River Valley Co-op said this week that members have loaned $5.2 million toward its new store in Easthampton. That exceeded the co-op’s goal of raising $5 million. The loans came form 300 members. Total development costs are projected to be about $17 million. The co-op expects more economic development financing from other sources, according to a news release. River Valley Co-op opened its first store at 330 North King St. in Northampton in 2008. It said it expects construction of the Easthampton store to begin this fall and for the store to be open in the fall of 2020. There would be about 100 new employees.