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b. Ammonia Nitrogen Results <br />Figure 12 shows ammonia nitrogen sample results. The average ammonia <br />nitrogen concentrations from the pipe discharge and the deep settling pond are <br />minimal. Ammonia nitrogen begins to rise significantly after Sample Point PSP, <br />reaching maximum values between Sample Points B and C. After that, the <br />ammonia nitrogen begins to drop, although at the discharge into the Lateral C <br />Canal, its values are almost 7.8 times greater than the average ammonia <br />nitrogen discharging into the Lateral C Canal from the east at Sample Point F. It <br />is possible that the steady decrease in ammonia nitrogen from Sample Point C <br />eastward is at least partially due to uptake by aquatic vegetation in the canal. <br />Dilution from other canal discharge sources may also be a factor. The potential <br />of a leaking sewage force main into the WRWWTF or its air release valve at the <br />canal as ammonia nitrogen contribution was considered, however an <br />examination of pertinent data and equipment by IRCDUS eliminated those <br />possibilities. Ammonia levels in the deep settling pond sampling site were <br />minimal. <br />1.00 <br />Ammonia <br />(m81i) <br />0.50 <br />0.10 <br />0.05 <br />0.00 <br />Figure 12 — AMMONIA NITROGEN RESULTS <br />[the remainder of this page was left blank intentionally] <br />15 <br />FAPublic Works\KeithM\Stormwater Projects\IRFWCD 8th Street Canal Water Study\Memo 2 - 8th Street Canal.doc 46 <br />SAMPLE DAIS <br />A <br />PSP <br />B <br />DSP <br />C <br />D <br />E <br />F <br />7/20/2017 <br />0.140 <br />0.081 <br />0.860 <br />0.053 <br />1.000 <br />0.450 <br />0.280 <br />0.033 <br />8/11/2017 <br />0.027 <br />0.044 <br />0.990 <br />0.049 <br />0.960 <br />0.480 <br />0.160 <br />0.023 <br />AVERAGE <br />0.084 <br />0.063 1 <br />0.925 <br />0.051 <br />0.980 <br />OA65 <br />0.220 <br />0.028 <br />[the remainder of this page was left blank intentionally] <br />15 <br />FAPublic Works\KeithM\Stormwater Projects\IRFWCD 8th Street Canal Water Study\Memo 2 - 8th Street Canal.doc 46 <br />