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— - - - - -- - ---- -- --- ----- ---- --- �� KLElVEELDER <br /> File No. 20-3451-01 <br /> February 27 , 1991 <br /> was inserted into the test holes to prevent disturbance <br /> when adding water. The test hcles were filled with <br /> relatively clean water and left to soak overnight. <br /> On February 20, 1991, our representative returned to the <br /> site to perform the 3-foot deep percolation tests . As <br /> per San Joaquin County guidelines, the tests were <br /> performed for a period of 4 hours . The last 30 minutes <br /> of each test were used to calculate the percolation <br /> rates. In order to use standard leach lines, the County <br /> requires a percolation rate of 60 minutes per inch, or <br /> faster, at the 3-foot depth. The 3-foct deep tests <br /> performed passed with a percolation rate of 13-1/2 <br /> minutes per inch for each parcel. The County approved <br /> percolation test sheet is included with this report. <br /> ITEM C-3 • <br /> "The depth and gradient of the groundwater table. " <br /> During our residence surveys on February 15 , 1991, we <br /> were able to measure groundwater in 2 wells . The <br /> groundwater was measured at approximately 58 and 60 feet <br /> below existing ground surface (locations 3 and 4 , <br /> respectively, on Plate I. ) The regional groundwater <br /> depth map published by the San Joaquin County Flood <br /> Control and Water Conservation District, Plate II , <br /> indicates the depth to groundwater in this area was <br /> approximately 55 to 60 feet in Spring 1990 . <br /> Based on County requirements for a small parcel split <br /> project, we are not required to establish an on-site <br /> Copyright 1991 C einfelder, Inc. 3 <br />