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    Relationship between Groundwater Nitrate Concentration and Density of Onsite Wastewater Treatment Systems: Role of Soil Parent Material and Impact on Pollution Risk

    Source: Journal of Sustainable Water in the Built Environment:;2024:;Volume ( 010 ):;issue: 003::page 04024003-1
    Author:
    Matthew J. Dowling
    ,
    Jose A. Amador
    ,
    Seaver Anderson
    ,
    Stefan Bengtson
    ,
    Kristen Hemphill
    ,
    George W. Loomis
    DOI: 10.1061/JSWBAY.SWENG-547
    Publisher: American Society of Civil Engineers
    Abstract: Nitrate (NO3−) pollution from onsite wastewater treatment systems (OWTS) is a concern in coastal communities that rely on groundwater for drinking water because of health risks associated with high levels of NO3− and the potential for eutrophication in areas where ground and surface water are connected. We examined the relationship between OWTS density and groundwater NO3− concentration in glacial soils with different parent material in a coastal watershed in the town of Charlestown, Rhode Island (USA). The area is underlain by glacial till and fluvial deposits, with groundwater as the only source of potable water and OWTS as the only means of treatment. The density of OWTS/ha was not significantly different between glacial fluvial (median=1.0; range, 0.04–4.8; n=207) and till (median=1.3; range, 0.012–3.81; n=160) soil parent material. Nitrate levels (mg N/L) in shallow well samples taken from 2013 to 2022 were significantly higher in till (median=3.7; range 0–15; n=160) than in glacial fluvial (median=2.7, range 0–9.7; n=207) parent material. Groundwater NO3− levels increased linearly with density of OWTS, and the slope (mg N · ha/L · OWTS) and intercept (mg N/L) values for the regression were significantly higher for till (0.99; 2.28) than glacial fluvial (0.66; 1.95) parent material. Regression intercept values >0.5  mg N/L, corresponding to a density of 0  OWTS/ha, point to widespread mixing of contaminated groundwater. Cumulative probability analysis showed that the proportion of samples with NO3− levels corresponding to Extreme pollution risk (>5  mg N/L) was much higher in till than in glacial fluvial parent material at the same OWTS densities. Fewer than 10% of the NO3− values were in the Low risk category (<0.5  mg N/L) regardless of OWTS density or parent material. Our results suggest that OWTS density and soil parent material should be part of the criteria for water management and land use decisions to protect public and environmental health.
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      Relationship between Groundwater Nitrate Concentration and Density of Onsite Wastewater Treatment Systems: Role of Soil Parent Material and Impact on Pollution Risk

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4298271
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    • Journal of Sustainable Water in the Built Environment

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    contributor authorMatthew J. Dowling
    contributor authorJose A. Amador
    contributor authorSeaver Anderson
    contributor authorStefan Bengtson
    contributor authorKristen Hemphill
    contributor authorGeorge W. Loomis
    date accessioned2024-12-24T10:05:11Z
    date available2024-12-24T10:05:11Z
    date copyright8/1/2024 12:00:00 AM
    date issued2024
    identifier otherJSWBAY.SWENG-547.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4298271
    description abstractNitrate (NO3−) pollution from onsite wastewater treatment systems (OWTS) is a concern in coastal communities that rely on groundwater for drinking water because of health risks associated with high levels of NO3− and the potential for eutrophication in areas where ground and surface water are connected. We examined the relationship between OWTS density and groundwater NO3− concentration in glacial soils with different parent material in a coastal watershed in the town of Charlestown, Rhode Island (USA). The area is underlain by glacial till and fluvial deposits, with groundwater as the only source of potable water and OWTS as the only means of treatment. The density of OWTS/ha was not significantly different between glacial fluvial (median=1.0; range, 0.04–4.8; n=207) and till (median=1.3; range, 0.012–3.81; n=160) soil parent material. Nitrate levels (mg N/L) in shallow well samples taken from 2013 to 2022 were significantly higher in till (median=3.7; range 0–15; n=160) than in glacial fluvial (median=2.7, range 0–9.7; n=207) parent material. Groundwater NO3− levels increased linearly with density of OWTS, and the slope (mg N · ha/L · OWTS) and intercept (mg N/L) values for the regression were significantly higher for till (0.99; 2.28) than glacial fluvial (0.66; 1.95) parent material. Regression intercept values >0.5  mg N/L, corresponding to a density of 0  OWTS/ha, point to widespread mixing of contaminated groundwater. Cumulative probability analysis showed that the proportion of samples with NO3− levels corresponding to Extreme pollution risk (>5  mg N/L) was much higher in till than in glacial fluvial parent material at the same OWTS densities. Fewer than 10% of the NO3− values were in the Low risk category (<0.5  mg N/L) regardless of OWTS density or parent material. Our results suggest that OWTS density and soil parent material should be part of the criteria for water management and land use decisions to protect public and environmental health.
    publisherAmerican Society of Civil Engineers
    titleRelationship between Groundwater Nitrate Concentration and Density of Onsite Wastewater Treatment Systems: Role of Soil Parent Material and Impact on Pollution Risk
    typeJournal Article
    journal volume10
    journal issue3
    journal titleJournal of Sustainable Water in the Built Environment
    identifier doi10.1061/JSWBAY.SWENG-547
    journal fristpage04024003-1
    journal lastpage04024003-11
    page11
    treeJournal of Sustainable Water in the Built Environment:;2024:;Volume ( 010 ):;issue: 003
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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