Bridgeton Landfill Air Monitoring

June 2013

Follow-Up Review of Air Monitoring Data

June 27-July 1, 2013

The Department of Health and Senior Services (DHSS) has reviewed air quality screening data collected by the Department of Natural Resources (DNR) at Bridgeton Landfill from the afternoon of June 27 to the afternoon of July 1, 2013. On June 7, DHSS began issuing follow-up reviews of the daily air quality screening data on a twice-weekly basis.

On April 23, DNR began routine, twice daily, surveillance of hydrogen sulfide, benzene, and odor levels around the entire periphery of the landfill. In addition, DNR has provided continuous monitoring of reduced sulfur compounds (reported as hydrogen sulfide), sulfur dioxide, carbon monoxide, and total volatile organic compounds (VOCs) at three fixed locations. DHSS has reviewed both sets of data to identify potential public health concerns for short-term health effects. Generally, samples are collected near the property boundary and dispersion is expected to reduce exposure downwind of the sample locations.

Odors

DNR reported moderate to strong odors at locations south and southeast of the landfill during this time period.

Hydrogen Sulfide and Other Reduced Sulfur Compounds

Hydrogen sulfide concentrations were well below levels of public health concern.

Sulfur Dioxide

Average sulfur dioxide concentrations were below levels of public health concern.

Benzene and Total VOCs

Benzene was not detected in ambient air at any of the surveillance locations around the landfill.

Carbon Monoxide

Average carbon monoxide concentrations were well below levels of public health concern.

Radiation Rates

Gamma radiation rates were well below levels of public health concern.

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June 27, 2013

The Department of Health and Senior Services (DHSS) has reviewed air sample data collected for the Department of Natural Resources (DNR) near Bridgeton Landfill June 27, 2013. Samples were collected at two locations upwind of the landfill and two locations downwind of the landfill for laboratory determination of concentrations of volatile organic compounds (VOCs), aldehydes, reduced sulfur compounds and sulfur dioxide. DHSS has reviewed this data for evaluation of potential public health concerns of short-term health effects.

VOCs

Concentrations of VOCs were well below levels of public health concern. Downwind of the landfill, 24 VOCs were detected in ambient air in concentrations that generally exceeded concentrations detected upwind of the landfill. However, these concentrations, which ranged from 0.1 parts per billion (ppb) to 25.7 ppb, did not exceed health-based screening levels for acute exposure.

Aldehydes

Concentrations of aldehydes were well below levels of public health concern. Downwind of the landfill, 9 aldehydes were detected, which ranged in concentration from 0.11 ppb to 2.65 ppb and did not exceed health-based screening levels for acute exposure.

Reduced Sulfur Compounds

Reduced sulfur compounds were not detected in any of the samples. While low concentrations of hydrogen sulfide were detected by the Jerome meter in downwind locations on the same day, those concentrations were less than the detection limit of the laboratory analysis. During the 4-hour sample collection period, reduced sulfur compounds were also detected by the AreaRAE monitor located in the nearby downwind location. However, those were total reduced sulfur compound concentrations. Concentrations of individual compounds were apparently less than the detection limit of the laboratory analysis.

Sulfur Dioxide

Sulfur dioxide was detected in an upwind sample location. DHSS identified a concentration of 45 ppb from one upwind air sample collected for a four-hour time period west of the landfill that exceeded a health-based screening level for acute exposures lasting up to two weeks (10 ppb). Concentrations that exceed this screening level may cause irritation or respiratory effects in asthmatics or other sensitive individuals; however, it should be noted that concentrations above a screening level do not necessarily identify a public health risk is present, but that further investigation is warranted. While this concentration of sulfur dioxide was above the acute screening level for exposures lasting up to two weeks, it did not exceed the acute screening level for sulfur dioxide protective for exposures lasting up to eight hours (200 ppb) or the 1-hour or 3-hour National Ambient Air Quality Standards (75 ppb and 500 ppb, respectively).

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June 24-27, 2013

The Department of Health and Senior Services (DHSS) has reviewed air quality screening data collected by the Department of Natural Resources (DNR) at Bridgeton Landfill from the afternoon of June 24 to the afternoon of June 27, 2013. On June 7, DHSS began issuing follow-up reviews of the daily air quality screening data on a twice-weekly basis.

