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Den Hartog Property Page 7 of 9 Our Project Number: LGS080514 May 23, 2008 )6.3 Boring Preparation and Presaturation Four (4) shallow percolation test holes were drilled on the property with a hand auger on March 5, 2008. A 1.5-inch diameter PVC pipe with perforations on the bottom was used to measure the drop of water in the percolation test boring. Approximately 2 inches of "pea gravel' were placed in the bottom of the open soil boring, and then the PVC pipe was installed on top of the gravel. "Pea gravel"was then used to backfill in the annular space. Presaturation of the percolation test holes occurred approximately 24 hours prior to the day of testing. The depth of water used to pre-soak was 12 inches above the bottom of the boring. I/6.4 Condition of Borings after Presaturation After the 24-hour soak period, the presaturated holes were found to be intact and dry on the day of testing. ✓6.5 Percolation Test Procedure Percolation tests were conducted for the borings on May 6 and 7, 2008 in accordance with the requirements of the EHD. A percolation test with duration of four (4) hours was performed for the test. The last half an hour of the test was observed by Ms. Lisa Medina, Senior Registered Environmental Health Specialist, EHD. Measurement of the water level during the percolation test was from a fixed reference point on the PVC casing using an electric well sounder with a depth accuracy of 1/100th foot. All tabulated values on the field data sheet are in decimal feet. After water drop was observed, the holes were checked for refill. The refill level was approximately 0.5 ft (6 inches) of water above the bottom level of the percolation test hole. The readings were taken every 30 minutes for a period of four hours. /6.6 Percolation Test Forms and Results The completed percolation test form is included in the appendix of this report. A shallow percolation test is defined by the EHD as being between 36 and 42 inches in depth; a satisfactory percolation rate for a shallow test is less than or equal to 60 minutes per inch drop. A deep percolation test is defined as being between 3.5 and 25 feet in depth; a satisfactory percolation rate for a deep test is 30 min/in or less. One percolation test must demonstrate a satisfactory percolation rate within the proposed septic system disposal field of each parcel to utilize a standard septic system. Details of the percolation tests are summarized in the next table. '044 902 Industrial Way•Lodi,CA 95240•209.367.3701 •Fax 209.369.4228 02008 Nei!O.Anderson&Associates,Inc