Bright brownish or reddish colored soil or saprolite layers encountered during excavation are likely to be result in acid sulfate soil problems if exposed to the air.

Question

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Bright brownish or reddish colored soil or saprolite layers typically indicate the presence of oxidized iron, suggesting that the soil has already been exposed to air and is not indicative of acid sulfate soil conditions. Acid sulfate soils are usually identified by the presence of grayish, blueish, or greenish colors when unoxidized, indicating the presence of reduced iron sulfides which can produce sulfuric acid when exposed to air.

Bright Brownish or Reddish Colored Soil or Saprolite Layers Encountered