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Table 3-5 Fluoride Attenuation Data for Salazar Ranch Soils Using Salazar Ranch Ground Water (South Center Pivot). 1 <br /> <br />Location Depth Soil Extract <br />Concentration Fluoride Removed <br /> (ft) (mg/L) (mg F/kg soil) (kg F/ha-ft) (lbs F/acre-ft) <br />Inside North 0-1 0.75 nr 3 nr nr <br />Irrigation Circle 1-2 0.63 0.20 0.88 0.80 <br />Inside South 0-1 0.74 nr nr nr <br />Irrigation Circle 1-2 0.61 0.24 1.1 0.96 <br />Outside North 0-1 <0.10 > 1.3 > 5.7 > 5.2 <br />Irrigation Circle 1-2 0.82 nr nr nr <br />Outside South 0-1 <0.10 > 1.3 > 5.7 > 5.2 <br />Irrigation Circle 1-2 0.73 0 0 0 <br />Mean Values 2 Ll =--- 0.71 f 0.08 > 0.76 > 3.3 > 3.0 <br />I Initial fluoride = 0.73 mg/L (Table 3-1). <br />2 Below detection values not used in calculation of mean. <br />3 nr = no reduction. Fluoride concentration in soil extract was greater than the initial fluoride concentration indicating fluoride was released by the soil. <br />Example Calculation for North Irrigation Circle (1-2 ft): <br />0.73 mg F (initial) 0.63 mg F (final) 0.10 mg F removed <br />L solution <br />0.10 mg F removed <br />L solution L solution <br />0.01 L solution 1000 g soil <br />x x = <br />0.20 mg F removed <br />L solution <br />5 g soil kg soil <br />Volume Conversion Factors: <br />1 acre-ft = (acre-furrow slice) x 2 <br />1 acre-furrow slice (6 inches) = 2 x 106 pounds <br />kg soil <br />1 hectare-ft = (hectare-furrow slice) x 2 <br />1 hectare-furrow slice (15 cm) = 2.2 x 106 kg <br />p:giro)ectsl-'12 ewmont(s luis)lsmluislJarm?halom_mnchlsoilslsalazarchamaeriwdonfi=j.dm