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Project No.: D-6289-08 <br />St. Barbara Catholic School <br />Percolation -Infiltration Tests <br />2. The figure below presents typical coefficients of permeability <br />types of classifications. It is provided as a general referena <br />minimum corrected infiltration rate requirement is 0.3 in/hr. <br />CITY OF SANTA ANA <br />Planning and Building Agency <br />may, lS. <br />Approved <br />FOR PERMIT ISSUANCE <br />)r different soil <br />Mast ID: <br />no <br />slriown, the <br />a e: <br />Coefficient of Permeability k (MIS) <br />10° 10-1 10-1 10-1 10-' 10-0 10-1 lo" 10'1 10-9 10-" 10`11 <br />0.3 inches per our <br />Drainage Good Poor Practically impervious <br />Soil Clean gravel Clean sands, clean sand Very fine sands, organic and insane "Impervious" soils, e.g., homogemmus <br />types and grovel mixtvaes silts, ixturea of rand silt End efay,glacial clays blow zone of weathering <br />till, 5 rWried clay d-posits, etc. <br />"Impervious" Is modified by ef%cts of vegetation <br />and weathering <br />Permeability and Drainage Characteristics of Sails from Terzaghi and Peck <br />The preadjusted percolation rate as calculated before must be reduced to account for the <br />discharge of water from both the sides and bottom of the boring (i.e. non -vertical flow) to <br />determine Infiltration Rate (It). <br />The following two methods have been used to calculate Infiltration rates: <br />1. Porchet Method (aka Inverse Borehole Method) <br />Tested Infiltration Rate (It) is calculated, as per Porchet Method, aka Inverse Borehole <br />Method shown on Plate 5 for PC-1 and Plate-6 for PC-2 presented in Appendix D and the <br />results are tabulated as below: <br />5 <br />