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<br />~, <br /> <br />, <br /> <br />. <br /> <br />. <br /> <br />For comparison purposes, with a Wyoming high-swell ben- <br />tonite, the commonly used minimum application rate for sandy soils is <br />1.0 lbs/ sq ft of treated area. High-swell bentonite is not recommended <br />for coarse rocky or gravelly materials unless a bridging agent, such as <br />silt, sawdust, Colorado bentonite, etc., is used with it. <br /> <br />In the District area, the cost of the local pit-run bentonite <br />delivered to the site has ranged from $ 5. 50 to $ 9. OO/ton compared with <br />the on-site cost of $ 30. 00 to $ 50. 00 for the powdered Wyoming high-swell <br />bentonite in 100 lb sacks. <br /> <br />1006 <br /> <br />-5- <br />