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by a California-certified laboratory for TPH as gasohne6 using EPA Method 8015-Modified and for BTEX using EPA Method 8020 Samples will be collected either by directly pushing a pre-cleaned brass tube into the mass of soil in the aeration area until the tube is filled The tubes will be sealed by placing Teflon® film over the ends and ' securing it in place with plastic caps Each tube will be labeled with a unique sample number, date and time of sampling, project name and number, and sampler's initials The tubes will then be placed in a Ziploc®-type plastic bag, sealed, and placed on ice in a cooler for shipment to the laboratory If sampling confirms that the concentrations are below action levels, four additional samples will be collected and analyzed to verify that the entire mass of affected soil has met the action levels The proposed initial and follow-up sampling locations are shown in Figure 5-3 The spacing of the samples will be adjusted as necessary, depending on the total area ultimately required for the aeration If these four samples also meet the action level requirements, the aeration process will be considered complete If any of the samples exceed action levels, the soil will be aerated further, and resampled as before If only a small area of soil appears to exceed action levels, the aeration will focus on this remaining volume of soil Once the aeration process has been completed, the site will proceed to closure Wet W ather Contingency Plan ' Because the aeration process may carry over into the rainy season, wet weather contingency measures are required As noted earlier, the affected soil will be confined by straw bales If wet weather threatens, the affected soil will be covered with HDPE to prevent the rain water from coming into contact with the soil Covering the soil will eliminate concerns over contaminated run-off, and minimize the ramount of drying that would have to occur after each rain event To ease the movement of the HDPE, it will be placed on rollers, allowing simple covering and uncovering The edges of the plastic will be secured by weighing it down with cinder blocks Under this scenario, aeration could continue into the early part of the rainy season because ' the time between rain events would be relatively long 6 The excavation confirmation data will show whether diesel constituents are also present above levels of concern Based on the available data, it is unlikely that analysis for TPH- diesel will be required for the aerated soil 5-7