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It <br />percolation facility (vertical and horizontal) and, if critical, <br />to a depth two (21) feet below the water table (MSL) at the time <br />of the test. <br />(b) A hole for each test of approximately twelve <br />(12") inches diameter (or as required for a maximum clearance of <br />one-half (1/211) inch between the hole and the test casing) is <br />excavated to the required depth and the casing is lowered into the <br />hole with a minimum of twelve (1211) inches extending above the <br />surface of the grade. <br />(c) The test casing shall consist of a pipe that <br />is at least eight (811) inches in diameter with perforations in <br />approximately the bottom seventy-five (758) percent of the length <br />as measured from the surface. The bottom of the casing shall be <br />pointed. Exfiltration increments shall be measured with a <br />suitable gauging device. <br />(d) Fill the test bore to six (6") inches above <br />the surface of the existing grade and run test no later than two <br />(2) hours after level has exfiltrated to below surface of existing <br />grade. In all•c:ases •test runs are to start only after the first <br />two (2") inches exfiltrated. <br />(e) Run tests for at least thirty (30) minutes and <br />record at least the date, weather, project name, test run by, test <br />number, location on site, sketch of hole and casing, groundwater <br />conditions, incremental drop and time, and subsurface soil <br />information. Information shall be tabulated and attested to by a <br />registered professional engineer, licensed to practice in the <br />State of Florida. The County Division of Public Works must be <br />notified at least twenty-four (24) hours in advance of the tests <br />being conducted and reserves the right to witness the test <br />procedure. Exfiltration rates for designing the site drainage <br />facilities shall be determined by the developer's engineer from <br />these tests. Alternate percolation or permeability tests <br />procedures may be used if approved in writing by the Division of <br />Public Works prior to their use. <br />(4) Hydraulic calculations for sizing channels, <br />culverts, inlets, retention/detention ponds, pond discharge <br />-20- <br />