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Person

David A Alvarez

Supervisory Research Chemist
Email: dalvarez@usgs.gov
Office Phone: 573-441-2970
Fax: 573-876-1896
ORCID: 0000-0002-6918-2709

Location
4200 New Haven Road
Columbia , MO 65201
US
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This dataset includes pesticides and pesticide transformation products in 15 tributaries of the Great Lakes. Pesticides were monitored using polar organic chemical integrative samplers (POCIS) to estimate concentrations in water following standard protocols (Alvarez, 2010) in June and July 2016. POCIS extracts were analyzed for 225 chemicals (USGS National Water Quality Laboratory schedule 5437, Sandstrom and others, 2016), for which 129 chemicals also have POCIS uptake rates, allowing calculations of time-weighted mean concentration over the approximately 30 day deployment (Alvarez and others, 2008). Collectively, there were 97 chemicals detected, and time-weighted mean concentrations could be calculated for 95...
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This is a collection of data on the contamination of water, fish, and sediments in Biscayne National Park and in canals that discharge into the national park. The water data are estimations of their concentrations in water based on sampling with passive water samplers (semi-permeable membrane devices and polar organic chemical integrative samplers). Also in this data set are estrogen equivalencies for the chemical mixtures in the polar organic chemical integrative samplers.
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The Geneva Industries/Fuhrmann Energy Superfund Site (hereinafter referred to as "the Site") in southeastern Houston, Texas was historically used as a site for petroleum exploration and petrochemical production and is currently (2024) inactive. Previous remedies to clean up the contaminated site included the excavation and off-site disposal of polychlorinated biphenyl (PCB)-contaminated soils, capping the Site and surrounding it with a perimeter slurry wall to contain remaining constituents in the soil and groundwater, the recovery and treatment of trichloroethylene (TCE)-contaminated groundwater, and institutional controls (U.S. Environmental Protection Agency [EPA], 2018). A conceptual site model (CSM) does not...
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Background Industrial discharges of toxic and bio-accumulating compounds to the Niagara River and its tributaries have occurred over many decades. High concentrations of polychlorinated biphenyls (PCBs) have been found in samples of fish tissue from many locations, including three tributaries to the Niagara River: Tonawanda Creek, Two mile Creek, and Rattlesnake Creek (study reaches listed in Table 1). Study site for SPMD sampler in a tributary to the Niagara River High PCB concentrations have also been found in mussel tissues during in situ experiments in the latter two creeks PCBs have been detected in sediments from many locations, but they were generally lower than expected given the elevated PCB concentrations...
Water-borne polychlorinated biphenyls (PCBs) were sampled in three tributaries of the Niagara River Area of Concern (AOC) in 2018 and 2019 using semipermeable membrane devices (SPMDs). This data set is a compilation of data from two sampling efforts, focused on determining the presence and distribution of total and congener PCBs in these tributaries.
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