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March 18, 2004 NOA Project Number: LE03-467 Page 3 performed on March 17, 2004 in accordance with the requirements of San Joaquin County Environmental Health Division. All the percolation tests were observed by Michael Escotto, Registered Environmental Health Inspector, of that office. A one-hour percolation test for P-4 was performed because the water fell 6 inches within one-half hour making it a candidate for this test. 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 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 of water is approximately 6 inches above the bottom level of the percolation test hole. The readings were taken every 10-minutes for the 1 hour duration of the test and every 30-minutes for the 4 hour test. A satisfactory percolation rate for a shallow(3-3.5 foot deep)test is 60 min/in or less. A satisfactory percolation rate for the deep test is 30 min/in or less. A summary of the percolation tests are presented next. Summary of Percolation Tests. Test No., Percolation Test Percolation Rate Test Comment Date Tested Depth(ft) (minutes/inch) Duration P-1 shallow,3-16-04 3.20 No movement 4 hr P-2 deep, 3-16-04 20.83 83 4 hr Hole silted during winter flooding of area. A broken water pipe was repaired P-3 shallow,3-16-04 13.05 No movement 4 hr P-4 deep,3-17-04 22.1 <1.7 1 hr Redrilled deep test, satisfactory perc.rate observed Discussion of Percolation Tests As a result of the percolation testing, P-4 demonstrated a satisfactory rate in accordance with the requirements of the San Joaquin County EDH. The soils appears to be suitable for a standard type septic system for use with the proposed steel building. The layout and sizing of the septic system is shown by the Mike Smith Engineering, Inc., Lodi, the project Engineer.