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10 May 2021 <br />Project No. 21-6390 <br />Page 8 of 14 <br />6.5. COMPLETED PERCOLATION TEST FORM <br /> <br />The percolation test was not completed. Field measurements recorded during the test are <br />included on the Percolation Test Rate Field Sheet provided in Appendix C. <br /> <br /> <br />6.6. PERCOLATION TEST FINDINGS <br /> <br />On site soils within the shallow percolation test hole demonstrated an inadequate <br />percolation rate. <br /> <br />AGI met with representatives of Blair, Church, and Flynn (Consulting Engineers) and <br />Krazan and Associates (Geotechnical Engineers) to discuss the results. AGI was <br />informed that the percolation test was conducted in material compacted to 95% during <br />construction of the berm and was not intended to be used for the final septic system <br />backfill. Prior to installation of the septic system, the top 10 feet of the compacted soil in <br />the disposal field area will be excavated, removed, and replaced with selected fill material <br />suitable for a standard wastewater treatment system. Following backfill of the selected <br />material, a new percolation test should be performed to calculate the percolation rate. <br /> <br /> <br />7.0. CHEMICAL AND PHYSICAL PROPERTIES OF SOIL <br /> <br />Soil chemical properties were supplied by regionally sourced material for the surrounding <br />area. <br /> <br /> <br />7.1. CHEMICAL AND PHYSICAL PROPERTIES OF SITE SOILS <br /> <br />The dominant soil composition in the project study area was inferred from information <br />provided by the United States Department of Agriculture’s Soil Geographic Database <br />(USDASGD). The USDASGD soil survey indicates the soil type for the project study area <br />is predominantly composed of Itano silty clay loam having 0 to 2 percent slopes (#179). <br />The Itamo silty clay loam is composed of alluvium derived from granitic rock sources. <br />Soils are described as somewhat poorly drained, with a very low permeability, and salinity <br />ranging from 0.0 to 2.0 millimhos per centimeter (mmhos/cm). The Itano silty clay loam <br />typically have similar chemical properties and soil profile between surface grade and 60 <br />inches bsg. <br /> <br /> <br />7.2. MASS TRANSPORT PROPERTIES OF UNDERLYING SITE SOILS <br /> <br />The dominant soil type at the site indicates that the soils are semi-permeable and have <br />moderate water storage. These soils will allow moderate infiltration of water through the <br />surface soils. The longer the effluent remains near the surface, the more treatment is