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Soil Suitability Study 33233 S. Koster Rd., Tracy, CA page 6 As is shown on the log for Well No.2, deeper soils consist of sands, gravels and clays in beds of varying thickness. That is typical of the region, which is covered by an alluvial fan emanating from the Inner California Coast Range. Section 5.4 Discussion of Soil Litholoev as Related to Future On-Site Septic Uses Being formed of silty clay (CL), the lithology of the upper 8 ft. of soil is such that percolation rates will be low. However, as is evidenced by the successful long-term operation of existing septic tanks and leach field systems on Parcel 1 of the subject property and on adjacent and / nearby properties on the same soil deposits, the soil lithology is not expected to cause problems / with any properly-designed septic systems that may be constructed elsewhere on the property in the future. (See Section 6.8 below for additional discussion of expected leach field performance on the subject property.) SECTION 6.0: PERCOLATION TEST INFORMATION Section 6.1 Site Map Showing The Location of The Percolation Test Holes A percolation test pit was excavated on each of the three parcels. Their locations are shown on Figure 4. Section 6.2 The Minimum Number of Shallow and Deep Percolations Tests Performed for Each Parcel A single shallow percolation test hole was located on each of the three parcels. No deep percolations tests were performed. Section 6.3 Description of The Date. Time and Protocol Used to Prepare The Test Holes The test holes were drilled on October 31, 2011 using a Bobcat with a 12 inch open flight auger. The holes were drilled to approximately 40 inches deep. The loose soil was removed from the — bottom of the holes using a manual post-hole digger and a shovel. Four inches of/< inch crushed rock was placed in the bottoms of the holes. Between 8 A.M. and 9 A.M on November 1, 2011 the holes were presoaked by pouring water into the holes so that there was a minimum depth of 12 inches above the bottoms. Section 6.4 Description of The Date Time and Condition of The Test Holes After The 24 Hour Soak Period On November 2, 2011 the test holes were inspected at 7 A.M. At that time, the holes contained no suing water. There had been some sloughing from the walls at the bottoms of the holes l�efe the water had been present. The bottoms of the holes appeared to be damp but there was no standing water present.