Two accidents occurred within 300 feet of each other on Highway 174 yesterday but the CHP says the two incidents were not related.  The first crash was at 4:45 p.m. when a 66 year old Colfax man driving a Subaru  turned left into the path of an Audi driven by a  40 year old man on Highway 174 at Maple Way.   Traffic was slowed for a time as the accident was investigated and cleared.  The CHP says  neither driver required medical attention.   The second accident occurred 300 feet north of Maple Way on Highway 174 at 5:45 p.m.   The CHP reports a woman driving a Toyota Tundra stopped for traffic and a man driving a Chevy Sprint   rear ended  the  Toyota  pickup. The driver of the Chevy apparently was not paying attention.  No injries were reported to either driver.