspection and testing data for Line SM-86 Loop to further ensure the safety of the pipeline," company spokeswoman Chevalier Mayes said in an email.
"A detailed review of these past inspections confirms that the lines are safe to return to service, and the data from these past inspections was reviewed in detail with representatives of the (state and federal pipeline regulation agencies)."
Some of the data for that analysis came from a smart pig inspection in 2009, Columbia told the state PSC.