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since Hay 31, 1983. ACE Laboratory partorms all a'ulyses by 8PA or aquiwlmt methods. <br />Samples era delivered the day o! collection to the lab in m iced cooler. Monitoring • <br />lrequmcies for ground rater quality may be found on Pnge 15-3-3 oL the Smaca II-Si PAP. <br />The folloring discussion of the analytical data collected during the reporting period ie <br />arxmged by strata being monitored amd coincides rith the format (by aquifer type) in <br />which the analytical data era presented in Appendix D. The lolloring discussion o! rates <br />quality rill limit iteal! to a description of total dissolved solids (TDS). A separate <br />section, Comparison of Ground Sinter Quality to Water Uee Standards, will list those <br />samples that exceed rater use etmdarde. <br />Data !or each call in this appendix begins rith a listing o! the rater quality data <br />collected during this yeas, lollowed by remarks ezplaiainq the eempling procedure. This <br />ie followed by a plot o! TDS versus time !or the entire period o! record. The regression <br />line on this plot ie generated by a method known ae LOWESS (Locally Siaighted Scatter plot <br />Smothinq). A emoothneas factor o! 1 (on a scale of 0 to 1) ras used, which gives maximum <br />smoothing. Finally, this plot ie follored by a table listing historic TDS values and <br />percent milliequivalmts !or major ions. • <br />Altar a ravier o! the Smaca II-W 1996 ASR, the CDHG requested (in a Jmuary 5, 1993 <br />letiar) that the TDS plots referred to above ba placed on the same mq/1 •eale. This, <br />unfortunately, is not possible since the computes program that generates the plots ranges <br />these values automatically. <br />Alluvium. Three relle monitor the Subbarson Gulch alluvium. Hall fiSAL6-2 is upstream o! <br />mine discharges. Its TDS plot shows a decreasing trend since 1989. This ie likely due to <br />the Pact that this pasture has been irrigated starting in 1989. Hell SiRAL7-2 aziete on <br />Hubbaraon Gulch downstream o! mine discharges from NPDES 006. Zta TD9 plot shore n elighG <br />incxaasinq trend. The May 1995 sample displayed m momalovely high TDS wlua. <br />Subsequent TDS values fall within the historic range. Siall f7SAL10 exists on 006 Gulch (a <br />Rubbarson 4111th tributary) belor NPDE9 006. TDS values at this roll display a decreasing <br />trend. <br />One wall monitors the 005 Gulch alluvium (tributary to Dry Creek). This roll, SiDALll, ie <br />normally dry. . <br />4 <br />