On April 23, DNR began routine, twice daily, surveillance of hydrogen sulfide, benzene, and odor levels around the entire periphery of the landfill. In addition, DNR has provided continuous monitoring of reduced sulfur compounds (reported as hydrogen sulfide), sulfur dioxide, carbon monoxide, and total volatile organic compounds (VOCs) at three fixed locations. DHSS has reviewed both sets of data to identify potential public health concerns for short-term health effects. Generally, samples are collected near the property boundary and dispersion is expected to reduce exposure downwind of the sample locations.

Odors

DNR reported moderate to strong odors at various locations north, northeast, and east of the landfill during this time period.

Hydrogen Sulfide and Other Reduced Sulfur Compounds

Hydrogen sulfide concentrations were well below levels of public health concern.

Sulfur Dioxide

Average sulfur dioxide concentrations were below levels of public health concern.

Benzene and Total VOCs

Benzene was not detected in ambient air at any of the surveillance locations around the landfill.

Carbon Monoxide

Average carbon monoxide concentrations were well below levels of public health concern.

Radiation Rates

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June 20-24, 2013

The Department of Health and Senior Services (DHSS) has reviewed air quality screening data collected by the Department of Natural Resources (DNR) at Bridgeton Landfill from the afternoon of June 20 to the afternoon of June 24, 2013. On June 7, DHSS began issuing follow-up reviews of the daily air quality screening data on a twice-weekly basis.

On April 23, DNR began routine, twice daily, surveillance of hydrogen sulfide, benzene, and odor levels around the entire periphery of the landfill. In addition, DNR has provided continuous monitoring of reduced sulfur compounds (reported as hydrogen sulfide), sulfur dioxide, carbon monoxide, and total volatile organic compounds (VOCs) at three fixed locations. DHSS has reviewed both sets of data to identify potential public health concerns for short-term health effects. Generally, samples are collected near the property boundary and dispersion is expected to reduce exposure downwind of the sample locations.

Odors

DNR reported moderate to strong odors at various locations north, northeast, and east of the landfill during this time period. Winds were predominantly from the south and southwest.

Hydrogen Sulfide and Other Reduced Sulfur Compounds

Hydrogen sulfide concentrations were well below levels of public health concern.

Sulfur Dioxide

Average sulfur dioxide concentrations were below levels of public health concern, except for several hours at one monitoring location near the landfill.

Benzene and Total VOCs

Benzene was not detected in ambient air at any of the surveillance locations around the landfill.

Carbon Monoxide

Average carbon monoxide concentrations were well below levels of public health concern.

Radiation Rates

Gamma radiation rates were well below levels of public health concern.

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June 3, 2013 DHSS Review of Air Sample Data from the Bridgeton Landfill Area

The Department of Health and Senior Services (DHSS) has reviewed air sample data collected for the Department of Natural Resources (DNR) near Bridgeton Landfill on June 3, 2013. Samples were collected at one location upwind of the landfill and three locations downwind of the landfill for laboratory determination of concentrations of volatile organic compounds (VOCs), aldehydes, and reduced sulfur compounds. DHSS has reviewed this data for evaluation of potential public health concerns of short-term health effects.

VOCs

Concentrations of VOCs were well below levels of public health concern. Downwind of the landfill, 20 VOCs were detected in ambient air, which ranged in concentration from 0.08 parts per billion (ppb) to 20.6 ppb and did not exceed health-based screening levels for acute exposure.

Aldehydes

Concentrations of aldehydes were well below levels of public health concern. Downwind of the landfill, six aldehydes were detected, which ranged in concentration from 0.17 ppb to 1.89 ppb and did not exceed health-based screening levels for acute exposure.

Reduced Sulfur Compounds

Individual reduced sulfur compounds were not detected in any of the air samples. While low concentrations of hydrogen sulfide were detected during the daily monitoring by the Jerome meter in downwind locations on the same day, those concentrations were less than the detection limit of the laboratory analysis for hydrogen sulfide. Additionally, while low concentrations of reduced sulfur compounds were detected during the daily monitoring by AreaRAE monitors located in the nearby downwind locations on the same day, the laboratory analysis for the individual compounds did not confirm these detections.

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April 16, May 7, and May 8 Comprehensive Air Sampling at Bridgeton Landfill

The Missouri Department of Health and Senior Services (DHSS) has reviewed the air sample data from the April 16, May 7, and May 8 comprehensive sampling event at Bridgeton Landfill. DHSS evaluated air samples collected from two on-site locations and from three locations upwind and three locations downwind from the site. DHSS reviewed the data for evaluation of potential public health concerns of short-term health effects.

