SOUTH LOS ANGELES (CBSLA.com) — Residents Thursday marched in protest of oil drilling in their South Los Angeles neighborhood.

Protestors explained there are three separate drilling sites, two of which are operated by Freeport McMoran, that span over a mile radius within their community.

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One of the sites is located along Jefferson Boulevard, between Vermont and Normandie avenues.

Dozens voiced their concerns regarding the safety of their health with the toxic chemicals that are being transported in the area of their homes. They are fearful of what can’t be seen or even smelt.

“They perform acidization at their site, which involves trucking in these huge tanks that each hold 5,000 gallons,” said resident Niki Wong. “They are labeled with corrosive acids and hydrochloric acids.”

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Wong went on to explain the company has been in operation since 1965, however, an environmental report has never been conducted to sites in the area.

Over the years, there have been concerns linked to whether the company’s actions have caused illnesses to members of the community.

Residents say they have not been warned before deliveries are made, and they are seeking further transparency from the company.

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Freeport McMoran said the intention was to conduct routine maintenance work similar to work they perform on water supply wells all over the world. They added they are not planning any well stimulation.