Atmospheric Mercury in the Guadalupe Watershed Andy Lincoff Peter Husby Barbara Bates US EPA Region 9 Laboratory Richmond, CA Richmond, CA.

Atmospheric Mercury in Atmospheric Mercury in the Guadalupe the Guadalupe WatershedWatershed

Andy LincoffAndy Lincoff

Peter HusbyPeter Husby

Barbara BatesBarbara Bates

US EPA Region 9 LaboratoryUS EPA Region 9 Laboratory

Richmond, CARichmond, CA

What I Will Cover……..What I Will Cover……..

Description of USEPA R9 Laboratory Hg Description of USEPA R9 Laboratory Hg TrailerTrailer

Description of Total, Speciation and Description of Total, Speciation and Particulate Hg analysisParticulate Hg analysis

Mercury Monitoring Associated with a Mercury Monitoring Associated with a remediation site near the USEPA R9 remediation site near the USEPA R9 LaboratoryLaboratory

Atmospheric Mercury Speciation in Atmospheric Mercury Speciation in Guadalupe WatershedGuadalupe Watershed

Atmospheric Mercury Vapor Atmospheric Mercury Vapor Monitoring InstrumentationMonitoring Instrumentation Tekran Model 2537ATekran Model 2537A Continuous Analysis Continuous Analysis

of total gaseous Hgof total gaseous Hg Sub ng/m3 (ppt & Sub ng/m3 (ppt &

ppq) levels measuredppq) levels measured Detection with Cold Detection with Cold

Vapor Atomic Vapor Atomic Fluorescence Fluorescence Spectrometry Spectrometry (CVAFS)(CVAFS)

Tekran 2537A FlowTekran 2537A Flow

Tekran 1130 & 1135 UnitsTekran 1130 & 1135 Units

Particulate Hg and Hg Speciation Particulate Hg and Hg Speciation ComponentsComponents

System Flow Diagram

Additional parameter Additional parameter monitoringmonitoring

Criteria air pollutants: NOx, SOx, Ozone, Criteria air pollutants: NOx, SOx, Ozone, COCO

Meteorological measurements: Meteorological measurements: temperature, wind speed and direction, temperature, wind speed and direction, relative humidity, rainfall, solar radiation, relative humidity, rainfall, solar radiation, barometric pressure, associated calculated barometric pressure, associated calculated valuesvalues

All instruments run continuously, logging All instruments run continuously, logging at five minute intervals – or time scale of at five minute intervals – or time scale of interest.interest.

Monitoring elemental Monitoring elemental mercury at a remediation mercury at a remediation sitesite

First use of instrumentation in the First use of instrumentation in the Bay AreaBay Area

Monitoring of elemental mercury Monitoring of elemental mercury adjacent to a remediation site in adjacent to a remediation site in Richmond, CARichmond, CA

USEPA Region 9 USEPA Region 9 LaboratoryLaboratory

EPA

Met Tower

August 26 – 30, 2003August 26 – 30, 2003

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September 7 – 13, 2003September 7 – 13, 2003

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Monitoring in support of Monitoring in support of the Guadalupe Watershed the Guadalupe Watershed TMDLTMDL

Plan was to deploy monitoring trailer Plan was to deploy monitoring trailer at four locations in the watershed – at at four locations in the watershed – at least twice, once in the fall and once least twice, once in the fall and once during the wet season.during the wet season.

Actually we collected data at two Actually we collected data at two locations during September.locations during September.

If there is still interest we will deploy If there is still interest we will deploy again in April at up to 4 locations.again in April at up to 4 locations.

NASA Ames

Calero Reservoir

NASA Ames, Sunnyvale, NASA Ames, Sunnyvale, CACA

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Calero Reservoir, CACalero Reservoir, CA

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Elemental Mercury

Particulate

Reactive

Summary of Mercury Summary of Mercury ConcentrationsConcentrations

Mercury Concentrations – September 2005

NASA Ames MDN

8/30 – 9/9/05

NASA Ames MDN

8/30 – 9/9/05

Calero Reservoir

9/9 – 27/05

Calero Reservoir

9/9 – 27/05

Mean Median Mean Median

Elemental Mercury (ng/m3)

1.909 1.736 1.940 1.780

Particulate Mercury (pg/m3)

2.732 1.803 3.665 2.811

Reactive Mercury (pg/m3)

1.528 0.837 4.528 1.448

n 74 74 140 140

Comparison to SFEI 2001 Comparison to SFEI 2001 datadata

SFEI study found Hg (0) ranged from SFEI study found Hg (0) ranged from 1.5 – 4.2 ng/m1.5 – 4.2 ng/m33

SFEI did not measure Hg (p) or RGM, SFEI did not measure Hg (p) or RGM, but used 95% Hg(0):3% but used 95% Hg(0):3% Hg(p):2%RGMHg(p):2%RGM

Our limited data show similar Hg(0) Our limited data show similar Hg(0) ranges, 1.2 – 3.9 ng/mranges, 1.2 – 3.9 ng/m33

The percent of Hg (p) and RGM were The percent of Hg (p) and RGM were consistently ~ 1 % of Hg(0).consistently ~ 1 % of Hg(0).

Next StepsNext Steps

Complete additional data analysisComplete additional data analysis Complete monitoring during other Complete monitoring during other

seasons (seasons (e.g.e.g. winter) winter) Identify quality control for Hg(p) Identify quality control for Hg(p)

and RGM and RGM Identify Additional ProjectsIdentify Additional Projects