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TANK 5 <br /> Tank 5 was oriented in a north-south direction and was used for the <br /> storage of new motor oil. Piping was reported to be above ground. <br /> The fill end of the tank was on the south side. An inspection of <br /> the tank did not reveal any evidence of corrosion. <br /> Soil samples were collected from below each end of the tank. The <br /> samples, labeled as T-5 north and T-5 south, were from native soil <br /> at a depth of approximately 12 feet. The soil was the same type of <br /> deposit present below Tank 4 (ie. light brown silty clay) . Samples <br /> were obtained by driving a brass tube into the soil in the backhoe <br /> bucket brought to the surface from the selected depth. <br /> The soil samples from below the tank and from the combined <br /> stockpile of tanks 5 and 6 were analyzed for BTEX and TPH as <br /> diesel. <br /> TANK 6 <br /> Tank 6 was also situated in a north-south orientation and located <br /> in the same excavation as and just west of tank 5. The tank was <br /> used for the storage of new hydraulic fluid. Piping was reported to <br /> be above ground. An inspection of the tank upon removal did not <br /> indicate the presence of any holes, corrosion or other evidence of <br /> leaks. <br /> Soil samples were collected from the native soil at the north and <br /> south end of each tank at a -'depth of approximately 12 feet. The <br /> soil consists of light brown silty clay. They were collected by <br /> driving brass tubes into the' soil in the backhoe bucket brought to <br /> the surface from the selected depth. The samples from below the <br /> tank and the stockpile were analyzed as described above for tank 5. <br /> ANALYTICAL RESULTS <br /> It is my understanding that the certified laboratory were sent <br /> directly to the County Dept. of Environmental Health and a copy was <br /> a" so forwarded to_ the City of Stockton. These res�_lts Jr: <br /> , dicate that <br /> there is no significant contamination in the native soils below the <br /> tanks or in the fill material that was replaced in the tank <br /> excavations. <br /> Should you have any questions or - need additional information, <br /> please call me. <br /> ncely, <br /> �--` RE4 Gf�C <br /> J N. Alt, Certified Engineering Ge Auii <br /> N° 1136 <br /> CERTiF!FDr <br /> ENGINEEF.ING / ! <br /> GEOLOGIST <br /> ATF OF G;.L�F;, <br />