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Sampling Protocol Prior to startup of the AS/SVE system, influent,_intermediate treatment and effluent vapor samples shall be. collected to ensure proper performance of the system components. The samples shall be collected following the SVE blower and following the catalytic oxidizer as shown on Figure 7. Each sample shall be analyzed for TPHg, BTEX, FOCs, 1,2-DCA and EBD following EPA Test Method TO-15. Upon establishing proper component performance, the system should place into full time operation and monitored per the following schedule. • Daily for the first week of operation • Once per week for the next three weeks • Once per month for the next two months • Once per quarter thereafter • Each individual extraction well should be sampled once per quarter At-each monitoring event, the total system flowrate and pressure will be recorded in addition to each individual AS well's flowrate and pressure. The temperature, flow and vacuum pressure for each individual extraction well will be recorded and each SVE sample port will be field screened with a PID. Should the PID show effluent-concentrations are greater than 10% of the influent concentrations, the AS/SVE system will be shut down pending receipt of analytical results. IMPLEMENTATION SCHEDULE The following is an estimated timeline needed to complete each task: Job Description Estimated Time to complete Installing seven sparge wells Approximately 3 days Installing three soil vapor wells Approximately 1.5 days Installing the conduit piping Approximately 5 days Operating the system Approximately 3 to 5 years, typically followed by an additional year of rebound testing Removal of system Approximately 6 to 8 years assuming typical effectiveness of the system and no additional exploratory directives from the SJCEHD. ESTIMATED PROJECT COSTS Based on 2010 dollars, it is expected that the costs for permitting and installing the seven new AS and three new SVE wells.with geologic oversight and laboratory analyses will be approximately $25,000 to $30,000. Capital costs for acquisition of the AS and SVE systems would be in the $75,000 to $100,000 range, and permitting and installation of the system would range from approximately $3.5,000 to $50,000. Typical monthly operation and maintenance costs including laboratory fees and 1 utilities range from$2,500 to $5,000. i ki I Stockton Maintenance Station,Task Order No.05 Caltrans Contract No.06A1141,EA 10-ON8300 Project No.S9200-06-05A -9- December 28,2010 j