Small amounts of oil and tar washed ashore as far south as San Diego County on Thursday as cleanup and recovery efforts accelerated following the oil spill along the Orange County coast.

Officials said they’ve made progress in the cleanup and hope to advance even further over the weekend. But a storm that meteorologists say could bring 20-mph winds to the region is moving in, raising concerns that more oil could reach the shores. So far, much of the crude has remained offshore, but striations have been seen in Huntington Beach and Laguna Beach.

More than 800 people have been clearing oil from Sunset Beach in Huntington Beach to Carlsbad. By the end of the week, officials expect to ramp that number up to 1,500.

A pollution-control vessel has been working off the Huntington Beach coast where a plume of oil has lingered since the spill. Two other vessels were tackling another slick that has slowly moved south over the past four days and is now off the coast of San Clemente, maps show.

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