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Valley Water Treatment Page 3 <br /> Corrective Action Plan <br /> ' GPE Project No.480.3 <br /> December 12,2006 <br /> ' If a soil vapor extraction system were constructed, the existing MW-1 could <br /> be used as an extraction well. Costs would include two, 1,000-pound carbon <br /> filters, at the surface equipment, and system monitoring on a twice a week <br /> ' schedule. Assuming the system were installed and operated for one year, and <br /> that no changes of carbon were needed, the following table summarizes the <br /> major anticipated costs: <br /> Item Unit Cost Units Total Cost <br /> System Design&Plan $4,000 1 $4,100 <br /> Surface Equipment $5,000 1 $5,000 <br /> Carbon and Canisters $4,000 2 $8,000 <br /> Air Permitting $1,500 1 $1,500 <br /> System Operation $2,500/Mo 12 $30,000 <br /> TOTAL $48,500 <br /> 1 Soil Vapor Extraction with Air Sparging <br /> In cases where the contaminant mass extends below the water table, <br /> sparging of air or other oxygenating gasses below the groundwater surface is <br /> ' usually helpful in expediting the removal of the contaminant mass as <br /> compared to vapor extraction alone. It clearly is even more, expensive than <br /> ' simple vapor extraction, however, and is therefore unlikely to be cost- <br /> competitive with excavation. <br /> ' Excavation <br /> In general, excavation has the virtue of rapidly removing contaminant mass <br /> from the subsurface environment, but it is frequently not an attractive <br /> remedial alternative due to the high expense. In this case however, the very <br /> limited volume of impacted soil in conjunction with the shallow depth mean <br /> that a very small excavation can have a profound effect in removing the bulk <br /> of the contaminant mass. We estimate that a total excavation of 30 to 50 <br /> cubic yards of soil will achieve the desired effect, and will cost about $17,000. <br /> Evaluation <br /> Comparison of the virtues of the various alternatives described above, <br /> ' suggest that a limited excavation offers the best method of mitigating this <br /> release. <br /> 4.0 SCOPE OF WORK <br /> The following tasks will be completed to accomplish the goals of this Work <br /> Plan: <br /> 2937 Veneman Ave.,#13240 Geo-Phase Environmental Inc. Phone(209)569-0293 <br /> Modesto,CA 95356 Fax(209)569-0295 <br /> 1 <br />