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MCL (maximum contaminate limit) allowed by law. The nitrate level was 8.5 which is below the MCL level of 45. VI. SOIL PROFILE AND PERCOLATION TESTS On 6-13-01 shallow 42 inch deep percolation tests were performed by Ronald Weldum. The tests were discontinued after 3.5 hours of a 4 hour test because the percolation rate was less than 1 inch per 60 minutes.See Exhibit "D" for test results. On 9-21-01 Kleinfelder Inc. performed deep percolation tests. 6 inch diameter holes were drilled to a depth of 10 to 18 feet within 10 feet of the shallow test holes. Test holes were drilled to a sandy silt or silty sand layer. The results of the tests indicate that the soil had a percolation rate of 10 to 17 minutes per inch. See Exhibit "E" for test results. VII. CONCLUSION Based on the results of percolation tests,the soil profile, and the past performance of adjacent existing septic systems it is my opinion that the subject property is suited for the use of septic systems with septic pits. According to San Joaquin County Ordinance 549, established in 1949, the maximum depth for septic pits/dry wells was established as 25 feet. Even at the maximum depth the septic pits should be well above the present ground water elevation. Based in this information the new proposed septic systems should not adversely affect the quality of the ground water in the area. VIII. LIMITATIONS The conclusions of this report are based on the information provided regarding the existing and proposed development and on the site conditions as they existed at the time the percolation tests were performed. It was assumed that the percolation test results are representative of the subsurface conditions in the general area. It is in our professional opinion that the findings and statements do not constitute a guarantee or warranty, expressed or implied. Sincerely, Ronald P. Weldum Civil Engineer RCE 16835 .dg��5 Registration Expires 6-30-05 slq OF CP