Samples were collected for aldehydes, amines, ammonia, carboxylic acids, hydrogen chloride, hydrogen cyanide, mercury (elemental), sulfur dioxide, dioxins/furans, polynuclear aromatic hydrocarbons (PAHs), volatile organic compounds (VOCs), and reduced sulfur compounds. Of these, only aldehydes, carboxylic acids, dioxins/furans, PAHs, and VOCs were detected in the samples.

Aldehydes

Aldehydes were detected on-site, upwind, and downwind of the landfill; however, all concentrations were below levels of public health concern.

Carboxylic Acids

Carboxylic acids were detected in one on-site sample; however, concentrations were below levels of public health concern and were not detected in ambient air downwind of the landfill.

Dioxins/Furans

Dioxins and furans were detected on-site, upwind, and downwind of the landfill; however, all concentrations were below levels of public health concern.

PAHs

PAHs were detected on-site, upwind, and downwind of the landfill; however, the concentrations were low and are not expected to pose a public health risk.

VOCs

VOCs were detected on-site, upwind, and downwind of the landfill. All concentrations of VOCs were below acute screening levels except benzene, which was above an acute screening level, but is not expected to pose a public health risk.

It should also be noted that benzene is an important component of gasoline and this sample was collected near an automotive shop, which may have contributed to the detection of benzene. The other downwind air sample collected on that day did not show a concentration of benzene above an acute screening level.

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June 17 - 20, 2013

The Department of Health and Senior Services (DHSS) has reviewed air quality screening data collected by the Department of Natural Resources (DNR) at Bridgeton Landfill from the afternoon of June 17 to the afternoon of June 20, 2013. On June 7, DHSS began issuing follow-up reviews of the daily air quality screening data on a twice-weekly basis.

On April 23, DNR began routine, twice daily, surveillance of hydrogen sulfide, benzene, and odor levels around the entire periphery of the landfill. In addition, DNR has provided continuous monitoring of reduced sulfur compounds (reported as hydrogen sulfide), sulfur dioxide, carbon monoxide, and total volatile organic compounds (VOCs) at three fixed locations. DHSS has reviewed both sets of data to identify potential public health concerns for short-term health effects. Generally, samples are collected near the property boundary and dispersion is expected to reduce exposure downwind of the sample locations.

Odors

DNR reported moderate to strong odors at various locations south, southwest, and east of the landfill during this time period, depending on wind direction. Winds were predominantly from the south and southwest on June 17 and 20, from the north and northwest on June 18, and from the east and northeast on June 19.
The DNR contractor detected moderate odors east of the landfill on June 17, moderate odors east and south of the landfill on June 18, and moderate to strong odors east, west, and south of the landfill on June 19 using a Nasal Ranger olfactometer.

Hydrogen Sulfide and Other Reduced Sulfur Compounds

Hydrogen sulfide concentrations were well below levels of public health concern.

Sulfur Dioxide

Average sulfur dioxide concentrations were below levels of public health concern, except for several hours at two monitoring locations near the landfill.

Benzene and Total VOCs

Benzene was not detected in ambient air at any of the surveillance locations around the landfill.

Carbon Monoxide

Average carbon monoxide concentrations were well below levels of public health concern.

Radiation Rates

Gamma radiation rates were well below levels of public health concern.

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June 18, 2013

The Department of Health and Senior Services (DHSS) has reviewed air sample data collected for the Department of Natural Resources (DNR) near Bridgeton Landfill June 18, 2013. Samples were collected at two locations upwind of the landfill and two locations downwind of the landfill for laboratory determination of concentrations of volatile organic compounds (VOCs), aldehydes, and reduced sulfur compounds. DHSS has reviewed this data for evaluation of potential public health concerns of short-term health effects.

VOCs

Concentrations of VOCs were well below levels of public health concern. Downwind of the landfill, 26 VOCs were detected in ambient air in concentrations that generally exceeded concentrations detected upwind of the landfill. However, these concentrations, which ranged from 0.07 parts per billion (ppb) to 70.1 ppb, did not exceed health-based screening levels for acute exposure.

