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File No. 20-2949-17 - - - -- -- _---- KLEINFELDER <br /> August 16 , 1991 <br /> On August 13 , 1991, a representative of our firm visited <br /> three residences located on the site and adjacent to the <br /> site on Airport Way. The purpose of the visits was to <br /> obtain information on septic system use and to inquire <br /> about any problems known to exist with this method of <br /> sewage disposal. None of the residences visited reported <br /> having problems with the performance of their septic <br /> systems. We were informed that "good" quality water is <br /> produced from an on-site well that serves the slaughter <br /> house. <br /> ITEM C-2 • <br /> "The suitability of the soil for development utilizing septic <br /> systems ; " <br /> On August 6, 1991, a representative of our firm drilled and <br /> set-up one 3-foot deep percolation test hole on the <br /> proposed 1. 5-acre parcel and on the designated remainder <br /> parcel . The test holes were drilled with hand drilling <br /> equipment using a 6-inch diameter continuous-flight auger. <br /> Perforated PLIC pipe was inserted into the test holes to <br /> prevent disturbance when adding water. The test holes were <br /> filled with relatively clean water and left to soak <br /> overnight. <br /> On August 7, 1991, our representative returned to the site <br /> to perform the 3-foot deep percolation tests. As per San <br /> Joaquin County guidelines, the tests were performed for a <br /> period of 4 hours. The last 30 minutes of each test were <br /> used to calculate the percolation rates. In order to use <br /> standard leach lines, the County requires a percolation <br /> rate of 60 minutes per inch, or faster, at the 3-foot <br /> depth. The 3-foot deep tests performed passed with a <br /> percolation rate of 30 minutes per inch for each parcel. <br /> The County approved percolation test sheet is included with <br /> this report. <br /> ITEM C-3 • <br /> "The depth and gradient of the water table; " <br /> During our residence surveys on August 13 , 1991, we were <br /> able to measure groundwater in two wells. The groundwater <br /> was measured at approximately 24 feet below existing ground <br /> surface (locations 1 and 2 on Plate I. ) The regional <br /> groundwater depth map published by the San Joaquin County <br /> Flood Control and Water Conservation District, Plate II, <br /> indicates the depth to groundwater in this area was <br /> approximately 25 feet in Fall 1990. <br /> Copyright 1991 Kleinfelder, Inc. Page 2 of 4 <br />