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File No. 20-3551-01 ]�"� KLEINFELDER May 26, 1992 Page 2 of 3 k In our discussion with Mr. Bill Helms of the State Drought Center, we understand that the State uses an annual average water consumption rate of 1 acre-foot per year for a family of five. This includes all water used for domestic purposes and landscape watering but excludes irrigation. This value is equal to approximately 900 gallons per day per family and approximately 14, 400 gallons per day for the sixteen proposed residences on an annual basis. As you can see by comparing the above figures, domestic use from sixteen wells constructed at the site would equal approximately 20 percent of the volume used annually over the thirty-two years of irrigation at the site. However, the above values for residential use do not include any irrigation water that may be used on the individual lots. It is our opinion that if portions of the lots are farmer:-, the volume of water used for irrigation and domestic purposes will still not equal the volume of water used annually during the thirty-two years of heavy irrigation. WATER TESTS As requested by Environmental Health Services personnel, on April 15, 1992 , a representative of our firm obtained samples from wells located at the two residences on the site. The samples were delivered to FGL .Environmental laboratory in Stockton for general mineral content and PCB testing. The test results are included with this report. CONSTRUCTION FEASIBILITY We understand that the . San Joaquin County Planning Department has requested information regarding the feasibility of constructing residences on the subject site. Although our scope of services for the septic system suitability study did not include test borings for geotechnical purposes, we did drill several test holes for percolation testing. The materials encountered in the percolation test holes were consistent with materials typically encountered in the site area. Based on our experience with projects in the site area for which our firm has provided geotechnical services, it. is our opinion that the sixteen proposed lots are suitable for typical residential construction. The structures can likely be supported on conventional spread and/or continuous foundations bearing on the existing materials or on Engineered Fill. One possible concern in the site area is the presence of expansive clay soils at the surface. However, if expansive clay soils are present beneath a proposed structure location, several methods exist to reduce the risk associated with constructing on expansive soils. Copyright 1992 C einfe[der, Inc.