Figure
5. Concentration estimates of total petroleum hydrocarbons for performance evaluation
of diesel in water standards analyzed during laboratory trials ................................
6
6. Average concentration estimates and standard deviations of total petroleum hydro-
carbons for laboratory soil samples spiked with gasoline .......................................
6
7. Average concentration estimates and standard deviations of total petroleum hydro-
carbons for laboratory soil samples spiked with diesel fuel ....................................
7
8. Average concentration estimates and standard deviations of total petroleum hydro-
carbons for organic-free water spiked with gasoline during laboratory trials .........
7
9. Percent recoveries and relative standard deviations for performance evaluation
materials analyzed during the field trial ..................................................................
8
10. Percent recoveries and relative percent differences established for the matrix spike
duplicates .................................................................................................................
9
11. Relative percent differences for the sample duplicates ..................................................
9
iv
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