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Design and permitting costs vary with the site conditions. Electric usage Average electric usage by the three units was 2.43 kW per day per unit or about $.27 per day at $.10 per kW; monthly this comes to $7.20 per month, and $86.20 per year. By comparison with other technologies at MASSTC, this electric cost is the lowest cost of the technologies tested at MASSTC (generally $8-$30 /month). Maintenance Massachusetts requires that all alternative technologies have a service contract in force for the life of the installation. Costs for this service vary but are approximately $400 per year. The service includes inspection of pumps, alarms, controls, fan, effluent filter, and septic tank sludge depth. Septic tanks are pumped at a frequency based on usage, but an approximate cost is $60 per annum. Replacement parts Pumps have a one year warranty; replacement cost is about $300. The medium is claimed to last 30 years, but may require cleaning at 10-15 year intervals ($300-$800 cost to add or replace media). Other costs Quarterly effluent quality monitoring is required for some permits at a cost of $300 or more annually, however this cost ends after 18 months of operation for residential installations. 3. ETI Testing Protocols Synopsis The testing duration was for two years. The technology was installed in triplicate, with identical components. The Waterloo Biofilter® received wastewater at the rate of 330 gallons per day, throughout the two-year testing period. The 330 gallon per day volume is the Massachusetts Department of Environmental Protection (MA DEP) minimum design flow for a new residential house of three bedrooms or less. Delivery of the wastewater was apportioned into fifteen equal doses of 22 gallons each, on a schedule which was designed to mimic the pattern of wastewater use in a typical residence (see ETI QAPP and NSFI/AINSI Standard 40). Periodic calibration of dose volumes delivered to each technology ensured equal dosing to each replicate and to different technologies. Effluent from the technology flowed to a distribution box with four outlets. Three of the four outlets directed effluent to a facility sewer, and the fourth conveyed treated effluent to a one-quarter sized soil absorption system (SAS), designed to MA DEP rules. Lysimeters were installed at depths of one, two and five feet beneath the SAS to collect leachate for analysis. A polyethylene liner with sump collected all leachate from the three technology replicates. Performance Results — WaterlooBiofilter® Page 4 of 28