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*AM01 %./ July 13,2001 Job Number: LGO1-191 Page 6 soil borings were drilled and percolation test was conducted. A table summarizing the soils encountered is presented in the appendix. One percolation test was conducted at the site. The percolation test was set adjacent to the 10-foot soil boring and was drilled utilizing a 4-inch truck mounted"Deep Rock"auger drilling rig. The depth of the percolation test was two feet. The casing used for the test was 2- inch diameter PVC pipe with an open end on the top and bottom. Perforations were made on approximately the last 12 inches of the casing. Two inches of "pea gravel"was placed in the bottom of the hole, the casing was installed, and four inches of"pea gravel"was backfilled in the annular space. The percolation test boring was pre-soaked 24-hours prior to the test. A four hour percolation test was conducted on June 21, 2001 in accordance with the requirements of San Joaquin County PHS-EHD. The last hour of the percolation test was r observed by Mr. Johnny Yoakum, Environmental Health Specialist of San Joaquin County PHS- EHD. Table 5 presents a summary of the percolation test. Table 5. Summary of the Percolation Test. Percolation Test Percolation Test Depth to Ground Percolation Rate Comment No. Depth(ft) Water(ft) (minutes/inch) P-1 2.0 4.8 250 Failed Test A satisfactory percolation rate is less than or equal to 60 minutes per inch(drop). Normally, if a septic field percolation test does not achieve a satisfactory percolation rate, the project will be required by the San Joaquin County PHS-EHD to utilize an engineered (non- standard type) septic system for onsite sewage disposal. In addition to the soil suitability study, a nitrate loading study was required for project approval by San Joaquin County PHS-EHD. =pElS 1 � z r O � �rS p C♦