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10%05/98 MON 11 50 FAX 925 363 7275 TERRA NAC NOR CAL [ J004 Subtask 3 4- Startup & Testing $ 9,800 One week of startup activities will include all safety shutdown testing, source testing for air permit compliance, with wells to be brought online sequentially as concentrations allow after completion of the source test ORC "socks"will be installed in wells MW-3 and MW-4 The CAP calls for laboiatory analysis of vapor samples from wells Terra Vac's inhouse laboratory cau be utilized for considerable savings over an outside, certified lab Othct than the vapor sairiplcs for the source test and air permit compliance (which also may be negotiable as we have found in other air districts), it is assumed that vapor samples foi TPH-g/BTEX will be analyzed inhouse Task 4- Operations and Maintenance $207,400 Subtask 4 1- Week 7-12 $ 30,790 It is assumed that the fiist 12 weeks will be SVE operations only, with no sparging The Retox i-mit can be monitored utilizing computer softwatei and modem in addition to weekly visit,, Weekly visits will include optimizing the system based on well opei ating pai ameters as well as maintaining equipment and periodic breathing zone monitoring Monthly inlet and exhaust samples will be collected and analyzed Subtask 4 2 - Weeks 13-52 $114,930 • Air sparging will presumeably begin aftei 12 weeks of SVE operations This task includes a shoit startup peiiod where baseline groundwater and dissolved oxygen levels will be measured, and grab samples are collected for TPHg/BTEX at six onsite monitoring wells Dissolved oxygen will then be measured periodically after sparging has begun Monthly water samples from these six wells will be analyzed foi TPH- g/BTEX and MTBE by EPA 8015/8020 Additional costs for confirmation of MTBE by EPA 8240 has not been included Costs for quarterly groundwatei monitoring, sampling and reporting are not included ORC `socks" will be changed quarterly, weekly visits will continue but we assume that Hydrocarbon extraction rates will become asymptotic by the end of one year The criteria for vapor cleanup of 100 ppmv may result in longer operations that may be more cost effective with a tiansition to vapor phase carbon for vapor abatement Subtask 4 3 - Weeks 53-104 $ 61,680 Terra Vac believes that the second year of operation will be reduced to air injection foi enhanced biorernediation, with no further requirement of vapor abatement Monthly sampling of the six onsite monitoring wells will continue as weekly site visits are reduced to monthly