VANCOUVER - Beleaguered residents of the Slocan Valley in southeastern B.C., have a few more worries as their region recovers from the spill of 35,000 litres of jet fuel.

The company overseeing the clean up is warning about unauthorized offers to check air and water quality on properties around Lemon Creek.

Executive Flight Centre says Interior Health is responding to individual request for air and water quality checks, but is not going door-to-door, so anyone offering such assessments is not part of the official clean up and should be asked for identification.

As well, RCMP are investigating a second night of vandalism of a tank holding clean water in Crescent Valley, about 23 kilometres north of Castlegar.

The tank is one of several at four locations along Lemon Creek, the Slocan and Kootenay rivers, and police are searching for vandals who twice knocked it over, although Executive Flight Centre says the damaged tank has now been replaced and is again dispensing water in Crescent Valley.

Thousands of residents from Lemon Creek south to the Brilliant Dam have been told not to use creek or river water for any purpose after jet fuel gushed into the waterways on July 26 when a tanker truck crashed into the creek.