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Table B-Historical Diesel Thickness Measurements and Product Recovery Data (6/18/99 through 11/9/05) Date 'Recovery Depth to Depth to Diesel Cumulative Operations and Maintenance Notes Well Floating Groundwater Thickness Diesel Diesel Removed (gallons) RW-1 - 12.75 - RW-2 Unable[o access.Trailer parked over well. 20.55 Unable to access RW-2 due to Site construction. Modified passive skimmers in RW-4 RW-3 1314ile 16.46 and RW-6. Approximately 1.51 gallons recovered from RW-3 (bailer) and . Unable 2/7/05 approximately 1.65 gallons recovered from RW-4 (bailer and skimmer combined). RW-4 12.71 15.56 2.85 96.27 Passive skimmer in RW-6 was empty.Approximately 30.7 gallons in product recovery RW-5 - 11.98 - barrel. RW-6 13.29 13.30 0.01 2.62 RW-1 * * _ RW-2 Unable to access.Trailer parked over well. 20.55 Onsite to install active skimmer in RW-4. *Diesel thickness estimated from bailer * * * inspection sample.Unable to access RW-2 due to Site construction.Passive skimmer in 2/11/05 RW-3 0.35 16.58 RW-6 was y emP[ Approximately 0.12 and 1.73 gallons of product removed from RW-3 RW-4 * * *1.95 98.00 RW-5 _ PP y g * * (bailer)and RW-4(skimmer and bailer combined),respectively.Approximately 32.5 RW-6 2.62* * gallons in product recovery barrel. RW-1 Unable to access.Duct piled on top,of well. *Thickness estimated with bailer inspection sample.Unable to access RW-1 due to Site RW-2 0.02 20.55 construction.N line severed b Site construction and N tank em RW-3 * * *1.20 17.64 z y z pty(RW-4).Removed 3/4/05 * * approximately 1.06 gallons from RW-3 (skimmer and bailer combined) and <0.01 RW-4 - 98.00 RW-5 * * _ gallons from RW-6 (skimmer). Relocated passive skimmer from RW-6 to RW-2. RW-6 *0.01 2.62 * * Approximately 33.6 gallons of product in recovery barrel. RW-1 _ RW-2 20.62 Repaired damage to lines and replaced spent Nz tank and all hoses to active skimmer in - - - RW-3 _ - _ 17.77 RW-4. Restarted active skimmer and allowed to pump continuously while checking 3/7/05 RW-4 12.30 12.77 0.47 98.65 passive skimmers in RW-2 and RW-3.Removed approximately 0.07 gallons from RW-2 RW-5 _ - _ (skimmer)and approximately 0.13 gallows from RW-3(skimmer).Approximately 34.4 RW-6 2.62 gallons of product in recovery barrel. RW-1 - 12.16 RW2 12.93 13.06 0.13 20.63 A trace of diesel was removed from the bailer inspection sample from RW-1.Removed active skimmer controller for repairs.Pump ran continuously for 65 minutes.Replaced 3//7/05 RW-3 12.77 13.67 0.90 17.90 passive skimmers in RW-2 and RW-3.Removed 0.0 1,0.13,and 0.20 gallons from RW- RW-4 - - - 98.85 2, RW-3, and RW-4, respectively. Measured product recovery tank volume: RW-5 12.27 approximately 34.8 gallons. RW-6 12.58 2.62 RW-I _ RW-2 20.63 3/24/05 RW-3 - 17.90 Repaired timer solenoid and reinstalled active skimmer controller.Approximately 34.8 RW-4 98.85 gallons of product in recovery barrel.No product recovered. RW-5 RW-6 2.62 RW-1 RW-2 20.63 4/1/05 RW-3 - 17.90 Changed out battery for timer on skimmer pump. Timer shut off p properly atter RW-4 13.29 13.31 0.02 98.85 installation of new battery.Took DTP/DTW on RW4 only.No product recovered. RW-5 - _ _ RW-6 2.62 RW-1 Rev-2 20.63 Opened RW-3 and RW-4 to check passive and active skimmer.Replaced battery on RW-3 12.68 14.25 1.57 **19.03 active skimmer.Reset timer and pump cycle.Removed passive skimmer in RW-3 and RW-4 12.25 12.27 0.02 9 9.05 4/I l/OS bailed a total of 1.13 gallons, Approximately 1.13 gallons of recovered diesel was RW-5 _ _ _ placed in the purge water drum.Approximately**35.0 gallons of product in recovery RW-62.62 barrel. RW-I - 1184 - RW-2 12.87 12.97 0.10 20.65 Replaced empty Nz cylinder.Checked passive skimmers in RW-2 and RW-3.Removed 4/15/05 RW-3 12.69 13.29 0.60 19.35 RW-4 12.21 12.22 0.01 99.05 0.02 and 0.32 gallons respectively.The active skimmer was tamed off to allow product RW-5 _ - _ thickness in wells to recover.Approximately 35.3 gallons of product in recovery barrel. RW-6 2.62 RW-1 - 11.99 - Recovered approximately 0.0 15 gallons of product from passive skimmer in RW-2. RW-2 12.96 13.06 0.10 20.67 Recovered approximately 0.30 gallons of product from RW-3 via passive skimmer and 4/18/05 RW-3 12.79 13.28 0.49 19.65 bailer. The active skimmer was disabled due to thin product layer in RW-4 and RW-4 12.27 12.29 0.02 99.05 insufficient fluid colunm in RW-3.Approximately 35.4 gallons of product measured in RW-5 11.98 RW-6 12.51 2.62 recovery barrel. RW-1 - 11.32 - Recovered approximately 0.008 gallons of product from passive skumner in RW-2. RW-2 13.16 13.25 0.09 20.67 Recovered approximately 0.42 gallons of product from RW-3 via passive skimmer and 4/29/05 RW-3 12.99 13.58 0.59 20.07 bailer.A trace amount of product was recovered from RW-6 with an absorbent sock. RW-4 12.46 12.53 0.07 99.05 The active skimmer was disabled due to thin product layer in RW-4 and insufficient RW-5 - 11.89 - fluid column in RW-3. Approximately 35.8 gallons of product measured in recovery RW-6 12.72 2.62 barrel. Table B 111005 Page 9 of 11