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Figure 4 -Water level and sulfate concentration in spoil well GW-N27 Division's Interpretation of the graph shown below 1) The water level in the well rose during each irrigation season (late summer to tall) due to irrigation water seeping into the spoil aquiler Irom the Mid-Lower Wesl Return Ditch; 2) The water level in the spoil aquifer dropped alter each irrigation season as the spoil aquiler continued to discharge from Spoil Spring k 1, but the ditch stopped seeping into the aquiler; 3) A thin front of seeping irrigation water lirsl reached well GW-N27 in late 1992, causing sulphate concentrations in the well to drop just below 2000 mg/I; 4) By 1998, fresh irrigation water had inundated the entire saturated zone in well GW-N27 and sulphate concentrations dropped to the 500 mg/1 concentration that has previously been reponed for water in the Mid-Lower West Return Ditch at sample point SW-N6 (page D-7 0l 1987 Annual Hydrology Report). 5625 5620 C 0 > 5615 d d d 5610 d 3 5605 5600 ,, . ~. ~ ~z ,~ k, > s~'- 4 { , sfi~- +~ . r.. ~' ^ 4 ~ e ~ ~ Y ~ 4 L D y .i ,,y jli.fn !d .y \. ` ~ t i J Y, ~.~'- k i ~ ~ t e . ~ w'ta !, z r ' . ., N tr ~> .Y.vFC C^ d~Y~ .14 i _ ~~ ~~. .. ' t tLt- ~ ~ \ - ~ ~ ~ 4' -f Y l/1: i ~ ~ t j _ .. .. k :vS ~ ~ ~ . .. tad {+ ~ !y„q, n ~ i p,*~ .t rq.R. scr i. '~. _ g. v ~ ~ W!` ~~ ti. t'~ eN r ~ t , ~ y. .4r e y ~t ' z., 2500 2000 1500 1000 y 500 0 00 99 0°' ~~ 90 A^ 0, Av Ati 0`3 A~ 9h 9b 9g ~h 96 96 A~ 0'1 90 90 O°~ PQ~ O°~ PQ~ O°~ PQ~ O°~ PQ~ O°~ PQ~ O°~ PQ~ O°~ PQ~ O°~ PQ~ O°~ PQ~ O°~ PQ~ O°~ --Water level ~ Sulfate