San Diego River FY 2009-2010 WURMP Annual Report Appendices

San Diego River WURMP Annual Report Appendix A-1
FY 2009–2010 Water Quality Activity
TITLE:
Additional Dry Weather Monitoring
PROJECT SUMMARY
The City of La Mesa (City) has been focused on eliminating pollutants from entering our
receiving water bodies and identifying pollutant sources. Consequently, the City conducted
additional non-storm water quality monitoring within the San Diego River Watershed. The
purpose of the study was to evaluate the water quality of the discharged flow. Two
sampling locations were identified within the Alvarado Drainage Basin. All water samples
during this study were taken in June 2010 and were evaluated for the same suite of
constituents measured in the City’s annual Dry Weather Field Screening and Analytical
Monitoring Program, receiving water body 303 (d) listings constituents, and watershed
constituent of concerns as reported in the WURMP. This included measuring flow,
temperature, pH, conductivity, turbidity, nitrate, ammonia, orthophosphate, dissolved
oxygen, and MBAS in the field and total hardness, dissolved metals, chlorpyrifos, diazinon,
surfactants, oil and grease, TDS, TSS, total coliform, fecal coliform, and enterococcus
bacteria in the laboratory. Results have been received and are being analyzed.
PARTICIPATING JURISDCTIONS
• City of La Mesa
WATERSHED PRIORITY POLLUTANTS ADDRESSED
• Bacteria (high priority)
• TDS (high priority)
• Turbidity/TSS
• Diazinon
• Metals
• Total Phosphorous, Dissolved Oxygen, and pH (high priority)
HOW THIS ACTIVITY RELATES TO THE WATERSHED
This activity is above and beyond the Dry Weather Field Screening and Analytical
Monitoring Program. Analyzing samples of non-storm water discharge from two locations
within the San Diego River Watershed provides insight into water quality leaving the City of
La Mesa. It also enables the City to conduct potential follow-up investigation of potential
pollutant sources. Monitoring is intended as a long-term activity; however, sampling
locations may vary each year. This activity is consistent with WURMP Strategic Goals 2
through 5.
ACTIVITIES CONDUCTED DURING 2009-2010
The following activities were conducted during 2008-2009:
• Identified two discharge locations to monitor within watershed.
• Conducted sampling in June 2009 inclusive of field monitoring and laboratory
analysis.
• Prepare letter report analyzing data.
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