A recent survey conducted by the Old Colony Planning Council has determined that neither road conditions nor driving patterns along Summer Street contributed to two serious accidents in which one man was killed and another injured, officials said. The study was commissioned by Easton’s Traffic Safety Committee after George Power, 71, and his dog were killed on Labor Day during a walk. Easton police have said 17-year-old driver Colin O’Hearne was speeding when he lost control and struck the pair. Last year, officials said, a driver hit a telephone pole and a tree near the same spot, and witnesses pulled him out of the burning vehicle. The study concluded that Summer Street is a busy roadway, but an average logged speed of 31.5 in the 30 mile-per-hour zone was not a cause for concern.