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ameO mass. A portable helium detector(Marks Product helium detector or equivalent)will be used to detect the presence of helium in the observation wells throughout the constant rate test. The meter will be factory calibrated and field checks will be performed with helium standards to verify the instrument is operating properly. Vapor.samples will be collected in TedlarTM bags r using a vacuum pump or syringe and the helium:detector will be attached directly to the bag t� for measurement. The monitoring frequency for helium is described in Table 2. 5.0 REPORTING Following receipt of analytical data, AMEC will prepare a report to summarize the field activities and present results from the Site investigation and AS pilot test. At a minimum, the investigation and air sparging pilot test report will include: • A written description of field activities; • A scaled map of the Site showing locations of new wells, former UST systems, excavation locations, existing monitoring wells, subsurface utilities, buildings, and streets; • A map showing the estimated extent of petroleum hydrocarbon impacts in the source area; • Soil boring logs, MIP results, and well installation logs; • Pilot scale analytical data presented in tabulated form; • Plots of air injection pressure verses flow`rate from the AS pilot test; • Plots showing the change in water elevation, DO concentration, ORP, helium concentration, and PID readings in the observation wells; • A discussion regarding the effectiveness of AS at the Site and an estimation of AS design parameters (optimal injection pressure and flow rate, ROI, groundwater mounding transition time); and • Recommendations for future work at the Site. 6.0 SCHEDULE AMEC will initiate the scope of work summarized above upon receipt of SJCEHD approval of this work plan. Due to Caltrans funding, the work must be completed on an expedited schedule: • The pre-field activities will be completed by March 26, 2010. AMEC Geomatrix, Inc. P:\Project\14000s\14443_Caltrans\TO 10\11000_PLANSWS WP_March 2010\AS WP.doc 14 i