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File No. 20-3683-01 �... k" K LEIN FELDER December 3, 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 Robertson property. At the time of our field explorations, the property contained a recently disced field. It appeared that row crops such as tomatoes and beans had been grown on the site. Residences with associated outbuildings, wells, and septic systems were located north and south of the property along Linne Road. On November 10 and 20, 1992, a representative of our firm visited five residences on Linne Road at the approximate locations indicated on Plate I. The purpose of the visits was to obtain information regarding septic system use and to inquire about any problems known to exist with this method of sewage disposal. The residents reported having no problems with the performance of their septic systems. The residents indicated that their wells produced "adequate" quality water. Our representative also performed a review of County septic system permit records. The records do not contain any recent permits for the residences in the site area. ITEM C-2: "The suitability of the soil for development utilizing septic systems;" On November 18 and 20, 1992, a representative of our firm drilled and set-up one approximate 3-foot deep percolation test hole on each of the proposed parcels at the approximate locations shown on Plate I. The test holes were drilled with hand drilling equipment using a 6-inch diameter continuous-flight auger. Perforated PVC pipe was inserted into the test holes to prevent disturbance when adding water. The test holes were filled with relatively clean water and were left to soak overnight. On November 24, 1992, our representative returned to the site to perform the percolation tests. However, because of unstable surface soils that caved into the test holes, the holes had to be cleaned and set-up to be performed on the following day. On November 25, 1992, our representative returned to the site to perform the percolation tests. As per San Joaquin County guidelines, the tests were performed for a period of 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. The tests performed passed with percolation rates of 15 to 30 minutes per inch (mins/in.). The percolation rates Copyright 1992 Kleinfelder, Inc. Page 2 of 4