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Table B-Historical Diesel Thickness Measurements and Product Recovery Data (6/18/99 through 11/9/05) Date n Recovery Depth to Depth to Diesel Cumulative Operations and Maintenance Notes Well Floating Groundwater Thickness Diesel Diesel Removed (gallons) RW-2 11.72 11.81 0.09 15.00 Absorbent sock inserted in RW-2.Skimmer pump damaged;regulator damaged but is 5/14/02 repairable. Nitrogen supply line was damaged and leaked N2. 0.5 gallons of product RW-4 11.05 11.06 0.01 13.00 removed from RW4. RW-2 11_80 11_90 0.10 15.00 Pump inserted in RW-2;skimmer set for(3)one-minute cycles/day.Due to assembly 5/17/02 damage,the N2 tank was replaced and the operating pressure gauge repaired.Absorbent RW-4 11.13 11.15 0.02 13.00 sock inserted in RW4. RW-2 12.16 12.17 15.00 N2 tank was empty upon arrival and valve was in closed position. Skimmer pump 5/21/02 removed and absorbent sock inserted into RW-2. Pump, timer,N2 tank and battery RW-4 0.00 11.32 0.00 13.00 brought back to office. 6/17/02 RW-2 12.41 12.44 0.03 15.00 RW-4 0.00 11.65 0.00 13.00 Skimmer pump is not at site. RW-2 12.86 13.15 0.29 15.00 7/25/02 Absorbent socks RW-2 and RW-4 drained and replaced.Skimmer pump was not set up RW4 12.18 12.21 0.03 13.25 due to lack ofsufficient product.0.25 gallons of product removed from RW-4. 8/13/02 RW-2 11.58 11.62 0.04 15.00 A RW-4 10.84 10.86 0.02 13.25 bsorbent socks in place in RW-2 and RW-4. RW-2 13.14 13.50 0.36 15.00 8/14/02 RW-3 12.95 12.97 0.15 Absorbent socks RW-2 and RW-4 removed and strained.Both socks inserted in RW-4. Skimmer pump installed in RW-2;skimmer set for(3)5-minute cycles/day. RW-4 12.37 12.52 0.02 13.25 8/16/02 RW-2 13.12 13.51 0.39 15.00 Skimmer pump left in RW-2;skimmer set for(3)5-minute cycles/day. RW-4 13.25 RW-2 13.25 13.66 0.41 15.00 The N2 supply system had apparently been tampered with; the skimmer pump was 8/22/02 inoperative.System was removed from the site for inspection/repair.Recovery socks RW-4 12.46 12.94 0.48 13.25 placed in both RW-2 and RW-4.21 gallons in product recovery barrel. RW-2 13.42 13.88 0.46 15.50 Product measurements taken with recovery socks in place in RW-2 and RW-4. 9/11/02 RW-3 13.28 13.31 0.03 Approximately 0.5 gallons of product recovered.Approximately 1.5 gallons of product were removed from RW-4 using a disposable two-inch bailer.Both recovery socks were RW-4 12.55 14.00 1.45 14.75 placed in RW-4.Set up without battery.23 gallons in product recovery barrel. 9/13/02 No product measurements taken.Skimmer pump battery replaced and hose repaired.Skimmer pump installed in RW-2;skimmer set for(3)3-miuute cycles/day. RW-2 13.70 13.93 0.23 17.75 Approximately 2.25 gallons of product skimmed from RW-2.Absorbent sock in RW-4 9/16/02 strained and replaced;0.25 gallons of product recovered.Skimmer pump left in RW-2; RW-4 12.78 13.41 0.63 15.00 skimmer set at(3)3-minute cycles/day.25.5 gallons in product recovery barrel. RW-2 13.81 14.14 0.33 19.50 N2 tank empty;detached and replaced with a new tank.Changed recovery socks in RW- fterpumpin -13.81 -13.91 -0.10 4. Skimmer pump removed from RW-2 and recovery socks placed in RW-2. 10/1/02 Approximately 1.75 gallons of product were recovered from RW-2. Skimmer pump RW-3 13.54 13.56 0.02 installed in RW-4,but inoperative.Approximately 0.50 gallons of product strained from RW-4.27.75 gallons in product recovery barrel. R W-4 12.77 14.23 1.46 15.50 RW-2 13.72 13.95 0.23 19.55 Absorbent socks in RW-2 strained and replaced;approximately 0.05 gallons of product 10/4/02 recovered. Skimmer pump installed in RW-4 inoperative; insufficient water level to allow pump to fiunction.Pump requires--0.55 feet of water to function properly;water RW-4 12.90 14.32 1.42 15.50 depth in RW-4 measured at 0.38 feet. 11/7/02 No product measurements taken.Approximately 0.5 gallons of product were removed from RW-4 using a disposable two-inch bailer.Cumulative diesel removed from RW-4 is approximately 16.00 gallons.Absorbent socks in RW-2 strained and replaced.Approximately 28.3 gallons in product recovery barrel. Table B 111005 Page 3 of 11