On June 10, 1995, at 1440 Pacific daylight time, a Cessna T210M, N6048N, sustained substantial damage during an attempted landing near Coalinga, California. The aircraft was operated by the pilot and was on a personal cross-country flight. Visual meteorological conditions prevailed and no flight plan was filed for the operation. Neither the certificated private pilot nor her four passengers were injured. The flight originated from the San Jose International Airport, San Jose, California, at 1330 on the day of the accident. The pilot stated that she was executing a landing approach to runway 14 at the Harris Ranch airport. She said she turned base at 900 feet agl and 80 knots. At the Harris Ranch sign she was 600 feet agl and 68 knots. She touched down just before the "Harris Ranch" marking, located midway on the runway, with full flaps and power at idle. She said that at touchdown the aircraft porpoised, rising about 2 feet; porpoised again, rising about 4 feet; and then porpoised again, rising about 6 feet. The pilot added power to correct the porpoise and the aircraft ran off the end of the runway. The aircraft came to rest in a tomato field about 150 yards beyond the runway departure end. During the overrun, the nose gear collapsed in the soft soil and the aircraft ground looped to the right. As the aircraft ground looped the left main landing gear collapsed. Runway 14 is 2,820 feet in length and 30 feet in width. A postaccident inspection of the aircraft revealed propeller damage, substantial damage to the left wingtip and aileron, and a ripple in the baggage compartment door.