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1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />Table 9a <br />DATA ACCURACY <br />(Continued) <br />1. VC - vinyl chloride CCL4 - carbon tetrachloride <br />BENZ - benzene CHCL3 - chloroform <br />PCE - tetrachloroethylene <br />2. CRM = Certified reference mixture <br />3. ppb - parts per billion <br />Concentration of analyte recovered <br />4. Recovery (percent) = Concentration of analyte in CRM x 100 <br />(Concentration of analyte recovered <br />5. Accuracy (percent) = - Concentration of analyte in CRM) x 100 <br />Concentration of analyte in CRM <br />6. Standard deviation: same for recovery and accuracy <br />5-13 <br />Rev. 0 09/20/88 <br />