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Mr.John Johnson October 18,1995 Page 2 Sample I.D. TPH-gas benzene toluene xylenes lead 1 1.2 0.018 0.025 0.077 < 1 2 ND<1.0 ND<0:010 ND<0.010 ND<0.010 < 1 3 ND<1.0 0.030 ND<0.010 ND<0.010 1 4 ND<1.0 ND<0.010 ND<0.010 ND<0.010 3 5 112 0.013 0.417 1.93 1 6 3.6 0.028 0.046 0.147 4 All concentrations are expressed in parts per million or mg/Kg The samples were also tested for ethylene dibromide, diesel, kerosene, motor oil, other petroleum hydrocarbons and C9 to C36 compounds. The samples were non- detect for those compounds. On March 5, 1987, Kleinfelder consultants reported that 3 monitor wells (MW-1 through MW-3) were installed on March 2, 1987, south, north and northwest, respectively, of the former underground storage tank location. The wells were developed and sampled March 3, 1987. Groundwater was encountered at 13 feet below ground surface. All groundwater samples were analyzed for total petroleum hydrocarbons as gasoline (TPH-g) and benzene, toluene, ethyl benzene and xylenes (BTEX). All samples were non detect except for benzene, detected at 3.5 parts per billion (ppb) in MW-1 and 13 ppb in MW-3. On November 13, 1987, Kleinfelder requested to dispose of purge and sample water �. collected from the wells. The purge and sample water collected April 28, 1987 was non detect. On June 21, 1988, Meinfelder report documented that groundwater samples collected May.27, 1988 were non detect. The depth to groundwater was 20 feet below ground surface. In a November 12, 1990 report, Dames and Moore documented that groundwater samples were collected on October 24, 1990. All samples were non detect. Depth to groundwater was 25.3 feet below ground surface. A fourth monitoring well was installed at the site on September 6, 1991, by Parker Environmental Services. Soil samples analyzed from the boring were all non-detect for TPH-g and BTEX. Groundwater samples obtained on September 11, 1991 from all four monitoring wells were also non-detect for TPH-g and BTEX. Depth to groundwater was 28 to 29 feet below ground surface. A pump test was done by Parker Environmental Services at the site October 15-16, 1991, and it showed that all four monitoring wells are in the same aquifer. A groundwater sample was obtained from MW-4 on January 10, 1992. Groundwater depth prior to removal was 24.65 feet, and the well bottom was measured at a depth of 37.77 feet. Approximately ten gallons was removed by bailer and placed in 5- gallon buckets, which were stored on-site in the fenced loading area. After bailing, groundwater depth was 27.75 feet. The sample was non-detect for TPH-g and BTEX. Parker Environmental Services, 190 East 7th Street, Pittsburg, CA 94565-2317 Phone (510) 439-1024 Fax (510) 439-2566