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Figure 7. <br />pH'and Electrical Conductivity of Aqueous Extracts JWh <br />from Colowyo Coal lnterburden: Water/Soil. Ratio = 1:1 5/1877 <br />Electrical Conductivity <br />mmhos/cm <br />Sample <br />\o. <br />38 <br />37 <br />36 <br />35 <br />34 <br />33 <br />32 <br />31 <br />30 <br />29 <br />28 <br />27 <br />26 <br />25 <br />24 <br />23 <br />22 <br />204 (X-R) <br />2D7 {X-F) <br />Interburden pH <br />Depth, Ft. 6.5 6.75 7.0 7.25 7.50 7.75 8.0 8.25 0 .25 .50 .75 1.0 1.25 1.50 <br />--- --- ...._____,-.............._...__...._....._r <br />0=~ ~ .~ <br />5-13 ~ -~ <br />13-22 - -~ I --~ <br />22-28 ----.____._...-~ 1II.,_.I <br />28-39 -------------+ 1 _..--- <br />41- 4 5 ---~ 1 <br />45-54 ~ ? --- <br />54 - 6 4 ---~ iJ)----~ <br />6 4 - 70. 5 --~ t - -- -- <br />70.5-80 I ----------~ I ---- <br />8 0 - 9 0 I`-----{ - <br />90-100 <br />100-110 i... _-.__.-_ <br />110-115 -..... ....._...-- ~ •--------~ ~-- <br />• I- .- <br />115-121 -..-... _.-. <br />121-123 _ <br />12Z-123 -- <br />136-137 <br />-; <br /> <br /> <br />