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Redwood City <br /> Water Quality Monitoring Program Plan <br /> <br /> <br />© 2014 DKF Solutions Group, LLC Page 15 of 41 <br /> <br /> <br />B. Sampling Parameters for Redwood City <br /> <br />1. Ammonia <br /> Discussion: See Section 7A <br /> Sample Container: Plastic/glass <br /> Sample Type: Grab <br /> Sample Volume Required: 200 ml. minimum <br /> Hold Time: 28 days <br /> Preservative: Sulfuric acid <br /> Analytical Method: Method 4500-XX R and C, Standard Methods for the <br />Examination of Water or Wastewater, 21st Edition <br /> <br />2. Total Coliform/Fecal (not currently used in this Plan by the City) <br /> Discussion: See Section 7A.2 <br /> Sample Container: Plastic (sterile) <br /> Sample Type: Grab <br /> Sample Volume Required: 100 ml. minimum <br /> Hold Time: 8 hours <br /> Preservative: None if waters are not chlorinated <br /> Analytical Method: Method 9221 B, C and E, Standard Methods for the <br />Examination of Water or Wastewater, 21st Edition <br /> <br />3. Enterococcus <br /> Discussion: See Section 7A.2 <br /> Sample Container: Plastic (sterile) <br /> Sample Type: Grab <br /> Sample Volume Required: 100 ml. minimum <br /> Hold Time: 8 hours <br /> Preservative: None if waters are not chlorinated <br /> Analytical Method: IDEXX Enterolert® Test Kit, Method 9230D, Standard <br />Methods for the Examination of Water or Wastewater, 21st <br />Edition <br /> <br />4. pH <br /> Discussion: Just as “degree” is a measure of temperature, pH is a <br />measure of how acidic or basic the water is. Water pH is <br />critical to fish habitat because it can affect fish egg production <br />and survival, aquatic insect survival and emergency, and the <br />toxicity of other pollutants such as heavy metals or ammonia. <br />Like water temperature, pH naturally varies both daily and <br />seasonally. <br /> <br />Most daily cycles in pH occur as a result of the <br />photosynthesis of aquatic plants. Through photosynthesis, <br />plants convert the sun’s energy into chemical products they <br />need to live and grow. During daylight hours, aquatic plants <br />consume carbon dioxide (an acid), and produce hydroxide (a <br />base). As a result, water becomes more basic during the day <br />(pH values get higher) and usually peaks mid- to late- <br />6.2.A. - Page 181