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TABLE 2 <br /> PERCOLATION TEST RESULTS WITH CORRESPONDING SOIL TYPE, <br /> PERCOLATION RATE AND APPLICATION RATE IN GALLONS/FT'/DAY <br /> 36 INCH DEEP PERC TEST BORING 31.3 min/inch / 0.522 gallons/ft'/day <br /> CLAY LOAM <br /> 100 INCH DEEP PERC TEST BORING 125.0 min/inch / 0.100 gallons/ftZ/day <br /> SANDY CLAY LOAM <br /> I <br /> 300 INCH DEEP PERC TEST BORING 41.7 min/inch / 0.400 gallons/ft2/day <br /> SANDY CLAY LOAM <br /> I <br /> GROUNDWATER INFORMATION <br /> NLS§ 2.1, SSS§ 4.1. Groundwater depths and elevations throughout San Joaquin County are <br /> illustrated on maps published by the County Flood Control and Water Conservation District. The <br /> Fall 2016 Lines of Equal Depth Maps and the Lines of Equal Elevation Maps indicate <br /> groundwater depth and directional flow. Depth to groundwater is approximately 90 ft below <br /> grade and the groundwater directional flow appears to be in an east northeasterly direction. <br /> NLS§2.2,3.1, SSS§ 4.2. Surrounding agricultural properties are currently farmed and have been <br /> for decades, and surrounding properties have been on septic systems so the potential for nitrate <br /> contamination of the underlying groundwater can be considered a possibility. However, given the <br /> underlying clay soil lithology and the depth to groundwater,the nitrate potential may be <br /> diminished. <br /> NLS§2.3,SSS§4.3, 4.4, 4.5. The domestic well on the property is defunct and non-operational. <br /> Discussion on the Alkalinity Requirement for Nitrification <br /> The nitrate-nitrogen loading calculations are contingent upon the environmental factors required <br /> for nitrification to occur. These conditions include soil pore-space oxygen content, soil <br /> temperature,pH, electrical conductivity, organic matter, cation exchange capacity, and alkalinity. <br /> Alkalinity in wastewater effluent is derived from well water; in addition to the introduction of <br /> wastes. Nitrification consumes approximately 7.1 Ing of alkalinity for every mg of ammonia- <br /> nitrogen(NH4-N) oxidized. Nitrification of the average Total Nitrogen(TN) concentration of 36 <br /> mg/L,as determined below, would require: 36 mg/L NH4-N x 7.1 mg CaCO3=256 mg/L <br /> alkalinity. The alkalinity in groundwater could not be determined,but is probably between 100- <br /> 150 mg/L. Therefore, soil alkalinity and alkalinity from wastes must provide additional alkalinity <br /> concentration for nitrification to occur. <br /> Page-4 �jj <br /> - <br /> Chesney Consulting <br />