A chemical leak inside a pool maintenance facility at Mill Valley's Tamalpais High School prompted firefighters to issue a precautionary shelter in place warning.

KCBS Radio's Jefffey Schaub reports school was not in session because of the Thanksgiving holiday, 

<p>A chemical leak inside a pool maintenance facility at Mill Valley's Tamalpais High School prompted firefighters to issue a precautionary shelter in place warning.</p>
<p>KCBS Radio's Jefffey Schaub reports school was not in session because of the Thanksgiving holiday,&nbsp;</p>

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