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File No. 20-3653-01 ]�� KLEINFELDER <br /> July 27 , 1992 <br /> explorations, the property contained a grape vineyard. <br /> Orchards and grape vineyards were present on the majority of <br /> the property surrounding the site. Residences with <br /> associated outbuildings, wells, and septic systems were <br /> located east, west, and north of the property. <br /> On June 16, 1992 , a representative of our firm visited four <br /> residences located off Lathrop Road at the approximate <br /> locations indicated on Plate I. The purpose of the visits <br /> was to obtain information regarding septic system use and to <br /> inquire about any problems known to exist with this method <br /> of sewage disposal . The residents reported having no <br /> problems with the performance of their septic systems. All <br /> of the residents indicated that their wells produced "good" <br /> quality water. <br /> Our representative also performed a review of County septic <br /> system permit records. We were not able to locate any <br /> recent permits for the replacement or repair of septic <br /> systems in the site area. <br /> ITEM C-2 • <br /> "The suitability of the soil for development utilizing septic <br /> systems; " <br /> On July 6, 1992 , a representative of our firm drilled and <br /> set-up one approximate 3-foot deep percolation test hole on <br /> each of the proposed parcels at the approximate locations <br /> shown on Plate I . The test holes were drilled with hand <br /> drilling equipment using a 6-inch diameter, continuous- <br /> flight auger. Perforated PVC pipe was inserted into the <br /> test holes to prevent disturbance when adding water. The <br /> test holes were filled with relatively clean water and were <br /> left to soak overnight. <br /> On July 7, 1992 , our representative returned to the site to <br /> perform the percolation tests. As per San Joaquin County <br /> guidelines, because of very fast percolation rates, the <br /> tests were performed taking measurements at 10 minute <br /> intervals. The last 10 minutes of each test were used to <br /> calculate the percolation rates. In order to use standard <br /> leach lines, the County requires a percolation rate of 60 <br /> minutes per inch, or faster. The tests performed passed <br /> with percolation rates of approximately 5 and 3-1/2 minutes <br /> per inch for the tests on parcel 1 and parcel 2 , <br /> respectively. The County approved percolation test sheet is <br /> included with this report. <br /> Copyright 1992 Kleinfelder, Inc. Page 2 of 4 <br />