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CITY OF SANTA ANA <br />Planning and Building Agency <br />Project No.: D-6289-08 <br />St. Barbara Catholic School <br />Percolation -Infiltration Tests <br />• All the field percolation tests are tabulated and are presented in <br />• After the tests were done, holes were backfilled with cuttings. <br />Approved <br />FOR PERMIT ISSUANCE <br />)endix C. <br />Master ID: <br />Date: <br />• The averaged drop of the stabilized rate over the last three consecutive readings is <br />the preadjusted percolation rate at the test location, expressed in inches per hour. <br />Results of the Tests <br />The results obtained from the analyses are as follows: <br />1. Near surface material consisted of alluvium materials, silty sand and sand, <br />medium dense in consistency. <br />2. The invert level of the infiltration basins should be at 4 feet. <br />3. Field Percolation tests show the following results: <br />Results of Field Percolation Tests <br />Location <br />Coefficient of Permeability (k) <br />inch/min <br />inch/hour <br />meter/second <br />PC-1 <br />0.1199 <br />7.19 <br />0.507 x E-04 <br />PC-2 <br />0.2496 <br />14.97 <br />1.056 x E-04 <br />Average <br />0.18475 <br />11.08 <br />0.7815 x E-04 <br />i. Based on the data presented in this report and the testing information accumulated, <br />it is our judgment that the percolation rate is an average of 11.08 inches per hour. <br />It takes about 5.41 minutes to percolate 1 inch. This conclusion regarding <br />percolation rate is based on the results of our field exploration and testing. <br />4 <br />