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I-ft./ <br /> bw March 28, 2005 <br /> NOA Project Number: E05007B <br /> 6.4 Condition of Borings After Presaturation <br /> After the 24-hour soak period, the presaturated holes were found to be intact and dry on the day of <br /> testing. <br /> 6.5 Percolation Test Procedure <br /> Percolation tests for the Designated Remainder was conducted for the borings on February 28,2005 <br /> in accordance with the requirements of the EHD. A percolation test with a duration of four hours <br /> was performed for the hole. The final half-hour of each four-hour percolation test was observed by <br /> Ms. Lisa Medina, Registered Environmental Health Inspector, EHD. Percolation tests for Parcels 1, <br /> was conducted for the borings on March 10,2005 in accordance with the requirements of the EHD. <br /> A percolation test with a duration of four hours was performed for the hole. The final half-hour of <br /> each four-hour percolation test was observed by Ms. Lisa Medina,Registered Environmental Health <br /> 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 /> bottom level of the percolation test hole. The readings were taken approximately every 30 minutes <br /> for a period of four hours. <br /> bow <br /> 6.6 Percolation Test Forms and Results <br /> The 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 /> `' satisfactory percolation rate for a shallow test is less than or equal to 60 minutes per inch drop. <br /> Details of the percolation tests are summarized in Table 6. <br /> '— Table 6. <br /> Summary of Percolation Tests. <br /> Test No., Percolation Percolation Rate Test Comment <br /> ` Date Tested Test Depth(ft) (minutes/inch) Duration (see notes) <br /> P-1 shallow,3/10/05 3.5 15.63 4-hr. Satisfactory percolation rate <br /> (Parcel 1) <br /> DR-1 shallow,2/28/05 3.00 9.26 4-hr Satisfactory percolation rate <br /> (Designated Remainder <br /> Note: A satisfactory percolation rate for a"shallow"test is less than or equal to 60 minutes per inch. <br /> v <br /> 9 <br />