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t 21 July 2015 AGE Project No. 14-3154 Page 4 of 15 REGULATORY SCOPE OF WORK RECOMMENDATIONS At the direction of CalRecycle and the SJCEHD - LEA the following additional investigation requirements have been prepared or are now proposed. The following is a listing of items included within several communications prepared for the project. 1) Historical Aerial Photographs for the site from 1960-1990. AGE has previously obtained and reviewed historical aerial photographs for the southwest area of the site. A description of the aerial photographs, identifying the waste handling area, will be included in a report of findings and are attached for review. 2) Request for information from Pilkington North America or Libby-Owens-Ford for all files/reports/correspondence related to the disposal site. AGE has requested documents from Pilkington North America. However, to date, no information regarding the disposal facility has been provided by PNA. AGE will also request documents from the CalRecyle regulatory data base for the former disposal site. 3) Perform a Geophysical Survey based on the results of reviewing historical aerial photographs and determining the maximum extent of operation (including the Power Plant property). A Ground Penetration Radar Survey (GPR) survey was performed on 30 June 2015; the area which CalRecycle has designated as the PNA "Disposal" site was surveyed and the open space at 17200 North Murphy Parkway and the Murphy Parkway right-of-way was also surveyed using GPR. AGE has provided written request to the adjacent landowners for access to the former co-generation power plant, however no assurances can be made that access for the survey within the facility barriers will be granted. Results of the GPR survey are attached. Overall, soil not disturbed by deep scour or disturbed by tilling was noted to have no waste burial or structures, other than an irrigation pipeline installed throughout the site. Waste glass in soil produces a "washed- out' signal or a signal which does not show structure and the physical properties of glass are not compatible with GPR radar recognition. Therefore, no media other than the glass was noted during the GRP survey. 4) Prepare a scaled topographic map (in AutoCAD or other engineering program) that depicts the disposal area boundary (1 inch = 100 feet). AGE will contract with an engineer to provide a detailed, scaled topographic map of the waste handling area. The map will be included in a report of findings. 5) Conduct a trenching investigation based on the geophysical survey boundary - collect data on horizontal and vertical extent of waste, cover conditions and waste characteristics. AGE has previously excavated 23 shallow trenches within the former waste handling area to evaluate and document soil cover thickness, waste strata and native soil depth. Generally, the soil cover ranged from three (3) to four (4) feet in thickness and was composed of clean, native imported soil. Waste glass cullet and cemented glass were noted above a native silty, sandy soil which was exposed in each trench established. The depth of native soil was Advanced GeoEnvironmental,Inc.