Based on the contract details, the total value of the contract can be estimated by summing up the total costs of all items awarded to each vendor. The Walter R. Earle Corporation was awarded items with total costs of $203,700.00, $2,836,000.00, $50,450.00, $709,000.00, $403,600.00, and $300,000.00, totaling $4,502,750.00. Stavola Asphalt Company, Inc. was awarded items with total costs of $234,000.00, $3,180,000.00, $795,000.00, and $240,000.00, totaling $4,349,000.00. A. E. Stone, Inc. was awarded items with total costs of $224,250.00, $3,250,000.00, $56,825.00, $792,500.00, $462,000.00, and $224,625.00, totaling $5,009,200.00. Brickwall Corporation was awarded items with total costs of $214,500.00, $2,980,000.00, $53,250.00, $740,000.00, $409,000.00, and $300,000.00, totaling $4,396,750.00. The total estimated value of the contract is $18,207,700.00.