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TABLE FORWARD LANDFILL CLOSURE COST ESTIMATE SUMMARY 187.6-ACRE CLOSURE AREA 2013 ITEM DESCRIPTION QUANTITY UNIT PRICE ESTIMATED COST 11 JENGINEERING DESIGN(7) of construction cost) 1 LS $156,524 Subtotal $156,524 12 CONSTRUCTION MANAGEMENT(8) 4 ofconstruction cost) 1 LS - $313 048 Subtotal $313,048 Total Construction Cost $8,905,238 Contingency 20% $1,781,048 Final Closure Plan Prep. $40,000 Total Closure Cost Estimate $10,726,286 Notes: (1) The unit costs for the final cover materials and installation,drainage control system features and erosion control are based on a recent bid information(2011)for closure work at the Vasco Road and Big Bear Sanitary Landfills.(See Attachment No.1). (2) Earthwork costs assume that all materials necessary for the foundation,barrier/vegetative layers will be obtained from an on-site borrow source. Cost also assumes 50%of total final area as slope and a slope factor of 3:1 horizontal to vertical. (3) Cost assumes that only one foot of random soil would need to be placed for the foundation layer because one-foot of soil would already be in place. Cost also assumes scarification and recompaction of the lower in-place foot of soil as part of the preliminary grading cost item. (4) Final cover construction quality assurance(CQA)is generally based on the actual number of construction days to complete the cap. Based on the closure implementation schedule,approximately 130 construction days will be needed to install the final cover over the 187.6- acre closure area. The per day CQA utilized for this estimate was provided by one of the Operator's professional CQA consultants(Geologic Associates). The per day cost for a CQA professional,equipment,and vehicle is$1,500(130 days x$1,500/Day=$195,000). Laboratory sampling and testing is based on quantities of final cover soil and synthetic in accordance with the sampling/testing frequency outlined in the CQA Plan in the 2011 Stage 1B Partial Final Closure and current regulations under 27CCR and the cost per test provided by Geologic Associates for earthwork. Laboratory costs are estimated to be$119,691. In addition,the final CQA report certifying proper installation of the cap is another$25,000. (5) All on-site structures associated with the landfill will be removed. An administration/maintenance office trailer,as well as an equipment maintenance area,will be utilized during the post-closure maintenance period. (6) No cost is included in this category because the system is/will be in-place at closure. Currently,there are no plans to expand the monitoring system. (7) Cost is for engineering design and preparation of construction documentation(plans and specifications)for bid purposes. (8) Cost is for monitoring contractors work,coordinating CQA activities,meetings,liaison between design engineers and contractors,etc. Forward Landfill PCPCMP Amendment No.4 Z:\PROJECTS\Allied Waste\Forwa rd\Five Year Permit Rvw 2013\JTD-5 Yr PR 2013\Appendices\App A-PCPCMP 2013\Tables\Table 3-Clos Cost Estimate-2013; Amendment No.4:5/28/2013 Page 2 of 2