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L <br /> L September 30,2007 <br /> NOA Project Number: E07147A <br /> L Presaturation of the percolation test holes occurred the same day of drilling. The depth of water <br /> /used to pre-soak was 12 inches above the bottom of the borings. <br /> U 6.4 Condition of Borings After Presaturation <br /> After the 24-hour soak period, the presaturated hole was found to be intact and dry on the day of <br /> testing. <br /> 6.5 Percolation Test Procedure <br /> L. Percolation tests were conducted for the borings on the site on September 14,2007 in accordance <br /> with the requirements of the EHD. A percolation test with a duration of four hours was performed <br /> for the hole. The last half an hour was observed by Ms. Lisa Medina,Registered Environmental <br /> ` Health Inspector, EHD. <br /> Measurement 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 /> 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 /> L, bottom level of the percolation test hole. The readings were taken every 30 minutes for a period of <br /> four hours. <br /> L /6.6 Percolation Test Forms and Results <br /> The completed percolation test forms are included in the appendix of this report. <br /> L. <br /> A shallow percolation test is defined by the EHD as being between 36 and 42 inches in depth;a <br /> satisfactory percolation rate for a shallow test is less than or equal to 60 minutes per inch drop. A <br /> L deep percolation test is defined as being between 3.5 and 25 feet in depth;a satisfactory percolation <br /> rate for a deep test is 30 mini/in or less. One 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 4. <br /> i <br /> Table 4. <br /> Summary of Percolation Tests. <br /> Test No., Percolation Percolation Rate Test Comment <br /> Date Tested Test Depth(ft) (min/in) Duration (see notes) <br /> ` Deep 23.97 125 4-hr Failing Percolation Rate <br /> 9-14-07 <br /> r.. Shallow 3.2 8.62 4-hr Satisfactory Percolation Rate <br /> 9-14-07 <br /> Note: A satisfactory percolation rate for a"shallow'test= than or equal to 60 minutes per inch. <br /> A satisfactory percolation rate for a"deep"test is less than or equal to 30 minutes per inch. <br /> b- <br /> 7 <br />