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The technologies were sampled at two-week intervals. During each sampling event, technology influent wastewater was sampled at the common dosing channel. Technology effluent was sampled at the distribution box. Influent wastewater and technology effluent were sampled using automated samplers, programmed to obtain fifteen flow -weighted samples composited over a twenty four hour period. Initiation of the individual samples was timed with a delay, to the influent wastewater dosing schedule for each technology. Composite samples were kept refrigerated at 4 degrees centigrade either by ice packed in the sampler or by use of a refrigerated sampler. Upon completion of the sampling schedule samples were processed at the MASSTC. Analysis for pH and specific conductance were conducted at MAASTC during sample processing. Subsamples for BODS and fecal coliform were sent to the Barnstable County Department of Health and the Environment laboratory. Subsamples for nitrogen and phosphorus analysis: ammonium (NH4), nitrate plus nitrite (NO,,), dissolved organic nitrogen, (DON), particulate organic nitrogen (PON), alkalinity, orthophosphate (POA total suspended solids (TSS) and total phosphorus (TP); were sent to the School for Marine Science University of Massachusetts, Dartmouth (SMAST). Electrical usage by each technology was measured by an electric meter and recorded monthly. Mechanical and other non -quantitative performance monitoring Alarms, mechanical failures, unusual sounds, smells were recorded in a log book as they occurred. Restorative measures taken by the technology vendor to address non -normal conditions were also recorded and appear in the Section 6 of this report. Technology operating history The three Waterloo Biofilter® units were started up on June 7, 1999. Units 1 and 2 were operated continuously for the two-year test period with a last sampling date of June 5, 2001. Data was not collected from Unit 3 after November 28,200 1, as Unit 3 was removed from service in December 2000, in order to begin another testing protocol US EPA ETV in February 2001. 4. Testing Objectives The Waterloo Biofilter® was tested to demonstrate nitrogen removal for use in Massachusetts watersheds which are nitrogen sensitive. Technologies must be able to demonstrate reduction of average total nitrogen levels to below 19 mg/l. Waterloo Biofilter® systems also sought to obtain Massachusetts approvals for higher hydraulic loading rates in soil absorption systems (SAS) which are granted to technologies able to achieve average BODS and TSS levels below 30 mg/l. Waterloo Biofilter® also sought to obtain Massachusetts approvals for reduction in the groundwater separation distance for SAS which are also based upon average BODS and TSS levels below 30 mg/l. Performance Results — WaterlooBiofilter® Page 5 of 28