• The Participating Companies (Motorola, Siemens and GlaxoSmithKline) are obligated to cleanup the groundwater at the NIBW Superfund Site pursuant to an agreement with the U.S. EPA and the State of Arizona. Motorola is responsible for conducting this cleanup on behalf of the Participating Companies.

• Since 1981, the Participating Companies have spent over 100 million dollars on the NIBW cleanup. The groundwater cleanup will continue until the amount of TCE and other compounds meet all applicable EPA cleanup levels.

• The Participating Companies clean the NIBW groundwater through the operation of four “pump and treat” facilities in Scottsdale. The four facilities are the Central Groundwater Treatment Facility (CGTF), the Miller Road Treatment Facility (MRTF), the Area 7 Treatment Facility and the Area 12 Treatment Facility. The latter three facilities were originally constructed voluntarily by the Participating Companies in order to accelerate the NIBW cleanup and ensure that groundwater contaminants would be adequately captured and treated.

• All four facilities have air controls. These air controls are currently operating. The process of removing TCE and other compounds from the water results in air emissions. The purpose of the air controls is to remove TCE and other compounds from these emissions before discharging the air into the environment. When the treatment facilities were originally designed, the TCE levels in the air were anticipated to be much higher than they turned out to be.

• In 2004, Motorola notified the U.S. EPA of its belief that air controls were not necessary at the MRTF, Area 7 and Area 12. In 2007, Motorola notified the U.S. EPA of its belief that air controls were not necessary at the CGTF. In all cases, Motorola stated that it is continuing to operate air controls. Motorola will continue to operate air controls at all four facilities until the issue is formally resolved.

• The reason why Motorola believes air controls are not necessary is because the TCE levels at all four facilities are below the applicable regulation. According to the EPA cleanup plan, air controls are not required if air emissions contain less than 15 pounds/day of TCE and other compounds. The amount of TCE and other compounds being treated at each of the four NIBW facilities is well below this requirement.

• In addition, Motorola has conducted a risk assessment for each of the four treatment facilities to determine the calculated risk to human health if air controls were no longer operated. These risk assessments were undertaken using EPA methods and under EPA supervision. For all four facilities, the risk assessments calculate an excess lifetime cancer risk of less than 1 in a million, which is the level that U.S. EPA considers protective of human health.

• The cost to operate air controls is approximately $500,000 per year. Motorola has told EPA that it would be willing to redirect up to $1 million of these costs to community environmental projects (such as hybrid school buses or parks) to allow for an environmental and economic benefit that positively impacts the community.

• There may be other reasons why air controls are not desirable. For example, a recent analysis by Motorola and Professor John C. Crittenden at Arizona State University calculates that there are about 930 pounds of greenhouse gases created for every pound of TCE removed by the air controls at the CGTF, assuming current operating conditions.

• Motorola is tremendously proud of its achievements at the NIBW site as well as its positive relationship with the U.S. EPA, the State, the City and the community. Motorola has made significant progress in cleaning up TCE from the Participating Companies’ former operations.

• Through sound science, regulatory oversight and extensive public participation, Motorola is committed to completing the cleanup of the NIBW site.