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Richland Communities Inc. 6008.5.001.03 Lawrence and Award Property December 3,2003 SEPTIC FIELD SOIL SUITABILITY STUDY Page 3 Percolation Test Preparation One 12-inch-diameter percolation test hole was drilled to a depth of 42 inches below the existing ground surface at the approximate location shown on Figure 2. Following drilling, the sides of the holes were scraped to remove smear from the drilling process and loose material was removed from the base of each hole. Preparation of the percolation test hole began by placing two inches of pea-sized gravel in the bottom of each hole. A four-inch-diameter PVC pipe with slois c t in_the_bottom twelve inches was then placed in the hole and the pipe surrounded by proximately 2 feet of additionalgravel. Water was added to the hole up to the ground surface and allowedto pre-so ovemrggm.— Percolation Testing p The percolation test was performed at the Property on November Ok , 2002. Upon completion of the overnight presoak, water was no longer remaining in the test hole. The hole was refilled with water to a level approximately 6-inches above the gravel base at the bottom of the pipe. The water level was measured every 10 minutes for a 30-minute period. After the 30-mminute period the water level was reset to approximately 6-inches above the gravel base. Since six inches of water did not all percolate in the first 30 minutes, the measurement interval was increased to 30- minutes and the process was repeated for four hours. The completed San Joaquin County percolation test rate Form lc (EHD 42-02-003 revised 5/7/02) is attached as Appendix C. The last stabilized measurement was performed under the observation of a San Joaquin County Environmental Health Specialist and was used to determine the percolation rate of 6.1 minutes per inch. Conclusion Based on the results of the percolation test, soil profile, and historic use of existing septic systems in the vicinity of the Property, it is our opinion that the location of the percolation test is suitable for use with a properly designed conventional or alternative engineered septic system. The findings of this report are based on the conditions encountered during our soil profiling and percolation testing and may not represent all percolation conditions that may be encountered across the Property or during construction of a sewage disposal system at the site. It should be noted that additional testing may be recommended by ENGEO and/or San Joaquin County prior to construction of structures and septic systems, depending upon the final location of proposed structures or grading schemes. ENGEO should review final septic system designs prior to construction. In the event that conditions during construction differ from those encountered in our percolation test hole; ENGEO should be contacted to provide additional recommendations.