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C. sediment levelr ... NPGES po oG e, sediment and surface ra ter contr u: are presented ir. <br />Appe nCix C. <br />One issue remains from the second adequacy review of the 1986 Seneca If Permit Renewal <br />(CMLRD memo un September 18, 1986). This pertains to field meter certification. On an <br />annual basis, this field equipment is tested against similar equipment used in an EPA <br />certified laboratory. On December 16, 1986, Dennis Jones, Seneca II Mine Hydrologist, <br />tested his field equipment ayainst the equipment used by 8ookcliffs Laboratory in <br />Steamboat Spri no s. Temperature and pH measured identical to the laboratory's equipment. <br />P eabody's conductivity meter gave readings identical to the lab's at 700 umhos/cm at 25°C, <br />-2.8+k at 1400 umhos/cm at 25°C, and -2.3~ at :700 umhos/cm at 28°C. As a result, the <br />field equipment used at the Seneca Mine appears to be accurately calibrated and in <br />excellent condition. <br />III. KETEOROLOGICAL DATA <br /> Precipitation data was obtained primarily at the Seneca II Mine Meteorological Station. <br />C~ Where indicated, <br />P <br />i <br />it <br />ti <br />d data from the U.S. Weather <br />bl <br />1 <br />d t <br />d i <br />c Service - Hayden Station were used. <br />nted in Table 2 <br />r <br />are <br />t <br />d <br />t <br /> on <br />rec <br />p <br />a <br />ata empera <br />u <br />prese <br />. <br />are presente <br />n <br />a <br />e <br />an <br />e <br />a <br />a <br /> Total monthly prec ipitation data gathered at the Hayden Station since 1981 are presented <br /> in Table 3 and are used in the ground and surface water discussions which follow. <br /> ri'. GROUND WATER <br /> A. Water Levels <br /> Water level data gathered since October 1981 for wells monitoring the various aquifer <br /> units within and adjacent to the Seneca II Mine are presented in Appendix A. Hyd rographs <br /> for these wells are also presented in Appendix A. Because the time scale on the <br /> hydrographs is set automatically by a computer program, the date on which many of the <br /> hydrographs begin is July 1980, even though no data are presented until October 1981. The <br /> change in water level scale is also set automatically as determined by the max/min <br /> val ues.~ 8y presenting five years worth of data, trends related to seasonal and annual <br /> variability and possible mining-related impacts are more clearly evident. Table .4, <br /> Summary of Ground Water IAOnitoring Wells, is presented as a reference for the reader; no <br />. additional wells <br />r l <br />at <br />l were installed during 1986. Per a request by the CMLRD, in 1586 five <br />il/M <br />/J <br />l <br />M <br />A <br />J <br /> w <br />eve <br />e <br />ay, <br />une <br />u <br />y, <br />pr <br />s were taken at all wells: February/ <br />arch, <br /> August/September, and Gctobe r/Ilovember. Pollution plume wells have been and will continue <br />