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L <br /> L February 8,2007 <br /> NOA Project Number: E06161A <br /> L6.5 Percolation Test Procedure <br /> L Percolation tests were conducted on the subject property on December 15 and 18, 2006 in <br /> accordance with the requirements of the EHD. A percolation test with a duration of four hours was <br /> performed for each test hole. The last half hour of the tests performed on December 15,2006 was <br /> L observed by Mr. Michael Escotto,Registered Environmental Health Specialist, EHD. The last half <br /> hour of the tests performed on December 18,2006 was observed by Ms.Lisa Medina, Registered <br /> Environmental Health Specialist,EHD. <br /> LMeasurement of the water level during the percolation test was from a fixed reference point on the <br /> PVC casing using an electric well sounder with an depth accuracy of 1/100th foot. All tabulated <br /> L values on the field data sheet (appendix) are in decimal feet. After water drop was observed, the <br /> holes were checked for refill. The refill level was approximately 0.5 ft (6 inches) of water above the <br /> bottom level of the percolation test hole. The readings were taken every half hour for a period of <br /> Lfour hours. <br /> 6.6 Percolation Test Forms and Results <br /> LThe completed percolation test forms are included in the appendix of this report. <br /> A shallow percolation test is defined by the EHD as being between 36 and 42 inches in depth;a <br /> L satisfactory percolation rate for a shallow test is less than or equal to 60 minutes per inch drop.A <br /> deep percolation testis defined as being between 3.5 and 25 feet in depth;a satisfactory percolation <br /> L rate for a deep test is 30 minutes per inch or less. A percolation test must demonstrate a satisfactory <br /> percolation rate within the proposed septic system disposal field of each parcel to utilize a standard <br /> septic system. Details of the percolation tests are summarized in Table 3. <br /> Because of the shallow groundwater on site,percolation tests were done at shallower depths for <br /> septic design purposes. Septic systems are required to maintain a minimum of five feet separation <br /> from first groundwater. <br /> Table 3. <br /> Summary of Percolation Tests. <br /> Test No., Percolation Depth to First Percolation Test Comment <br /> Date Tested Test Depth Groundwater Rate Duration (see notes) <br /> (k) (k) (minutes/inch) <br /> P-1(shallow) 1.3 1.5 6.25 4-hr. Satisfactory perc rate / <br /> 12-18-06 <br /> P-2(shallow) 1.35 3.0 20.83 4-hr. Satisfactory perc rate <br /> 12-I8-06 <br /> 8 <br /> �v <br />