UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
 

REGION IX
 

75 Hawthorne Street
 

San Francisco, CA 94105·3901
 

OFFICE OF THE 

REGIONAL AOMI"lISTRATOR 

JUN 14 2011 

The Honorable Eddie Baza Calvo 

Governor 

Territory of Guam 

Ricardo J. Bordallo Governor's Complex 

Adelup, Guam 96910 

Dear Governor Calvo: 

On September 9, 2009, the U.S. Environmental Protection Agency (EPA) sent a letter infonning 

Governor Camacho of Guam's opportunity to provide recommendations on air quality designations for 

the revised National Ambient Air Quality Standards for lead throughout Guam. This letter is to notify 

you of the EPA's preliminary decision to designate all of Guam as unclassifiable/attainment and to 

infonn you of our approach for completing the designations for the revised lead standards. 

Reducing levels of lead pollution is an important part of the EPA's commitment to a clean, healthy 

environment. Lead exposure can cause a range of adverse health effects, most notably in children. 

Exposures to low levels of lead early in life have been linked to effects on IQ, learning, memory, and 

behavior. 

On October 15,2008, the EPA substantially strengthened the health-based or "primary" National 

Ambient Air Quality Standard for lead by lowering it from 1.5 micrograms per cubic meter (llg/m3

) - a 

level set in 1978 - to a level of 0.15 Ilg/m3. This stronger standard provides increased protection against 

adverse health effects associated with exposure to lead in at-risk groups, including children. To provide 

increased protection against lead-related environmental and other welfare effects, the EPA revised the 

secondary National Ambient Air Quality Standard to be identical in all respects to the revised primary 

standard. The EPA also detenllined that the pre-existing ambient lead monitoring network was 

inadequate for detennining whether many areas are meeting the revised lead standards and establ ished 

new criteria for siting ambient lead monitors and new data collection requirements. Monitors meeting 

the new network siting requirements were to begin operation January 1,2010. 

Within two years of promulgating new or revised National Ambient Air Quality Standards, the Clean 

Air Act requires the EPA to complete the initial process of identifying or designating areas that meet or 

do not meet an air quality standard. If the Administrator has insufficient infoll11ation to make these 

designations, the EPA has the authority to extend the designation process by up to one year. In Iight of 

the new monitoring network, the EPA is completing the lead designations in two rounds. In the first 

round, published on November 16, 2010, the EPA designated as "nonattainment" 16 areas as violating 

the 2008 Lead National Ambient Air Quality Standards based on data from the pre-20l 0 monitoring 

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network. For all other areas, the EPA extended the deadline for designations by up to one year so that 

data from the newly deployed monitors can be considered in making appropriate designation decisions. 

States were given an opportunity to update their recommendation letters for those remaining areas for 

our consideration in the second round of designations by December IS, 20 IO. The EPA intends to 

complete the second round of lead designations by no later than October 14, 2011. 

Consistent with the Clean Air Act, and after carefully considering all the associated technical 

information for the 2008 Lead National Ambient Air Quality Standards, the EPA is proposing to 

designate Guam as unclassifiable/attainment. The EPA uses this designation for initial designations to 

identify areas that have data indicating attainment, or where there is no evidence of a violation. 

The EPA's preliminary designation decisions and supporting documentation will be made available to 

the general public for review. We will be accepting comments through August 15,2011. We will review 

any information we receive from Guam and the general public by this date, and we plan to promulgate 

the second round of final designations by October 14, 2011. 

We look forward to a continued dialogue with you and your staff as we work together to implement the 

2008 Lead National Ambient Air Quality Standards. Should you have any questions, please do not 

hesitate to call me, or have your staff contact Air Division Director Deborah Jordan at 415-947-8715. 

cc:	 Ivan Quinata 

Administrator, Guam EPA 

Peter Cruz 

Air Pollution Control Program Manager, Guam EPA