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FigL;re 2 - Linear trends in specific conductivity at Spoil Spring #1 indicated by monitoring data collected at three different discharge rates Explanation: Specific conductivity is an indirect indicator of sulfate and TDS concentrations, and is graphed here because there are more sample data for specific conductivity than for sulfate or TDS. Tempe Specific (Specific conductivity is the field conductivity adjusted for sample temperature.) The dashed line is the rature conductivi linear trend indicated by the graphed monitoring data. The equation for the linear trend is shown. A Field correc ty higher R-squared indicates a better fit of data to the linear trend. Data for three different discharge rates Sample Discharge condu tion (umhos/c are graphed separately to remove dilutional effects caused by varying discharge. date (cfs) ctivity factor m) Low-/low data: 2/24/93 0.011 2610 1.45 3785 3/25/93 0.011 2670 1.21 3231 9/28/93 0.010 2550 1.18 3009 10/15/97 0.012 2800 1.30 3640 4/21/98 0.012 2850 1.11 3164 1/11/99 0.014 2400 1.37 3288 3/9/99 0.014 2125 1.27 2699 Intermediate flow data: 5/25/95 0.078 2660 1.24 3298 1/26/96 0.079 2250 1.45 3263 2/9/96 0.079 2700 1.21 3267 6/27/96 0.079 2300 1.21 2783 1!7/97 0.079 2400 1.45 3480 6/17/97 0.079 2800 1.13 3164 6/3/98 0.079 2800 1.OB 3024 5/4/99 0.079 2575 1.18 3039 Hlgh flow data 7/11/96 0.162 2400 1.04 2496 10/9/96 0.162 1620 1.13 1831 8/19/97 0.162 2900 1.06 3074 9/10/98 0.162 2550 1.24 3162 6/14/99 0.162 2125 1.21 2571 Low flow (0.010 to 0.014 cfs), 7 samples 4000 ~~ E 3500 a 3ooD U L 2SOO u E 2000 ~~ E 1500 a 1000 d' ~~ o- o- h 5 6 6 1 1 e e a a ~09 A o9 A e 9 n A ~09 ~ o~ 9 0~ A Fa P° Fa PJ Fa P° Qa PJ Fa PJ 4a Pv Fa P~ Intermediate flow (0.078 to 0.090 cfs), 8 samples _~ ~ 3500 ~ ~ a 3000 u t zsoo E 2D00 g -~ 1500 taoo m h~9~ `ti ti y\9h 5~9y ~y6 00'6 h~96 h~96 y\91 X91 X91 ~~91 h~90 y~g0 X90 y~o,0 y~9~ h~9~ ry ry ti ti ti ti ti ti ti ti ry ti ti ti ry ~~ ,~ a y~ 0~ ye y~ ~~ ,~ a ye ~~ `~ ~~ a ye ~ 1 , , , Division's interaretation In the three graphs, the strongest trend (highest R- squared) is shown in the high flow graph, which shows an increasing trend. The Division believes, however, none of the three graphs have a high enough R-squared to firmly indicate whether specific conductivity is increasing or is decreasing over the long- term. The data set in each of the three cases is too small or is too variable to confidently project the spring's long-term water quality. High flow (0.162 cfs), 5 samples '> 3500 ~ ~ a 3000 c 2500 0 ~ E 200 c E ... ~ 1500 a i a v) 1000 6 0 9 0 6 1 1 1 1 1 1 0 0 0 0 0 0 °~ °, 9 9 0 o, 9 9 ci 0 9 0, o, 9 9 9 ~ 0 ~ ~, ~ 4, c ~ ~ , c • a a a~ ,J aQ o a ~a a~ ,J ~d o ~ ~ ,•a ~a a~ I ~ , ~ ~ y ~ ' ~ ~ ~ ~ r,€~' i~~;. ~~_~ "-,rrtlr;ae~~v' ;~'v ~ r- ,~,4,r~;w :;-cng<, t v . .c. _ .. ~</'~ ` . .~ ~n~+ f x." '~ ( ~ .. -ag 25t ~C -.'-:~ 3 ~ „"\ i7F- .Y~ t'\DYTYyt r 3-, t~R.Y.