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July 21, 201 � <br />Two Single-Family residences <br />L&A Job No. 14-065 <br />Page 21 <br />ONSITE STORMWATEI2 DISPOSAI, <br />General <br />The advance outwash deposit underlying the gently sloped partion of the site is of <br />moderately high permeability and infiltration into this soil deposit may be utilized for <br />onsite stormwater disposal. Soil particle size distribution test was conducted on two soil <br />samples obtained from the outwash deposit to determine their infiltration rates. <br />Particle Size Distribution Tests and Estimated Infiltration Rates <br />Two soil sar�ples, one from each of Test Pits Z and 3, were obtained from the advance <br />ot�t��vash �e�c�s�t an�d tak�n t� I-�hTA l�bor�tory for Particle Size Distribution tests to <br />determine their in�ltration �aies. lhese soil sa�npl�s arc;lis�:ed izi the t�ble l��.lotijr and thei�• <br />test r�eports aze 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 Daxk olive brown, silty SAND with gravel <br />2 3 3.0 — 4.0 I�ark olive brown, poorly graded �AND with silt <br />The percentages of clay, silt and sand/gravel of the soil samples determined from the <br />particle size distribution tests are surnanarized on Plate A-2. Based on these percentages <br />the soil samples were classified accarding to the USDA (iJ.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 & ASS�CIATES, INC. <br />