1998-03-23_REVISION - M1977348 - Laserfiche WebLink

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L t 1 L! 1 SAMPLE MAXIMUM HOLDING TIMES Idavsl from: Field From: 1312 From: Prepara- Total Collec- extrac- tive Elapsed tion tion extrac- Time tion To: 1312 To: Prepara- extrac- tive To: determi- tion extrac- native tion anal sis Volatiles 14 NA 14 28 Semi- volatiles 14 7 40 61 Mercury 28 NA 28 56 Metals, except 180 NA 180 360 mercury NA Not Ap licable If sample holding times are exceeded, the values obtained will be ~:ansidered ' minimal concentrations. Exceeding the holding time is not acceptable in establishing that a waste does not exceed the regulatory level. Exaaeding the holding time will not invalidate characterization if the waste exceeds the ' regulatory level. 9.0 METHOD PERFORMANCE 9.i Precision results for semi-volatiles and metals: An eastern soil with high organic content and a western soil with low organic content were used for the semi-volatile and metal leaching experiments. Both types of soil were analyzed prior to contaminant spiking. The results are shown in Table 6. The concentrations of contaminants leached from the soils were consistently reproducible, as shown by the low relative standard deviations (RSD:s) of the ' recoveries (generally less than 10 Y for most of the compounds). 9.2 Precision results for volatiles: Four different soils were spiked ' and tested for the extraction of volatiles. Soils One and Two were from western and eastern Superfund sites. Soils Three and Four were mixtures of .a western soil with low organic content and two different municipal sludges. Th~~ results ' are shown in Table 7. Extract concentrations of volatile organics from the eastern soil were lower than from the western soil. Replicate Teachings of Soils Three and Four showed lower precision than the leachates from the Superfund soils. 1 1312 - 20 Revision 0 November 1990