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File No. 20-3304-01 <br /> March 8, 1990 <br /> Page 2 <br /> obtained information on septic tank use and if any problems are ;Known to <br /> exist with this method of sewage disposal. Of the several people contacted, <br /> only one person reported having difficulty with his septic system . <br /> -approximately 3 weeks ago during a heavy rain storm his deep septic system <br /> backed up for a couple of dais. However, he reported that this has net <br /> been a problem in the past, nor does it appear to be a reoccurring problem . <br /> No other problems have been noted in the sewage disposal or of water <br /> quality in any of the existing domestic wells in the area. <br /> ITEM C-2: <br /> Suitability of soil for development utilizing septic systems. <br /> Reference is made to our geotechnical investigation during which we <br /> performed a Percolation Test. The measured percolation rate was 34 <br /> min/in. San Joaquin County requires a minimum percolation of 60 minutes <br /> per inch. The soils encountered during drilling operations were generally <br /> silty sand interbedded with silt and clays. The soil profile is ideal for <br /> filter and waste. For this reason it is our opinion that the soils meet the <br /> County guidelines. <br /> ITENI C-3: <br /> The depth and gradient of the groundwater table. <br /> No groundwater was encountered during our geotechnical investigation dated <br /> February 1 , 1990 . In order to comply with this requirement, 3 test borings <br /> were drilled on March 6 , 1990 , to depths of 25 feet. At the time the <br /> holes were drilled, groundwater was measured at depths of approximately 23 <br />