UNITEDSTATES ENVIRONMENTAL PROTECTION AGENCY

REGION 6

1445 ROSS AVENUE, SUITE 1200

DALLAS, TX 75202-2733

JUN 1 4 2010

Ms. Peggy Hatch

Secretary

Louisiana Department of Environmental Quality

Post Office Box 4301

Baton Rouge, Louisiana 70821

Dear Secretary Hatch:

Thank you for your recommendations on air quality designations for the revised National

Ambient Air Quality Standards (NAAQS) for lead throughout Louisiana. Reducing levels of

lead pollution is an important part ofthe u.S. Environmental Protection Agency's (EPA)

commitment to a clean, healthy environment. Lead exposure can cause a range of adverse health

effects, most notably in children. Exposures to low levels oflead early in life have been linked

to effects on IQ, learning, memory and behavior. This letter is to notify you ofEPA's response

to Louisiana's designation recommendations, and to inform you ofour approach for completing

the designations for the revised lead NAAQS.

On October 15, 2008, EPA substantially strengthened NAAQS for lead. The new

standards, set at 0.15 micrograms per cubic meter (ug/rrr'), are 10 times tighter than the previous

standards. In conjunction with strengthening the lead NAAQS, EPA also established new

criteria for siting ambient lead monitors. The pre-existing ambient lead monitoring network was

inadequate for determining whether many areas are meeting the revised lead NAAQS. Monitors

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

The Clean Air Act requires EPA to complete the initial designation process within two

years of promulgating a new or revised NAAQS. Ifthe Administrator has insufficient

information to make these designations, EPA has the authority to extend the designation process

by up to one year. In light ofthe new monitoring network which will generate additional

information in the upcoming year, EPA intends to complete the lead designations in two rounds.

In the first round, to be completed by October, 15,2010, EPA is designating as "nonattainment"

any area that is violating the 2008 lead NAAQS based on data from the pre-201O monitoring

network. For all other areas, EPA is extending 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. EPA will complete the second round oflead designations no later than October 15,

2011.

We have reviewed Louisiana's October 15,2009, recommendation letter on air quality

designations and all the associated technical information for the 2008 lead NAAQS, including, if

available, the most recent air quality data from 2007-2009. However, EPA is not intending to

complete the initial area designations for your state at this time. Instead, EPA intends to

designate all areas in your state no later than October 15,2011, in the second round oflead

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Letter to Secretary Hatch

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designations. If you would like to submit updated recommendations for your areas for our

consideration in the second round of designations, we request that you do so by December 15,

2010. For the second round of designations, we will notify all states and tribes of our

preliminary responses to their recommendations no later than June 17, 2011.

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

implement the 2008 lead NAAQS. If you have any questions, please call me at (214) 665-2100,

or your staffmay call Mr. Emad Shahin ofmy staff at (214) 665-6717.

cc: Mr. Michael Vince

Administrator, Air Quality Assessment Division

Louisiana Department of Environmental Quality