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File No. 20-3855-O1.G01 K L E 1 N F E L D E^ May 3, 1995 the pit should be sloped no steeper than 4:1 (4 horizontal to 1 vertical), and the slope between the low flood plain and fill should be flattened to no steeper than 4:1. Prior to placing any Engineered Fill, we recommend that the exposed surface soils within the existing fill area be scarified and recompacted to a minimum depth of 12 inches. The sideslopes of the pit below the 4:1 sloped upper portion need not be compacted, and the upper 4:1 sloped area can be compacted once the remainder of the pit is backfilled to the bottom of the sloped portion. We recommend that the low flood plain area that will receive Engineered Fill be scarified and recompacted to a minimum depth of 6 inches. The recommended minimum degree of compaction is 90 percent of the maximum dry density as determined by the ASTM D-1557 test method, at a moisture content near optimum. Any extremely loose soils or concentrated pockets of debris encountered during the overexcavation and recompaction process should be overexcavated to stable soil and recompacted. The contact slope between Engineered Fill and existing soils beneath any proposed building pad should be no steeper than 4:1. I Engineered Fill required to backfill the pit, raise the lower flood plain area to above the 100- year flood level, construct the berms on the east and south portions of the site, or used on any areas of the site can consist of on-site soils or imported soils. . As a guide, we recommend imported soils have a maximum percentage passing the No. 200 Sieve of 40, a maximum. Plasticity Index of 8, and a minimum -Value of 40. We recommend that samples of any i proposed imported fill soils be submitted to the geotechnical engineer for approval prior to being taken to the site. .F If desired, concrete debris can be buried in the deeper portions of the Engineered Fill.. Concrete pieces can be up to several feet in size provided care is taken to space the concrete pieces so that no voids are created between pieces. We recommend that the larger debris be buried in the berm where future excavations will be less likely. In addition, it is extremely important that the concrete be buried below the depths of any proposed excavations for ;foundations or underground utilities or any possible future excavations. Concrete should also be buried deep enough that excavations for landscaping around the residences will not be restricted. Engineered Fill should be placed in horizontal layers a maximum of 8 inches in loose thickness and be compacted to a minimum of 90 percent of the maximum dry density as determined by the ASTM D-1557 test method, at a moisture content near optimum. Where large concrete debris pieces are placed, hand compaction may be required in order to properly compact the soils adjacent to the concrete pieces. We recommend that the berms.and any other proposed fill slopes be constructed at slopes no steeper than 2:1. The slopes should be protected from erosion as soon as possible after construction by planting vegetation or by other means. The flow of water over the face of the fill slopes should be minimized by constructing channels. Copyright 1995 Meinfelder,Inc. Page 5 of 10