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- <br /> ng <br /> � � � +`..o <br /> '.;f�y�e s-t�. �5k•,t 4 -+4M�1�. _ w 'm,'�;3, .,M .x�v h .a� i.�w>-t., .�+jL 7"� - q: �;ycs r.�i <br /> t, <br /> I <br /> I <br /> kaS <br /> Chevron/South Center 3 <br /> November 1989 <br /> BACKGROUND <br /> In November of 1989, Chevron retained GTI to prepare a work <br /> ' plan for the tank removal and possible additional work at Chevron <br /> Service Station No. 9-0557 (Figure 2, Site Plan) . The site has <br /> been an active service station since 1968 and currently utilizes <br /> four underground-storage tanks; a 10,000-gallon regular unleaded <br /> super unleaded gasoline tank, a <br /> gasoline tank, a 10,000-gallon <br /> 5,0000-gallon regular leaded gasoline tank and a 1,000-gallon <br /> waste oil tank. The tanks were tested in 1983, 1985, 1987, and <br /> ti 1988. None of these tanks have indicated any systen leak. As <br /> part of an on-going program, Chevron plans to refit this station <br /> with new, double-walled storage tanks. The existing tanks and <br /> piping will be removed and new tanks and underground piping will <br /> be installed. <br /> Experience has shown that, though the tank systems do not <br /> show evidence of fuel leaks, some soil may have been impacted by <br /> hydrocarbons. This could have happened during fuel deliveries or <br /> from very small, non-detectable leaks in the tank and line <br /> .�, system. Chevron would like to be ready to remove any impacted <br /> ! soil encountered during the excavation of the underground tanks <br /> and piping. <br /> «� if a large volume of hydrocarbon-contaminated soil is <br /> encountered and/or the vertical limits of such contamination <br /> cannot be established, chevron may wish to install groundwater <br /> monitoring wells to assess whether hydrocarbons have impacted <br /> ? groundwater beneath the site. <br /> 14 GROu.,;JAVATER <br /> TECHNOLOGY.NC. <br />