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What is the best method for determining the % of organic material in soil. We are screeening soils to remove roots etc to increase useable fill and need to determine the amount of organic material remaining.

To Risk Taker, Soil will be placed as backfill at 95% modified proctor starting well below the water table up to final grade.

To Fattdad, Thanks for the help. I'm told that the SC soils are excluded due to liquifaction concerns during a siesmic event.

To Brownbagg, I've seen carpenters drive 1/2" bolts and mechanics use 16d nails as cotter pins and learned that experts come in many forms. I've also found that 'experts' who are uncomfortable with being questioned usually aren't as proficient as they claim. If the decision may cost...

To Fattdad, The specification references ASTM D 2487 for soil classification. For our backfill SC soils or any dual classification with SC are not allowed while SM soils are suitable.

We have some lab results that classify soil as SC without corresponding Atterburg limits. The sieve analysis show less than 25% passing a #200 sieve. When questioned how the classification was reached the respons was it was based on field observation. Is it reasonable or possible to discern...