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SECOR - Mr. Mike Infurna, July 15, 2005 Page 3 • Installation of Well MW-22. Following the termination of the borehole at approximately 22 feet bgs, the borehole will then be converted to a two- inch diameter groundwater monitoring well (MW-22). The well will be constructed as proposed in the initial and addendum work plans, using Schedule 40 polyvinyl chloride (PVC) with approximately 15 feet of 0.020-inch, slotted screen extending from approximately 7 feet to 22 feet bgs. • Monitoring Well Development/Sampling/Analysis. As previously proposed, the groundwater monitoring well will be developed following installation by rigorously surging the well over the length of the screen interval, and by purging approximately 10 casing volumes of water. Groundwater samples will be collected and submitted to STL for analysis of GRO, BTEX, fuel oxygenates (MtBE, DIPE, TAME, EtBE, TBA, ethanol), and lead scavengers 1,2-DCA and EDB by EPA Method 8260B. • Well Surveying and EDF Upload. Following installation, the newly installed groundwater monitoring well will be surveyed by a licensed surveyor to a local benchmark relative to mean sea level. Survey data including elevation, longitude, and latitude will be uploaded to the State Water Resources Control Board (SWRCB) Geotracker database (www.swrcb.geotracker.ca.gov) in compliance with Assembly Bill 2886 requirements. Soil and Water Disposal. Soil cuttings and purgelrinsate water generated during well installation activities will temporarily be stored in California Department of Transportation (DOT)-approved, 55-gallon, steel drums on-site pending characterization and disposal. The drums containing soil and rinsatelpurge water will be removed by Filter Recycling Services (FRS), and transported to their facility for proper disposal. • Report. Following the completion of well installation activities, SECOR will submit a report documenting the findings of this assessment, and the previous assessment (installation of wells MW-23 and MW-24). The results from both investigation phases will be submitted as part of a site conceptual model (SCM), as requested by SJCEHD in correspondence dated September 28, 2004. The SCM will include a summary of the following: site background, previous investigations and remedial action, results of the installation of wells MW-22 through MW-24, geologic and hydrogeologic setting, distribution of petroleum hydrocarbons and fuel oxygenates in soil and groundwater, conclusions, and recommendations for future work if needed. 11195 Second Addendum to 9-04 WP.doc SECOR International Incorporated