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Valley Water Treatment Page 3 Corrective Action Plan GPE Project No,480.3 December 12,2006 If a soil vapor extraction system were constructed, the existing MW-1 could be used as an extraction well. Costs would include two, 1,000-pound carbon' filters, at the surface equipment, and system monitoring on a twice a week schedule. Assuming the systems were installed and-operated for'one year, and that -no changes of carbon were needed, the following table summarizes the major anticipated costs: Item Unit Cost Units= Total Cost System Design & Plan $4,000 1 $4,100 Surface Equipment $5,000 1 $5,000 Carbon and Canisters $4,000 . 2',' $8,000 - Air Permitting $1,500 1 $1,500 System Operation i $2,5001Mo 12' $30,000 TOTAL $48,500J Soil Vapor Extraction with Air Sparging In cases where the contaminant mass extends, below the water table, sparging of air or other oxygenating gasses below the groundwater surface is usually helpful in expediting the removal of the contaminant mass as compared to vapor extraction alone. It clearly is even more, expensive than simple vapor extraction, however, and is therefore unlikely to be cost- competitive with excavation. E Excavation In general, excavation has the virtue of rapidly removing contaminant mass from the subsurface environment, but it. is frequently not an attractive remedial alternative due to the high expense. In this case however, the very limited volume of impacted soil in conjunction with the.shallow depth mean that a very small excavation can have a profound effect in removing the bulk of the contaminant mass. We estimate that a total excavation of 30 to 50 cubic yards of soil will achieve the desired effect, .and will cost about $17,000. Evaluation Comparison of the virtues of the various alternatives described above; suggest that a limited excavation offers the best method of mitigating this release. 4.0 SCOPE OF WORK The following tasks will be completed to accomplish the goals of this Work Plan: 2937 Veneman Ave.,#B240 Geo-Phase Environmental Inc. Phone(209)569-0293 Modesto,CA 95356 Fax(209)569-0295