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-We <br /> June 8, 2006 <br /> NOA Project Number: E06036A <br /> of this report. <br /> )6.2 Number of Percolation Tests <br /> .� Two shallow and two deep percolation tests were conducted on each parcel, for a total of eight <br /> percolation tests on the site. These tests were done in the proposed septic disposal areas for the <br /> future residences. <br /> V 6.3 Boring Preparation and Presaturation <br /> Two shallow and two deep soil borings were advanced on each parcel of the Site with a truck <br /> mounted deep rock augur rig on May 14, 2006. <br /> A 1.5-inch diameter PVC pipe with perforations on the bottom was used to measure the drop of <br /> water 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. "Pea gravel' <br /> was then used to backfill in the annular space. <br /> Presaturation of the percolation test holes occurred approximately 24 hours before the percolation <br /> tests. The depth of water used to pre-soak was 12 inches above the bottom of the borings. <br /> /6.4 Condition of Borings After Presaturation <br /> After the 24-hour soak period, the majority of the presaturated holes were found to be intact, but <br /> several of the holes still contained water.- <br /> v/6.5 Percolation Test Procedure <br /> The percolation tests were conducted for the borings on May 15, 2006 in accordance with the <br /> requirements of the EHD. A percolation test with a duration of four hours was performed for each <br /> hole. The last half an hour of the tests was observed by Ms. Lisa Medina, Senior Registered <br /> Environmental Health Specialist, EHD. <br /> s 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 every 30 minutes for a period of <br /> four hours. <br /> 7 <br />