GROTON -- Honeywell Corp. representatives told the Conductorlab Oversight Committee Tuesday that the latest testing on the hazardous waste site confirmed that harmful chemicals at the company's 430 Main St. site are below dangerous levels and plans were being made to demolish an existing building on the property.

"We are very hopeful that we continue to get good data over the next three quarters," Honeywell remediation manager Maria Kaouris said.

Kaouris said that four consecutive quarters of testing with traces of organic solvents called trichloroethene or TCE within acceptable limits must be registered before the property can pass rigorous federal and state safety standards.

Already, said Kaouris, one quarter has met the standard with only three more to go over the course of 2014.

Should safety levels be maintained over those subsequent quarters, a risk assessment of the property would be conducted and submitted to the state for approval followed by demolition of the building and eventual disposition of the property.

Contaminants in the ground at the Main Street site included metals (hexavalent chromium) and TCEs that were used as degreasers in the manufacture and later treatment and disposal of circuit boards.

Residual contaminants in the soil are all that is left of a company called Conductorlab which opened the manufacturing facility in 1958 and that remained in operation at the 3.2 acre site until closing its doors in 1985.

Since that time, only the groundwater and treatment system have been in operation with such Honeywell subsidiaries as Grimes Aerospace performing monitoring duties at the site which have included the installation of groundwater monitoring wells on and off the property, water and soil sampling, and indoor air quality testing.

For more on this story, see Wednesday's Sun or visit http://www.lowellsun.com.