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April 18, 2005 <br /> NOA Project Number:-E05008B <br /> .Measurement of the water level during the percolation test was from a fixed reference point on the <br /> PVC casing using an electric well sounder with an depth accuracy of 1./100th foot. All tabulated <br /> values on the field'data sheet (appendix) are in decimal feet. After water drop was observed, the <br /> - =holes.were checked for refill.---The refilllevel was approximately 0:5 ft (6 inches) of water above the <br /> bottom level of the percolation test hole. The readings were taken approximately every 30 minutes <br /> for a period of four hours. <br /> 6.6 Percolation Test Fortes and Results"-' <br /> The completed percolation test forms are included in the appendix of this report. <br /> A shallow percolation testis defined by the EHD as being between 36 and 42 inches in depth;a <br /> Pi satisfactory percola.tion'rate for a shallow-test.is less than or equal to 60 minutes per inch drop. <br /> Details of the percolation tests are summarized in Table 8. <br /> F� -Table 8. <br /> -- <br /> .Summary of Percolation Tests. <br /> Test No.-, r Percolation Percolation Rate Test Comment <br /> -Date Tested Test Depth(ft) _.(minutes/inch) Duration (see notes) <br /> P-1 shallow,3-3-05 '3.05 10.9 4-hr. Satisfactory percolation rate <br /> (Parcel l) <br /> P-2 shallow,3-3-45 <br /> .3.0 - 35.7 4-hr. Satisfactory percolation rate <br /> (Parcel 2) <br /> P-3 shallow,3-2-05 -3.10 83.33 4-hr. Slow percolation rate,fail <br /> (Parcel 3)- -- <br /> P-4 shallow,3-2-'05 <br /> Fi 113.0 83.33 4 hr. Slow percolation rate,fail <br /> (Parcel 4) <br /> Note: A satisfactory percolation rate for a"shallow'test is less than or equal to 60 minutes per inch. _ <br /> 6.7 Discussion of Percolation,Test Results <br /> The soils within the sewage disposal areas of the proposed Parcels 1 and 2 have demonstrated a <br /> satisfactory percolation rate in accordance with the requirements of the EHD. The soils of these <br /> Iparcels appear to be suitable for a standard septic system. The soils withing the disposal area of the <br /> Iproposed Parcel 3 and14 do riot_show'a satisfactory percolation rate. These soils are found to be <br /> 1 I <br /> suitable for use with an erigirieered septic system. <br /> 6.8 Discussion of Septic System Sizing <br /> Septic system construction should follow the San Joaquin County On-Site Wastewater Disposal <br /> Standards where applicable. <br /> 9 <br />