Aldehydes

Concentrations of aldehydes were well below levels of public health concern. Downwind of the landfill, 8 aldehydes were detected, which ranged in concentration from 0.135 ppb to 2.01 ppb and did not exceed health-based screening levels for acute exposure.

Reduced Sulfur Compounds

Reduced sulfur compounds were not detected in any of the samples. While low concentrations of hydrogen sulfide were detected by the Jerome meter in downwind locations on the same day, those concentrations were less than the detection limit of the laboratory analysis. During the 4-hour sample collection period, reduced sulfur compounds were also detected by the AreaRAE monitor located in the nearby downwind location. However, those were total reduced sulfur compound concentrations. Concentrations of individual compounds were apparently less than the detection limit of the laboratory analysis.

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June 13 - 17, 2013

The Department of Health and Senior Services (DHSS) has reviewed air quality screening data collected by the Department of Natural Resources (DNR) at Bridgeton Landfill from the afternoon of June 13 to the afternoon of June 17, 2013. On April 23, DNR began routine, twice daily, surveillance of hydrogen sulfide, benzene, and odor levels around the entire periphery of the landfill. In addition, DNR has provided continuous monitoring of reduced sulfur compounds (reported as hydrogen sulfide), sulfur dioxide, carbon monoxide, and total volatile organic compounds (VOCs) at three fixed locations. DHSS has reviewed both sets of data to identify potential public health concerns for short-term health effects. Generally, samples are collected near the property boundary and dispersion is expected to reduce exposure downwind of the sample locations.

Odors

DNR reported low and moderate to strong odors at various locations north, northwest, south, and east of the landfill during this time period, depending on wind direction. Winds were predominantly from the northwest on June 13 and from the south and southwest on June 14-17.

Hydrogen Sulfide and Other Reduced Sulfur Compounds

Hydrogen sulfide concentrations were well below levels of public health concern.

Sulfur Dioxide

Average sulfur dioxide concentrations were well below levels of public health concern.

Benzene and Total VOCs

Benzene was not detected in ambient air at any of the surveillance locations around the landfill.

Carbon Monoxide

Average carbon monoxide concentrations were well below levels of public health concern.

Radiation Rates

Gamma radiation rates were well below levels of public health concern.

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June 17 - 18, 2013

The Missouri Department of Health and Senior Services (DHSS) has reviewed the air sample data from the June 17-18 sampling event at Bridgeton Landfill. Samples were collected from one on-site location and from one location upwind and one location downwind of the landfill for laboratory determination of concentrations of dioxins/furans and polynuclear aromatic hydrocarbons (PAHs). DHSS reviewed the data for evaluation of potential public health concerns of short-term health effects.

Dioxins/Furans

Dioxins and furans were detected on-site, upwind, and downwind of the landfill; however, all concentrations were below levels of public health concern.

PAHs

PAHs were detected on-site, upwind, and downwind of the landfill; however, the concentrations were low and are not expected to pose a public health risk.

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June 13, 2013

The Department of Health and Senior Services (DHSS) has reviewed air sample data collected for the Department of Natural Resources (DNR) near Bridgeton Landfill June 13, 2013. Samples were collected at one location upwind of the landfill and three locations downwind of the landfill for laboratory determination of concentrations of volatile organic compounds (VOCs), aldehydes, and reduced sulfur compounds. DHSS has reviewed this data for evaluation of potential public health concerns of short-term health effects.

VOCs

Concentrations of VOCs were well below levels of public health concern. Downwind of the landfill, 26 VOCs were detected in ambient air in concentrations that generally exceeded concentrations detected upwind of the landfill. However, these concentrations, which ranged from 0.09 parts per billion (ppb) to 49 ppb, did not exceed health-based screening levels for acute exposure.

Aldehydes

Concentrations of aldehydes were well below levels of public health concern. Downwind of the landfill, 8 aldehydes were detected, which ranged in concentration from 0.088 ppb to 1.03 ppb and did not exceed health-based screening levels for acute exposure.

Reduced Sulfur Compounds

Reduced sulfur compounds were not detected in any of the samples.  While low concentrations of hydrogen sulfide were detected by the Jerome meter in downwind locations on the same day, those concentrations were less than the detection limits of the laboratory analysis. During the 4-hour sample collection period, reduced sulfur compounds were also not detected by the AreaRAE monitor located in nearby downwind locations.

