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OWTS NOTTINGHAM SYSTEM - INCREASED OXYGEN TREATMENT RESULTS The comparison between the initial sampling of the effluent from the Nottingham Onsite Wastewater Treatment System on March 17, 2021 and after increasing the aerobic capacity of the system are found below in Table 5. Initial testing indicated a decrease in dissolved oxygen (DO) concentrations in the effluent, which should have increased after the introduction of oxygen through the air diffusers. However, after the aerators were upgraded and operated approximately 20 hrs per day, the DO increased dramatically, and concentrations of other constituents of concern decreased substantially with the increase in OZ concentration, as noted. These test results were also compared with data obtained from Small and Decentralized Wastewater Management Systems by Crites and Tchobanoglous (Ref. 2), Table 4-16: Typical data on the expected effluent wastewater characteristics from a residential septic tank with and without an effluent filter vault. Available data from the US EPA is also presented. TABLE 5 NOTTINGHAM TREATMENT SYSTEM INITIAL EFFLUENT TESTING AND EFFLUENT ANALYSES AFTER INCREASED OXYGEN CONTENT Initial Analytical Analytical Results of Crites and US EPA: CONSTITUENT Results of OWTS ONVTS Effluent 'Tchobanoglous: OWTS Manual Effluent Sampled on 5- Conducted on With Effluent Filter Ref. 7, Table 3-7 17-2031 11-16-2021 After (W/O Effluent Filter). Increase in Aerobic Ref. 2, Table 4-16 Capacity I otal K.ieldahl Nitrogen 43.6 mg/L 1.99 mg/L 75 mg/L (75 mg/L) 6 - 18 mg/L Ammonia Nitrogen 31.6 mg/L ND 44 mg/L (44 mg/L) 4 - 13 mg/L (N`Ha N) Organic Nitrogen (Calc.) 12.0 mg/L 1.99 mg/L 31 (31 mg/L) 2 - 5 mg/L Nitrate Nitrogen ND 1.01 mg/L <1 mg/L (<1 mg/L) <1 mg/L Total Nitrogen 43.6 mg/L 3.0 mg/L '75 mg/L (75 mg/L) 25 - 75 mg/L Phosphorous 5.93 mg/L NT 16 mg/L (16 mg/L) 6 -12 mg/L Oil & Grease 43 mg/L NT 20 mg/L (30 mg/L) 75 -105 mg/L Dissolved Oxygen 0.26 mg/L 8.0 mg/L N/A N/A (DO) Total Dissolved Solids 380 mg/L NT N/A 500 - 880 mg/L (TDS) Total Suspended Solids 72 mg/L NT 30 mg/L (85 mg/L) 155 - 330 mg/L (TSS) , Biochemical Oxygen 200 mg/L 18 mg/L 140 mg/L (190 mg/L) 155 - 286 mg/L Demand (BODS) Chemical Oxygen 449 mg/L NT 300 mg/L (400 mg/L) 500 - 660 mg/L Demand (COD) pH 7.52 NT N/A N/A Total Alkalinity 231 mg/L CACO, 69.6 mg/L CACO, N/A N/A Total Organic Carbon 101 mg/1. NT N/A N/A ND = Not Detected NT = Not Tested N/A =Data Not Available Chesney Consulting