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<br />'~r9 <br /> <br />0029f;l <br /> <br />a;~~ <br />"....~_: <br />:.~~~:Y- <br /> <br />.;;" <br />~ <br />W} <br />t...~' ~ <br />"':,;; <br />':--}.~. <br />.......,.' <br />:~~~i:~~ <br /> <br />~~ <br /> <br />be analyzed. A critical water quality period i~ ~imply defined as <br />one when high or low discharges occur. During a month when no large <br />deviations in discharge occur, then .only one sample, preferably one <br />taken on or about the mid-date of the month, should be analyzed. <br />In any event, it is expected that at least one '~ample per month be <br />analyzed from this type sampling station. <br /> <br />.'." <br />;",'.;. <br /> <br />~~b <br /> <br />"Sampling Tyoe C." A Type C, or miscellaneous sampling station, is <br />one at which only two samples are taken lone during the period of the <br />year when there is a very low discharge and the other during a period <br />when discharge rates are high. Since only the two samples are taken <br />at such stations, it is important that the representative low flow <br />and high flow periods are sampled. <br /> <br />! <br />J <br />I <br />1 <br />1 <br />1 <br /> <br />"Analvtical Tvne I." An analytical Type I station is one in which <br />a complete chemical analysis is made of the samples. Complete <br />analysis includes the following determinations: pH, specific con- <br />ductance, silica, iron, calcium, magnesium, sodium, potassium, <br />carbonate, bicarbonate, sulphate, chloride, fluoride, nitrate, <br />boron, total dissolved solids, total hardness, noncarbona te hardness <br />and sodium adsorption ratio. <br /> <br />::~'::- <br />t1~~ <br />~l~ <br />I: <br />ij:,~~ <br />~i~tj <br />:'.:;'.?, <br />~ <br />~; <br />~;~( <br />\~ <br />I <br /> <br />f.\~i <br /> <br />I <br />).~tf. <br /> <br />"Samplinll: Type D." A Type D sampling station is a station at which <br />a miscellaneous sample i~ taken by the local Bureau of Reclamation <br />hydrologists for analysis by the USGS. <br /> <br />S. "Analytical Tvnes:" To determine the quality of water for irrigation <br />purposes and other uses, it is not always necessary to have a <br />complete quantitative determination of the mineral constituents. For <br />this reason, in Region 7, the following analytical types are <br />recognized and are so designated on the Control Schedule. <br /> <br />x <br />., <br />" <br />-~ <br />1 <br />I <br />1] <br />~j <br />., <br />~~~ <br />~~ <br />;'j' <br />:~ <br />~ <br />., <br />,i <br />'4 <br /><1 <br />:.:~ <br />.. <br />-.,~ <br /> <br />"Analytical Type II." The analytical Type II ~tation i~ one at which <br />only a partial analysis is made of the constituents. Analysis and <br />measurements should be made to determine the following parameters: <br />Conductivity,. sodium, pH, carbonates and bicarbonates, total cations, <br />and sodium adsorption ratio. <br /> <br />~<i; <br />~F <br /> <br />6. Discharge Data. Discharge data at the time samples are taken are <br />required. Instantaneous discharge data are preferred. It is <br />important that composite samples are prepared in accordance with <br />the instantaneous diSCharge. All reports of analyses should show <br />the discharge at the time the sample was taken. <br /> <br /> <br />:.:.:- <br /> <br />~.:;; <br /> <br />'." <br />, <br />~~ <br />;~J <br /> <br />7. Following is a description of the program changes for new sampling <br />or other requests which are not considered self-explanato~' on the <br />bar diagram: <br /> <br />,-;, <br />~.. <br />:/>' <br />/~ <br /> <br />.'. <br />~f <br />'~:' <br /> <br />'", <br />.' <br /> <br />~. . <br /> <br />. <br /> <br />3 <br /> <br />;". <br /> <br />;..: <br /> <br />"; <br /> <br /> <br />