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of contamination llies and when the c!e=nup level's we -.itained (low level analyses). 7o assure that a !iie definition is comprehensive, it is recommended that the Minimum Veriflcztion Analyses UNIVA) listed in Table I be conducted 2sneeded to IBM determine the --r-c-it of cun"-mination. 0 L.ntor"niory Nfe!hDd0l(-,Zie! and NIVA Qas',s Mh= so We have conduc*.ed a survey of 65 DHS cerlilried laboratories in Cafifornia and found that there is wide variation in mel.hodo;ogies for an%lysis of Total Petroleum It Hydrocarbons (TPH) and B m. ene, Toluene..Xylene. and Ethylbenzene (BTX&E). Some differences incAlude s-:mple size cmd preparation. Solvents. columns and detectors used and lapses in quality assurance. Although these variations currently account for the differences in the ability for laboratories to report consisi.e.-it. dete-..able leve!s of the Compounds, The Regional Boards areworking -the laboraor.es and Stale agemc�ec, to resolve this by deve!oping cr��-Isistent and prolocol-The intent is to produce and encour:ge and more preclse protocol-Which--eill provide more reliable data to the tan"-.-cvner and re;uJa,.ory agezces. As Shown in the cost/analysis table below.labs haw routine analyses but c= Alovef their dete—Mion Emits by improving protocol. For instance.one. laboratory in Cnlirornla uses -a modified F-DA approved 324.2 (and $240) methodolcg-y iGCMS proc—edure) to produce ew.c,-pt:,on;Lllv low and ac-c-urate de!emion levels for both TPH and 3T.Y&---- at a Bille moreth=hay the price of the Wo combined. The method ffwjsed aw. r4enics) uses liquid argon to freeze the C-bemicais prior to injection into the delec.0r. This effectivelly eliminates interfering gases such as oxygen and aLlows the injection or 10 Or or the sample into the M ass Spectro'meter for =alysis (as opposed to appro--imately 10 64, by the Conventional purge and trap procedure). The increased sample size provides 2ccurate delevion and. because it analyzes everf1hing at once, lowers the cost or analysis considerably. Other advant:Zes are Lhat.EDB also is ide�lifled and second column confirmation is not needed. In the cost/analysis table the costs are based an �.ubmittal or a rather uncomplicated szmple. Labormory handling ud preparation for �'dirty'or complex --mPles may inc,-ea!e costs up to 30%. and consuhants may add a 154. sura'arge for colleviing =6 transporting the Sam;le, and inl&rpreting The re.Kults.Therefore. a bill for BT.Yk-E in soil m ay inc!u de 3 105 for the analysis - $35 for special work $20 ct;n-.M=fee tbereby lotalling $160 (or more), This may nol be Unreasonable for the circumstances.