Comparison of pollutant concentrations from weekly discrete versus composite samples for residential dry-weather runoff
| Autor: | Steven E. Greco, Eric Lee, L.L. Dodge, T.J. Majcherek, Jay Gan, Lorence R. Oki, Bruno J. L. Pitton, Darren Haver |
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| Rok vydání: | 2016 |
| Předmět: |
Environmental Engineering
Rain Sample (material) 0208 environmental biotechnology 02 engineering and technology STREAMS 010501 environmental sciences Management Monitoring Policy and Law 01 natural sciences California chemistry.chemical_compound Nitrate Water Movements Weather Waste Management and Disposal Permethrin 0105 earth and related environmental sciences Total suspended solids Pollutant Hydrology Nitrates Urbanization Sampling (statistics) Phosphorus General Medicine Carbon 020801 environmental engineering chemistry Pyrazoles Environmental science Seasons Sample collection Surface runoff Water Pollutants Chemical Environmental Monitoring |
| Zdroj: | Journal of Environmental Management. 180:10-16 |
| ISSN: | 0301-4797 |
| Popis: | As urbanization has increased, so has degradation of urban streams. Urban water quality monitoring has focused on storm runoff sampling, but in arid climates, dry-weather runoff is a significant contributor of pollutants to aquatic systems. The majority of dry-weather runoff studies sample a small window of the entire dry-season. For this study constituent concentrations were compared using two sampling protocols. The first protocol repeatedly collected samples on the same day of the week at the same time of day. The second protocol collected samples during two week-long intensive sampling events consisting of sample collection every hour for 24 h for seven consecutive days. The two protocols were compared to determine if sampling at the same time of the week was representative of the entire week. For nitrate, total phosphorous, fipronil, permethrin, total organic carbon, and total suspended solids, sampling at the same time was not representative of the weekly mean; however, variability was observed between sites and constituents. For those constituent concentrations with significant differences seen between the two protocols, load adjustment factors (LAF) were determined, using a ratio of treatment means, and employed to adjust dry-season load estimates. Future work should include determining if LAF values can be used at similar sites excluded from the study or for similar constituents from the current sampling sites. |
| Databáze: | OpenAIRE |
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