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Mr. Snyder <br /> April 23 , 1990 <br /> Page 2 <br /> collected were submitted to you on April 16, 1990. Samples were <br /> collected in accordance with the sampling protocols listed in the <br /> November, 1989 Work Plan. <br /> Based on the analytical results of the soil samples collected, <br /> Chevron would like to dig additional soil from four places on the <br /> site. The attached figure shows the approximate locations of the <br /> proposed excavations as well as the anticipated area of each <br /> excavation. The actual size of each excavation will be to some <br /> extent determined by field evidence. In each place, soil will be <br /> dug out to a depth of approximately five-feet below the current <br /> excavation depth unless groundwater is encountered. Soils will <br /> not be dug out below the water table to prevent the possibility <br /> of sidewall collapse undermining the excavation pit. <br /> Once the limits of the excavation have been reached, soil samples <br /> will be collected from the base of each pit for laboratory <br /> analysis. It is assumed a representative of the San Joaquin <br /> County Health Department will be on site to help select the <br /> number and locations of samples. The approximate locations for <br /> these samples are shown on the attached figure.? Soil samples <br /> from the fuel storage-tank pit and the former piping trench will <br /> be analyzed for total petroleum hydrocarbons (TPH) -as-gasoline <br /> and for benzene, toluene, ethylbenzene and xylenes (BTEX) by U. S. <br /> Environmental Protection Agency (EPA) modified Methods 5030/ <br /> 8020/8015. Samples from the former waste-oil tank pit will also <br /> be analyzed for total lead, rather than BTEX and TPH-as-gasoline. <br /> These analyses are the only ones planned since analytical results <br /> for samples from the prior excavation showed that only these <br /> contaminants were present in concentrations above appropriate <br /> action levels. If water is encountered in the fuel-tank pit, a <br /> water sample will be collected and also analyzed for TPH-as- ? <br /> gasoline and BTEX by EPA modified Methods 5030/-8©2707'ZT 2.51: (HOZ <br /> GROUNDWATER <br /> :I 7-11. TECHNOLOGY,INC. <br />