(CNN) A female engineer at a Bay Area consulting firm says she suffered months of "immediate and significant health problems" after consuming food and drinks she had left at work -- and she believes they were poisoned by a colleague, according to police.

By reviewing surveillance video from inside her office at Berkeley Engineering and Research in Berkeley, California, Rong Yuan said she saw her co-worker, David Xu, spiking her water, according to the court documents.

Yuan has not responded to CNN requests for comment.

Xu, 34, was arrested on March 28 and has been charged with three felonies: premeditated attempted murder and two counts of poisoning with enhancement. The last two counts stem from suffering experienced by Yuan's relatives, who drank from her water bottle after she brought it home from the office.

All three alleged victims' blood samples contained elevated levels of cadmium, according to police.

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