TUOLUMNE COUNTY -- Two people from the Bay Area who were vacationing in Tuolumne County drowned in separate incidents Tuesday.

The first occurred Tuesday morning in Pine Mountain Lake, according to Tuol-umne County sheriff's Sgt. Jeff Wilson. The body of 28-year-old Ronald Temporosa of San Lorenzo was found at the bottom of a 10-foot-deep portion of the lake. He was near a floating swim platform off Dunn Beach.

Temporosa was vacationing in the area with friends and had talked about going for a morning swim. It is not known how he drowned, but detectives believe his death was accidental.

The second drowning happened Tuesday afternoon during a guided rafting trip on the Tuolumne River.

Mariati Tani, 41, of Sausalito was on a rafting tour with her family when their boat hit a set of unexpected Class V rapids, according to Wilson.

He said something happened with a generator at one of the dams upstream that caused an unexpected change in the water level.

As a result, Wilson said, the rafting guides had to alter the trip so that it ended further downstream and they did not know about the Class V rapids. Rapids are ranked on a six-point scale of danger; Class V is the second highest and requires advanced whitewater experience to safely navigate.

The boat became lodged on a rock, and most of the rafters fell into the water.

Tani was pinned under the water for about 10 minutes until being freed by one of the guides,

A California Highway Patrol helicopter arrived and flew Tani's body and her husband to Pine Mountain Lake Airport, where they were met by sheriff's office personnel.

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