'Elevated' methane levels found at Rancho Cucamonga gas leak, officials say

RANCHO CUAMONGA >> Higher than normal levels of methane were detected in an Alta Loma neighborhood following a gas leak, according to initial findings from the South Coast Air Quality Management District.

The leak was reported May 8 in the area of Archibald Avenue and La Gloria Drive. The Southern California Gas Co. found a leaking 3-inch natural gas pipeline located in the street on Archibald Avenue and repaired it, according to officials.

Work, however, continues in the area “to remove trace amounts of natural gas trapped in the soil,” according to a SoCalGas statement. Residents report workers are on site 24/7.

A spokesman said the company has not determined yet how long gas was leaking.

Although the utility did not inform the Air Quality Management District of the leak, a member of the public did complain, and SCAQMD inspectors began investigating Friday, wrote spokesman Sam Atwood in an email to this publication. Air samples were taken to test.

“In general, results from the mobile survey measurements in Alta Loma have indicated that levels of methane are typical in the vast majority of the area,” Atwood Wrote. “However, elevated levels of methane were detected in instantaneous measurements in the areas near La Gloria and Archibald, the primary area of repair work, and also Lemon and Archibald.”

Methane is the main component of natural gas. Methane is a colorless and odorless gas, and it is flammable in high concentrations, Atwood said.

High levels of…

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