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<br />. <br /> <br />. <br /> <br />1. Thr~ composites/month, not all with complete chemistry; <br />~. At,lieast 1 composite/month, all with complete chemistry; and <br /> <br />, <br />N 3. Ins1lantaneous. <br />~ <br />W From the hi!storical record, a data base will be developed which will include <br />c..n average monthly values of solute concentration (mg/L) and streamflow (m3/s) <br />for all months with sufficient chemistry data. At least one complete chemical <br />analysis du'ring the calendar month is considered sufficient. Only samples <br />with analys~s for all major ions will be considered. Sodium and potassi~ <br />concentratipns, when reported separately, will be combined.' Missing values <br />for potassi:um will be assumed negligible and ~ill not be cause for exclusion <br />of that sample. If bicarbonate concentrations are not reported, they will be <br />calculated ~rom alkalinity 1/, based on the assumption that alkalinity is <br />totally a result of bicarbonate. <br /> <br />Five method~ will be used to develop the data base. Method selection will be <br />based on th~ nature of the historical record: ' <br /> <br />Method 1. - Category 1 chemical data with daily. specific conductance: <br /> <br />- Compute total dissolved solids concentration (TDSa) for each <br />analYsis (a). <br /> <br />TDSa <br /> <br />6 <br />= ~ C. <br />..1=/ .la <br /> <br />+2 ...2 <br />w1i.?re ~ja ar~ con~entrati<?~s of the six solutes (i): Ca, Mg, <br />Na i+- K"; HC03, Cl, and S04' <br /> <br />- Compute solute mass fractions (Pi). <br /> <br />Cia <br />Pi = TDSa <br /> <br />,- Compute daily concentrations (Cik) for all solutes (i) and days (k) <br />,.,in ~nsampl eel period. <br /> <br />! <br /> <br />TOSa <br />Cik = Pi s;-- Sk <br />a <br /> <br />wh~re Sa = specific conductance of composite sample, and <br />, Sk = measured specific conductance on day k of the unsampled <br />period. <br /> <br />11 HC03 (mgf:L) = 1.219 * Alk. (mg CaC03/L), Hem (1970, p. 81). <br /> <br />3 <br /> <br />;; -, , , --:--:::':~"::-:;"1-,i :::;- 1"""- _~:-:-:__""',:':_": " <br /> <br />',-.--. - ...._....,__--.,._ -"_,, -0_._._......,- <br />" .-,..' <br /> <br />-;---:,-"::- "'C'~,f.-;'7:'.-,:::.-;.~'~'-'-~' -:', <br /> <br />~'l <br />d <br /> <br />: ,,',> (. <br />.t"'~",..". <br />-"",_ l~.,_", <br /> <br />. <br />