(dailynews.com) The first draft of a years-long awaited clean-up plan for the Santa Susana Field Laboratory has drawn concern from Los Angeles city and county officials as they wade through the more than 1,100-page document compiled by California regulators.

The draft environmental plan released last week by the state’s Department of Toxic Substances and Control summarizes soil and water and water clean-up on the Santa Susana Field Lab, a 2,900-acre site nestled between Simi Valley and Chatsworth. The site was developed in the 1940s to test rocket engines and conduct nuclear research.

In 2007, the DTSC signed a consent order, setting a 2017 deadline for Boeing, the federal Department of Energy and NASA to complete the site cleanup. Three years later, the Department of Energy and NASA signed the agreement to clean their small portions of the land to the highest environmental standards.

But most of the land is owned by the Boeing Company and even though the DTSC had said they would hold Boeing responsible for cleaning up their portion of the land to strict, environmental standards, local lawmakers remain skeptical. The concern arose after Boeing released a letter on Aug. 22 to shareholders, saying they have changed the clean-up standard from “suburban residential” to “recreational.”

“The revised proposed cleanup will be based on recreational land use scenarios, and not a ‘residential’ cleanup as we originally volunteered,” according to the Boeing letter. “Our proposed cleanup will protect the health of any individuals who will visit the site in the future for recreational purposes and the residents in the surrounding neighborhoods. It will also protect the ecological resources that make the site a unique open space and wildlife habitat, as well as preserve the invaluable Native American cultural resources.”

County leaders from both Ventura and Los Angeles responded in a letter to the DTSC and California Environmental Protection Agency, saying they were concerned that the change in designation would permeate into the final clean-up plan. They fear the land would remain contaminated.

“Boeing’s attempt to reduce the level of clean up to a much weaker standard will leave some of these toxicants in place, risking people’s health long into the future,” according to the letters, signed by Los Angeles County supervisors Sheila Kuehl and Kathryn BargerLos Angeles Councilman Mitch Englander and Ventura County Supervisors Linda Parks and John Zaragoza.

Read more here: Boeing altered its cleanup plan for toxic Santa Susana land. Here’s why that worries local leaders