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GARY R. HERBERT OFFICE OF THE GOVERNOR GREG BELL
GOVERNOR SALT LAKE CITY, UTAH LIEUTENANT GOVERNOR

84114-2220



### October 12, 2009

Carol Rushin, Acting Regional Administrator U. S. Environmental ProtectionAgency, Region 8 1595 Wynkoop Street Denver, CO 80202-1129

DearMs. Rushin:

The revised national ambient air quality standards (NAAQS) for lead promulgated in October 2008 require that by October 15,2009, states make recon1n1endations to the Environmental ProtectionAgency for areas to be designated attainment, nonattainment,

orunclassifiable based on ambient lead monitoring datacollectedbetween 2006-2008.

The State ofUtah recommends that all 29 counties inUtahbe designated unclassifiable for the primary and secondary lead standards. With approval from EPA Region 8, the State has not monitored for lead in the an1bient air since September 2005. Leadmonitoring was haltedbecause measured levels oflead were extremely lowrelative to the former primary and secondary lead standards (1.5**~g/m3** 

### quarterly average). Consequently, insufficient information is available to determine the current attainment status ofeach area ofUtah. Ifa violation ofthe lead standard is measured at any lead monitoring site before EPA issues its final designations, the State will submit a revised recommendationto the Agency as expeditiously as possible.

We look forward to working with you and your staffto implementthe revised lead standards inUtah. Shouldyou have questions, please contact Cheryl Heying, Director, Utah Division ofAir Quality, (801) 536-4022.

RECEIVED U.S. EPA Region8 

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# s-ti**5'·"·'~l** Gary R. Herbert Governor 

## OCT 132009

EnclosureOverview ofLead Monitoring Data in Utah

The EPA has revised the level ofboth the primary and secondary lead NAAQS to 0.15Ilg/m3to improve health protection for at-risk groups, especially children. An area is considered in compliance with the revised lead standard ifmeasured lead concentrations do not exceed 0.15Ilg/m3 during a rolling three-month averaging period evaluated overthree years. Table 1 shows lead values averaged over rollingthree-month periods at the Magna site (AIRS code: 49­ 035-1001) for the most recent three-year monitoring period (2002-2005). Each lead sample was collected over a 24-hour samplingperiod (from midnightto midnight) every sixth day at the site. On average, 15 samples were collected during each three-month averaging period. Magna is the only site where ambient lead concentrations were measured in the State's air monitoring network during the past five years. No additional lead monitoring data have been collected in the State by the EPA, local, ortribal agencies during this period and submitted to EPA's national database, AQS.

Table 1: Rolling Three-Month Averaged Lead Concentrations Measured at Magna Site from October 2002 to September 2005, in Jlg/m3

Period Pb Conc.* Period Pb Conc.* Period Pb Conc.* Aug-Oct 02 .03 Aug-Oct 03 .04 Aug-Oct 04 .02 Sep-Nov 02 .04 Sep-Nov 03 .04 Sep-Nov 04 .04 Oct-Dec 02 .04 Oct-Dec 03 .06 Oct-Dec 04 .06 Nov 02-Jan 03 .07 Nov 03-Jan 04 .07 Nov 04-Jan 05 .09 Dec 02-Feb 03 .07 Dec 03-Feb 04 .08 Dec 04-Feb 05 .10 Jan-Mar 03 .06 Jan-Mar 04 .07 Jan-Mar 05 .08 Feb-Apr 03 .03 Feb-Apr 04 .04 Feb-Apr 05 .05 Mar-May 03 .02 Mar-May 043. .04 Mar-May 05 .02
Apr-Jun 03 .02 Apr-Jun 04 .02 Apr-Jun 05 .02 May-Jul03 .02 May-Jul04 .02 May-Jul05 .02 Jun-Aug 03 .02 Jun-Aug 04 .02 Jun-Aug 05 .02 Jul-Sep 03 .02 Jul-Sep 04 .02 Jul-Sep 05 .02 

## * Three-month rolling averages are rounded to two decimal places as required by federal regulations.

None ofthese three-month rolling averages exceeds the revised lead standard. The highestthreemonth average occurred between December 2004 and February 2005 whenthe 15 collected samples averaged 0.1 OJlg/m3• 1989 was the last time an average lead level of0.15Jlg/m3was measured at the siteduring anythree-month period. The lead monitors were removed from Magna atthe end ofSeptember 2005 because ambient concentrations ofthe pollutantwere consistently low relative to the existing primary and secondary lead standards. Monthly lead concentrations had averaged less than one-tenth ofNAAQS over a IS-year monitoring period at the site (1990-2005). Nationally and locally, lead levels in the ambient airhave been reduced dramatically in the pastthree decades. UDAQ's former monitoring station in downtown Salt Lake City showed a 970/0 decrease in ambient air lead measured over an I8-year monitoring period (1982-1999), mirroring national trends. These dramatic reductions are attributable to EPA's lengthy regulatory efforts to remove lead from gasoline (1973-1996).