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June 10 - 13, 2013

The Department of Health and Senior Services (DHSS) has reviewed air quality screening data collected by the Department of Natural Resources (DNR) at Bridgeton Landfill from the afternoon of June 10 to the afternoon of June 13, 2013. On April 23, DNR began routine, twice daily, surveillance of hydrogen sulfide, benzene, and odor levels around the entire periphery of the landfill. In addition, DNR has provided continuous monitoring of reduced sulfur compounds (reported as hydrogen sulfide), sulfur dioxide, carbon monoxide, and total volatile organic compounds (VOCs) at three fixed locations. DHSS has reviewed both sets of data to identify potential public health concerns for short-term health effects. Generally, samples are collected near the property boundary and dispersion is expected to reduce exposure downwind of the sample locations.

Odors

DNR reported moderate to moderate to strong odors at various locations north, south, and east of the landfill during this time period, depending on wind direction. Winds were predominantly from the northwest on June 10 and 13 and from the south on June 11-12.

Hydrogen Sulfide and Other Reduced Sulfur Compounds

Hydrogen sulfide concentrations were well below levels of public health concern.

Sulfur Dioxide

Average sulfur dioxide concentrations were well below levels of public health concern, except for a limited time period at one monitoring location near the landfill.

Benzene and Total VOCs

Benzene was not detected in ambient air at any of the surveillance locations around the landfill.

Carbon Monoxide

Average carbon monoxide concentrations were well below levels of public health concern.

Radiation Rates

Gamma radiation rates were well below levels of public health concern.

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June 6 - 10, 2013

The Department of Health and Senior Services (DHSS) has reviewed air quality screening data collected by the Department of Natural Resources (DNR) at Bridgeton Landfill from the afternoon of June 6 to the afternoon of June 10, 2013. On April 23, DNR began routine, twice daily surveillance of hydrogen sulfide, benzene, and odor levels around the entire periphery of the landfill. In addition, DNR has provided continuous monitoring of reduced sulfur compounds (reported as hydrogen sulfide), sulfur dioxide, carbon monoxide, total volatile organic compounds (VOCs) and gamma radiation at three fixed locations. DHSS has reviewed both sets of data to identify potential public health concerns for short-term health effects. Generally, samples are collected near the property boundary and dispersion is expected to reduce exposure downwind of the sample locations.

Odors

DNR reported moderate to strong odors at various locations north, south, and east of the landfill during this time period, depending on wind direction.

Hydrogen Sulfide and Other Reduced Sulfur Compounds

Hydrogen sulfide concentrations were well below levels of public health concern.

Sulfur Dioxide

Average sulfur dioxide concentrations were well below levels of public health concern.

Benzene and Total VOCs

Benzene was not detected in ambient air at any of the surveillance locations around the landfill.

Carbon Monoxide

Average carbon monoxide concentrations were well below levels of public health concern.

Radiation Rates

Gamma radiation rates were well below levels of public health concern.

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June 4 - 6, 2013

The Department of Health and Senior Services (DHSS) has reviewed air quality screening data collected by the Department of Natural Resources (DNR) at Bridgeton Landfill from the afternoon of June 4 to the afternoon of June 6, 2013. On April 23, DNR began routine, twice daily surveillance of hydrogen sulfide, benzene, and odor levels around the entire periphery of the landfill. In addition, DNR has provided continuous monitoring of reduced sulfur compounds (reported as hydrogen sulfide), sulfur dioxide, carbon monoxide, total volatile organic compounds (VOCs) and gamma radiation at three fixed locations. DHSS has reviewed both sets of data to identify potential public health concerns for short-term health effects. Generally, samples are collected near the property boundary and dispersion is expected to reduce exposure downwind of the sample locations.

Odors

Odors were reported by DNR as being strong the afternoon of June 4 and moderate on June 5 at locations southwest of the landfill.

Hydrogen Sulfide and Other Reduced Sulfur Compounds

Hydrogen sulfide concentrations were well below levels of public health concern.

Sulfur Dioxide

Average sulfur dioxide concentrations did not exceed levels of public health concern.

Benzene and Total VOCs

Benzene was not detected in ambient air at any of the surveillance locations around the landfill.

Carbon Monoxide

Average carbon monoxide concentrations were well below levels of public health concern.

Radiation Rates

Gamma radiation rates were well below levels of public health concern.

