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The lowest average turbidity reading occurred at Sample Point E (5.3 NTU) and <br />the highest at Sample Point A (26.7 NTU). A high reading at Sample Point A <br />would be expected since it is located at the canal's western terminus and <br />normally experiences no flow. The next highest average reading occurred at <br />Sample Point B (19.1 NTU). In fact, average turbidity decreases from Sample <br />Point A to Sample Point E, perhaps influenced by clear artesian well water <br />discharges into the canal and the filtering out of particulate matter by aquatic <br />vegetation as the water flows east to the discharge point just east of Sample <br />Point E. The average turbidity at Sample Point F (10.8 NTU) was twice that of <br />the value at Sample Point E. <br />ADDITIONAL ANALYSES — JULY 20, 2017 and August 11, 2017 <br />On July 20, 2017 and August 11, 2017, two more sample sets were taken at the six <br />original sample points and at a pipe discharge west of Sample Point B (labeled PSP) <br />and in the northwest corner of the WRWWTF wetland's deep settling pond (labeled <br />DSP). The locations are shown on Figure 10. The samples were analyzed for <br />ammonia nitrogen and ortho-phosphate in addition to the previously tested constituents. <br />Because the pipe discharge constituted all of the canal flow in its western reach (except <br />for groundwater seepage), its measurements were considered as canal water <br />measurements at that location and therefore, a line was drawn on each graph <br />connecting Sample Point PSP with Sample Point B. Data for Sample Point A was not <br />plotted for the reasons previously discussed. Note that the WRWWTF wetland system's <br />northern treatment cells abutting the 8th Street Canal during this period were dried for <br />maintenance and therefore, cannot be considered a contributor to nutrients measured <br />during these two sample events. <br />Figure 10 — NEW SAMPLE POINT LOCATIONS <br />- ; ;8th Street Canal D <br />�Sth Street Canal <br />1U <br />` West Regional L <br />Wastewater <br />Treatment Plant ®` <br />and Wetlands k <br />. _. .. s x gym. _..., .utt .—�•i�r7 rat - <br />1�1er <br />r� <br />13 <br />FAPublic Works\KeithM\Stormwater Projects\IRFWCD 8th Street Canal Water Study\Memo 2 - 8th Street Canal.doc 44 <br />