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September 19, 2006 NOA Project Number: E06113A approximately 24 hours prior to the percolation tests. The percolation tests were conducted for the borings on September 15, 2006 in accordance with the requirements of the EHD. A percolation test with a duration of four hours was performed for each hole. The final half-hour of each four-hour percolation test was observed by Ms. Amanda Boertien, Environmental Health Department (EHD). Measurement of the water level during the percolation test was from a fixed reference point on the PVC casing using an electric well sounder with an depth accuracy of 1/100th foot. All tabulated values on the field data sheet (attachment) are in decimal feet. After water drop was observed, the holes were checked for refill. The refill level was approximately 0.5 ft (6 inches) of water above the w 'I bottom level of the percolation test hole. The readings were taken approximately every 30 minutes for a period of four hours. a A shallow percolation test is defined by the EHD as being between 36 and 42 inches in depth;a satisfactory percolation rate for a shallow test is less than or equal to 60 minutes per inch drop. A deep percolation test is defined as being between 3.5 and 25 feet in depth; a satisfactory percolation rate for a deep test is 30 minutes per inch or less. Either a shallow or a deep percolation test must demonstrate a satisfactory rate within the proposed septic system disposal field to be suitable for a standard septic system. Details of the percolation tests are summarized in the following table. Summary of Percolation Tests. Test No., Percolation Percolation Rate Test Comment i Date Tested Test Depth (ft) (minutes/inch) Duration (see notes) Parcel l shallow 9-15-06 2.77 No movement 4-hr Failing percolation rate Parcel 1 deep 19.44 5.0 4-hr Satisfactory percolation rate 9-15-0b Note: A satisfactory percolation rate for a"shallow"test is less than or equal to 60 minutes per inch A satisfactory percolation rate for a"deep"test is less than or equal to 30 minutes per inch. The deep zone within the sewage disposal areas of the site has demonstrated a satisfactory percolation rate in accordance with the requirements of the EHD for the use of a standard septic system. Septic System Construction should follow the San Joaquin County On-Site Wastewater ' Disposal Standards where applicable. The next step is that this letter should be taken to the EHD to document the percolation test at the site. The EHD will provide you with design information based on the information in this letter and the number of bedrooms of your new home. i 1 rte`