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File No. 20-3652-01 k" KLEINFELDER July 30, 1992 ITEMS C-1 AND C-4: "The intensity and extent of the existing and the proposed development on septic tanks within and around the area;" (C-1). "The history of past uses in the project area to assess potential problems;" (C-4): Reference is made to Plate I of this report which shows the location of the Chrowl property. The property includes rice, pasture, and barren land. The majority of the surrounding area contains rice and pasture with scattered houses. On July 15, 1992 a representative of our firm visited five residences located off Edwards Avenue and Campbell Road at the approximate locations indicated on Plate 1. The purpose of the visits was to obtain information on septic system use and to inquire about any problems known to exist with this method of sewage disposal. We were able to question residents at four of the locations visited. Three of the residents reported no problem with their septic systems. The resident at location 2 reported that when they moved in approximately two years ago their toilets backed up. The leach lines were "repaired," the septic tank was pumped, and they have had no problems since. All the residents indicated that their wells produced "hard" water. ITEM C-2: "The suitability of the soil for development utilizing septic systems;" On July 22, 1992, representatives of our firm drilled and set-up one approximate 3-foot deep, one approximate 91/2- to 10-foot deep, and one approximate 14- to 141/2-foot deep percolation test hole on each of the four proposed parcels at the approximate locations indicated on Plate I. The test holes were drilled with a truck-mounted drill rig equipped with 6-inch diameter, continuous-flight augers. Perforated PVC pipe was inserted into the test holes to prevent disturbance when adding water. The test holes were filled with approximately 2 to 3 feet of relatively clean water the day before they were tested and were left to soak overnight. On July 23 and 27, 1992, our representative performed the percolation tests. As per San Joaquin County guidelines, the tests were performed for four hours. The last 30 minutes of each test were used to calculate the percolation rates. In order to use standard leach lines, the County requires a percolation rate of 60 minutes per inch, or faster, at the 3- foot depth. In order to use sump pits, the County requires that a soil strata with a percolation rate of 30 minutes per inch, or faster, be located. The results of the percolation tests are presented in Table I, below. The County approved percolation test sheets are included with this report. Copyright 1992 Kleinfelder, Inc. Page 2 of 4