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h. In sandy soils adjust the water depth to eight (8) inches over the soil at the bottom of the test hole. From a fixed reference point, the drop in water level shall be measured in inches to the nearest 1/16 inch at approximmately ten (10) minute intervals. A measurement can also be made by determining the time it takes for the water level to drop one (1) inch from an eight (8) inch reference point. If eight (8) inches of water seeps away in less than ten (10) minutes, a shorter interval between measurements shall be used, but in no case shall the water depth exceed eight (8) inches. The test shall continue until three (3) consecutive percolation rate measurements vary by a range of more than ten (10) percent. i. In other soils, adjust the water depth to eight (8) inches over the soil at the bottom of the test hole. From a fixed reference point, the drop in water level shall be measured in inches to the nearest 1/16 inch at approximately thirty (30) minute intervals, refilling between tests to maintain an eight (8) inch starting head. The test shall continue until three (3) consecutive percolation rate measurements vary by a range of no more than ten (10) percent. The percolation rate can also be made by observing the time it takes the water level to drop one (1) inch from an eight (8) inch reference point if a constant water depth of at least eight (8) inches has been maintained for at least four (4) hours prior to the measurement. j. Divide the time by the drop in water level to obtain the percolation rate in minutes per inch. k. Percolation rates determined for each test hole shall be averaged to determine the final soil treatment system design. 1. For reporting the percolation rate, worksheets showing all calculations and measurements shall be submitted to the council. m. A percolation test shall not be run where frost exists below the depth of the proposed soil treatment system. 7. If after inspection by the plumbing inspector, a lot proposed for an individual sewage disposal system is determined unsuitable for that purpose, said lot(s) shall not be approved for disposal of waste and, if the lot(s) is contained in a plat, said plat shall not be approved. Construction of such a system on said property shall constitute a violation of this chapter. 8. The subdivision shall not be approved until all new lots proposed for an individual sewage disposal system are found suitable for that purpose, as defined by this and the City of Ramsey Code. 9. All soil tests required herein shall be conducted by a registered engineer, whose expense shall be paid by the applicant.