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' Cieolo cca[Tecluucst�rc Page 9 g George's Service Feasibility Study Project No 425 2 ' April 28,2004 ' two weeks than weekly monitoring thereafter As conditions change with the seasons, monitoring schedules will have to be amended Additional man hours may be required to ' maintain the condition of the sprinkler system as cold weather months may damage plumbing and sprinkler heads ' GTI will need access agreements from neighboring properties to discharge treated water on the property Expensive horizontal drilling would be required to bring water below Highway 33 to the fields west of the George's Service site Issues with Cal Trans such as bonds and access agreements can increase costs Drilling under railroad will likely be a ' mayor obstacle to water discharge designs and increase costs High contaminant concentrations and limitations on treatment flow rates will require many ' carbon reactivation events and backup water storage on-site It is estimated that, initially, up to 42 pounds of carbon would be needed to treat each 1,000 gallons of contaminated water This would require 210 pounds of carbon per day The following estimates are based on similar work at other sites A three bidding process will be used to determine actual costs upon approval of a Corrective Action Plan A number of variables can increase the estimated costs making this an unlikely remedial candidate ' Description Estimated Cost Carbon Vessels (3 2,000-pound units and reactivation one year) $22,500 Construction (Labor, equipment, materials, security) 40,000 Horizontal Drilling across Highway 33 20,000 Additional Water Storage and Pump 2,500 Permitting and Access Agreements 2,500 Additional Man Hours 7,500 Testing & Sampling Under WDR or NPDESpen-nits 12.500 $102,500 ' 4.0 PROPOSED REMEDIAL METHOD ' From the data presented above, we conclude that the in situ remediation approach is the preferred method We made this decision for the following reasons 1 Dual Phase Extraction is not a viable option due to site-specific conditions and access ' issues 2 Excavation is a more expensive approach and due to site-specific conditions can run into complications and cost overruns at groundwater Excavation would require closing ' Durham Ferry Road for three to five days 3 It is possible to reach the desired goal of 90% destruction of the contaminants with the in situ procedure GTI has used this method at a Modesto site and has seen excellent results in a ten-week period Given these conclusions, we recommend that the APT in situ advanced oxidation remediation process be used to mitigate the elevated levels of BTEX constituents and gasoline at this site and provide the protection needed for public health and the environment