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NLS§ 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