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• 3. Surface Water Monitoring <br />Table 7-102, updated every year in the Seneca II AHR, provides a summary of all historic and current <br />surface water monitoring sites. Table 7-103 provides the frequencies oT surface water quality and flow <br />monitoring. Table 7-104 provides the surface water parameter long list, while Table 7-105 provides <br />the surface water parameter shoe list. These lists were approved at the same time the two ground <br />water parameter lists were approved (see previous section). The shoe list is used for upper Grassy <br />Creek (Site SW-52-11 and Twenty Mile Park Sites SW-52-10 to 13. All other sites use the long list. <br />NPDES discharge points 002, 003, 004, and 008 are monitored in accortlance with terms and <br />frequencies stipulated in NPDES Permit CO-0000221. The minimum monitoring requirements common <br />to all four points are listed in Table 7-703. Additional monitoring requirements may be found in the <br />NPDES permit (Appendix 7-51~ Also, flows are monitored at all lour points continuously with flume <br />water level recorders (except during the winter months when the stilling wells are frozen!. <br />4. Water Monitoring Techniques <br />Raw water samples are taken from the sampling site and placed into specially prepared sample bottles. <br />Dissolved constituent samples are filtered in the field with a 0.45 micron filter membrane. Water <br />• samples are chilled by packing the bottles in iced coolers, and promptly taken to a laboratory for <br />chemical analysis using EPA approved methods. The types of preservatives and bottles used in the <br />monitoring program are contained in Table 7-106. Table 7-107 provides holding time for each chemical <br />parameter. <br />All water samples are field tested for pH, temperature, and electrical conductivity (corrected to 25`C) at <br />the time they are collected. The pH meter is calibrated before each day's use by performing atwo- <br />point calibration using pH 7.0 and 10.0 buffer solutions. Single point calibration checks are performed <br />in the field. Conductivity meter calibrations are performed daily using potassium chloride solutions <br />varying in strength from 1000 up to 3000 umhos/cm. Surlace and spring water quality samples are <br />collected by grab sampling. Elow monitoring procedures vary with the amount of flow. Low flows are <br />measured with a bucket and stopwatch, or a ponable cutthroat flume at a small <br />f 1 <br />~. <br />7-345 Revised 02!05!97 <br />