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IV/14/VV Til/ 11:18 FAA 108 846 06Y1 ALEINklELJEK 1NC 19J0V4 U1KLEI NFEL DER SOIL PROFILE AND PERCOLATION TESTS We have attached to this letter, our report dated September 16, 1999, regarding percolation testing at Ralph's Statuary. The soil conditions encountered in the deeper percolation test(P-2) consisted of alternating layers of dark brown and light brown silty clay to depths of approximately 8 feet. From 8 feet to approximately 9112 feet a brown clayey sand was encountered. The percolation test was performed primarily in this lower, more granular stratum. The County approved percolation field test sheet was included in our original letter to Mr. Vierra. The calculated percolation rate for the last 30 minutes was 30 minutes per inch, We note that the shallow percolation test failed,as expected, at 120 minutes per inch. CONCLUSIONS Basad on the results of our percolation test, soil profile, and past performance of the existing septic systems immediately north of the Ralph's Statuary project, it is our professional opinion that the proposed leach field system can be constructed as planned. Near the location of P-2 a probe was made to the 15 foot depth to evaluate whether more granular soils existed with increased depth. The soils encountered below the 9 A6 foot depth were found to consist of either silty clay or clayey silt; therefore,there may not be a significant benefit in extending the seepage pit much deeper than approximately 10 feet. However,even if the seepage pit was extended to the depth of 25 feet, which is the maximum depth apparently allowed by San Joaquin County, the bottom of the pit will still be well above the groundwater elevation. Based on our evaluation, it is our opinion that the existing and proposed septic system should not adversely effect the quality of groundwater in the area- LIMITATION rea. I ITI 11� AT.ION$ 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 we excavated our test pit and performed the percolation tests. It was assumed that the test boring and percolation tests 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. Respectfully submitted, KLEINF DER,INC. Ron Heinzen, C-E.,G.E. Regional Manager/ Senior Principal Page 3 of 3 20-3233-01,M 12/2019LS82 Copynot 1999 Kleinfddcr,Inc, October 11, 199999