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a. Nitrite/Nitrate Nitrogen (NOx) Results <br />Figure 11 shows NOx Nitrogen sample results. As seen on Figure 10, the <br />average NOx in the canal between Sample Points PSP and C is very low. NOx <br />concentrations begin to climb somewhere after Sample Point C and continue to <br />increase through sample Point E as was seen in previous sampling results. The <br />average NOx concentration into the Lateral C canal at Sample Point E was 4.6 <br />times greater than the NOx discharging into the Lateral C Canal from the east at <br />Sample Point F. Neither the PSP pipe discharge or the WRWWTF wetland <br />system/deep settling pond appear to be contributing noticeable NOx to the 8th <br />Street Canal. The majority of nitrogen entering the wetland system/deep settling <br />pond from the WRWWTF is in the form of NOx based on the biological processes <br />taking place in the WRWWTP. <br />0.20 <br />0.15 <br />NOx {mg/1) <br />0.10 <br />0.05 <br />OAO <br />Figure 11 — NOx NITROGEN RESULTS <br />[the remainder of this page was left blank intentionally] <br />14 <br />F:\Public Works\KeithM\Stormwater Projects\IRFWCD 8th Street Canal Water Study\Memo 2 - 8th Street Canal.doc 45 <br />SAMPLE DATE A <br />I PSP I <br />B <br />f -D -S -Pr <br />C <br />I D <br />I € <br />F <br />7/20/2017 0.025 <br />0.025 I <br />0.025 <br />0.025 <br />0.025 <br />0.095 <br />0.130 <br />0.054 <br />8/11/2017 0.025 <br />1 0.025 1 <br />0.025 <br />0.025 <br />0.025 <br />0.085 <br />1 0.240 <br />0.025 <br />AVERAGE I0.025M<0:025Mt0.025Mt0:025At0:0259(0:090 UO:185M M0:0401 <br />[the remainder of this page was left blank intentionally] <br />14 <br />F:\Public Works\KeithM\Stormwater Projects\IRFWCD 8th Street Canal Water Study\Memo 2 - 8th Street Canal.doc 45 <br />