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Monitoring of Diazinon Concentrations and Loadings, and Identification of Geographic Origins Consequent to Stormwater Runoff from Orchards in the Sacramento River Watershed, U.S.A.

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Abstract

Diazinon contamination of California's rivers has resulted in placing several rivers on the federal Clean Water Act § 303d list of impaired waterways. Impaired water body listing requiresthe development of Total Maximum Daily Loads (TMDL). Previous studies identified stormwater related diazinon pulses in California rivers. This study was conducted to monitor diazinonconcentrations in the Sacramento River watershed after rainfallevents, to ascertain whether pulses could be identified and, ifconcentrations of concern were observed, to estimate loadings anddetermine geographic origins of the insecticide. TMDL developmentrequires knowledge of contaminant sources, loadings, and geographic origins. Flow and diazinon concentrations peaked in the Sacramento River at Sacramento after the three largest stormsduring January and February 1994. Diazinon concentrations peakedconsequent to each of three storms. Diazinon concentrationsmeasured in the Sacramento River at Sacramento exceeded theCalifornia Department of Fish and Game acute and chroniccriteria for protection of aquatic life during January andFebruary for nine and nineteen days, respectively. Multipleexceedances were observed throughout the watershed. Diazinon loading and geographic origin differed with each of the three storms. The design of this study provides a useful template for others attempting to identify loadings and sources of contaminants in surface waters and to rectify aquatic ecosystemcontamination from various land use practices.

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Authors and Affiliations

  1. California Regional Water Quality Control Board, Central Valley Region, 3443 Routier Road, Suite A, Sacramento, California, U.S.A.

    Robert W. Holmes

  2. Aquatic Toxicology Laboratory, University of California Davis, 1321 Haring Hall, Davis, California, U.S.A

    Victor de Vlaming

Authors
  1. Robert W. Holmes
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  2. Victor de Vlaming
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Correspondence to Robert W. Holmes.

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Holmes, R.W., de Vlaming, V. Monitoring of Diazinon Concentrations and Loadings, and Identification of Geographic Origins Consequent to Stormwater Runoff from Orchards in the Sacramento River Watershed, U.S.A.. Environ Monit Assess 87, 57–79 (2003). https://doi.org/10.1023/A:1024437913245

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  • DOI: https://doi.org/10.1023/A:1024437913245

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