The owner of property for which a notice was received under AS 46.03.500(b) shall ensure that the property is vacated and secured against use
(1) within four days after receiving the notice if the owner does not test the property under AS 46.03.520 within four days after receiving the notice; or
(2) within four days after receiving the test results if the owner tests the property within four days after receiving the notice, the test shows the presence of a substance that exceeds the limits set in regulations adopted under AS 46.03.530, and the owner does not begin decontamination procedures under AS 46.03.540 within four days after receiving the test results.