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ARCADIS Ms. Amaru June 1, 2010 • TPH as gasoline by USEPA Method 8015B (M) • TPH as diesel by USEPA Method 8015B (M) • TPH as motor oil by USEPA Method 8015B (M) • Moisture content by ASTM Method D-2216(so that results can be presented on a dry weight basis) With the exception of one sample, the results for all contingency samples were not detected above laboratory reporting limits or were detected at concentrations below screening levels (Table 1). One sample collected from boring C51-SB13 (from 5.5 to 6 feet bgs) contained a TPH as motor oil concentration of 190 mg/kg. Proposed Additional Soil Removal As described in the Site Sampling and Soil Removal Work Plan, ARCADIS proposes to expand the existing excavation and remove additional impacted soils based on the soil sampling results. The intent of the expanded excavation will be to focus on removing impacted soil in the directions of the borings containing concentrations above ESI-s. Figure 3 presents the proposed excavation areas. Prior to digging, the underground utilities in these areas will be positively identified using hand tools (e.g., shovels) or an air knife. Soil will then be removed if possible using a small backhoe or bobcat; however, the presence of structures, pipelines and/or conduits may limit the ability to remove additional soil. Soil around borings C51-SB2 and C51-SB13 will be excavated vertically to approximately 7 feet bgs (or approximately one foot below the impacted soil). Soil in this area will be excavated horizontally within the limits of the surrounding underground utilities. If the soil cannot be removed safely from this area, the excavation activities will be discontinued. Soil around boring C51-SB4 will be excavated vertically to approximately 10 feet bgs (or approximately two feet below the impacted soil). Soil in this area will be excavated horizontally within the limits of the surrounding borings and underground utilities. Page: 4/8