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North Rond Road Subdivision Page 6 of 9 <br /> Our Project Number: LGS080510 <br /> April 30, 2008 <br /> 6.2 Number of Percolation Tests <br /> One (1) shallow percolation test was conducted on each parcel for a total of seven (7) <br /> percolation tests conducted on the property. <br /> 6.3 Boring Preparation and Presaturation <br /> Seven (7) soil borings were advanced on property with a hand auger on April 28, 2008. <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, and then the PVC pipe was installed on top of the gravel. "Pea <br /> gravel" was then used to backfill the annular space. <br /> Presaturation of the percolation test holes occurred approximately 24 hours prior to the day of <br /> testing. The depth of water used 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 and dry on the <br /> day of testing. <br /> 6.5 Percolation Test Procedure <br /> Percolation tests were conducted for the borings on April 29 and 30, 2008 in accordance with <br /> the requirements of the EHD. A percolation test with duration of four (4) hours was performed <br /> for the test. The last half an hour of the test was observed by Ms. Lisa Medina, Senior <br /> Registered Environmental Health Specialist, EHD. <br /> Measurement of the water level during the percolation test was from a fixed reference point on <br /> the PVC casing using an electric well sounder with a depth accuracy of 1/100th foot. All <br /> tabulated values on the field data sheet are in decimal feet. After water drop was observed, <br /> the holes were checked for refill. The refill level was approximately 0.5 feet (6 inches) of water <br /> above the bottom level of the percolation test hole. The readings were taken every 30 minutes <br /> for a period of four hours. <br /> "044 <br /> 902 Industrial Way•Lodi,CA 95240•209.367.3701 •Fax 209.369.4228 ©2008 Neil O.Anderson&;associates,Inc <br />