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Abstract: Aspects of Lead in West Dallas, Texas, Soils

James L. Carter Ph.D., Norai Ibrahim

Detailed geochemical study of thirty-eight 30 cm long Previous HitsoilNext Hit cores taken within a 1600 m radius of the RSR secondary lead smelter, West Dallas, Texas, reveals total lead values up to 35,100 ppm with the highest values occurring within 650 m of the smelter. The Previous HitsoilNext Hit lead is 90 percent or more readily mobile in cold 2N nitric acid, and shows an exponential-like decrease with distance from the smelter. Lead isopleth maps show that wind played an important role in dispersing the lead in a NNE direction from the smelter to a distance exceeding 1600 m. Migration of lead down the Previous HitsoilNext Hit profile generally shows a rapid decrease with depth. However, some cores have complex multiple lead-rich layers suggesting bioturbation and desiccation "cracking" of the Previous HitsoilNext Hit to be important physical processes for vertical redistribution of the lead. Some Previous HitsoilNext Hit cores from previously remediated areas reveal surface recontamination with lead as high as 1300 ppm. One core has 12 cm of lead-free Previous HitsoilNext Hit on top of a normal Previous HitsoilNext Hit profile with lead values as high as 18,000 ppm in the organic-rich surface layer of the buried Previous HitsoilNext Hit. The data also reveal that as much as one-half of the Previous HitsoilNext Hit cores with lead levels higher than 500 ppm, at the cm-scale, will be miscategorized as non-toxic by using the average Previous HitsoilTop sampling method.

AAPG Search and Discovery Article #90960©1995 AAPG Southwest Section Meeting, Dallas, Texas