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File No. 20-3689-01 1H KLEINFELDER December 4, 1992 On November 20, 1992, a representative of our firm visited four residences along Lammers 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. All residents indicated that their wells produced "hard" water but overall it was of "good" quality. One resident uses a water softener. 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, 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 19, 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 a percolation rate of 15 minutes per inch for each parcel. The County approved percolation test sheet is included with this report. ITEM C-3: "The depth and gradient of the water table;" During our surveys on November 20, 1992, we were unable to measure groundwater in wells located at the locations visited because the groundwater was below the 150-foot length of our measuring cable. The regional groundwater depth map published by the San Joaquin County Flood Control and Water Conservation District, Plate II, does not indicate the depth to groundwater in this area. Based on County requirements for a parcel split project such as this, we are not required to establish an on-site groundwater gradient by drilling borings. We are providing a general estimate of the groundwater gradient based on the published map. Based on the groundwater map showing lines of equal elevation of groundwater, Plate Copyright 1992 KLeinfelder, Inc. Page 2 of 3