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March 19, 2004 ` NOA Project Number: E0415A Page 9 ` 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 (appendix) 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 bottom level of the percolation test hole. The readings were taken ` approximately every 30-minutes for a period of 4 hours. A shallow percolation test is defined by the EHD as being between 36 and 42 inches in depth. A ion deep percolation test is defined as being between 42 inches and 25 feet in depth. A satisfactory percolation rate for a shallow test is less than or equal to 60 minutes per inch drop. A satisfactory percolation rate for a deep test is less than or equal to 30 minutes per inch drop. r.. Either one shallow or deep test must demonstrate a satisfactory percolation rate within the proposed septic system disposal field. A summary of the percolation tests is presented in Table 5. Table 5. Summary of Percolation Tests. Test No., Percolation Percolation Rate Test Comment Y. Date Tested Test Depth(ft) (minutes/inch) Duration (see notes) P-1 shallow,3-16-04 3.15 41.6 4 hr Satisfactory percolation rate P-1 deep,3-16-04 22.12 13.15 4 hr Satisfactory percolation rate Notes: 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. 6.5 Discussion of Percolation Tests The soils within the sewage disposal area have demonstrated a satisfactory percolation rate in accordance with the requirements of the San Joaquin County EDH. The soils of the site appear to be suitable for a septic system utilizing shallow leach lines and seepage pits. 6.6 Required Size of Septic System ` According to the San Joaquin County Sewage Standards (1996), the estimated size of the septic system is as follows: Base Tank Capacity(BTC): 1,200 gallons. Average Daily Flow (ADF): 130 gallons (discussed in Section 3.6). ,,. Volume(V): 1,200+ 130 gals= 1,330 gals, recommending 2,000 gallon tank.