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File No. 20-2026-78.005 April 3, 1995 Items d-1 and d-4• "The intensity and extent of the existing and the proposed development project's use of septic tanks within and around the area;" (d-1). "The history of past uses in the project area to assess potential problems;" (d-4): Reference is made to Plate I of this report which shows the location of the Grupe property. At the time of our field explorations, the majority of the property contained open disked field and orchard. The surrounding area contained predominately orchards, grape vineyards, row crops, and pastures. On March 21, 1995, a representative of our firm visited the residence located on site. The purpose of the visit 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 system, which are inspected annually, and they indicated that their domestic wells produce "good" quality water. Our representative also performed a review of San Joaquin County septic system permit records. The records do not contain any recent permits for septic system repairs for residents located in the site area. Item d-2: "The suitability of the soil for utilizing septic systems, including percolation rates and soil profiles;" San Joaquin County required that one percolation test be performed on each of the proposed parcels 1 and 2 only. On March 21, 1995 a representative of our firm drilled and set up one approximate 3-foot deep percolation test hole on each of the proposed parcels 1 and 2 at the approximate locations shown on Plate I of this report. The test holes were drilled with hand drilling equipment using a 6-inch diameter, continuous-flight auger. A thin layer of gravel and perforated PVC pipe were 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 March 22, 1995, our representative returned to the site to perform the percolation tests and each of the test holes were dry. Before the tests could be performed, heavy rains began and flooded the percolation test holes. Therefore, the tests were postponed to allow the site to dry. On March 24, 1995, our representative returned to the site to perform the percolation tests. The tests were performed per San Joaquin County guidelines Copyright 1995 Kleinfelder, Inc. Page 2 of 4