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Tr - �. ,..:. ue � 4--•,.ra- -,'"'fir. Lam. xskR^°. %h„ .J¢ -+P k7� _��rmrt�y .�.vPy',.w.:' �T' �- 3 !`'� L���� �hag'': '' <br /> V <br /> 4 <br /> Chevron/Sou-L-i Center <br /> November 1989 <br /> 7 <br /> New double-walled storage tanks will be install <br /> Figure 2 shows the anticipated ed on site <br /> location of these tanks. . <br /> installation will be conducted as required by Tank <br /> y regulations. y local building <br /> SOIL EXCAVATION <br /> If, during the removal of the underground tankr and <br /> associated piping, the site supervisor detects evidence of <br /> }' r ; hydrocarbon contamination, a soil excavation <br /> be <br /> illitiated. This excavation will be accom lishedgusing a ac <br /> = with an e:ctT P g a backhoe <br /> ndable shovel which allows for excavation to <br /> of approximately 18-feet belo,,1 surface. a depth <br /> Any area found to contain hydrocarbons will be excavated. <br /> Excavation will continue in a given direction until the a <br /> nt <br /> limits of c,3ntamination are reached, the excavation equipment i. <br /> .incapable of digging further, or additional excavation could <br /> s <br /> Potentially cause the collapse of on-s ,te or off-site structures <br /> h such as the station building or sidewalks and streets. <br /> During excavation, the site supervisor will moni <br /> levels of hydrocarbontor the <br /> s in the encountered soils. Based on these <br /> field observations, soil samples will be collected for field <br /> .:: h0adspace analyses. These analyses will be <br /> Portable y Performed using a <br /> photo-ionization be <br /> PID <br /> attached GTI Standard Operating ( ) , in accordance with the <br /> Procedure (SOP) '.l. Chevron <br /> Proposes to continue excavation until PID readings of field <br /> samples drop to below instrument detection limits unless other <br /> considerations force the excavation to be halted sooner. <br /> VROUNIMATER <br /> TECH1'OLOGS',f�C. <br />