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Several other contractors who considered bidding the project determined that construction of the gravity line was not feasible, and if attempted could result in property damage to adjacent landowners and impose on vehicular access to public roads for several weeks. The main factor contributing to the hardship condition is the limited space with which to construct the gravity system. The gravity line will have to be constructed witr.in a 16 - foot wide utility easement, five feet away from an existing 6" water main located in the center of the easement. There are several existing structures and landscape features located at the edge of the easement. With an average depth of eight feet and a maximum depth of, twelve feet, the trench will encroach into the structures and the water main resulting in possible undermining of and damage to private and County property. To prevent these problems, staff has explored a less intensive alternate design utilizing a low-pressure force main system. The force main system can be constructed quicker and more economically, due to the relatively shallow ditches and smaller diameter pipe involved in the installation. With a low-pressure force main system, each commercial property that connects will have to construct a private pump station. The proposed design has been reviewed with the Environmental Health Department and they are in concurrence. On September 21, 1993, the -Board of County Commissioners approved the award of the Labor Contract (Bid No. 4007) to Driveways, Inc. (See attached meeting minutes for contract renewal). Due to the lower construction cost and impact of the alternate design on the surrounding area, staff is recommending that the Board of County Commissioners reject the bid proposed by Driveways, Inc. to construct the gravity line and authorize Driveways, Inc. to construct the low-pressure force main through the labor contract. ANALYSIS The proposed force main will serve the same area as the gravity sewer system. The total estimated cost to construct the force main is as follows (see attached cost estimates): Labor Contract $16,367.66 10% Labor Contingency $1,636.77 Material $21,444.44 Engineering, Inspection and Permitting $3,400.00 Total Project Cost $42,848.87 In accordance with the approved developer's agreement, Mr. Phillipson will be required to contribute to the cost according to the estimated proportionate use of the system as follows (see attached cost sharing analysis): Equivalent Building Area (square feet) May 26, 1998 Phase 1 & 2 Liftstation 307,500 Phase 2A Coll. Syst. 81,151 65 Phillipson 11,892