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for all ground water quality data). All ground water samples collected in 1990 or after were analyzed <br />for the chemical parameters presented in Table 15-4. <br />PWCC's Yoast baseline surface water monitoring program, starting in 1990, consisted of three sites <br />on Sage Creek, two sites on Y1 Gulclt la previously unnamed tributary to Sage Creekl, one site on the <br />Annand Draw la previou:;ly unnamed tributary to Grassy Creekl. and one site on Grassy Creek. <br />Semiannual spring surveys, beginning in 1991, identified ten springs in the Yoast areas. See Table 15- <br />2 for details of these stream and spring monitoring sites. <br />i PWCC generally monitored the surface water sites for flow and field parameters (temperature, pH, and <br />electrical conductivity) monthly from March to October. Winter months were excluded from <br />I monitoring due to low flow conditions, the presence of thick icepack on the stream surfaces, and <br />'i inaccessibility. Samples for lab analysis were generally collected triannually in 1991 and monthly in <br />1992 and 1993. All surface and spring water lab samples were analyzed for the chemical parameters <br />I presented in Table 1 5-5. <br />Operational Hydrologic Monitoring Pro r~ am <br />Water Monitoring Techniques. Raw water samples are taken from the sampling site and placed into <br />specially prepared sample laottles. Dl:ssolved constituent samples are filtered in [he field with a 0.45 <br />I <br />i micron filter membrane. Water samples are chilled by packing the bottles in iced coolers, and <br />' promptly taken to a laboratory for chemical analysis using EPA approved methods. The types of <br />preservatives and bottles wed in the monitoring program are contained in Table 15-6. <br />All water samples are field tested for pH, temperature, and electrical conductivity (corrected to .25°C) <br />at the time they are collected. The pFl meter is calibrated before each day's use by performing ei two- <br />~ point calibration using pH T.0 and 10.0 buffer solutions. Single point calibration checks are performed ' <br />in the field. Conductivity meter calitrrations are performed daily using potassium chloride solutions <br />varying in strength from 1000 up to 3000 umhos/cm. Surface and spring water quality samples are <br />collected by grab sampling. Flow monitoring procedures vary with the amount of flow. Low flovos are <br />measured with a bucket and stopwatch, or a portable cutthroat flume at a small drop in the stream ~~ <br />channel. High flows are computed using measurements of the stream <br />• <br />12 <br />