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File No. 20-3648-01 KLEINFFLDER July 7, 1992 "The history of past uses in the project area to assess potential problems; " (C-4) : Reference is made to Plate I of this report which shows the location of the Etcheverry property. At the time of our field explorations, the property contained a walnut orchard. Row crops such as tomatoes and beans or peas were present north and west of the site. Residences with associated outbuildings, wells, and septic systems were located east § and west of the proposed "parcel 1" and along Banta Road. On June 22 , 1992 , a representative of our firm visited three residences and the walnut hulling facility located off Banta Road at the approximate locations indicated on Plate I. The purpose of the visits was to obtain information regarding septic system use and to inquire about any problems known to exist with this method of sewage disposal. The residents reported having no problems with the performance of their septic systems. One of the residents indicated that their well produced "good" quality water. The remaining two residents indicated that they used bottled water for drinking. Our representative also performed a review of County septic system permit records. The records do not contain any recent permits for the older residences in the site area. The relatively new residence at location 1 on Plate I constructed their septic system approximately two years ago. E` ITEM C-2 : "The suitability of the soil for development utilizing septic j systems;" On June 29, 1992 , a representative of our firm drilled and set-up one approximate 3-foot deep percolation test hole on each of the proposed parcels at the approximate locations shown on Plate I. The test holes were drilled with hand drilling equipment using a 6-inch diameter continuous-flight auger. Perforated PVC pipe was inserted into the test holes to prevent disturbance when adding water. The test holes were filled with relatively clean water and were left to soak overnight. i On June 30, 1992, our representative returned to the site to perform the percolation tests. As per San Joaquin County ' guidelines, the tests were performed for a period of four hours. The last 30 minutes of each test were used to calculate the percolation rates. In order to use standard leach lines, the County requires a percolation rate of 60 Copyright 1992 U einfeider. Inc. Page 2 of 4 1