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rNLS§2.3, SSS§ 4.3, 4.4, 4.5, 4.6. There are no domestic or irrigation wells on the subject <br /> Parcel. Irrigation water is supplied by an irrigation district. <br /> Calculation of Alkalinity Requirement for Nitrification <br /> The nitrate-nitrogen loading to the underlying groundwater is contingent upon the environmental <br /> factors required for nitrification to occur. These conditions include soil pore-space oxygen <br /> content, soil temperature, pH, electrical conductivity, organic matter, cation exchange capacity, <br /> and alkalinity. Alkalinity in wastewater effluent is derived from future on-site well water, in <br /> addition to the introduction of wastes. Nitrification consumes approximately 7.1 mg of alkalinity <br /> for every mg of ammonia-nitrogen(NH4-N) oxidized. Nitrification of the average Total Nitrogen <br /> (TN)concentration of 62 mg/L, as determined on Page 5, would require: 62 mg/L NH4-N x 7.1 <br /> mg CaCO3 =440 mg/L alkalinity. The alkalinity concentration in the underlying groundwater is <br /> unknown, but assuredly below 440 ppm. Therefore,there is an insufficient alkalinity in the <br /> domestic water for complete nitrification to readily proceed without the introduction of wastes <br /> along with the alkalinity in the soil environment. <br /> E. SURFACE WATER INFORMATION <br /> Storm water management will be on-site, flowing into the almond orchard surrounding the Ag <br /> Building project. Percolating rainwater may provide an indeterminable water table dilution effect <br /> to percolating wastewater effluent. <br /> Climatic Data: Rainfall <br /> NLS§3.2. The filter bed for the project has not been designed to take advantage of <br /> evapotranspiration. Consequently, evapotranspiration(Eto) data from the California Irrigation <br /> Management Information System (CIMIS) is not applicable information. Only when plant life, <br /> specifically a grass, is allowed to grow over the filter bed area and is periodically mowed to <br /> alleviate nitrate loading, can CIMIS data be used. Consequently, the only applicable data that <br /> pertains to this project in the nitrate loading equation and calculations below, is rainfall for this <br /> specific Tracy area. <br /> III. NITRATE LOADING STUDY FINDINGS <br /> A. WASTEWATER FLOW VOLUME PROJECTIONS AND CHARACTERISTICS <br /> Wastewater Flow Volume Projections <br /> Typically, loading projections for commercial facilities are based on the maximum anticipated <br /> wastewater flows generated by occupied people that occur daily, weekly, monthly, or for singular <br /> events. <br /> Page -4- <br /> Chesney Consulting <br />