Laserfiche WebLink
N <br /> u <br /> ATC Associates Inc. <br /> 1 117 Lone Palin Avenue, Suite 201 <br /> Modesto, California 95351 <br /> (An <br /> 209-579-2221 <br /> ASSOCIATES I N C . Fax: 209-579-2225 <br /> 9.2.8 System Operation <br /> Based on results of the October 2008 vapor extraction tests and current site conditions, ATC <br /> anticipates the system will operate for a period of 18 to 24 months to achieve the PRG soil <br /> cleanup objectives. <br /> 9.2.9 System Performance Evaluation and Reporting <br /> Vapor extraction performance will be evaluated to determine the systcm effectiveness. Vacuum <br /> response and nu*mRae PID levels from individual wells and system influent and effluent will be <br /> used to evaluate the cycling rotation of the extraction wells for optimal system performance. <br /> Routine system operation and maintenance data and system performance results will be <br /> documented in quarterly reports. At a mininnnun, each report will include the following; hours of <br /> operation; system influent and effluent field monitoring readings ; laboratory results of influent and <br /> effluent air samples; total and individual vapor extraction well flow rates; induced vacuum <br /> responses recorded in observation wells; hydrocarbon mass recovery; system destruction efficiency; <br /> and radius of influence information. Recommendations will be provided to optimize system <br /> performance and enhance remediation of impacted soil and groundwater, if warranted. <br /> 10.0 GROUNDWATER MONITORING <br /> Groundwater monitoring and sample collection from the monitoring wells associated with the <br /> site will be conducted in accordance with the current schedule to evaluate the water quality. <br /> Groundwater samples will be submitted under chain-of-custody procedures to a State-certified <br /> laboratory and analyzed for ORO utilizing EPA Method 801513, and BTEX, M"CBE, ethyl tertiary <br /> butyl ether (ETBE) di-isopropyl ether (DIPE), tertiary amyl ether (TAME), tertiary butyl ether <br /> (TBA), 1 ,2-DCA, and 1 ,2-dibromoethane (EDB) utilizing EPA Method 8260B. Depth to <br /> groundwater measurements will also be performed . Periodic reports will be prepared to <br /> document the results of each event. <br /> 11 .0 VERIFICATION MONITORING <br /> Discrete soil samples may be collected in the future using direct-push technology to evaluate those <br /> areas with reported historic elevated absorbed phase corltanninatnt concentrations. Analytical results <br /> can be used in an attempt to approximate a soil mass flux. <br /> 12.0 CLOSURE GOALS <br /> 12.1 Remediation Contingency Plan <br /> The remediation system effectiveness will be evaluated during each site visit and reported on a <br /> quarterly basis, Based on the results of groundwater monitoring and remediation system <br /> performance, ATC may propose additional assessment and remedial activities, as appropriate. <br /> SVE System Design Plan ATC Associates Inc. <br /> Stockton City Taxi <br /> Page 12 <br />