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File No. 20-3576-0 KLEltiFELi]ER <br /> April 24, 1992 <br /> As requested in the County "Conditions of Approval, " we <br /> collected water samples on April 1, 1992 from the well <br /> located on site and delivered the samples to FGL <br /> Environmental laboratory in Stockton for nitrate content <br /> and DBCP testing. The test results will be submitted under <br /> separate cover as soon as the results are available from <br /> FGL Environmental. <br /> This completes our scope of work at this time. Based on the above <br /> information, it is our opinion that the two proposed parcels are <br /> suitable for septic system use. However, because of the apparent <br /> artesian groundwater conditions in the area, in order to maintain <br /> the required 5-foot separation between the bottom of leach lines <br /> and groundwater, engineered "mound-type" systems with leach lines <br /> constructed in fill pads may be required. Prior to constructing <br /> leach lines in the existing soils, the depth to the artesian <br /> aquifer in the vicinity of the proposed leach lines should be <br /> determined by excavating test trenches or drilling test holes. We <br /> stress that the septic systems should be designed by a qualified <br /> engineer. Percolation tests are recommended in fill pads to <br /> confirm that the soils percolate according to County requirements. <br /> Based on our experience, in our opinion the subgrade soils could be <br /> susceptible to settlement when heavy loads, such as provided by <br /> Engineered Fill pads, are placed on the surface. Therefore, prior <br /> to placement of any Engineered Fill, we recommend that the <br /> construction site be evaluated by a qualified geotechnical <br /> engineer. <br /> The septic systems should be located and future wells should be <br /> constructed following County requirements. Continuous monitoring <br /> of the septic systems should be maintained throughout the duration <br /> of their use. Once this report is reviewed by Environmental Health <br /> Services, we would be pleased to furnish a proposal for providing <br /> whatever additional information they may require for their <br /> evaluation. <br /> This report was prepared in accordance with the generally accepted <br /> standard of practice which existed in San Joaquin County at the <br /> time the report was written. No warranty, express or implied, is <br /> made. <br /> Copyright 1992 KLeinfelder, Inc. Page 4 of 5 <br />