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influenced by the 8th Street Canal to the west. The average NOx concentration <br />at Sample Point F is 0.31 mg/I lower than the concentration at Sample Point E, <br />indicating elevated NOx concentration in the Study Area section. <br />NOx Summary <br />• NOx nitrogen is readily available for uptake by plants. <br />• Average canal NOx concentrations are relatively low up to Sample Point C <br />(about the halfway point in the Study Area), which is about 4,600 feet east of <br />the WRWWTF's deep settling pond. <br />• Average concentrations at Sample Point D are approximately 3.7 times <br />greater than at Sample Point C. <br />• Average concentrations increase east of Sample Point D, with the <br />concentrations at Sample Point E being 3.8 times greater than those at <br />Sample Point D and 14.0 times greater than those at Sample Point C. <br />• The average NOx concentration at the Study Area's discharge point into the <br />Lateral C Canal (Sample Point E) is 3.8 times higher than the concentration in <br />the canal at Sample Point F (the canal's eastern section's discharge point into <br />the Lateral C Canal). The results imply an elevated NOx concentration in the <br />Study Area. <br />b. Total Kjeldahl Nitrogen (TKN) Results <br />TKN is the sum of organic nitrogen and ammonia nitrogen concentrations. <br />Ammonia nitrogen is the only portion of TKN that is readily accessible for uptake <br />by plants. Table 3 and Figure 3 show the average TKN concentrations at the <br />various sample locations along the canal length. As discussed in the NOx <br />Section, the data for Sample Point A is likely contaminated and therefore <br />assumed unreliable. <br />TABLE 3 - 8th Street Canal TKN (mg/1) <br />{ _ <br />FIGURE 3 -AVERAGE TKN NITROGEN <br />ALONG CANAL (mg/1) <br />SAMPLE DATE A B C D E F <br />9/13/2016 <br />1.70 <br />2.40 <br />2.40 <br />1.60 <br />1.30 <br />0.73 <br />3.00 <br />2.50 <br />9/20/2016 1.20 2.50 2.30 1.50 1.20 0.64 <br />9/27/2016 <br />2.30 <br />2.20 <br />2.40 <br />1.60 <br />1.10 <br />0.96 <br />a <br />9/30/2016 <br />1.20 <br />2.50 <br />2.30 <br />1.50 <br />1.20 <br />0.90 <br />2'00 <br />1.50 <br />10/4/2016 0.88 2.50 2.10 1.50 1.00 0.99 <br />10/11/2016 <br />1.10 <br />2.40 <br />2.10 <br />1.50 <br />1.10 1 <br />1.20 <br />w <br />1.00 <br />0.50 <br />10/18/2016 1.20 2.20 2.00 1.50 0.92 0.78 <br />10/25/2016 0.92 2.30 2.20 1.40 0.80 0.67 <br />11/1/2016 <br />1.00 <br />3.90 <br />2.30 <br />1.70 <br />0.80 <br />0.57 <br />_ <br />COUNT <br />9 <br />9 <br />9 <br />9 <br />9 <br />9 <br />0.00 <br />A s c D E F <br />rAVERAGEl 1.28 2.54 2.23 1.53 1.05 0.83 <br />Data shows that the highest TKN concentrations in the canal are in the vicinity of <br />Sample Point B. Concentrations gradually decrease from Sample Point B as the <br />water travels east to the Study Area discharge just east of Sample Point E. The <br />WRWWTF is a biological wastewater treatment facility that uses bacteria, <br />diatoms, paramecium, and other single -celled microorganisms to remove waste <br />6 <br />FAPublic WorksWeithM\Stormwater Projects\IRFWCD 8th Street Canal Water Study\Memo 2 - 8th Street Canal.doc 37 <br />