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per week until it has dried Once the soil has dried, the soil will be <br /> aerated three days per week, for eight hours per day intense aeration <br /> will maximize the air/soil contact and will expedite the remediation <br /> process <br /> The soil will be aerated with a harrow, attached to a conventional <br />' tractor Using a harrow instead of more conventional tilling <br /> equipment will minimize damage to the underlying paving The <br /> breathing space of the tractor operator will be monitored with a direct- <br /> reading instrument to ensure that proper protective equipment is <br /> utilized, if necessary <br />' Because the constituents of concern are relatively volatile, the aeration <br /> process is expected to proceed quickly once the soil has been dried <br /> Therefore several confirmation soil samples will be collected <br />' approximately four weeks after the start of the aeration periods One <br /> sample will be collected from each quadrant of the aeration area The <br /> sample will be analyzed for TPH as gasoline and BTEX by a California- <br />�' certified laboratory The samples will be analyzed on regular turn- <br /> around basis <br /> If the sample analysis shows that the constituents of concern are <br /> generally below the cleanup criteria, the aeration confirmation <br /> sampling program will be implemented (see below) If constituents are <br /> still generally greater than the cleanup criteria, aeration will be <br /> continued for another two weeks The soil will then be sampled as <br /> before If the aeration process cannot be completed prior to the start of <br /> the wet season (estimated to be between November 1 and November <br /> 15), the soil will be covered and active aeration will take place only on <br /> clear days until the end of the wet season (estimated to be March 15) <br /> ' The wet weather contingency plans are described further below <br /> Once the aeration has been completed, and the TPH and BTEX <br /> 1 concentrations in the soil are below action levels, the fence and the <br /> straw bales will be removed The treated soil will be spread out along <br /> ' the western (unpaved) area of the site (Figure 5-3), and may be used to <br /> fill in low spots in this area <br /> Acrat• 1 <br /> As indicated above, the first set of aeration confirmation samples will <br /> be collected approximately four weeks after initiation of the aeration <br /> process Four samples will be collected The samples will be analyzed <br /> 5 This estimatred time period may be modified due to weather conditions that would be <br /> anticipated to delay or expedite the progress of the aeration <br /> 5-6 <br />