Lower Salinas River Watershed TMDL - Monitoring Data

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A watershed-related topic examined by the ENVS 560/L Watershed Systems class at CSUMB.

Summary

Monitoring of the Lower Salinas River Watershed is required by the Central Coast Region Agricultural Waiver. In order to comply the central coast agricultural community consolidated monitoring within a Cooperative Monitoring Program (CMP). This Cooperative Monitoring Program is managed by Central Coast Water Quality Preservation, Inc. (CCWQP), and releases annual reports. The most recent report published by CCWQP is from 2018 [1]. Within the report the Lower Salinas Watershed is listed as Hydrologic Unit (HU) 309. CCWQP also submits quarterly results of monitoring to the Central Coast Regional Water Quality Control Board (CCRWQCB). These results are displayed on the California Environmental Data Exchange Network (CEDEN) [2].

Status of Nitrate

The overall target TMDL for Nitrate is 10 mg/L for all receiving waterbodies. During the dry season (May 1st - October 31st) Nitrate should not be over 1.4 - 6.4 mg/L in impaired receiving waters for specific streams. During the wet season nitrate should not exceed 8 mg/L for impaired, receiving streams. [3]

Image 1. 2018 Average Nitrate monitoring data for locations within the Lower Salinas River Watershed Cooperative Monitoring Program. The testing performed by Central Coast Water Quality Preservation, Inc. and data is retrieved from Central Coast Cooperative Monitoring Program 2018 Annual Water Quality Report

An example of time series data generated from the California Environmental Data Exchange Network (CEDEN)

Image 2. Time Series of Nitrate+Nitrite as N monitoring data at Blanco Drain. Data was gathered using the California Environmental Data Exchange Network (CEDEN)

Status of Un-ionized Ammonia

The target TMDL for un-ionized ammonia is 0.025 mg/L.[3] The majority of the water bodies in the Lower Salinas Valley have an un-ionized concentration mean bellow 0.025 mg/L.

Image 3. 2018 Average Unionized Ammonia monitoring data for locations within the Lower Salinas River Watershed Cooperative Monitoring Program. The testing performed by Central Coast Water Quality Preservation, Inc. and data is retrieved from Central Coast Cooperative Monitoring Program 2018 Annual Water Quality Report
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Image 4. Time Series of Unionized Ammonia monitoring data at Blanco Drain. Data was gathered using the California Environmental Data Exchange Network (CEDEN)

Status of Orthophosphate

The target TMDL concentration for orthophosphate is 0.3 mg/L during the wet season (November 1st - April 30th). The dry season target (May 1st - October 31st) depends on the specific waterbody, but target threshold ranges from 0.7 mg/L to 0.13 mg/L. [3]

Image 5. 2018 Average Orthophosphate as P monitoring data for locations within the Lower Salinas River Watershed Cooperative Monitoring Program. The testing performed by Central Coast Water Quality Preservation, Inc. and data is retrieved from Central Coast Cooperative Monitoring Program 2018 Annual Water Quality Report

An example of time series data which was generated using California Environmental Data Exchange Network (CEDEN) .

Image 6.Time Series of Orthophosphate as P monitoring data at Blanco Drain. Data was gathered using the California Environmental Data Exchange Network (CEDEN)

Links

References

  1. Central Coast Water Quality Preservation Inc. 2019. Central Coast Cooperative Monitoring Program 2018 Annual Water Quality Report https://ccwqp.org/wp-content/uploads/2019/11/2018-CMP-Annual-Report.pdf
  2. California Environmental Data Exchange Network (CEDEN) https://ceden.waterboards.ca.gov/AdvancedQueryTool
  3. 3.0 3.1 3.2 Lower Salinas TMDL Summary

Disclaimer

This page may contain student work completed as part of assigned coursework. It may not be accurate. It does not necessary reflect the opinion or policy of CSUMB, its staff, or students.