Check those lab reports again. 1% is 1000ppm. 1000ppm is NOT insignificant and is a very high hazard. Now if the lab report is <1 ppm, then it can be described as "trace" amounts.

Sometimes a lab will use a term like <1 ppm to indicate that the amount of a contaminate is less than their detectable limit. In other words, they could not detect the contaminant at his time due to technology limitations, but they cannot say with absolute certainty that it is completely absent.

The lab report should indicate their lowest detectable limit with the test they were using.