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• <br /> Approximate costs for conventional bioremediation are as follows <br /> Soil Volume, cubic yards 250 500 750 <br /> Item <br /> Sampling and Analysis $8,800 $14,800 $20,800 <br /> Berm Construction 1,000 1,300 1,500 <br /> Liner 11,300 22,500 33,800 <br /> Sand 2,300 3,600 4,900 <br /> Leachate Recycle System 2,000 2,300 2,600 <br /> Soil Tilling & Watering 4,600 6,000 8,000 <br /> Final Disposal 2.000 3.000 4.000_ <br /> Total 32,000 53,500 75,500 <br /> $/cubic yard 128 107 101 <br /> 2 3 3 On-site Hybrid Thermal/Biological Treatment <br /> As was previously stated, soil at the Stockton site has been impacted by <br /> both gasoline and diesel fuel components It is well known that gasoline <br /> lie can be removed from soil be aeration Current air pollution control <br /> regulations limit the amount of gasoline impacted soil that can be aerated <br /> per unit time and as a result, aeration can be rather slow and still pose <br /> environmental emissions problems While technically effective for <br /> gasoline, aeration has little success in removing diesel and higher boiling <br /> hydrocarbon fractions from soil <br /> Bioremediation as discussed above has been shown to be effective in <br /> removing both gasoline and diesel constituents from soil In most cases, <br /> gasoline removal is most likely via aeration rather than bio-oxidation and <br /> has the drawback of creating air emissions For bioremediation of any <br /> organic to be successful, the environmental conditions including <br /> temperature, moisture, nutrient levels, oxygen, and presence of inhibitors <br /> must be carefully controlled Extreme heat (above 100 degrees F), <br /> dryness during summer or cold (below 60 degrees F), and rain in winter <br /> sometimes make effective control of conventional bioremediation difficult <br /> In addition, high initial hydrocarbon concentrations can make initiation <br /> of the necessary biochemical reactions slow <br /> MARK proposes to use a hybrid combination of the above two processes <br /> that takes advantage of each of their respective benefits while eliminating <br /> or minimizing their drawbacks This process is illustrated in Drawing 2-3 <br /> 2-6 <br /> COMPANY CONFIDENTIAL TRADE SECRET AND PROPRIETARY INFORMATION OF THE MARK GROUP Inir <br /> s� � <br />