|
Page 27
<br /> Cost urnmary by Area
<br /> Collection Mains Onsite System Contingency,Engineerign&Admin Total Cost
<br /> Back Road $ 992,238.00 $ 3,504,000.00 S 1,573,683.30 $ 6,069,921.30
<br /> Heritage Park $ 843,369.10 $ 2,136,000.00 S 1,042,779.19 $ 4,022,148.29
<br /> High School $ 1,997,282.80 S 5,846,000.00 S 2,745,848.98 $ 10,591,131.78
<br /> Keeter S 3,451,610.90 $10,440,000.00 S 4,862,063.82 S 18,753,674.72
<br /> New Seabury $ 1,588,139.10 $ 4,424,000.00 S 2,104,248.69 $ 8,116,387.79
<br /> Transfer Station $ 2,302,924.40 $ 6,776,000.00 S 3,177,623.54 $ 12,256,547 94
<br /> Sanduit Pond $ 424,724.00 $ 1,312,000.00 S 607,853.40 $ 2,344,577.40
<br /> Southgate $ 3,299,280.00 $ 8,200,000.00 S 4,024,748.00 $ 15,524,028.00
<br /> Southport $ 204,064.00 S 592,000.00 S 278,622A0 $ 1,074,686.40
<br /> Wapanong Village $ 206,748A0 S 328,000.00 S 187,161.94 $ 721,910.34
<br /> Willowbend $ 190,152.00 S 512,000.00 S 245,753.20 $ 947,905.20
<br /> Strafford Pond $ 103,513.20 S 288,000.00 S 137,029.62 $ 528,542.82
<br /> Cotuit Meadows $ 83,187.20 S 96,000.00 S 62,715.52 $ 241,902.72
<br /> Total $15,687,233.10 $44,456,000.00 $ 21,050,131.59 $81,193,364.69
<br /> An appendix of the detailed cost estimates in included at the end of this proposal.
<br /> Operation & Maintenance Considerations
<br /> The 0&M costs for a STEP system can be broken into two major components. The first component is the on-site
<br /> (i.e. on-lot) system.The on-site system includes the tank, effluent filter, pumps and controls, building sewer and
<br /> service lateral. The second component is the conveyance component; and it is inclusive of the collection mains,
<br /> air release valves, odor control filters and shutoff valves. Manholes and lift stations are not normally required.
<br /> In the context of the overall wastewater collection system cost, the 0&M of STEP collection mains is normally
<br /> insignificant. An 0&M program for STEP collection mains typically only includes inspection and exercising air
<br /> release shutoff valves in accordance with the manufacturer's recommendations, and replacement of media in
<br /> any odor control filters (if they exist). While most STEP systems are constructed with a few cleanouts that
<br /> facilitate the ability to pig or flush the mains, pigging or line flushing is rarely, if ever, necessary. Breaks in or
<br /> leaks from collection mains are rare and require very low cost to repair, compared to conventional sewers.
<br /> 0&M costs for STEP systems are almost entirely attributable to the on-site conveyance pipes, tank contents,
<br /> effluent screen, and pump portion of the system. Accordingly, the decisions made by STEP operators relative to
<br /> on-site materials, installation quality and 0&M protocols can have a profound impact towards the overall cost of
<br /> the STEP System. Understanding the idiosyncrasies of material selection, installation quality and 0&M protocols
<br /> is the key to understanding the characteristics of a properly constructed and maintained STEP system.
<br /> The 0&M of on-site pump systems is best served when the on-site components are managed by the system
<br /> owner.Access to on-site infrastructure that is owned by the management entity is normally facilitated by an
<br /> easement to the system. Alternatively, some STEP operators have successfully utilized a combination of Service
<br /> Tariffs and/or Service Agreements that are intended to grant 0&M access while preserving the rights of both the
<br /> operator and the customer. While private ownership and home owner associations (HOAs) can sometimes
<br /> succeed at providing 0&M for the on-site system, these options have a poor track record owing to their inability
<br /> to legally require needed 0&M. Homeowners are generally unqualified to perform required 0&M tasks. In
<br /> practicality, most homeowners are willing to grant access to a STEP system on their property for 0&M rather
<br /> than face the burden of maintaining wastewater infrastructure themselves.
<br /> All STEP packages should be carefully evaluated to establish the best value for the utility owner. In its simplest
<br /> form, the concept of a STEP system can be achieved by using a standard septic tank and placing a pump on a
<br /> concrete block. Conversely, a STEP system can be a pre-engineered package that integrates the tank, pump,
<br />
|