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2.2 Pothole Field Work In an effort to determine if landfill disposal was an acceptable option for the Site, Ground Zero supervised the advancement of potholes within the proposed excavation area around the UST B and Bunker locations. Sample locations and depths for the UST B and Bunker locations are shown in Figure 3 and Figure 4,respectively. 2.21 Pothole Sampling—UST B On December 29, 2010, Thorpe used a backhoe to advance seven potholes stopping at 3-, 6-, and 9- foot depths for sample collection. Mr. Knoll observed the procedure for the first pothole and requested that Ground Zero submit a map of the pothole locations when the work was completed. Mr. Vazquez collected a soil sample from each of the three depths in each of the potholes. An extra soil sample was collected from pothole G at 12 feet bgs for a total of 22 soil samples. Sample G at 12 feet bgs was collected because it was between the former UST B and the Motor/Hydraulic Oil UST locations. Mr. Vazquez used a photo ionization detector (PID) to aid in the selection of pothole locations. Each of the potholes was backfilled using the soil removed during potholing. Each of the soil samples was collected in 6-inch brass sleeves, the ends covered with Teflon® sheets and capped, uniquely Iabeled, placed into an ice chest cooled to approximately 4°C, and transported to Argon under chain of custody protocol for analysis. Argon did a 3:1 composite of soil samples collected in each pothole. The sample from pothole G at 12 feet was not composited. 2.2.2 Pothole Sampling—Bunker On January 24, 2011, Thorpe used a backhoe to advance two potholes stopping at two, five, and nine foot depths for sample collection. Mr. Vazquez collected a soil sample from each of the three depths in each of the potholes. Soils from the pothole work were stockpiled on visquene and covered pending analytical results. Each of the soil samples was collected in 6-inch brass sleeves, the ends covered with Teflon® sheets and capped, uniquely labeled, placed into an ice chest cooled to approximately 4°C, and transported to Argon under chain of custody protocol for analysis. Argon did a 3:1 composite of soil samples collected in each pothole. 2.2.3 Analytical Results—UST B The soil samples collected on December 29, 2010 were submitted for the following analyses: • Total petroleum hydrocarbons as gasoline (TPHg), TPHd, total petroleum hydrocarbons as motor oil (TPHmo), total petroleum hydrocarbons as hydraulic oil (TPHho)by EPA method 8015M; • BTEX by EPA method 8021B; and • TTLC Lead by EPA method 6010 Analytical results are summarized below and in Table 2. The laboratory analytical report is included in Attachments A-2. -3 -