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ON-S ITE • Keep instrument from direct sunlight. • The more stable the environment, ie. temperature. the better the results. If possible provide a shelter for the instrument. • Maintain a separate field anal i al log book for instrument at each site. • Document all problems and instrument performance checks in the instrument log book and the field analytical log. • To avoid losing data, change batteries every 4 hours. The instrument does not warn the user that the battery is low. • Use the battery eliminator if you have a stable electricity source. • The batteries in the instrument are NICd and wid overcharge if left plugged in for extended periods of time. • The TAT has developed on-site data manipulation and reporting lotus macros for daily field use (see SOP). • All data stored in instrument will be lost if the batteries are disconnected for extended periods of time- Download data daily to prevent data loss. • Do field QC checks and act on data that falls outside established ranges, i.e. reanalyze, rehomogenize or repeat energy calibration. POST-SA,MPI I`(-, A-ND PRF- FPORTI-T • Do a QA verification on data that is to be used as :'screening pius 10 definitive' category data. • Use the TAT guidelines for QA verification of both .XRF data and for "screening plus 10 % definitive category' data- • Conduct correlation and regression analyses for XRF versus "definitive category' sets. Lotus macros for this are available. • Correlation and comparability between the "definitive category' data set and Spectrace data sets are usually good. However the predictability of anv one result to its confirmation sample may vary based on numerous factors (eg. soil type, contaminate type and form, deposition mechanism, mixing of samples, QA/QC on samples). Generally an r-squared value > 0.75 is acceptable.