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r. Mr.Jadi Singh January 24,2003 Job Number: LE02481 ` Page 9 5.2 Double Ring Infiltrometer Tests A total of two,4-hour double ring infiltration tests were performed on November 23 and 25, 2002 to determine the infiltration rate of the soil at a depth of 0.25 feet and 1.9 feet. A double r ring infiltrometer test is described by ASTM D 3385-94 standard for measuring the infiltration rate of soil. The ASTM D 3385-94 standard is attached in the appendix. The rings were driven in the soil with a sledge hammer and driving plate to approximately 4 inches below the exposed .. soil surface. The soil was supersaturated prior to performing each test. The double ring infiltrometer tests were configured with a reservoir and float system to maintain a constant head in each ring approximately 1 inch above the soil. A spike(a large nail)was placed in the soil inside each ring at the same elevation for reference. The level of the water in each ring was set equal in each ring and each ring was sealed from the other. Over a regular interval,the rate of fluid flow was noted as inches drop in the reservoir. Since the surface area is known for each ring,the resulting incremental infiltration rate was calculated and was plotted on semi-log paper(see the appendix for the graph of data). The infiltration for the inside ring is .. normally reported for the measurement since the most important purpose of the outside ring is to promote vertical flow of the inside ring. The following table is a summary of the infiltration rate of the shallow soil. Table 4. Summary of double ring infiltrometer tests. Test No., Duration Percolation Percolation Rate Soil Type,comment Date Tested of test Test Depth(ft) (minutes/inch) DR-1, 4 hour 1.90 51.9 min/inch LL bm silty f-m sand,loose(SW), 11/25/02 moderate percolation rate. DR-2, 4 hours 0.25 52.9 min/inch Dk bm silty f-m sand,loose(SW), 11/23/02 moderate percolation rate. .. The result of the infiltration tests indicated the infiltration rate of the surface layer is about 52 to 53 minutes per inch for depths between 0.25 and 1.9 feet. 6.0 ESTIMATED WASTE WATER FLOW The average daily flow and peak flow of sewage for the proposed facility is unknown. Estimates of flow have been made from one of two similar facilities owned by Jadi Singh. An ARCO AM/PM facility, located at 15051 Rogers Road,Patterson, California is the most similar facility a