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File No. 20-3576-0 KLEiNFELDER April 24, 1992 "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 Fagundes property. The majority of the site area consists of agricultural and pasture land with scattered residences. } On April 3 , 1992 , a representative of our firm visited three residences located off Grant Line and Lammers Roads. 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. None of the residents questioned reported having problems with the performance of their septic systems. We were informed that their private wells produced "good" quality water. ITEM C-2: The suitability of the soil for development utilizing septic systems; " On March 31, 1992, a representative of our firm drilled and set-up one 3-foot deep percolation test hole on each of the proposed 2-acre and "designated remainder" parcels. 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 left to soak overnight. i On April 1, 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 ; 4 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. Both ' tests failed to meet this percolation rate. On April 13 , 1992, a representative of our firm returned to i the site and drilled and set-up one additional 3-foot deep test hole on each of the proposed parcels. On April 14, 1992 , our representative returned to the site and performed the percolation tests. Passing percolation rates of 40 and 60 minutes per inch were obtained for the proposed 2-acre and "designated remainder" parcels, respectively. The approximate locations where the passing percolation rates were obtained are:, shown on Plate I. The County Copyright 1992 C einfelder, Inc. Page 2 of 5