Prior Lake - Spring Lake Watershed District 2009 Water Quality ...

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which sites vary from acceptable levels, the PLSLWD is able to focus and refine futurewatershed monitoring and analyses efforts in areas that are more likely to be the contributingsources of pollution.d. Flow and PrecipitationFlow and precipitation information is very important when analyzing data. It can helpdetermine if a pollutant is caused by point or non‐point source of pollution. For example, ifwater quality deteriorates after a rain event, it is possibly due to non‐point sources, like run‐off.If the water quality improves as the volume of water increase, it could mean that a point sourceof pollution is being diluted. Field staff visually estimated flow in cubic feet per second (cfs)while taking synoptic samples. Flow was not recorded during deployments, but precipitationwas. Precipitation data was used from the Eagle Creek Metropolitan Council water monitoringstation in Savage, Minnesota (directly northeast of the PLSLWD) which recorded a dataset every15 minutes, the same interval as the deployment monitoring equipment.e. Sample FrequencySynoptic monitoring was scheduled every two weeks. However, towards the middle ofsummer, most stream flow ceased and synoptic monitoring only took place after rain events.Synoptic monitoring was conducted on 16 days in 2009.Deployments were scheduled whenever possible, especially when a storm event was expectedin order to capture the response of the stream site to rainfall. In 2009, 16 deployments werecaptured.f. Quality Assurance / Quality ControlWhen not on extended deployment studies, sondes were calibrated daily for dissolved oxygen,weekly for pH and conductivity, and monthly for turbidity. Sondes were also directly comparedto each other to verify that they measured closely in field conditions. All calibrations andcomparisons were recorded in spreadsheets. Sondes were also cleaned, maintained, andupgraded when necessary.During the beginning of the season, synoptic monitoring was performed at two‐week intervalsto avoid bias in samples. Towards the end of the monitoring year, the only times streams wereflowing were after storm events. These samples will be more representative of rainfall events.Page 6 of 15
IV. Resultsa. IntroductionWater quality was highly variable spatially and temporally throughout the PLSLWD. This sectionpoints out potential problem areas based on the 2009 results. Please refer to Appendix 2, 3 and4 for complete dataset results. The table below represents maximum and/or minimum resultsfor each site during the synoptic studies. A more in‐depth explanation and analysis of eachspecific parameter is described below the table.Page 7 of 15
Page 1 and 2: Prior Lake ‐ Spring Lake Watershe
Page 3 and 4: I. IntroductionThe Prior Lake ‐ S
Page 5 and 6: The “Upper Watershed” consisted
Page 7: SSWCD staff worked collaboratively
Page 12 and 13: Figure 6 - 2009 Maximum Turbidity V
Page 14 and 15: Figure 7 - Red points indicate that
Page 16 and 17: Figure 8 - Red points indicate that
Page 18 and 19: Appendix 1 ‐ Synoptic Site Locati
Page 24 and 25: Appendix 2: Synoptic Data ‐ Sorte
Page 36 and 37: Site # & DateSampledAppendix 3: Syn
Page 48 and 49: Appendix 4 - Synoptic Graphs and Fi
Page 56 and 57: Appendix 5 ‐ Deployment Data 2009
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Appendix 5 ‐ Deployment Data 2009
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