TRACY (KCBS/AP) — Hazardous materials crews are cleaning up as many as 21,000 gallons of oil after a pipeline rupture in San Joaquin County near Tracy.

Shell Pipeline Co. officials say a response team is clearing contaminated soil and helping local and state officials monitor local air, water and ground conditions, The San Francisco Chronicle reported.

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Shell reported the leak after noticing that a line lost pressure Friday.

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The underground pipeline near Tracy was leaking crude oil into the soil but not near any waterways.

San Joaquin County officials said the oil was visible in a 250-by-40-foot section on the ground.

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Shell said there was no timeline for when oil flow will be turned back on.