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Mr. Carlos Murillo `' I./ September 17,2002 Page 2 site most likely reflect the soil conditions throughout the site and the local area. The soil type and percolation rate observed were used to select a soil factor to determine the required leach line length according to the San Joaquin County Environmental Health Sewage Standards. The three(3)percolation tests were drilled with a 4-inch auger boring to a depth of three (3) feet(See Plate 1 for location). For each of the three(3)percolation test holes, the bottom 2- inches was filled with pea gravel. A 2-inch open ended and slotted PVC pipe was place on the bottom and backfilled with about 1-foot of pea gravel in the annular space. The hole was saturated 24-hours prior to the percolation test on 9/9/02. On 9/10/02, each percolation test hole was filled with water to 6-inches above the bottom and the water drop was measured each 1/2 hour for a period of 4 hours. The test was observed by Mr. Steven Shih, Inspector SIC PHS- EHD. The following table provides a summary of the percolation tests performed by our office. Percolation Test Summary Standard San Joaquin County Percolation Test Method Utilized (Permit No. SR0028753) Name Test Depth(ft) Date Tested Soil at Percolation Test Depth(USCS) Percolation(Rate) P-1 3 9/10/02 Dark gray silty clay(CL) 125 min/in P-2 3 9/10/02 Dark gray silty clay(CL) 250 min/in P-3 3 9/10/02 Dark gray silty clay(CL) 20.8 min/in The percolation tests were conducted on September 10,2002 in an area desired for the new septic system. After checking with Environmental Health,that area appears to have limited space for a replacement system. Another area on the property with adequate area was selected for the new leach field. In addition to the recent percolation testing, our office conducted a deep percolation test for the existing septic system in November 1999 near the existing septic system seepage pit. The depth of the deep percolation test hole was 21 feet. During a 1 hour percolation test, a percolation rate of 5.4 minutes per inch was achieved. Examination of the soil borings and percolation rates indicate the surface soils are clayey and capable of satisfactory percolation rates. A clayey soil factor of 0.250 best reflects the shallow soil condition throughout the site according to the San Joaquin County Environmental Health Sewage Standards. Permeable deep soils at a depth of 21 feet exist on the site as reflected by the deep percolation test conducted on the site in 1999. e