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Inter•(T)ountoln loborotorlcs.lnc._. <br />- iua r.......» <br />9..~a.w wra.w mot <br />CASE NARRATIVE <br />On 15 April 1992, one TCLP extract was received by Inter-Mountain <br />Laboratories, Inc. at 1633 Terra Ave, Sheridan, Wyoming. The sample <br />custody document indicated request for analysis of parameters from the <br />TC Rule analyte list. The sample arrived cool and intact, custody <br />sheets remained with the extract. <br />The TCLP preparation and extraction was performed following the steps <br />defined by the EPA using Method 1311, SW-846, Nov. 1990 and found in <br />the Federal Register, 40 CFR 261, 901. 55, No. 126, June 29, 1990. A <br />duplicate analysis was prepazed to evaluate extraction reproducibility. <br />A matrix spike was used to determine matrix effect on recovery of target <br />analytes. Matrix spike information is used, via the TC Rule, for the <br />final calculation of analyte concentrations. Method blanks axe used to <br />determine any method induced contaminations. <br />Limits of detection for each instrument/analysis are determined with <br />respect to matrix effect, instrument perforniance under standazd <br />operating conditions, and sample dilution. TCLP results are reported as <br />mass per unit volume of leachate. Data qualifiers may be used is <br />accordance with USEPA data validation guidelines. <br />Reviewed by: <br />Thomas Bury <br />Laboratory Manage IML-Sheridan <br />Data File Id: 00-481 <br />