Figure: 30 TAC §350.73(f)(1)(A)

Soil-Water Distribution Coefficients (Kd) for Aluminum and Lead
  pH < 5 pH 5-9 pH >9
Sandy
Soil
Loamy
Soil
Clayey
Soil
Sandy
Soil
Loamy
Soil
Clayey
Soil
Sandy
Soil
Loamy
Soil
Clayey
Soil
Aluminum 3,980 3,980 44,600 35,300 35,300 35,300 353 353 353
Lead 10 10 12 234 597 1,830 234 597 1,830
Sandy Soil: <10% by weight clay, organic matter, and iron and aluminum oxyhydroxides.

Loamy Soil: 10-30% by weight clay, organic matter, and iron and aluminum oxyhydroxides.

Clayey Soil: >30% by weight clay, organic matter, and iron and aluminum oxyhydroxides.