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' KA No. 072-10043 Page No. 2 1 It should be recognized that water table elevations may fluctuate with time, being dependent upon seasonal precipitation, irrigation, land use, and climatic conditions, as well as other factors. Therefore, ' water level observations at the time of the field investigation may vary from those encountered during the construction phase of the project. Evaluation of such factors is beyond the scope of this report. PERCOLATION TESTING Three percolation tests were performed within the project site to evaluate the soils absorption ' characteristics. The percolation tests were performed inside test holes drilled near the exploratory borings. The percolation tests were performed at depths ranging from 4 to 5 feet below the existing ground surface. The tests were conducted in accordance with the criteria set in the "Manual of Septic ' Tank ?ractice" published by the Department of Health, Education, and Welfare. Results of the tests are as follows: , �:. r - 7 t ;TestIo3ye'Eh�feef �Fi coFa trnn Rafe mtnfin)= s ,moil'i_ e--1 1 5 5 Silty Sand/Sand (SM/SP) ' 2 4 30 Silty Sand(SM) 3 4 30 Silty Sand (SM) The test results indicate that the soils tested have moderate to high absorption characteristics and are ' classified as Type III and Type IV soils based on the California Plumbing Code. The percolation rates given are based on I inch of fall within a 6-inch diameter hole with a 6-inch head of water. Water disposal systems should be designed in accordance with California Plumbing Code requirements. ' LIMPTATIONS Soils Engineering is one of the newest divisions of Civil Engineering. This branch of Civil Engineering is constantly improving as new technologies and understanding of earth sciences advance. Although your site was analyzed using the most appropriate and most current techniques and methods, undoubtedly ' there will be substantial future improvements in this branch of engineering. In addition to advancements in the field of Soils Engineering, physical changes in the site, either due to excavation or fill placement, new agency regulations, or possible changes in the proposed structure after the soils report is completed ' may require the soils report to be professionally reviewed_ In light of this, the Owner should be aware that there is a practical limit to the usefulness of this report without critical review. Although the time limit for this review is strictly arbitrary, it is suggested that 2 years be considered a reasonable time for ' the usefulness of this report. Drainage design and earthwork construction is characterized by the presence of a calculated risk that soil ' and groundwater conditions have been fully revealed by the original investigation. This risk is derived from the practical necessity of basing interpretations and design conclusions on limited sampling of the ' earth. The recommendations made in this report are based on the assumption that soil conditions do not Kraran & Associates, Inc. ' With Offices Serving The Westem United States vrziaoaa s�p.a« TT00/Z000[�] %d3 0£:91 STOZ/83/£0