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rrNL4�2.2�i1,SSS§ 4.2 As referenced, water table samples were retrieved from the three b7chlornideat o ter. Several constituents were tested,as illustrated in Table 3. The test results alsncentrations of sodium and particularly chloride, as noted below. These two constituents ascondary Drinking Water Standards and are non-enforceable guidelines regulating contamyuse aesthetic effects. Sodium has no standard,but is generally recognized to be the same 250 ppm. It appears there is a high concentration of these two constituents in the southeast area of the property that is mi In to the northwest. Additionally,the Total Dissolved Solids(TDS)also has a secondary standard 07 ppm. It is noted to be high in all of the water samples Test results reveal nitrate concentrations over the Maximum Contaminant Level (MCL)of 45 in for the boring in the southeast comer of the property, and under the existing leachfield. The wate tab under the future filter bed has a nitrate concentration of 42 ppm. NLS§(2SSS§'r4.3,'4.4,44444444 There ar two d m wells on the property as noted on a Site a . Test results\\ the nitrate concentration in th sled"north" on-site well is above the median2.5 NO3, at 35 ppm(as nitrate). It is my understanding that the well to the south is operational,but is currently being used as standbv fob suppressl . The sample was taken from a nearby rase bb from the north well and delivered to A&L Western Agricultural Labs under the attache rain of Custody. TABLE 3 UNDERLYING GROUNDWATER ANALYSIS WATER TABLE UNDER WATER TABLE UNDER WATER TABLE UNDER ONSITE DOMESTIC WELL PROPOSED PRESSURIZED EXISTING GRAVITY "RESERVE AREA" (SOUTH WELL) FILTER BED LEACHFIELD LEACHFIELD (FLF WATER TABLE) (ELF WATER TABLE) (RLF WATER TABLE) ANALYTE LEVEL ANALYTE LEVEL ANALYTE LEVEL ANALYTE LEVEL FOUND FOUND FOUND FOUND Nitrate 42 ppm Nitrate 64 ppm Nitrate 64 ppm Nitrate 35 ppm Total Dissolved 1150 ppm Total Dissolved 1680 ppm Total Dissolved 2190 ppm Total Dissolved 810 ppm Solids Solids Solids Solids PH 7.4 pH 7.2 pH 7.2 pH 7.8 Chloride 238 ppm Chloridc 319 ppm Chloride 456 ppm Chloride 140 ppm Sodium 236 ppm Sodium 313 ppm Sodium 343 ppm Sodium 103 ppm Total Alkalinity 359 ppm Total Alkalinity 414 ppm Total Alkalinity 417 ppm Total Alkalinity 164 ppm Static —11 It b8 s Static -11 f3 bgs Static _l 1 H Static Could Not Groundwater Groundwater Groundwater bgs Groundwater Be Level Level Level Level Measured Calculation of Alkalinity Requirement for Nitrification The nitrate-nitrogen loading calculations on Page 14 are contingent upon the environmental factors required for nitrification to occur. These conditions include soil pore-space oxygen content, soil temperature,pH, electrical conductivity, organic matter,cation exchange capacity, and alkalinity. Alkalinity in wastewater effluent is derived from the domestic well water supply in addition to the introduction of wastes. Nitrification consumes approximately 7.1 mg of alkalinity for every mg of ammonia-nitrogen(NH;N)oxidized. Nitrification of the average Total Nitrogen(TN)concentration of 68 mg/L, as determined on Page 14 would require: 68 mg/L NH4-N x 7.1 mg CaCO3=618 mg/L alkalinity. Therefore, as noted in Table 3,alkalinity in the domestic water supply will be theoretically and nitrification may be inhibited. 7 �jj Chesney Consulting