Construction of approximately 6,000 linear feet 132” rib & board Tunnel and 110” secondary hobas pipe. 110” diameter storage and transport tunnel to provide additional storage capacity for the existing Farmington gravity sewer interceptor located on Middlebelt Road between 13 Mile Road and I-696. The tunnel will vary in depth from 40’ to 80’ below the surface of Middlebelt Road and will have a storage volume of 3.7 million gallons. Included in the work, 6 shafts, 4 ea. 14’ diameter dilled; 1 ea. rib and board; 1 ea. secant pile.