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No contamination was found in TS-5, which borders the <br /> ' Southern Pacific property boundary. The test holes within the <br /> Tesoro tank farm (TS-2 , TS-6 , and TS-11 ) show contamination by <br /> benzene, toluene, xylene, and ethyl benzene; however , the <br /> concentrations are not indicative of a new source of leakage. <br /> 1 Test hole TS-4, located in the southwest portion of the tank <br /> farm, shows very low-level contamination by ethyl benzene. If <br /> there was a source of leakage in the tank farm, test hole TS-4 <br /> ' likely would show significant contamination because the ground- <br /> water flow is toward that test hole. <br /> �1 No significant contamination was found in test holes TS-1 <br /> ' and TS-3 . These holes are located west and south of the center <br /> of the tank farm diking. The analysis on the water sample <br /> ' collected from TS-7 indicates that the contamination is old <br /> material . <br /> rMonitoring wells M-1 and M-2 showed low-level contamination <br /> ' by benzene, toluene, xylene, and ethyl benzene. These wells are <br /> located at strategic points on the Tesoro site to detect contam- <br /> ination that could impact offsite areas to the north and west <br /> that show significant contamination. If the hydrocarbon leakage <br /> ' was emanating from the Tesoro property, the monitoring wells <br /> would show high levels of contamination. <br /> - 19 - <br />