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I <br /> source of this contamination is not known at this time The adjacent site (south of the Cal Tk <br /> site) is a former key-lock gasoline service station The USTs from that site were removed in <br /> September 1998 <br /> 5.2 Recommendations <br />' EI recommends <br />' i Continued removal of floating oil from MW-2 every two to four weeks, depending upon <br /> re-charge rate, until motor oil no longer appears <br />' 2 The next groundwater monitoring should be conducted concurrently with the adjacent <br /> site (former key-lock gasoline service station) This will further provide groundwater <br />' elevation, gradient and direction of flow data for this whole area and help to determine <br />' the source of contamination in MW-4 and define any future required actions <br /> 3 Continue quarterly monitoring of the four groundwater monitoring wells at Cal Tk to <br /> Iaccumulate data as a basis for future actions <br />�1 <br /> r <br /> i <br /> Environeenng,inc Project No 01-003 10 page 6 <br />