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r72. CALCULATION OF ALKALINITY REQUIREMENT FOR NITRIFICATION The nitrate-nitrogen loading is contingent upon the environmental factors required for nitrification I 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 water supply, and the introduction of wastes to the wastewater. Considering the alkalinity of the top groundwater would be the highest concentration in comparison to the others sources listed, top groundwater from the backhoe test pit for parcel 2 was analyzed for alkalinity. Nitrification consumes approximately 7.1 mg of alkalinity for every milligram of ammonia- nitrogen(NH4-N) oxidized. Assuming a Total Nitrogen(TN) concentration in septic effluent of 88 mg/L and considering that ammonium typically composes 70-90% of the total nitrogen in , septic tank effluent, we have: 88 mg/L x 80%= 70 mg/L NH4-N x 7.1.mg CaCO3 = 500 mg/L alkalinity required. The alkalinity of the top groundwater tested at 393 mg/L. Therefore,the alkalinity required may be marginal to induce nitrification. D. SURFACE WATER INFORMATION A second holding pond is proposed to be constructed this spring, directly to the west of the existing holding pond. This will provide greater flexibility in nutrient water management, solids separation and cropland distribution. To protect the underlying groundwater and prevent irrigation tailwater from potentially entering the Tom Paine Slough after nutrient water distribution to the cropland,two tailwater ponds are to be constructed this spring. The first tailwater pond will be constructed in the northwest corner of the ranch. Tailwater from this pond, which arrives from the northern fields, will be pumped back into the concrete-lined irrigation ditch for re-use. The second tailwater pond will be built next to the open corrals at the north end of actual dairy facility. This pond will accept tailwater from the Beffa properties and be pumped into the original holding pond. III. MASS BALANCE OF NITRATE-NITROGEN LOADING A. MANURE MANAGEMENT PLAN Manure management and handling for the Rocha Dairy is accomplished primarily by two methods: 1.) Cows in the freestall barns predominately defecate and urinate on the concrete flush alleys. Cows in flushed corrals also deposit waste on the concrete flush alleys, but also in the corral areas where the manure must be manually excavated. Flush water carries the liquid and solid wastes to the holding pond where the majority of solid particles fall out of suspension, or float on the surface of the pond. Excavation of manure solids from the pond are then transported to the Manure Storage Pad (MSP) near the south end of the pond for pick-up by Ralph Hayes and Sons Spreading of Tracy, California. 8 Che mery. Consu.Ctirg