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File No. 20-3698-01 KLEINFELDER February 16, 1993 On January 29, 1993, a representative of our firm visited five residences located off Northland and Austin Roads at the approximate locations indicated on Plate I. The purpose of the visits was to obtain information regarding septic system use and problems with this method of sewage disposal, and to measure groundwater in accessible wells near the site. The residents reported having no problems with the performance of their septic systems. All residents indicated that their wells provided "good" quality water; however, one resident reporting his water was high in nitrate content and they use a softener. Our representative also performed a review of County septic system permit records. The records do not contain any recent permits for residences in the site area. ITEM C-2: "The suitability of the soil for development utilizing septic systems;" On February 10, 1993 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 February 11, 1993, 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 20 and 60 minutes per inch for the tests on the proposed "parcel 1" and "parcel 2," respectively. 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 January 29, 1993, we were able to measure groundwater in wells located at two of the five locations visited (locations 3 and 5 on Plate 1). Groundwater was measured at depths of approximately 40 and 43 feet below existing ground surface at locations 3 and 5, respectively. The regional groundwater depth map published by the San Joaquin County Flood Control and Water Conservation District, Plate I1, indicates the depth to groundwater in this area was approximately 40 to 50 feet in spring 1992. Copyright 1993 Kleinfelder, Inc. Page 2 of 3