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    <dct:description>In August, 2003, a contaminants investigation was initiated at Grulla National Wildlife Refuge Grulla NWR by U.S. Fish and Wildlife Service personnel. The purpose of this investigation was to measure contaminant levels in the southwest portion of Grulla NWR to determine if contamination was migrating from the Arch Landfill into the Refuge, as well as determine the ecological significance of these contaminants. Surficial soils were collected from Grulla NWR and analyzed for metals, organochlorine pesticides, total polychlorinated biphenyls PCBs, and total petroleum hydrocarbons TPH. The resulting data were compared to baseline data collected during the same time frame from Muleshoe National Wildlife Refuge Muleshoe NWR and with available ecological screening criteria. The results of the metals analyses indicate that metals are present in surficial soils at higher levels at Muleshoe NWR than at Grulla NWR. Certain metals, primarily the metalloid boron, exceed ecological screening criteria at Muleshoe NWR, but this may be attributed to the natural alkaline soils at the refuge. The results of the organic analyses indicate that residual organochlorine pesticides, total PCBs, and TPH are present in surficial soils at very low levels at both refuges. As with the metals, the organics detected at Grulla NWR were lower than the levels measured at Muleshoe NWR. Overall, the contaminants detected at both refuges were below concentrations where adverse effects to ecological resources would be expected to occur.</dct:description>
        <dcat:keyword>environmental-contaminants-investigation</dcat:keyword>
        <dcat:keyword>metals</dcat:keyword>
        <dcat:keyword>mettaloid-boron</dcat:keyword>
        <dcat:keyword>natural-alkaline</dcat:keyword>
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        <dcat:keyword>petroleum-hydrocarbons</dcat:keyword>
        <dcat:keyword>surficial-soils</dcat:keyword>
        <dcat:keyword>total-polychlorinated-biphenyls</dcat:keyword>
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    <dct:title>Contaminants investigation at Grulla National Wildlife Refuge</dct:title>
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        <foaf:name>Richard Easterbrook</foaf:name>
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