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June 4, 2013

The Department of Health and Senior Services (DHSS) has reviewed air quality screening data collected by the Department of Natural Resources (DNR) at Bridgeton Landfill from the afternoon of June 3 to the afternoon of June 4, 2013. On April 23, DNR began routine, twice daily, surveillance of hydrogen sulfide, benzene, and odor levels around the entire periphery of the landfill. In addition, DNR has provided continuous monitoring of reduced sulfur compounds (reported as hydrogen sulfide), sulfur dioxide, carbon monoxide, and total volatile organic compounds (VOCs) at three fixed locations. DHSS has reviewed both sets of data to identify potential public health concerns for short-term health effects. Generally, samples are collected near the property boundary and dispersion is expected to reduce exposure downwind of the sample locations.

Odors

Odors were reported by DNR as being strong today at locations southwest the landfill. Winds were variable, predominantly from the south and east.

Hydrogen Sulfide and Other Reduced Sulfur Compounds

Hydrogen sulfide concentrations were well below levels of public health concern.

Sulfur Dioxide

Sulfur dioxide was not detected in ambient air at any of the monitoring locations near the landfill.

Benzene and Total VOCs

Benzene was not detected in ambient air at any of the surveillance locations around the landfill.

Carbon Monoxide

Average carbon monoxide concentrations were well below levels of public health concern.

Radiation Rates

Gamma radiation rates continue to be at levels that are at or near natural background levels.

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June 3, 2013

The Department of Health and Senior Services (DHSS) has reviewed air quality screening data collected by the Department of Natural Resources (DNR) at Bridgeton Landfill from the afternoon of June 2 to the afternoon of June 3, 2013. On April 23, DNR began routine, twice daily, surveillance of hydrogen sulfide, benzene, and odor levels around the entire periphery of the landfill. In addition, DNR has provided continuous monitoring of reduced sulfur compounds (reported as hydrogen sulfide), sulfur dioxide, carbon monoxide, and total volatile organic compounds (VOCs) at three fixed locations. DHSS has reviewed both sets of data to identify potential public health concerns for short-term health effects. Generally, samples are collected near the property boundary and dispersion is expected to reduce exposure downwind of the sample locations.

Odors

Odors were reported by DNR as being very strong in the morning today, especially at locations south and southwest the landfill. Winds were light and variable, although predominantly from the north-northwest and northeast.

Hydrogen Sulfide and Other Reduced Sulfur Compounds

Hydrogen sulfide concentrations were well below levels of public health concern.

Sulfur Dioxide

Average sulfur dioxide concentrations did not exceed levels of public health concern, except for a limited time period at one monitoring location near the landfill.

Benzene and Total VOCs

Benzene was detected in low concentrations in ambient air in several locations, mostly south of the landfill.

Carbon Monoxide

Average carbon monoxide concentrations were well below levels of public health concern.

Radiation Rates

Gamma radiation rates continue to be at levels that are at or near natural background levels.

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June 1-2, 2013

The Department of Health and Senior Services (DHSS) has reviewed air quality screening data collected by the Department of Natural Resources (DNR) at Bridgeton Landfill from the afternoon of May 31 to the afternoon of June 2, 2013, while construction work at the landfill was temporarily suspended due to adverse weather conditions. On April 23, DNR began routine, twice daily, surveillance of hydrogen sulfide, benzene, and odor levels around the entire periphery of the landfill. In addition, DNR has provided continuous monitoring of reduced sulfur compounds (reported as hydrogen sulfide), sulfur dioxide, carbon monoxide, and total volatile organic compounds (VOCs) at three fixed locations. DHSS has reviewed both sets of data to identify potential public health concerns for short-term health effects. Generally, samples are collected near the property boundary and dispersion is expected to reduce exposure downwind of the sample locations.

Odors

Odors were reported by DNR as being moderate to strong at locations south and southeast the landfill on Sunday, June 2. Winds were predominantly from the north-northwest on that day.

Hydrogen Sulfide and Other Reduced Sulfur Compounds

Hydrogen sulfide concentrations were well below levels of public health concern.

Sulfur Dioxide

Average sulfur dioxide concentrations did not exceed levels of public health concern, except for a limited time period at one monitoring location near the landfill.

Benzene and Total VOCs

Benzene was not detected in ambient air at any of the surveillance locations around the landfill.

Carbon Monoxide

Average carbon monoxide concentrations were well below levels of public health concern.

Radiation Rates

Gamma radiation rates continue to be at levels that are at or near natural background levels.

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