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h� KLEINFELDER <br /> File No. 20-2662-07 <br /> May 15 , 1991 <br /> the site area consists of agricultural and pasture land <br /> with scattered farm houses, and ranchette-type development. <br /> On April 22 , 1991, a representative of our firm visited <br /> seven residences located around the site area, as shown on <br /> Plate I. The purpose of the visits was to obtain <br /> information on septic system use and to inquire about any <br /> problems known to exist with this method of sewage <br /> disposal. No one was home at four of the residences <br /> visited; however, the three residents questioned indicated <br /> no problems with the performance of their septic systems. <br /> The septic systems were reported to be approximately 10 to <br /> 20 years old. All of the residents questions indicated <br /> that their wells produced "good" quality water. <br /> ITEM C-2 • <br /> "Suitability of soil for development utilizing septic systems. " <br /> On April 18 and 25, 1991, a representative of our firm <br /> drilled and set-up 3-foot deep percolation test holes on <br /> each of the proposed parcels. The test holes were drilled <br /> with hand drilling equipment using a 6-inch diameter <br /> continuous-flight auger. Perforated PVC pipe was inserted <br /> into the test holes to prevent disturbance when adding <br /> water. The test holes were filled with relatively clean <br /> water the day before testing and were left to soak <br /> overnight. <br /> On April 19 and 26, 1991, our representative returned to <br /> the site to perform the 3-foot deep percolation tests. As <br /> per San Joaquin County guidelines, the tests were performed <br /> for a period of 4 hours. The last 30 minutes of each test <br /> were used to calculate the percolation rates. In order to <br /> use 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 <br /> percolation rates of 40, 12 , 40 and 16 minutes per inch for <br /> parcels 1 through 4 , respectively. The County approved <br /> percolation test sheets are included with this report. <br /> ITEM C-3 • <br /> "The depth and gradient of the groundwater table. " <br /> During our residence surveys on April 22 , 1991, we were <br /> able to measure groundwater in six wells. The groundwater <br /> Copyright 1991 Kleinfelder, Inc. Page 2 of 4 <br />