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<br />Primary <br />Environmental <br />Factors <br /> <br />A. Surficial and <br />Bedrock <br />Geological <br />Conditions <br /> <br />. <br /> <br />. <br /> <br />B. Groundwa ter <br /> <br />* <br /> <br />- 10 - <br /> <br />LANDSPREADING OF SLUDGE AT AGRONOMIC RATES <br />------- --- - ----- -- <br /> <br />ST E P 1 <br />SCREENING <br /> <br />~referable <br /> <br />Soil types with slopes from <br />0-12 percent with incorpora- <br />tion of sludge into soil <br />with 6-12 percent slopes.. <br /> <br />Areas with depth to bedrock <br />greater than 10 feet. <br /> <br />Areas without fractures or <br />faults within 6 feet of <br />surface. <br /> <br />Soil types with medium to <br />fine texture. <br /> <br />Cation exchange capacity <br />greater than 15 milliequive- <br />lants per 100 grams of soil. <br /> <br />Soil types with depth to <br />groundwater table greater <br />than 10 fee t. <br /> <br />Area is not a recharge area <br />for a major aquifer. <br /> <br />Groundwater flow direction <br />away from current or <br />potential potable water <br />supplies. <br /> <br />Greater than 200 feet from <br />a local potable water supply <br />well.. <br /> <br />Suitable <br /> <br />Soil types with slopes <br />greater than 12 percent <br />require terracing.. <br /> <br />Areas with depth to bed- <br />rock greater than 3 feet <br />fine and medium texture <br />soils or greater than 6 <br />feet for coarse texture <br />soils.* <br /> <br />Areas with fractures or <br />faults within 6 feet of <br />surface .p <br /> <br />Soil types with coarse, <br />very coarse or gravel <br />texture. Organic soils if <br />drained. <br /> <br />Cation exchange capacity <br />sufficient to handle metal <br />deposit.* <br /> <br />Soil types with depth to <br />groundwater table greater <br />than 3 feet for medium and <br />fine texture soils and 6 <br />feet for coarse texture <br />soils.* <br /> <br />Area is a recharge area <br />for a major aquifer. <br /> <br />Groundwater flow direction <br />towards current or <br />potential potable water <br />supplies. <br /> <br />At least 200 feet from a <br />local potable water supply <br />well.. <br /> <br />Indicates criteria same as MPCA Temporary Sewage Sludge Disposal <br />Standa rd s. <br />