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<br />. <br /> <br />" <br /> <br />d' <br />!:'- <br />C, <br />c) <br />C", <br />':':l <br /> <br />. <br /> <br />A. Case 0 <br /> <br />1) Daily Data Available: Not applicable <br /> <br />2) Grab Sample Interval: Not applicable <br /> <br />3) Method: This case is used only for days that have a grab <br /> <br />sample on that particular day. The day's TDS is estimated by <br /> <br />the TDS of the grab sample. If daily flow data is available <br /> <br />for that day, it is used, otherwise, the grab sample's flow <br /> <br />is used. The loading is calculated as: flow (af/day) x TDS <br /> <br />(mg/L) x 0.0013597 = tons/day. <br /> <br />B. Case 1 <br /> <br />1) Daily Data Available: Flow and EC <br /> <br />2) Grab Sample Interval: GSI < MAXILO <br /> <br />3) Method: Determine a linear relationship bet>1een EC and TDS <br /> <br />. <br /> <br />using the 2 bordering (wrt. time) grab samplE's. Input the <br /> <br />daily EC into this function to estimate today's TDS. <br /> <br />Calculate the loading as: flow (af/day) x TllS (mg/L) x <br /> <br />0.0013597 = tons/day. <br /> <br />If this day's EC is not near to the EC values of the 2 <br /> <br />bordering grab samples, or if the TDS calcul~tted by this <br /> <br />method differs from the TDS calculated by the, long-term <br /> <br />regression equation by more than "PCT2" perce:nt (presently <br /> <br />25%), then use the TDS calculated using the l.ong-term <br /> <br />regression equation (case 2). <br /> <br />A-3 <br />