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Priority pollutant loads from effluent discharges to the San Francisco Estuary

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ABSTRACT:

Effluent monitoring data collected under the National Pollutant Discharge Elimination System (NPDES) Program were used to estimate pollutant loads from effluent discharges to the San Francisco Estuary for the period of 1984–1987. Most analyses of priority pollutant concentrations in effluents yielded “below detection limit” (BDL) results. Although many pollutants were monitored in effluents, quantitative assessment of spatial and temporal trends in loads could only be performed for four pollutants (chromium, copper, nickel, and zinc) that were detected in more than 50% of analyses. Four municipal wastewater treatment facilities accounted for approximately 50% of the total loads of these elements to the Estuary. Statistically significant declines in loads from some of the largest dischargers were observed. Modifications to procedures for collecting and reporting effluent monitoring data that would enhance the value of these data in assessments of mass loading include the use of more sensitive analytical methods for pollutants of greatest concern, increased sampling frequency for large discharges, routine reporting of B D L results in their uncensored form, and comprehensive reporting of quality assurance data.
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Keywords: NPDES; San Francisco; effluent loads; estuary; mass loading; monitoring; priority pollutants; trace elements

Document Type: Research Article

Publication date: 01 March 1992

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  • Water Environment Research (WER) is published monthly, including an annual Literature Review. A subscription to WER includes access to the latest content back to 1992, as well as access to fast track articles. An individual subscription is valid for 12 months from month of purchase.

    Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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