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Mosta Brothers Service Station 20 November 6, 1992 ' TABLE 5 Analytical Results expressed in micrograms per Mer (ppb) Sample N TPPH TRPH Benzene Toluene th 1- Total Total Soluble p o �� Gasoline O&G I I benzene X lenes Lead Lead ' MW-1 60 ND ND ND ND ND 238 ND MW-2 470 ND 7 0* 1 6 ND ND 236 ND MW-3 -550 ND '-19 0* ND ND ND -73 ND TB ND ND ND ND ND FB MW-3A ND ND ND ND ND MRL 10 2000 05 05 05 05 20 05 MCL-P 067 2,000 680 1,750 50 MCL-S 40 30 20 ' ND None Detected above Minimum Reporting Level (MRL) TB Travel Blank FB Field BIank exceeds current MCL MCL-P State of California Primary Maximum Contaminant Levels MCL-S State of California Secondary Maximum Contaminant Levels 5.0 CONCLUSIONS Gasoline hydrocarbons were not detected in the soil sample from the capillary fringe to groundwater in the soil samples collected from the three monitoring wells, nor ' were gasoline hydrocarbons detected below a depth of 30 feet during the soil characterization This indicates that no gasoline hydrocarbons have migrated vertically through the soil beneath a depth of 30 feet at the property Total lead has ' not been detected in soil samples above the native concentrations present within the soil TPPH as gasoline was detected at the minimum reporting level of 10 mg/kg in ' the soil sample from 10 feet below the top of the perched aquifer in the underlying aquitard It is highly probable that this concentration indicates cross contamination ' from the gasoline hydrocarbons within the overlying groundwater zone, and does not indicate that gasoline hydrocarbons are present within the underlying aquitard No volatile aromatics were detected in this sample, nor were gasoline hydrocarbons detected in the two samples from the aquitard in the other two monitoring wells EB-8101-3 9210-EO55 RPT r