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7 � <br /> Rod, r, Weston, Inc. - Stockton Laboratory <br /> Case Narrative <br /> i ',Client: DELTA TRUCK SALES <br /> Project #:L90035 <br /> `LP #: 11016 <br /> Inorganics Case Narrative <br /> Lab ID 863043 is a composite sample of the client ID's <br /> #1 #2, and #5. <br /> The arsenic spike was 55.6%, below <br /> iethedlab <br /> control <br /> limit <br /> of <br /> w the <br /> 75A- A post spike for arsenic y <br /> np$t spike control limit of 85$. control limit. <br /> _ The selenium spike was 23.9%, below the lab <br /> d 47.0$, also below the lab control <br /> The post spike yielde <br /> limit. <br /> The serial dilution results for the following analytes were <br /> above the 10% control limit: 13.6% <br /> Chromium <br /> Cobalt <br /> Nickel 19.8% <br /> Zinc 19.4% <br /> r <br /> All lab control samples. Preperation blanks, calibration <br /> F{' standards, and calibration blanks were within the lab ' <br /> established control limits. <br /> in accordance with the EPA methods <br /> Analyses completed <br /> cited with the exceptiocs noted above. <br /> �= <br /> Volatiles Case Narrative <br /> TPH-G Analysis: p zed. <br /> Calibration was verified for all samples analyzed. <br /> Surrogate recoveries were within acceptable limits- <br /> The method blank associated with this group of samples was <br /> free from target interferences. <br /> Spike recoveries were within acceptable limits- <br /> HTXE analysis: <br /> Calibration was verified for all samples analyzed. <br /> sprrogate recoveries were within acceptable limits for all <br /> samples. group of samples <br /> The method blank associated with this g p <br /> were free o4 target analyte interferences at, or above, the <br /> reporting limits. <br /> ' = spike recoveries ware within acceptable limits. <br /> Sample matrix effects prevented analyzing these samples at a <br /> lower dilution- <br /> wo <br /> pee irides Case Narrative <br /> TEH. This narrative coversthe analysis of 3 samples in <br /> accordance with 5W-845, 3rd Edition.' The specified holding <br /> time for this analysis was met. Surrogates ware not uaed in <br /> c' this analysis- spina recoveries were within acceptable <br /> -- --- - limits --however--the.-blank--spikt-has-�n law recovery which re <br /> suited in a high RFV. The presence Lntexfexing pea a-in of ----- <br /> ►, <br /> sample #1,2,5 Composite exceeded the matrix spa�ifiescany <br /> ra- x <br /> tion and required a diluted analysis, which qualifies <br /> tain any target <br /> recovery data. .` The method blank did not con <br /> rting <br /> compounds or interfering peaks at or above the repo <br /> r �< <br />