Turbidity Sample Clauses

Turbidity. Not to exceed 1 NTU. Government test verification may be determined by means of the finished product manufacturer’s Certificate of Analysis. 2. 7.2.1 Sampling procedures for pH and sodium and 7.

Turbidity. Turbidity is a measurement of the water clarity. Turbidity is caused by sediment entering the water column and in some cases is caused but excessive nutrients causing algal growth. The threshold for turbidity is based on the EPA reference criteria identified in the document titled: Ambient Water Quality Criteria Recommendations Information Supporting the Development of State and Tribal Nutrient Criteria, Rivers and Streams in Nutrient Ecoregion VII. 2000. US Environmental Protection Agency. The values listed are specific to the appropriate sub- ecoregion identified in the document. Specific conductance is a measure of the drop-in voltage caused by the resistance of the water. Each stream tends to have a relatively constant range of conductivity. Significant changes in conductivity can be an indicator that a discharge or some other source of pollution has entered a stream. Nutrients are essential for growth. Streams often contain excessive levels of nutrients, which results in additional algae and other plant growth. The main nutrients of concern are phosphorus and nitrogen, and both elements can be found in several forms. Phosphorus can be measured as total phosphorus (TP) or ortho-phosphorus. Ortho-phosphorus typically represents the “reactive” and bioavailable form of phosphorus. Ortho-phosphorus can also be called Soluble Reactive Phosphorus depending on the analytical laboratory method used to quantify the amount of available phosphorus. Nitrogen can be measured as total nitrogen (TN), Kjeldahl nitrogen (TKN), nitrate+nitrite and ammonia nitrogen. TKN represents the fraction of TN that is unavailable for growth or bound up in organic form, it also includes ammonium. The remaining fractions, nitrate-nitrite and ammonia represent bioavailable forms of nitrogen. Phosphorus and nitrogen in excess amounts can accelerate eutrophication, causing dramatic increases in aquatic plant growth and changes in the types of plants and animals that live in the stream. This, in turn, affects dissolved oxygen, temperature and other indicators. Excess nitrates can cause hypoxia (low levels of dissolved oxygen) and can become toxic to warm-blooded animals at higher concentrations. The threshold values listed for nutrients are based on the EPA reference criteria identified in the document titled: Ambient Water Quality Criteria Recommendations Information Supporting the Development of State and Tribal Nutrient Criteria, Rivers and Streams in Nutrient Ecoregion VII. 2000. US ...

Turbidity. 1) When sampling turbidity in the Receiving Water shows a 5 NTU increase in turbidity downstream of the discharge over the Background Level when that level in the Receiving Water is 50 NTU or less. 2) When sampling turbidity in the Receiving Water shows a 10 percent increase in turbidity downstream over the Background Level when that level in the Receiving Water is 50 NTU or more.

Turbidity. The turbidity measurements were considered reliable through most of the experiment, except for the major spike measurement on 16. Mar. and one measurement at 21.21 h on the 4. May during the nychthemeron measurements. The spike measurements were likely caused by some bigger and smaller particles sticking to the turbidity measuring device. During the latter measurement error, all turbidity values in the dataset showed 12.45

Turbidity. The water quality standards for turbidity allows for no more than a 5 nephelometric turbidity unit (NTU) increase over background when background turbidity is 50 NTU or less and a 10% increase in turbidity when the background turbidity is more than 50 NTU. Turbidity was very low at all times and locations during WY 2000, averaging 1.9 to 2.2 NTU, depending on the category of the station. Maximum turbidity was noted during peak flows in April and May, but not exceeding 3.3

Turbidity. The turbidity levels trend showed fairly distributed at all monitoring station during the reporting period. No obvious trend of turbidity levels of each monitoring station was shown. The trend of turbidity levels of each monitoring station was shown in Appendix G. Moreover, the trend did not show any noticeable deterioration of turbidity.

Turbidity. ‌ Turbidity was monitored before, during, and after cutting and removal activities, see Table 3. However, monitoring began on July 10th due to shipping delays for the equipment. It is assumed that low flow in the period between May and September yields variable and highly localized conditions for water quality including turbidity This localization of conditions may be due to groundwater influences, aquatic plant growth, and animal activity in the creek. Samples were taken based on work locations. Both cutting events and removal events were seen to cause organic material disturbance which increased turbidity in the creek. This was chiefly decomposed material and/or algae that was attached to the root masses of the parrot's feather being removed. However, increases of turbidity associated with cutting and collection, tended to be gone after 24 hours, see Table 2. Sediment from the creek’s bottom or banks was rarely disturbed. The BC turbidity guidelines for aquatic life require no change over 5 NTU at any time when background turbidity is between 8 – 50 NTU (Singleton, 2021). The majority of after samples were taken within 1 – 2 hours of the ‘during’ sample and show a return to the starting turbidity levels or are within the recommended ranges. There were, however, two outliers, ‘during’ removal events on September 11th and 18th, where turbidity guidelines were exceeded, turbidity did return to below the ‘before’ levels two hours after work in the affected areas was completed. Date Action Before NTU During NTU After NTU (taken within 24 hrs) 10-Jul-24 Removal 6 6 4 17-Jul-24 Removal 0 - 2 18-Jul-24 Cutting 2 - 0 24-Jul-24 Removal 4 8 4 25-Jul-24 Removal 6 12 6 31-Jul-24 Cutting 6 10 8 8-Aug-24 Removal 2 3 1 14-Aug-24 Removal 6 6 6 28-Aug-24 Removal 4 6 6 29-Aug-24 Removal 8 6 10 4-Sep-24 Cutting 0 12 6 11-Sep-24 Removal 10 16 6 12-Sep-24 Removal 4 10 6 18-Sep-24 Removal 10 98 8 26-Sep-24 Removal 12 16 11 9-Oct-24 Removal 2 10 0 5.3.2 TEMPERATURE AND DISSOLVED OXYGEN‌ Two dissolved oxygen/temperature data loggers were installed in Somenos Creek, which recorded measurements every ten minutes. The first data logger was placed at the Lakes Road bridge to capture water quality directly below the project area. The second data logger was placed at the Tzouhalem Road bridge (Appendix A, Figure 1), around 660m downstream from the Lakes Road bridge, to act as a control site. Data loggers were cleaned weekly as algal growth was noted to impact the data quality. The grap...

Turbidity. Not to exceed 1 NTU. Government verification may be determined by means of the finished product manufacturer’s Certificate of Analysis.

Turbidity. Turbidity is a measure of water transparency and is expressed in Nephelometric Turbidity Units (NTUs). Suspended solids are a common cause of turbid water. Silt and sand can enter surface waterways from runoff, poor drainage practices, and development. Other solids can come from wastewater and spills. Phytoplankton blooms are also an important cause of turbidity during summer months. Solids in the water can clog the gills of fish and block light from reaching underwater plants.