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r 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 2 13.85 14.34 0.49 19.95 Skimmer pump in RW4 set on continuous mode for 24 minutes;pump cycle then reset to(l)5-minute cycle/day.Approximately 1 1.75 gallons of product recovered from RW- 4.Absorbent socks in RW-2 and RW-3 removed and strained;a negligible amount of 7/7/03 RW-3 13.63 15.05 1.42 5.05 product recovered.Approximately 0.25 gallons and 1.25 gallons of free product were bailed from RW-2 and RW-3,respectively,and added to the product recovery barrel. The absorbent socks were replaced in RW-2 and RW-3.Approximately 37 gallons in RW-4 13.05 15.32 2.27 73.45 product recovery barrel. RW-2 14.29 14.87 0.58 19.95 Product recovery barrel measurement indicated approximately 46.75 gallons of product. Full tank removed and replaced with an empty recovery barrel;skimmer pump set to continuous mode.Full product barrel set next to diesel AST basin.Skimmer pump in 8/8/03 RW-3 14.23 14.94 0.71 5.05 RW-4 set on continuous until no product recovered;pump cycle then reset to(1)10- minute cycle/day.Approximately 10.25 gallons of product recovered from RW-4. Absorbent socks in RW-2 and RW-3 removed and strained;a negligible amount of RW-4 13.58 15.61 2.03 83.70 product recovered.The absorbent socks were replaced it RW-2 and RW-3. Approximately 0.5 gallons in product recovery barrel. RW-1 13.88 13.90 0.02 RW-2 14.46 15.14 0.68 19.95 Skimmer pump turned off; left it place on RW-4.Groundwater measurements it the 8/19/03 RW-3 NA 14.39 .6 5.5.05.5 recovery wells indicated that the water level was insufficient to support skimming.The RW-4 NA 13.47 NA product layer in all recovery wells was insufficient for bailing to be effective. The skimmer was deactivated pending further groundwater elevation evaluation. RW-6 14.30 14.51 0.21 RW-1 14.01 14.03 0.02 RW-2 14.54 15.27 0.73 19.95 RW-3 14.51 15.07 0.56 5.05 Skimmer pump deactivated and left in place it RW-4. Groundwater level in wells 8/29/03 RW-4 - insufficient to support skimming operations.Product layer insufficient for bailing to be 83.70 RW-5 - 13.95 - effective.All recovery wells close to dry. RW-6 14.42 1 14.45 0.03 RW-I 14.07 14.08 0.01 RW-2 14.56 15.65 0.09 19.95 Product recovery barrel measurement indicated approximately 3 gallons of product. 9/5/03 RW-3 14.55 15.01 0.46 5.05 Skimmer pump remains deactivated and in place in RW-4.Groundwater level in wells RW 4 13.91 15.56 1.65 83.70 insufficient to support skimming operations.Product layer insufficient for bailing to be RW-5 14.00 - effective.All recovery wells close to dry. RW-6 14.40 14.66 0.26 RW-1 14.04 14.05 0.01 RW-2 14.61 14.65 0.04 19.95 RW-3 14.62 14.85 0.23 5.05 Skimmer pump remains deactivated and in place it RW-4.Groundwater level in wells 9/19/03 RW-4 14.00 15.20 1.20 83.70 insufficient to support skimming operations.Product layer insufficient for bailing to be RW-5 - 14.50 effective. RW-6 1 14.50 14.51 0.01 Skimmer pump deactivated and left it place it RW-4.Due to low groundwater elevations being insufficient to support skimming operations,no monitoring occurred between September 19,2003,and December 8,2003. RW-1 13.41 13.43 0.02 RW-2 14.02 14.78 0.76 20.20 Skimmer pump limed off;left in place on RW-4.Groundwater levels were sufficient to RW-3 14.02 14.44 0.42 5.30 support bailing of free product from the recovery wells. Approx 3 gallons product were 12/8/03 removed from recovery wells RW-2,RW-3,RW-4,and RW-6. This is the first occasion RW-4 13.31 15.52 2.01 85.70 RW-5 - 13.46 - that free product has been removed from recovery well RW-6.Product recovery barrel RW-6 13.71 14.66 0.95 0.50 measurement indicated approximately 7 gallons of product. RW-I - 8.78 - RW-2 13.10 13.20 0.10 20.20 Skimmer pump in RW-4 set on(1)3-minute cycle/day;negligible product recovered. 1/7/04 RW-3 12.67 12.69 0.02 5.30 Absorbent socks in RW-2 and RW-3.Skimmer pump deactivated and left in place in RW4 12.64 13.98 1.34 85.70 RW-4.Groundwater level in wells remains insufficient to support skimming operations. RW-5 11.97 - Approximately 5 gallons in product recovery barrel. RW-6 12.78 13.20 0.42 1 0.50 Skimmer pump in RW4 set on(1)3-minute cycle/day.Pump cycle controller appeared to be functioning properly despite timer malfunction. Product volume 1/15/04 confirmation in recovery tank was conducted using a coliwasa.Discrepancies in product tank volume measurements were determined to be due to tank imbalance;the tank platfomn was consequently leveled.Revised product recovery tank volume was noted at approximately 6.5 gallons. Rev-I - 12.31 - Initial product recovery barrel volume at approximately 8 gallons. Skimmer pump in RW-2 12.88 13.25 0.37 20.20 RW-4 set on(1)3-minute cycle/day,changed to(3)3-minute cycle/day.Skimmer pump 1/29/04 RW-3 12.55 15.12 2.57 8.30 timer repaired.Approximately one gallon of product skimmed from RW-4 during on- RW-4 12.36 13.22 0.86 88.00 site event. Absorbent socks in RW-2 and RW-3 strained and replaced; negligible RW-5 - 12.48 - product recovered. Approximately 3 gallons of product bailed from RW-3. RW-6 12.61 13.03 0.42 0.50 Approximately 11.8 gallons in product recovery barrel. Table B 111005 Page 6 of 11