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Redwood City <br /> Water Quality Monitoring Program Plan <br /> <br /> <br />© 2014 DKF Solutions Group, LLC Page 16 of 41 <br />afternoon. Virtually all aquatic organisms product carbon <br />dioxide (an acid) through their normal metabolism of food <br />(respiration). As a result, water becomes more acid during <br />the night (pH values drop) and usually is lowest just before <br />sunrise. <br /> <br /> Sample Container: None, in-field measurement <br /> Sample Type: Grab <br /> Hold Time: 15 minutes <br /> Preservative: None <br /> Analytical Method: Direct read pH meter, calibrated per manufacturer’s <br />instructions prior to use. <br /> <br />5. Temperature <br /> Discussion: Water temperature is a key factor affecting the growth and <br />survival of all aquatic organisms. The effect of stream <br />temperature on fish, amphibians, macroinvertebrates, etc. <br />varies between species and within the life cycle of a given <br />species (Armour 1991; Beschta et al. 1987; Bjornn and <br />Reiser 1991; Lantz 1971; DEQ 1995). As stream <br />temperatures increase, the amount of dissolved oxygen (DO) <br />available to aquatic biota decreases. As a result, even if food <br />is abundant at higher temperatures, decreases in DO may <br />metabolically stress aquatic organisms, further increasing <br />their susceptibility to disease. <br /> Sample Container: None, in-field measurement <br /> Sample Type: Grab <br /> Hold Time: None <br /> Preservative: None <br /> Analytical Method: Direct read temperature meter, calibrated per manufacturer’s <br />instructions prior to use. <br /> <br />6. Dissolved Oxygen <br /> Discussion: The dissolved oxygen concentration is an indication of the <br />potential impacts of the spill on the biological community of <br />the receiving water. The dissolved oxygen concentration of <br /><2 mg/L downstream or at the site of the spill is an indication <br />of serious biological impacts including potential fish kill. <br />Generally, the dissolved oxygen at the downstream should <br />not drop below 5 & 7 mg/L for warm and cold water, <br />respectfully. <br /> Sample Container: Non, in-field measurement <br /> Sample Type: Grab <br /> Hold Time: 15 minutes <br /> Preservative: None <br /> Analytical Method: Direct read temperature meter, calibrated per manufacturer’s <br />instructions prior to use. <br /> <br /> <br /> <br />6.2.A. - Page 182