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2. Suspended Solids and Phosphorus Loading <br /> The water quality and flow data were used to calculate sediment and phosphorus loading rates. <br /> The calculations were done for TSS, VSS, TSS-VSS, (i.e., non-volatile suspended solids), total <br /> phosphorus, and ortho phosphorus. <br /> Samples for total phosphorus, ortho phosphorus, and TSS were collected between August 27, <br /> 1996 and August 5, 1997. Samples for VSS were collected only during the time interval April 9, <br /> 1997 through August 5, 1997. The VSS data for the remaining period were estimated from <br /> known values of TSS using a curve fitted through the observed data (see Appendix D). <br /> The stream inflow data were obtained for two locations: ERCR 15 and TBCR 35. The stream <br /> outflow data were obtained at the Lake Orono Dam. <br /> The flowrates at ERCR 15 were obtained from the U.S. Geological Survey (USGS), Minnesota <br /> • <br /> District (see Appendix E). The USGS considers flow data to be "provisional" until eventual <br /> official publication. <br /> The flowrates at TBCR 35 were monitored by the Sherburne Soil and Water Conservation <br /> District. Flowrates for 11 of the flow measurements were based on stream gauging data collected <br /> in the field. Flow rates for the other seven monitoring events were calculated through <br /> interpolation on a rating curve developed for the station (see Appendix E). <br /> The flowrate at the dam was assumed to be the sum of the flowrates at ERCR 15 and TBCR 35. <br /> Concentration data (mass/volume) were multiplied by the average flowrate (volume/day) for the <br /> dates samples were collected to obtain the mass inflow rates at ERCR 15 and TBCR 35 <br /> (mass/day) and the mass outflow rates (mass/day) at the dam (see Appendix D). <br /> • <br /> 1•1-\0596W I\ELKRIVER RPT•NCW 6 <br />