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Julian Munoz <br /> n February 11, 1987 2 'WEISSASSOC/g7FS <br /> t � <br /> Task 1 - Soil sampling in the tank cluster and chemical analysis of the <br /> samples . <br /> Task 2 - Soil boring and sampling outside the tank cluster and chemical <br /> analysis of the samples. <br /> Task 3 - Report preparation. <br /> Each task is described below and a detailed budget is included, as Attachment A. <br /> P <br /> a <br /> F <br /> TASK 1 - SOIL SAMPLING IN THE TANK CLUSTER AND CHEMICAL ANALYSIS OF THE. SAMpLES r <br /> During tank removal WA will collect two soil samples beneath either end <br /> of each tank, for a total of four samples per tank. Eight samples will be <br /> collected if only two tanks are removed, or a maximum of 16 samples will be <br /> collected if all four tanks are removed. For each pair of samples, one will <br /> be collected one foot b <br /> elow the bottom of the <br /> excavation and the other two <br /> feet below the first. Undisturbed samples will be collected according to the <br /> procedure described in Attachment B. If entry into the excavation is prudent, <br /> samples will be driven into the excavation; if entry is not safe, samples will <br /> be collected from the excavator bucket. <br /> The soil samples will be analyzed by a modified EPA Method 8015, Gas <br /> Chromatography/Flame Ionization Detection (GC/FID) , for total hydrocarbons <br /> (THC) and benzene, toluene and xylenes (BTX) . The shallowest set will be <br /> analyzed on a rush overnight basis, while the deeper samples will be held r , <br /> pending analytic results. If the shallow samples indicate the presence of <br /> fuel hydrocarbons, then the deeper set will be analyzed. These analyses will <br /> help us determine the e�:tent of hydrocarbons within the tank cluster and what <br /> further work is necessary, if any. <br /> Rush turnaround analysis isimportantto keep the project moving ' and keep <br /> I <br /> overall costs down. Normal laboratory turnaround -time is at least two weeks, <br /> which is a long time to keep an excavation of this size open. Our budget <br /> description shows both staP:dard and rush turnaround costs for analysis. <br />