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TDS Exceeds Water Quality Objective For La Posta Creek.pdf

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Preview of TDS Exceeds Water Quality Objective for La Posta Creek
🔗 Source: waterboards.ca.gov
📊 Size: 673 KB
📄 Pages: 16 pages
⬇️ Downloads: 53

Summary

- Watershed Characteristics: La Posta Creek is within the Tijuana River Watershed, spanning approximately 1,750 square miles, with a significant portion in both California and Baja California. The creek is 18 miles long and has a hydrologic unit basin number of 1'1.60-1'1.70. It supports various beneficial uses, including municipal, agricultural, industrial, freshwater replenishment, recreation, and wildlife habitats.

- Water Quality Concerns: Total Dissolved Solids (TDS) concentrations exceed the water quality objective, indicating water impairment.

- Impairment Evidence: High TDS levels were recorded in January 1998 (320,000 mg/L) and October 1997 (140,000 mg/L), both during the rainy season.

- Potential Sources: Stormwater runoff is likely the primary source of contamination, given that violations occurred in the rainy season months.

- TMDL Priority: Currently, it is not recommended to add La Posta Creek to the 303(d) list due to sporadic exceedances of the TDS water quality objective (in 1997 and 1998).

- Benthic Macroinvertebrate Assessment: The species level analysis reveals a range of aquatic insects, including Caenidae (Caenis sp., Caenis tardata), Tricorythidae (Tricorythodes sp., Tricorythodes fallax), Trichoptera, Odonata (multiple families), and various other insect orders.

- Conclusion: While the creek faces water quality challenges due to high TDS levels, it supports diverse aquatic ecosystems and beneficial uses. Further monitoring and management strategies are needed to address the identified impairment.

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Description

La Posta Creek, part of the Tijuana River Watershed spanning US and Mexican territories, faces water quality issues primarily due to high Total Dissolved Solids (TDS) concentrations, surpassing the established objectives. This impairment affects various beneficial uses, including recreation, wildlife habitats, and agricultural purposes.

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  • File Format: PDF
  • File Size: 673 KB
  • Pages: 16
  • Language: EN
  • Total Downloads: 53
  • Last Updated: 1 week ago

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