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i. a r 1. 3,Q3 D 5,0 PROCEDURE M L4 3 5 The tank is 4 ft. diameter by 6 ft. 6 in. high, and is installed under two concrete floors, as shown in the attached sketch, Figure 4. Three bore holes will be advanced using a Geoprobe drill, one on either side of the tank, and one angled 240 from the vertical and one 180 from the vertical with the drill positioned S ft. 6 in. from the tank centerline. This will result in sample depths of 9 ft below the tank bottom, and 16 ft. 11 in. below the tank bottom, as shown on Figure 4. Bore hole no. 1 on the north side of the tank will be advanced to the saturated zone (approximately 3-5--ft--)-to--secure-a:-sample-of ground water. Soil samples will be taken at the following depths- B1 — 14 ft. 2 in. below the floor (2 ft. below the tank bottom), 24 ft. 2 in below the floor (12 ft. below the tank bottom), 35 ft. to secure the water sample. • B2 — 19 ft. 2 in. below the floor(7 ft. belo v the tank bottom), 29 ft. 2 in. below the floor (17 ft. below the tank bottom). • B3 —21 ft. 4 in. below the floor(9 ft. below the tank bottom), and 29 ft. 2 in, below the floor (16 ft. 11 in. below the tank bottom). Borings will be filled with cement grout following aompletion of sampling from each. Samples will be analyzed for TPH-Diesel (8260), PH-Gasoline (8260);BTEX (8260) and Chlorinated Hydrocarbons (8260). 6.0 REPORT PREPARATION At the conclusion of the work described above, a report, including findings of the investigation, all analytical results, and rec"onini end ations for future work, will be prepared and forwarded to the SJEHD. 3