RedactedNarrative: On 08/08/2015 at approximately 1033 hours, I responded to Castle Creek Boat Ramp at Lake Pleasant in reference to a boat fire with injuries.  Deputy responded in Maricopa County Patrol Boat LP #78 to assist with keeping boats away from the burning boat.
  
  I arrived at approximately 1038 hours and saw a large plume of black smoke approximately 100 yards east of the boat ramp.  As I approached the boat ramp, I saw Peoria Fire unit #198 and Rescue #199 on scene treating the burn victims.
  
  While I was getting information from the boat owner, Scorpion Bay Marina Fire Boat arrived and extinguished the fire.  While extinguishing the fire, the remainder of the hull of the boat sank.
  
  Owner told me he had just launched the boat and started heading out of the no wake zone, as he passed the no wake buoy he began to bring the boat up on plane as he increased his speed an explosion occurred followed by fire.  He stopped the boat and got life preservers for the occupants.  Owner told me he got his great grandkids, wife, granddaughter and himself off the boat and into the water.
  
  Owner told me they swam to a safe distance from the boat.  While they were in the water a pontoon boat stopped to assist with getting the occupants of the burning boat out of the water.  Good sam took them to the Castle Creek Boat Dock where Peoria Fire Department was standing by to begin treatment of the injured.  Fire personnel started treating the two injured for burns.
  
  Owner said his wife and granddaughter were burned on the back of their legs, back, arm and hand.  Peoria Fire told me they were going to fly wife by helicopter to Maricopa County Medical Center Burn Unit.  granddaughter was transported by ground to Maricopa County Medical Center Burn Unit for her injuries.
  
  At approximately 1555 hours, I contacted Owner to find out how victims were doing.  Owner told me his wife was admitted for overnight observation and his granddaughter was released.
  
  None of the injuries were life threatening.  Owner told me he does not have insurance on the boat.
   