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Work Plan for Additional Subsurface Assessment and Feasibility Study—Fortner Unocal Station#0187 September 14,2000 Task 2. C-SpargeTM Equipment Installation The C-Sparge panel will be mounted on two 4"by 4" posts The panel size is approximately 31"by 39" The panel includes an ozone generator, air compressor, and a programmable timer/controller Sparge points are connected to the panel by color coded,3/8" OD LLDPE tubing Each sparge point will have a dedicated line The tubing will be run through 4" or 2" schedule 40 PVC conveyance piping for added protection Power will be supplied by a 120 volt, 16 amp, single phase service Task 3. C-SpargeTM System Operation The system cycles ozone/air infection between the eight sparge points The schedule can be varied to match site specific conditions The schedule will be varied as part of the system evaluation process The projected radius of influence is approximately 20 feet Initially the effectiveness of the system will be monitored by checking for the presence of bubbles in existing nearby monitoring wells Existing monitoring wells will also be sampled monthly for the first six months of operation In addition to the current sampling parameters the dissolved oxygen in the wells will also be measured After the first six months of operation the effectiveness of the system will be evaluated At that time a decision will be made to either discontinue operation, continue operation without modification or continue operation of the system with system expansion or other modifications Task 4. Vapor-Extraction Test(VET) The three vapor-extraction wells (one installed and two proposed) will be utilized to evaluate the feasibility of vapor extraction as a remedial alternative for the unsaturated soil The VET will consist of an internal combustion engine (ICE)to extract and abate hydrocarbon-bearing vapor from the soil VET parameters (differential pressure, vacuum, temp) will be recorded and vapor samples collected and submitted to a state-certified laboratory The samples will be analyzed for TPHg/BTEX/MtBE by EPA Method 8015/8020 modified In addition, vacuum measurements from the other vapor-extactton wells will be monitored to evaluate the effective radius of influence Per San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD) guidelines, the duration of the VET will be a maximum of 5 days At the completion of the VET, GR will prepare a report with the data and an evaluation as to whether vapor extraction is a feasible remedial alternative for the unsaturated soil at this site GR stated in the latest report entitled "Monitoring Well Installation Report", dated August 2, 2000, that an interim remedial work plan would be submitted by September 29, 2000 Since we have now submitted this work plan with feasibility testing,the interim remedial work plan will be deferred to later date PROJECT STAFF Mr Stephen J Carter, a Registered Geologist in the State of California (R G No 5577) and Mr Paul LeCheminant, a Licensed Engineer with the State of California(M25481)will provide technical oversight • and review of the work Mr Greg Gurss, Senior Protect Manager, will supervise implementation of field 240042 08 10