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October 23, 2009 Page 7 of 9 <br /> Our Project Number: LGS0090519 <br /> Test No., Percolation Percolation Test Comments <br /> Date Tested Test Rate Depth (feet) (minutes/inch) Duration (see notes) <br /> P-15 (shallow) 3.05 19.20 4-hr Satisfactory <br /> 08-18-09 percolation rate <br /> P-16 (shallow) 3.18 4.00 4-hr Satisfactory <br /> 08-26-09 percolation rate <br /> P-17 (shallow) 3.08 3.80 4-hr Satisfactory <br /> 08-18-09 percolation rate <br /> P-18 (shallow) 3.20 4.10 4-hr Satisfactory <br /> 08-26-09 percolation rate <br /> P-19 (shallow) 3.25 3.30 4-hr Satisfactory <br /> 08-26-09 percolation rate <br /> P-20 (shallow) 3.07 6.80 4-hr Satisfactory <br /> 08-26-09 percolation rate <br /> P-21 (shallow) 3.12 3.50 4-hr Satisfactory <br /> 08-26-09 percolation rate <br /> Note: A satisfactory percolation rate for a"shallow"test is less than 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 /> The soils within the sewage disposal areas 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 /> Septic system construction should follow the San Joaquin County On-Site Wastewater Disposal <br /> Standards where applicable. Due to the depth of groundwater and rapid percolation rate, we <br /> could recommend using a modified filter bed design. For the development of the property, we <br /> would propose some steps to be taken in order to minimize nitrate impacts to the ground <br /> water. The following steps are proposed to reduce the concentrations of nitrates in percolating <br /> septic system efflux <br /> • Utilize standard filter bed system design with the following exceptions. <br /> • Minimum Septic Tank Sizes <br /> 2 bedroom — 1200 <br /> 3 bedroom — 1600 <br /> 4 bedroom — 2000 <br /> 5 bedroom — 2400 <br /> 6 bedroom — 3200 <br /> 7 bedrooms and above will require consultation. <br /> • Apply 4 inches of compost or peat in the bottom of the filter bed. Utilize gravel <br /> drain systems to improve denitrification. <br /> 902 Industrial Way•Lodi,CA 95240-209.367.3701 •Fax 209.369.4228 02009 Neil O.Anderson&Associates.Inc <br />