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Mr. Jeffrey Wong April 28, 2005 Page 3 of 4 petroleum hydrocarbon constituents as follows: 1. Total petroleum hydrocarbons as gasoline(TPHg)and diesel(TPHd)by EPA method 8015B; 2. Benzene,toluene,ethylbenzene,and xylenes(BTEX)by EPA 8021B; 3. Oxygenated gasoline additives and lead scavengers including MTBE, ETBE, DPE, TAME, TBA, EDB, and 1,2-DCA by EPA 8260B. The samples collected from the stockpiled soil were analyzed for TPHg, TPHd, BTEX, oxygenated gasoline additives, and CAM 17 metals as required by the landfill for characterization of the waste. Anaiytical Results No confirmation soil samples collected from the excavation contained detectable concentrations of petroleum hydrocarbon constituents. The composite sample collected from the soil pile contained MTBE at 0.11 ppm and TBA at 0.14 ppm. The excavated soil was transported under manifest to Forward Landfill in Manteca, California for disposal. Analytical results for soil samples are summarized in Table 1. Laboratory data sheets and chain of custody documentation for soil samples collected from the excavation are included in Attachment C. Disposal manifests for the excavated soil are contained in Attachment D. Groundwater Monitoring and Sampling On April 7, 2005 a Ground Zero technician measured the depth to water in site wells, designated MWl and MW2. The wells are located southwest of the former gasoline UST. The measured depth to bottom of the wells was 47.33 feet below the top of the well casing (btoc) in well MW1 and 57.41 feet btoc in well MW2. The approximate locations of the monitoring wells and well construction details are included in Attachment E. The measured depth to groundwater in the wells was 47.26 feet btoc in well MW 1 and 47.28 feet btoc in well MW2. Ground Zero did not sample well MW 1 due to insufficient water in the well. Ground Zero collected samples from well MW2 pursuant to Ground Zero's standard protocol for quarterly groundwater sampling. Field procedures for groundwater sampling and the field purge log are included in Attachment F. Analytical Results The groundwater samples collected from well MW2 contained no detectable concentrations of petroleum hydrocarbon constituents. Analytical results are summarized in Table 1. Laboratory data sheets and chain of custody documentation for the groundwater samples are included in Attachment G. CONCLUSIONS The lateral and vertical extent of soil contamination has been defined and the contaminated soil removed. Approximately 30 cubic yards of soil was removed from the former UST location during excavation. The excavated soil was transported to Forward Landfill for disposal. A groundwater G.�GROUNDZEILODIFire\excsumdce