04/10/2018 - Laserfiche WebLink

Home Browse Search

Point C to Sample Point D, but drops only 0.01 mg/I between Sample Point D and the discharge into the Lateral C Canal at Sample Point E. The average TP at Sample Point E is 0.03 mg/I lower than that measured at Sample Point F, indicating the 8th Street Canal east of the Lateral C Canal has a slightly greater TP loading than the Study Area section. TP Summary • TP is composed of ortho-phosphate plus organic and polyphosphate, with the ortho- phosphate being readily available to plants while the organic and polyphosphate forms are not. • The average TP concentration drops as the water flows east into the Lateral C Canal, and it is 1.60 times greater at Sample Points B/C than at the Study Area discharge at Sample Point E. • The highest average TP concentrations appeared at Sample Points B/C and Sample Point B is opposite the WRWWTF wetland. However, it is expected that most of the ortho-phosphate originally present in the WRWWTF effluent would have been removed by the biological process. • The reduction of average TP values from Sample Point C to Sample Point E indicates dilution of TP by downstream water inputs, or else a significant amount of the TP present is in the form of ortho-phosphate, or both. • Because of the notable TP reduction east of Sample Point C, if there is insignificant dilution occurring downstream of Sample Point C, then ortho-phosphate is present. This means that much of the TP at Sample Points B/C is comprised of ortho- phosphate. • The average TP concentration at the Study Area's discharge point into the Lateral C Canal (Sample Point E) is 1.2 times lower than the concentration in the canal at Sample Point F (the canal's eastern section's discharge point into the Lateral C Canal). The results imply a slightly elevated TP concentration in the canal section east of the Study Area. FIELD DATA Various field data was collected during the Phase 1 sampling program. While it is difficult to draw many helpful conclusions from this data, some general comments follow. a. pH — pH is a measure of how acidic or basic water is and ranges from 0 to 14, with 7 being neutral. pH values less than 7 indicate water is acidic and greater than 7 indicates the water is a base. Each pH number represents a 10 -fold change in the acidity or basicness of the water. For example, water with a pH of 5 is ten times more acidic than water with a pH of 6. pH is important because it determines the solubility and biological availability of constituents such as nitrogen and phosphorus. The average pH along the 8th Street Canal is shown below in Figure 5. 9 FAPublic Works\KeithM\Stormwater Projects\IRFWCD 8th Street Canal Water Study\Memo 2 - 8th Street Canal.doc 40