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| Title | DDT Sources to the Okanogan River and Lake Osoyoos. Memo to Jim Milton, Central Regional Office. | |||
| Month-Year Published | December 1997 | |||
| Online Availability |
711 kilobytes, requires version 4.0 or later of Adobe Acrobat Reader Software get Acrobat Reader
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| Short Description |
DDT and/or its breakdown products DDE and DDD were detected in seven of twelve Okanogan River/Lake Osoyoos tributaries sampled in July - August 1995. Concentrations substantially exceeded the state chronic surface water quality standard of 0.001 ug/L (parts per billion) in Tallant Creek (0.19 - 0.50), Nine-Mile Creek (0.0054 - 0.0064) and an un-named creek in Omak (0.0055 - 0.0080). Except for Tallant Creek, these concentrations are similar to other state waters contaminated with DDT from historical use. (Also see abstract below) | |||
| Publication Number | 97-e09 | |||
| Author(s) | Johnson, A., D. Serdar, and D. Davis | |||
| Print Availability |
Not maintained in stock. Copy must be made from archive version.
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| Number of pages | 32 pp. | |||
| Keywords | bill, creek, DDT, flow, lake, Okanogan River, river, water, water quality | |||
| Subject Waterbodies |
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| Abstract | Long Description |
DDT and/or its breakdown products DDE and DDD were detected in seven of twelve Okanogan River/Lake Osoyoos tributaries sampled in July - August 1995. Concentrations substantially exceeded the state chronic surface water quality standard of 0.001 ug/L (parts per billion) in Tallant Creek (0.19 - 0.50), Nine-Mile Creek (0.0054 - 0.0064) and an un-named creek in Omak (0.0055 - 0.0080). Except for Tallant Creek, these concentrations are similar to other state waters contaminated with DDT from historical use. Under the low flow conditions surveyed, the load of total DDT compounds (DDT + DDE + DDD) to the river was estimated at about 0.3 gram/day, Tallant Creek being the major contributor. Field observations suggest the survey included most of the tributary inflows at this time of year. |
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