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File No. 20-3514-01 k%1 KLEINFELDER September 11, 1991 2 . SEPTIC SYSTEM SUITABILITY STUDY A. General The septic system suitability study was performed to satisfy San Joaquin County requirements as described in Ordinance No. 3323 , Division 10, Chapter 2 , Section 9-10100, Item C. A description of the requirements and our scope of services were outlined in our proposal dated July 26, 1991. The items listed under Item C of the above ordinance are listed below, along with our responses. B. ITEMS C-1 AND C-4 : "The intensity and extent of the existing and the proposed development on septic tanks within and around the area; " (C-1) . "The history of past uses in the project area to assess potential problems; " (C-4) : On August 13 , 1991, a representative of our firm visited four residences located north and south of the site. The purpose of the visits was to obtain information on septic _ system use and to inquire about any problems known to exist with this method of sewage disposal . One of the residents questioned reported that his system drained rather slowly and the system is pumped every 1-1/2 to 2 years. The remainder of the residents questioned reported no problems with their systems. The septic systems were reported to be up to 30 years old. The residents reported that their on-site wells produced "fair" to "good" quality water. One resident uses a water softener. C. ITEM C-2 ' "The suitability of the soil for development utilizing septic systems ; " On August 21, 1991, a representative of our firm drilled and set-up one 3-foot deep percolation test hole on each of the four proposed parcels at the approximate locations _ shown on Plate A-1 of the appendix. 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 left to soak overnight. - On August 22 , 1991, our representative returned to the site to perform the 3-foot deep percolation tests. As per San Joaquin County guidelines, the tests were performed for a period of 4 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 Copyright 1991 Kleinfelder, Inc. Page 9 of 13