ARCHIVED REPORTS XR0008210 - Laserfiche WebLink

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SOIL REMEDIATION As was shown in the above mentioned report concerning the pilot - test, vapor extraction using characoal absorbtion will be the best _ option for remediating the soil to the 40 foot depth, and should also have a positive impact on the ground water plume beneath the site. Cameron Yakima state that their activated charcoal has an absorbtion for gasoline range hydrocarbon of approximately 30% of the charcoal weight. We have found that this absorbtion rating is closer to 25%. Using the above estimate of pounds of hydrocarbons to be removed, 2268 lbs. and a 25% absorbtion by weight for the charcoal, 9,072 lbs. of activated charcoal is needed. Cameron Yakima rents a 20,000 lb. activated Charcoal reactor by the month plus profiling, and disposal fees. Using this reactor with two 85 gallon activated charcoal tub scrubs (300 pounds each of activated charcoal) in series on the 10,000 lb. reactors exhaust, and increasing the flow rate from 30 scfm obtained during the pilot test, to 100 scfm by placing two Rotron DR 505 blowers in parallel, this will also increase the vacuum almost 2.5 times should remove approximatley 200 lbs. of hydrocarbons per day, during the initial week of extraction or approximately 60% of the recoverable hydrocarbons. This concentration will start to decrease in the vapor stream and the two blowers will need to be hooked in series, slowing the flog rate but increasing the vacuum rating for the duration of vapor extraction on the soil. This replumbing will take place when the daily recovery drops to approximately 75 pounds per day. s VAPOR EXTRACTION SYSTEM CONSTRUCTION t Using two DR 505 AX Rotron Blowers in parallel should increase the r flow rate by 2.5 to 3 times (increasing pounds recovered by 2 to _ T 2.5 times) and increasing the vacuum that can be exerted onto the formation by 1.75 to 2 times. Manifold vapor extraction wells EX, P1, P3 and ground water monitoring wells MW1 and MW5 to two explosion proof, DR 505 AX Rotron Blowers hooked in parallel. At each well head a air tight manifold Tee will be plaead with a needle valve to control the influence "vacuum" on the well, and a orifice sample port sleeve to measure vapors, temperatures and flow rates at the well (this orifice sample po.z, valve assembly can also be placed on a common manifold at the treatment compound, with individual tubing runs to the wells) . Ground water monitoring wells MW2, MW3, MW4 and MW6 will be used as vacuum influence wells. A sample port to measure, vapors and vacuum is already in place on the well caps. These wells may also be converted into hot air injection wells to help enhance the page 4