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<br />Ground Water Level Summary. Nost aquifers at Seneca II-W exhibit a typical senaomal <br />fluctuation. Water Levels era highest (ehalloree t) after the spring eaowpack runoff which <br />recharges the aquifer. Of tan, bedrock li.e., eon-alluvial) aquifers exhibit a lag time <br />betreea spring runoff and highest water levels. Water levels then decrease (deepen) <br />e^ late summer or fall approaches. Moat wells exhibited water levels this year that fell <br />within chair historic ranges. <br />Water Quality. Table 3 IAppendix A1, Summary of Ground water Nonitorlaq wells, deecribea <br />Ue relic that were sampled, the sample frequency during this year, and alto <br />cDaractaristlce. Table 6 (ApDeadix AI ahors the ground water parameter list vend for all <br />calla. Analyses Dave Deer performed Dy ACZ Laboratory in Steamboat SDringe, Colorado <br />since Nay 31, 1983. ACZ Laboratory performs all analyses by EPA or equivalent methods. <br />Samples are delivered the day of collection to the lab .a an iced cooler. <br />The folloriaq discussion of the abalytical data collected during the reporting period ie <br />arranged by strata being monitored and coincides with the format (by aquifer type) is <br />rhich the analytical data are presented is Appendix D. TDe following discussion of water <br />quality rill limit itself to a description of total dissolved solids (TDS). A separate <br />section, Comparison of Ground Water Quality to Water Use Standards, will list those <br />samples that exceed water use standards. <br />Data for each well in this appendix begins with a listing of the water quality data <br />collected during this year, followed by remarks explaining the sampling procedure. TDis <br />ie followed by a plot of TDS versus time for the entire period of record. The regression <br />line on this plot is generated by a method known ae LOWESS (Locally Weighted Scatter Dlot <br />Smoothing). A smoothness factor of 1 (on a scale of 0 to 1) was used, which glues maximum <br />smooching. Finally, this plot is followed by a table listing historic TDS values and <br />percent milliequivaleats for major ions. <br />After a review of the Seneca II-N 1995 ABR, the CDMG requested (in a November 12, 1996 <br />letter) historic values for TDS and sulfates at uygradient sad downgradi ant alluvial walls <br />oa Hubbersoa Gulch and Sage Creek. Those data have been provided is Appendix DI is the <br />form of <br />d time versus concentration <br />ti <br />h <br />l <br />iff plots. By overlaying these plots <br />i <br />b <br />d on a light table or <br />d <br />k <br />rin <br />or, a <br />ve d <br />t <br />e re <br />erence is concentrat <br />ons may <br />e observe <br />. Requeste <br />Dry Crea <br />4 <br />