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i <br /> March 11, 2005 <br /> NOA Project Number: E04159A._ " <br /> Vwater in the percolation test boring. Approximately 2 inches of"pea gravel" were placed in the <br /> bottom of the open soil boring, then the PVC pipe was installed on top of the gravel. Several feet <br /> of'.'pea gravel" were backfilled in the annular space. <br /> J/Presaturation of the`percolation test'holes occurred on February 10, 2005. The depth of water used <br /> to pre-soak was 12 inches above the bottom of the boring. <br /> / 6.4 Condition of Borings After Presaturation <br /> After the 24-hour soak period, the presaturated holes were found to be intact on February 11, 2005. <br /> - The deep hole was still wet and the shallow hole was dry. <br /> Y 6.5 Percolation Test Procedure <br /> .r Percolation tests were conducted for the borings on February,11., 2005 in accordance with the <br /> rlrequirements of the EHD. A percolation test with a duration of four hours was performed for each <br /> hole. The last half and hour was observed by Ms. Lisa Medina, Senior Registered Environmental <br /> HealthInspector, EHD. <br /> FjMeasurement 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 o£.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 wasapproximately 0.5 ft (6 inches) of water above the <br /> bottom level of the rciation test hole. The readings were taken approximately every 30 minutes <br /> for a periodCorie ho . <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 testis defined by the EHD as being between 36 and 42 inches in depth; a <br /> satisfactory percolation rate for a shallow,test is less tban or equal to 60 minutes per inch drop. A <br /> deep percolation test is defined as being between 3.5 25 feet in depth; a satisfactory percolation <br /> F1rate for a deep test is 30 min/in or less. One percolation test must demonstrate a satisfactory <br /> percolation rate within the proposed septic system disposal field. Details of the percolation tests are <br /> sinnmarized.in Table 5. <br /> a <br /> r <br /> 8 <br /> bf <br />