Customer uses TD-500D to measure TPH concentrations in produced sand on an offshore oil platform in Malaysia. The sand contains high levels of crude oils and must be treated on-site prior to dumping it overboard. The TD-500D was calibrated to Sitelab's TPH calibration kit, product CAL-056. Methanol solvent was used to extract the samples. For comparison, samples were also extracted in OIW surfactant, available from Turner Designs Hydrocarbon Instruments, Inc. TPH results were very similar.