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FORWARD COST ESTIMATE SUMMAR CLOSURE0 187.6 -ACRE n Notes: (1) The unit costs for the synthetic final cover materials and installation, drainage control system features and erosion control are based on a recent bid (May 2008) prepared by Boston Pacific, Inc for remediation and closure work at the Jamestown Landfill located in the same general region (See Attachment No. 1). (2) Unit costs includes excavation, preparation and compaction of the foundation and vegetative layers. Earthwork pricing is based on a recent bid provided by Guinn Construction to Allied for their last lined cell to be constructed in 2008 (See Attachment No. 1). Cost also assumed that all materials necessary for the foundation, low -permeable and 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 Allied's professional CQA consultants (Geologic Associates). The per day cost for a CQA professional, equipment, and vehicle is $1,500. 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 2002 PCPCMP and current regulations under 27CCR and the cost per test provided by Geologic Associates for earthwork and Precision Labs for synthetics. Geosynthetic testing frequencies are established by the Geosynthetic Research Institute and are completed at rate of 1 test every 100,000 sq ft. Laboratory costs are estimated to be $218,433. In addition, the final CQA report certifying proper installation of the cap is another $20,000. (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 worts, coordinating CQA activities, meetings, liaison between design engineers and contractors, etc. Forward Landfill PCPCMPR Z:\PROJECTS\Allied Waste\JN81013 5 yr Review Plan\PCPCMP Amend 3 July 08\JRBTable3 Clos Cst; Revision 1: 7/10/2008 Page 2 of 2