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On January 14, 1997, a representative of our firm visited the two residences located on and adjacent to the proposed Parcels 1 and 2. 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. It= d-2* "The suitability of the soil for utilizing septic systems, including percolation rates and soil profiles;" On January 14, 1997, representatives 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 1. The test holes were drilled with hand drilling equipment using a 6-inch diameter, continuous-flight augers. A small amount 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 January 15, 1997, our representative returned to the site to perform the percolation tests. Test hole P-I still contained water, and test hole P-2 was dry. The tests were performed according to San Joaquin County guidelines for a period of 4 hours. In order to use standard leach lines, the County requires a percolation rate of 60 minutes per inch, or faster. The last 30 minutes of each test were used to calculate a failing percolation rate of 240 minutes per inch for test P-1 and a passing percolation rate of 7 minutes per inch for test P-•2. On January 16, 1997, a representative of our firm drilled and set up two additional approximate 3-foot deep percolation test holes on the proposed Parcel 1 where the failing test was obtained. The test holes were prepared in the same manner as the previous tests. The test holes were filled with relatively-clean water and left to soak overnight. On January 17, 1997, our representative returned to the site to perform the percolation tests. The tests were performed according to San Joaquin County guidelines. The retest hole that was producing the fastest percolation rate was performed for a period of 4 hours, and the last 30 minutes were used to calculate a passing percolation rate of 8 minutes per inch. The retest location is indicated on Plate 1. On January 23, 1997, representatives of our firm drilled and set up one approximate 3-foot deep percolation test hole on each of the proposed Parcels 3 and 4 at the approximate locations shown on Plate 1. The test holes were prepared in the same manner as the previous tests. The test holes were filled with relatively-clean water and left to soak overnight. 20-2250-07.G011207RGO25 Page 2 of 4 January 27, 1997 Copyright 1997 Kleinfelder,Inc. KI EINFELDER 2825 East Myrtle Streel, Stockton, CA 95205-4794 (09) 948-1345 (209) 948-0621 fax