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h <br /> December 16, 1992 ���� <br /> Unocal Service Station No 6981, Stockton, California Working To Restore Nature <br /> i <br /> Addendum to Work Plan No 38032-7 (June 30, 1992) Encroachment permits and <br /> revocable permits were obtained from the City of Stockton to drill in the City right-of-wav <br /> Our field methods are described in Appendix A <br /> i <br /> Under round Storage Tank Removal <br /> n ay _ $,RE9NA co&ected trine soil samples from 4-foat deep test pits located+ 4e-a-?�h' <br /> aside-6f`the two cd'ispi✓riserldands`.and one located perpendicular to and at the southern end <br /> of the dispenser islands (Applied GeoSystems, July 8, 1988) is w�rkQndurd rzn <br /> — <br /> s nnse is,hydrocarham encountered during installation of a gasoline-blending System at 7 <br /> t servece�s�a�'ion <br /> In June 1988, RESNA conducted an investigation during removal of three 12,000-gallon <br /> . underground storage tanks at the site (Applied GeoSystems, July 8, 1988) Two tanks <br /> formerly stored unleaded gasoline, and one tank stored super unleaded gasoline The tanks <br /> were replaced with two new gasoline tanks, which are presently at the site Soil samples <br /> collected from the test pits and beneath the tanks contained gasoline hydrocarbons, <br /> therefore, additional soil was excavated in the area where hydrocarbons were detected <br /> Additional soil samples were collected at the base of the final tank pit excavation (Plate 3), <br /> which was approximately 22 feet below surface These samples also contained residual <br /> gasoline hydrocarbons These results are presented in the Residual Hydrocarbons in Tank <br /> Pit Area section of this report <br /> Approximately 1,600 cubic yards of soil containing hydrocarbons was excavated and aerated <br /> onsite Following aeration, the soil was disposed of at Forward Landfill in Stockton, <br /> California <br /> 1 <br /> 38032-10 4 <br />