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TABLE 2 <br /> PERCOLATIONTEST RESU TSV R� RRESPONDING ry1 <br /> l <br /> APPL-ICATION'l-RATES IN;GAI:LONS/,.FTS/,DAY <br /> 42 INCH DEEP FERC TEST BORING 250-min/inch I 0.200 gallons/ft'/day <br /> PERCOLATION RATE/APPLICATION RATE <br /> (OFFICIAL PERC TEST) <br /> 128 INCH DEEP(10.7 FT)PERC TEST BORING 16.7 min/inch / 0.700 gallons/ft'/day <br /> PERCOLATION RATE/APPLICATION RATE <br /> (UNOFFICIAL PERC TEST) <br /> 264 INCH DEEP(22.0 FT)PERC TEST BORING 7.4 min/inch / 0.971 gallons/ftz/day <br /> PERCOLATION RATE/APPLICATION RATE <br /> (OFFICIAL PERC TEST) <br /> Application Rate adapted from California State Hater Resources Control Board Guideli»es for the Design of Senuge Systems and is based on the Pert Rate. <br /> D. GROUNDWATER INFORMATION <br /> NLS§ 2.1, SSS§ 4.1. Groundwater depths and elevations throughout San Joaquin County are <br /> 1 illustrated on maps published by the County Flood Control and Water Conservation District. The <br /> �2 l� 1999 Lines of Equal Depth Map indicate the groundwater depth to be approximately 60 feet below '¢l <br /> grade.. The 2003 Lines of Equal Elevation Map illustrates the groundwater directional flow to be in <br /> a southeasterly direction. <br /> �2y� NLS§ 2.2, 3.1, SSS§ 2.1,4.2. 'Since the subject property and surrounding properties were fanned <br /> . fora number of decades, the potential for nitrate contamination to the upper groundwater aquifers-is <br /> significant. However,from extensive studies conducted by EHD, high nitrate:groundwater has.not <br /> been observed in the Morada area. This can be most likely attributed to the high clay contcnt soil in �{ <br /> this area. <br /> NLS§ 2.3, SSS§ 4.3,4.4,4.5. 4.6. . As referenced, there are no on-site wells that could be sampled <br /> for analysis. It is the policy of EHD to not sample surrounding wells for typical projects. L ) <br /> Calculation of Alkalinity Requirement for-Nitrification <br /> The nitrate-nitrogen loading calculations are contingent upon the environmental factors required for <br /> nitrification to occur. These conditions include soil pore-space oxygen content, soil temperature, <br /> pH, electrical conductivity, organic matter, cation exchange capacity, and alkalinity. Alkalinity in <br /> wastewater effluent is derived from the on-site well water that will be provided, in addition to the <br /> introduction of wastes to the effluent. Nitrification consumes approximately 7.1 mg of alkalinity for <br /> every mg of ammonia-nitrogen (NH4-N) oxidized. Nitri.fication.of the average Total Nitrogen_(TN) <br /> concentration of 42 mg/L, as determined on Page 8, would require: 42 mg/L NH4-N x 7.1.mg . <br /> CaCO3 =298 mg/L alkalinity. The alkalinity in the domestic water.supply"is presently unknown; <br /> but probably low and may supply insufficient.alkalinity for.nitrifcation to readily.proceed. <br /> _ - Chesney'Consulting <br />