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r p Fourth Quarter 2005,Quarterly Groundwater Monitoring Report Pilkington North America,Inc.,Lathrop,CA Page 3 of 5 Table 1 -Diesel Thickness Measurements and Product Recovery ffourth Quarter 2005)-Continued Depth Depth to Diesel Cumulative Recovery to Diesel Date Well ID Diesel Groundwater Thickness Removed Operations and Maintenance Notes feet (feet} (feet) (gallons) RW-1 - 14.38 - - RW-2 15.04 15.31 0.27 21.28 Initial product recovery tank volume approximately 4.6 gallons. RW-3 15.05 15.11 .06 22.34 Recovered approximately 1.6 gallons of product from RW-2, RW-3, 10/31/05 RW-4 and RW-6 using bailing recovery method. Reinstalled SoakEZ RW-4 14.26 15.57 0.31 100.91 socks in RW-2 and RW-6.Ending recovery tank volume approximately RW-5 - 14.20 - .2 gallons. RW-6 14.75 15.10 0.35 3.32 RW-1 - 14.34 - - RW-2 14.98 15.34 0.36 21.53 Initial product recovery tank volume approximately 6.2 gallons. RW-3 14.99 15.05 0.06 22.34 Recovered approximately 1.0 gallon of product from RW-2,RW-4 and 11/9/05 W-6 using bailing recovery method. Reinstalled SoakEZ socks in RW-4 14.21 15.58 1.37 101.41 RW-2 and RW-6. Ending recovery tank volume approximately 7.2 RW-5 - 14.16 - - alions. RW-6 1 14.84 15.07 1 0.23 1 3.57 FOURTH QUARTER 2005 GROUNDWATER MONITORING EVENT (NOVEMBER 8 AND 9, 2005) Field Observations On November 8, 2005, a Condor representative measured water levels at the three Site monitoring wells (MW-1, MW-2, and MW-3) and the six Site recovery wells (RW-1 through RW-6). On November 9, 2005, field observations were recorded at the monitoring wells and groundwater samples were collected for laboratory analyses from MW-1 through MW-3 and the two facility sumps (SE sump and SW sump). Field observations included the appearance of samples (color, clarity, and presence of petroleum product sheen or phase in samples) and collection of water quality field parameters. No petroleum hydrocarbon odors, petroleum hydrocarbon sheen or separate phase petroleum were noted in the field inspection samples collected from the monitoring wells(see attached field forms). Groundwater Gradient The average groundwater elevation measured in the three Site monitoring wells on November 8, 2005 decreased by 0.16 feet since the previous monitoring event conducted on August 17, 2005. Groundwater elevation measurements from the current event indicate that the average depth to groundwater was approximately 14.70 feet below the well collar survey points. The estimated groundwater gradient of 0.0027 ft/ft to the east-northeast was calculated using water level data from monitoring wells MW-1, MW-2, and MW-3, and is consistent with historic monitoring events. A copy of the groundwater measurement field form is attached. Laboratory Analytical Results The groundwater samples collected from monitoring wells MW-1 through MW-3, and the SE and SW sumps were analyzed for total petroleum hydrocarbons quantified as diesel (TPH-D), motor oil (TPH- MO), and kerosene (TPH-K) by EPA Method 8015M. TPH-D was detected in the SW sump at 2.44 milligrams per liter (mg/L) and at 0.106 mg/L in MW-2. TPH-D, TPH-MO, and TPH-K were not detected at or above the laboratory reported detection limits in the groundwater samples collected from monitoring wells MW-1, MW-3, or the SE sump during the fourth quarter 2005 monitoring event. Laboratory analytical results for monitoring wells and sumps were consistent with historic groundwater monitoring data (see Table A, attached). The samples were analyzed by Excelchem Environmental Labs 4F% a CONDOR