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July 21, 2014 <br /> Two Single-Family residences <br /> L&A Job No. 14-065 <br /> Page 21 <br /> ONSITE STORMWATER DISPOSAL <br /> General <br /> The advance outwash deposit underlying the gently sloped portion of the site is of <br /> moderately high permeabiliry and infiltration into this soil deposii may be utilized for <br /> onsite stormwater disposal. Soil particle size distribution test was conducted on two soil <br /> samples obtained from ihe outwash deposit to determine their infiltration rates. <br /> Particle Size Distribution Tests and Estimated Infiltration Rates <br /> Two soil samples, one from each of Test Pits 2 and 3, were obtained from the advance <br /> outwash deposit and taken to HWA laboratory far Particle Size Distribution tests to <br /> determine their infiltration rates. These soil samples are listed in the table belov�� and their <br /> test reports are presented on Plates A-1 and A-2. <br /> LIST OF SOIL SAMPLES <br /> Sample Test Pit Depth Soil <br /> No_ No. feet Description <br /> 1 2 7.5 — 8.5 Dark olive brown, silty SAND with gravel <br /> 2 3 3.0—4.0 Dark olive bro��n, poorly graded SAND v��ith silt <br /> The percentages of clay, silt and sand/gravel of the soil samples determined from the <br /> particle size distribution tests are summarized on Plate A-2. Based on these percentages <br /> the soil sampies were classified according to the USDA (U.S. Department of Agriculture) <br /> Texture Triangle chart, a copy of which is shown on Plate A-3 in the attached Appendix. <br /> The classifications of soil samples are presented in the table below. <br /> LIU & ASSOCIATES, INC. <br />