Shell announced last Tuesday that crews have repaired the crude oil pipeline that spilled up to 21,000 gallons of crude underground in the undeveloped terrain near Tracy, just east of San Francisco.
A spokeswoman with the state Water Resources Control Board reported that none of the spill leaked into waterways and that the groundwater reserves are deep enough to have a low risk of possible contamination.
When a company command center noticed a problem in the pipeline, they shut the pipeline down within one minute and notified federal and state agencies within two hours of the spill.
Although the result of the rupture is significantly smaller than the recent Santa Barbara spill, during which more than 120,000 gallons of oil leaked onto the coastline, environmentalists are investigating any possible threat to wildlife from the leak. Authorities are also assessing the pipeline for any other signs of potential leaks.