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Air �++ <br /> T xics a <br /> Laboratory Services Since 1989 <br /> LABORATORY N TIVE <br /> 5 <br /> TO-17-Markes ATD 1 <br /> Advanced GeoEnvironmental <br /> Workorder# 1003220 <br /> i <br /> Six TO-17 Tube (Tenax-TA) samples were received on Mar h 10, 2010. The laboratory performed the <br /> analysis via modified EPA Method TO-17 using GC/MS in th full scan mode. TO-17 sorbent tubes are <br /> thermally desorbed onto a secondary trap. The trap is thermall de sorbed to elute the components into the <br /> GC/MS system for further separation. <br /> Method modifications taken to nun these samples are summirized, in the below table. Specific project <br /> requirements may over-ride the ATL modifications. <br /> Requirement TO-17 4TL M difications <br /> Laboratory Blank At least 2 tubes from Tubes wed for daily lab blank may or may not be from the <br /> the same cleaning same batch or sampling media.Only 1 lab blank is <br /> batch as the samples analyzed prior to sample analysis. Lab blanks are dry <br /> are analyzed at the purged to eliminate the possibility of sample anomaly <br /> beginning and end of attributed to dry purge process. <br /> the analytical sequence. <br /> Do not dry purge Lab <br /> Blanks. <br /> Method Detection Limit Follow 40CFR Pt.136 The MDL met all relevant requirements in Method TO-17 <br /> App. B (statistical MDL less than the LOQ).The concentration of <br /> the spik d replicate may have exceeded I OX the calculated <br /> MDL in some cases <br /> Receivinu Notes <br /> Sample identifications on the Chain of Custody(COC)were not unique. The tube number was added to <br /> each of the sample identifications to ensure uniqueness. <br /> Analytical Notes <br /> A sampling volume of 0.299 L was used to convert ng to ugh for the associated Lab Blank. <br /> The field blank samples Field Blank (A 10857) and Field B (A l 0898) have reportable levels of TPH <br /> (Diesel Range). <br /> The TPH pattern in sample P-5V and P-5Vdup did not resenble that of the diesel fuel. The hydrocarbons <br /> were distributed in the lighter carbon range of diesel. <br /> Definition of Data QuaWing Flags <br /> Eight qualifiers may have been used on the data analysis sheets and indicates as follows: <br /> B - Compound present in laboratory blank greater than reporting limit (background subtraction no- <br /> performed). <br /> J - Estimated value. <br /> E- Exceeds inst<ument calibration range. <br /> Page 3 of 14 <br />