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k Mencarini Property Page 8 of 14 <br /> fl Our Project Number: LGS080538 <br /> August 26, 2008 <br /> Table 3 <br /> Summary of Percolation Tests <br /> .. .. . <br /> Test Number, Percolation Test Percolation Comments <br /> Test Date Depth (feet) Rate Test Duration (see notes) <br /> ( -tes inch) <br /> P-1 (shallow) <br /> 3.3 4.90 4-hr Satisfactory <br /> 8-21-08 percolation rate <br /> Note: A satisfactory percolation rate for a"shallow"to s-4ess-fhan or equal to 60 minutes per inch. <br /> A satisfactory percolation rate for a"deep"test is less than or equal to 30 minutes per inch. <br /> 1.6.7 Discussion of Percolation Test Results <br /> The soils within the sewage disposal area of the site have demonstrated a satisfactory <br /> percolation rate in accordance with the requirements of the EHD for the use of a standard <br /> septic system. <br /> 15.8 Discussion of Septic System Sizing <br /> Septic system construction should follow the San Joaquin County On-Site Wastewater Disposal I <br /> Standards where applicable. <br /> NITRATE LOADING STUDY <br /> Because of concern regarding nitrate leaching into groundwater from septic systems, a nitrate <br /> loading analysis was required by the EHD for the proposed development to measure the <br /> potential concentration of percolating effluent and rain fall over the long term. Where <br /> percolating effluent leaches into the ground, groundwater quality may be impacted to some <br /> degree should the effluent reach groundwater. <br /> The method utilized for the nitrate loading analysis is based on a simple mass balance formula, <br /> discussed in a published article by Hantzsche and Finnemore (1992), which provides a <br /> convenient and simplified method to estimate long-term groundwater nitrate impacts on an <br /> area-wide basis. <br /> Hantzsche and Finnemore found that over a long period of time, water quality in the upper <br /> saturated groundwater zone closely approximates the quality of percolating recharge waters. <br /> They believe that their method is a good planning tool and provides useful information to <br /> planners and local officials but with some real limitations. In their article published in <br /> Groundwater, Hantzsche and Finnemore mention that "...the equation ignores dispersion, <br /> lateral flow, and mixing with groundwater flow from up-gradient areas. These processes would <br /> generally contribute to additional reduction of nitrate-nitrogen concentrations in groundwater to <br /> the extent that the nitrate-nitrogen concentration of groundwater flow from up-gradient areas is i <br /> lower." <br /> 902 Industrial Way• Lodi,CA 95240•209.367.370.1 •Fax 209.369.4228 ©2008 Neil 0.Anderson&Associales,Inc <br />