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Supplemental LFG Emission Control System Cost Estimates for <br />Preliminary Closure Cost Estimate <br />The LFG Emission Control System will be constructed throughout the life of the landfill, and the majority of the system will be in place at closure <br />At closure, it is anticipated that a portion of the above -ground components will be rebuilt, and some of the vertical LFG Wells will be replaced. <br />Specifically: <br />2004 Cost 2009 Cost (3) <br />9.1 Repair of above -ground field components at 30% of orginal const. at $178,000 (1) _ $53,400 $60,300 <br />9.2 Well Replacement Costs at 15% of well costs at $717,750 (2) = $107,663 $121,700 <br />(1) Sum of Items 1 and 2 from cost estimate below. <br />(2) Subtotal of above -ground field components, from cost estimate below. <br />(3) Factor 1.13 for CIWMB inflation; see Unit Cost Basis table. <br />Landfill Acreage 185 <br />No. Item <br />LFG Emission Control System Cost Estimate* <br />North County Landfill <br />Unit Cost Unit Qty Extn Note <br />1 <br />Vertical wells 10 contingency wells <br />$65 <br />LF <br />3500 <br />$227,500 For special gas issues <br />2 <br />Horizontal wells 24 wells in two layers <br />$25 <br />LF <br />19610 <br />$490,250 Primary gas collection <br />3 <br />Buried 10" gas, 1" air & 2" water HDPE <br />$28 <br />LF <br />12000 <br />$336,000 Looped perimeter header <br />4 <br />Sumps with header sample ports <br />$12,000 <br />Each <br />12 <br />$144,000 In the header system <br />5 <br />Perimeter monitoring wells <br />$6,000 <br />Each <br />15 <br />$90,000 1000 foot spacing (2) <br />6 <br />Misc items and contingency (1) <br />$299,438 <br />LS <br />1 <br />$299,438 <br />Subtotal, buried <br />field components <br />$1,587,188 <br />7 <br />Header Valves and well connections <br />$1,226 <br />Each <br />46 <br />$56,400 <br />8 <br />Above -ground Lateral pipe - 4" HDPE <br />$5 <br />LF <br />1000 <br />$5,000 <br />9 <br />Above -ground Subheader pipe 6" & 8" HDPE <br />$13 <br />LF <br />1000 <br />$13,000 <br />10 <br />Above -ground Header pipe 12" HDPE <br />$22 <br />LF <br />0 <br />$0 <br />11 <br />Condensate Return Drains <br />$2,000 <br />Each <br />34 <br />$68,000 <br />12 <br />Misc items and contingency (1) <br />$35,600 <br />LS <br />1 <br />$35,600 <br />Subtotal, above <br />-ground <br />field components <br />$178,000 <br />13 LFG Flare station <br />Subtotal, LFG Field $1,765,188 <br />ea 1 $400,000 <br />Total $2,165,188 <br />* Source: San Joaquin County, Rev March 16, 2005; in 2004 costs <br />LFG System construction occurs throughout the life of the landfill, and is not a component of the closure cost. <br />(1) Includes budget to install additional wells to control isolated LFG emission problems. <br />(2) Assumes no future development near the landfill <br />PCPMP for NCRCSL <br />O:ISan Joaquin CountyWCRCSL11180401PCPMPIFinal Reportl <br />Appdx D_LFG Cost Estimate_Jan_2010.xts Department of Public Works/Solid Waste <br />D-5 County of San Joaquin - Rev. 02 July 10, 2009 <br />