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File No. 20-2026-78.005 -- kT1 K L E I N F E L D E R April 3, 1995 for a period of 4 hours. The last 30 minutes of each test was 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. Each of the percolation tests passed with rates of 60 and 1 minute per inch for parcel 1 and 2, respectively. The County approved percolation test sheet is included with this report. Item d-3: "The depth and gradient of the water table;" During our surveys on March 21, 1995, we were not able to measure groundwater in the wells located on the Grupe property. The most recent regional groundwater depth map published by the San Joaquin County Flood Control and Water Conservation District, Plate II of this report, indicates that the depth to groundwater in this area was approximately 20 to 25 feet in spring 1994. In discussions with the property owners, we understand that groundwater currently is between approximately 20 to 25 feet deep. Based on the 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. The most recent groundwater map showing lines of equal elevation of groundwater, Plate III of this report, indicates a groundwater gradient in approximately the southeast direction in spring 1994. As requested by San Joaquin County Environmental Health in their "Conditions of Approval," we collected water samples from the domestic wells located on proposed parcels 2 and 3, and from an agricultural well located at the north end of the proposed parcel 3. The samples were delivered to FGL Environmental Laboratory in Stockton for DBCP and nitrate content testing. The test results from FGL Environmental Laboratory will be provided under separate cover. We note that our scope of services did not include a detailed evaluation of the potential for the septic systems to affect the quality of the groundwater. However, the project involves the possibility of only one or two additional septic systems within the approximate 357.5-acre property. Therefore, in our opinion the likelihood of a significant change in the nitrate level of the groundwater beneath the site, because of one or two additional septic systems, is very remote. This completes our scope of services at this time. Based on the above information, it is our opinion that the proposed parcels are suitable for septic system use. Any new or replacement septic systems should be located and any future wells should be constructed following County Copyright 1995 Kleinfelder, Inc. Page 3 of 4