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Technical Memo - SILV-EX Spill Monitoring Report <br />SUMMARY FOR QUALITY CONTROL ON VOLATILES: <br />All Sample had expected returns on both Internal Standards and Surrogates. <br />Values are summarized in the table below with low and high returned values. <br />Compound Returned Range Acceptance Range <br /> ug/L ug/L <br />1,4-dichlorobenzene-d4 49.38-50.12 47.5 - 52.5 <br />Pentafluorobenzene 49.66-51.67 47.5 - 52.5 <br />1,4-difluorobenzene 48.75-50.33 47.5 - 52.5 <br />Chlorobenzene-d5 49.82-51.67 47.5 - 52.5 <br />Dibromofluorobenzene 193.83-211.67 180 - 220 <br />Toluene-d8 189.67-213.44 180 - 220 <br />4-Bromofluorobenzene 191.45-199.86 180 - 220 <br />Duplicates for Organics: Original Value Reported Value % Difference <br /> mg/L mg/L <br />MC-3B <0.01 <0.01 0.00% <br />Spikes for Organics: Reported Value Original Value Spike Value % Recovery <br /> by volume % by volume % by volume <br />MC-3B 0.99% 0.00% 1.00% 99.00% <br />Spike was undertaken wit h raw concentrate SI LV-EX. Values are reported on % volatile by volume. <br />Mountain Coal Company 05-01 <br />