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APEX ENVIROTEGH PAGE 26 <br /> Porosity: 0. <br /> In this scenario theme is apPtoximately ? .pounds of dissolved hale contamination . <br /> ntaminated saturated zone. The additional near field sorptia factor of 8X is used toh <br /> sorbed material In the contaminated zone, such that the total contaminant levet is estimated be e` tirr�es account for <br /> the: level of the dissolved phase measurement, Limated to <br /> Barring direct "'iftsurements of sorbed material vne can assume a range of <br /> variable. Dally a,lower value OPPlies to,sant! and a higher value to clay. A 8Xvalue 6X to I Xs for this <br /> used in <br /> this example. <br /> The total load In the system is therefore 8 X 7 . 56 <br /> pounds of .carbon stoichlometry of .1, and an ORC oxygen content of 10%,ntaminantth s a requirement fcrd on an rY�6 4 <br /> Pounds of ORC directly into the contaminated zone to irerrr+ediate the targeted contaminant mass:: <br /> The: cast of ORC is $16,800 {based on a cost of $10 <br /> d) and is the C <br /> as a slurry via 69 Gecprobe-type holes, 1 314 inches�iinrd�i#ang OR <br /> rtteter, Spaced � uratelied b ��i6 feet <br /> on <br /> center. In this example, the full`,dose can be made in a single multi-day application. <br /> SCENARIO <br /> BM-e �L erne : Meet a RSCA standard at a compliance point 10 feet downgradient of source <br /> Drell. <br /> Dissolved Phase Contaminant Level: 30 parts per million <br /> Ground Water Velocity; 0.2 foot per day <br /> Near Field Sorbed Mass Factor. 8 <br /> Source Area Dimensions. 50 feet;X S4 feet' <br /> Contaminated Saturated Zone: 15 feet <br /> Porosity: 0.3 <br /> > tmcndatlsrr fictr , <br /> In the context of risk reduction, which is being implemented through the recent ,ASTM RBCA <br /> guidelines, attenuation models can now be incorporated. Closure standards now take on a different <br /> Posture. One no lamer has to consider total mass removal at the source, but rather a percentage <br /> reduction of the concentration so that contamination at a downgradient compliance well is <br /> reduced and maintained at an approved level: <br /> We recommend using the BuscheckAlcanter attenuation model for intrinsic Cnatural") <br /> attenuation and overlaying the ORC effect in order to t} reduce the sour(* and 2) enhance the rate <br /> of remediation, thus bringing about site clowre more rapidly. <br /> The full'details of the model, which is 8 modified farm of the pominico analytical solution to the <br />