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The park service began dumping debris from the East Wing onto the golf course in October, and more than 30,000 cubic yards (810,000 cubic feet) of excavated soil had been transported to the site as of last month, the report by Jacobs Engineering Group Inc. said. The report was requested by the park service.

The nonprofit DC Preservation League has sued the Trump administration, arguing that the dumping was unlawful and possibly hazardous. The group also is challenging the Republican administration’s takeover of the golf course, about 2 miles (3 kilometers) southeast of the White House, and others in the city.

The suit is one of several legal battles challenging Trump’s extraordinary efforts to put his mark on public spaces in the nation’s capital, including and building a 250-foot-tall (76-meter-tall) near the Lincoln Memorial.

At the end of last year, a separate group of preservationists seeking to prevent the administration from demolishing the East Wing so it could build a ballroom, a project slated to cost $400 million.

A spokesperson for the Interior Department, which oversees the park service, said in an email Tuesday that the soil removed from the White House “was tested multiple times, by multiple parties, and this project passed all standards set by law.”

While the agency does not comment on litigation, "this thorough process was followed to ensure the transfer was safe for the public,'' spokeswoman Katie Martin said.

The Preservation League's executive director, Rebecca Miller, said Tuesday that experts were still analyzing the engineering report. The group also is concerned about whether the Trump administration is complying with federal laws, including the ��ɫtv Historic Preservation Act and the ��ɫtv Environmental Policy Act, she said.

Debris from the East Wing demolition is so prevalent that it causes golfers to detour around piles of it, Miller said. “If you Google you’ll see lots of photos of golfers walking past it,” she said in an interview.

The Trump administration's plans to renovate the 105-year-old course to make it a professional-level course would permanently alter its historic character and layout, Miller said.

A federal judge told the government on Monday without first providing notice amid the legal dispute.

U.S. District Court Judge Ana Reyes said during a remote hearing that she wasn’t going to issue a temporary restraining order just yet, but she indicated she would take a harsh view of any major alterations made without prior notice.

Democracy Forward, a national legal organization that is co-representing the Preservation League, said in a press release that "further scrutiny will be required related to potential toxins that were dumped at East Potomac Park by the administration as part of the destruction of the East Wing of the White House.”

Test results released by the government “suggest the Defendants dumped a cocktail of contaminants — and despite indications of the refuse’s contents, they continued dumping it,” the group said.

Kevin Griess, the superintendent of the ��ɫtv Mall and Memorial Parks for the park service, said during Monday’s court hearing that there was no immediate plan to begin tree removal, but added that a safety assessment was underway.

Trump, an avid golfer, also plans to renovate just outside Washington that has been used by past presidents for decades.

In her statement, Martin said the Interior Department is “committed to continuing the relationships we have built with the local golf communities to ensure these courses are safe, beautiful, open, affordable, enjoyable, accessible, and world-class for people living in and visiting the greatest capital city in the world.”