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<br />Electricity $15 Monthly $180 <br />Vac-Truck $500 Annual $500 <br />Mise. Repairs (Elee. Mech., ete.) $1,000 Annually $1.000 <br />Pump Replacement $7,500 10 years $750 <br />Complete Rehab $30,000 30 years $1,000 <br />Total $7,230 <br /> <br />Table 4 summarizes the annualized maintenance costs associated with an additional 1700 LF of gravity <br />sewer. <br /> <br />TABLE 5- ESTIMATED ANNUALIZED OPERATION AND MAINTENANCE COSTS FOR 1700 LF OF GRAVITY SEWER <br /> <br />Item Cost Freouencv Annualized Cost <br />Jetting $425 Annually $425 <br />Televisinq $1275 5 years $255 <br />Total $680 <br /> <br />RECOMMENDED SOLUTION <br /> <br />From above, the total cost to construct the gravity sewer in Option 1 is $109,000. The net cost savings in <br />maintenance for Option 1 is $6,550 ($ 7,230-$680). This gives us a payback period of roughly 16.6 years. <br /> <br />From above, the total cost to construct the gravity sewer in Option 2 is $92,000. The net cost savings in <br />maintenance for Option 2 is $ 7, 230. This gives us a payback period of roughly 12.7 years. <br /> <br />The payback period is small enough to justify the improvements. With the additional reliability of the <br />system, which is difficult to quantify, gained through the improvements, we would recommend installing <br />the new gravity sewer to eliminate LS #3. <br /> <br />Option 2 appears to be a better value in terms of how quickly the improvement will pay for itself. It is also <br />unknown at this time, whether the south route can be constructed completely within existing drainage and <br />utility easements. If additional easements were needed, this would also require a reexamination of the <br />numbers. A specific route option can be chosen as part of the final design as more detailed information is <br />gathered to evaluate each option. <br /> <br />City of Centerville <br />2009 Street and Utility Improvement Project <br /> <br />:t; Bonestroo <br /> <br />Project No: 616-07-1580 <br />Page 23 <br />