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ALTERNATIVE 2 OEOMATRIX ENHANCED IN-SITU BIOREMEDIATION: AIR SPARGING/BIOVENTING PRELIMINARY COST ESTIMATE Pagel of 2 ' Former ContiGrouP Grain Elevator 1805 Harbor Street Stockton, California Assumptions 1 An estimated 36 sparge points and 10 soil vapor extraction wells will be installed 2 Drill cuttings and purge water will be land spread on the property 3 A new power drop is needed 4 The affected soil volume in the saturated zone is estimated to be about 7,500 cubic yards Assuming a soil bulk density of 110 ]b/cu ft or 110]b/cu ft and an average petroleum concentration of 1,000 mg/Kg,the mass of petroleum hydrocarbons in soil is estimated to be about 22,300 lbs TPH 5 Assuming the biodegradation demand ratio of about 3 35 pounds of oxygen per pound of petroleum hydrocarbons, an estimated minimum of about 75,000 pounds of oxygen is required to degrade the mass of petroleum hydrocarbons in sol] 6 Ambient air contains about 21%oxygen Assuming approximately 2%oxygen delivery efficiency in the saturated zone, an estimated 192 million pounds of air or 220 million cubic feet of air will be required 7 It is assumed that the approximately 220 million cubic feet of air will be injected at 100 scfm over the estimated remediation duration of 10 years 8 It is assummed that the 98%of the injected air that is not utilized for biodegradation in the saturated zone will be sufficent to degrade the TPH in the unsaturated zone 9 The conceptual design for this alternative(well locations,and treatment system)was developed for cost analysis purposes only,additional evaluation will be necessary for the final system design if this alternative is implemented Notes The following costs were estimated based on a conceptual design of the remedial action and readily available cost information on �1 labor and material typical for similar projects The actual costs for this project may vary depending on the final design,contract bids,agencies'requirements,and/or the availability of equipment,materials, and/or contractors at the time of final remedial action design, construction,and/or implementation TASK ACTIVITY QUANTITY UNIT UNIT S COST$ SUBTOTAL$ WELL INSTALLATION workplan 15,000 installation and pilot test workplan 1 lump sum 15,000 15,000 pre-field activities 15,000 logistics,preparation and application for well permit 1 lump sum 10,000 10,000 select contractors and survey for utilities I lump sum 5,000 5,000 veld activities 130,300 Bio-SpargeNent pilot test 1 lump sum 35,000 35,000 contractor mob/demob 1 lump sum 6,000 6,000 sparge points 36 each 1,500 54,000 vent wells 10 each 1,500 15,000 well development 150 hr 135 20,250 other mise 40,000 field work oversight,coordination 40 day 1,000 40,000 reportinjZ 25,000 Well construction logs,installation,and pilot test summary report 1 lump sum 25,000 25,000 EXTRACTION WELL SUBTOTAL $ 225,300 #f 11D0c_safe\9000s199631CAP%AppB Altematives AS 1016/20049 51 AM