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TABLE B-4 — Historical Groundwater Gradient Data <br /> Date Groundwater Gradient(ft/ft) <br /> direction ma nitude <br /> 5/10/2016 322 Northwest 0.0046 <br /> 5/16/2016 335 Northwest 0.0026 <br /> 6/27/2017 292 Northwest 0.0020 <br /> 9/29/2017 179 South 0.0058 <br /> 12/21/2017 156 Southeast 0.0034 <br /> 3/21/2018 5 North 0.0038 <br /> 6/28/2018 180 South 0.0026 <br /> 7/9/2018 174 South 0.0041 <br /> 9/24/2018 166 South-southeast 0.0068 <br /> 12/18/2018 112 East-southeast 0.0020 <br /> 3/18/2019 342 North-northwest 0.0058 <br /> 6/27/2019 315 Northwest 0.0020 <br /> 7/11/2019 229 Southwest 0.0016 <br /> 9/25/2019 170 South-southeast 0.0044 <br /> 12/10/2019 194 South-southwest 0.0073 <br /> 3/26/2020 346 North-northwest 0.0033 <br /> 6/16/2020 182 South-southwest 0.0021 <br /> Notes:Gradient calculated using contours near former ammonia tanks <br /> X:\Project\6000_prj\6847 Raymond Investments-Helena Chemical\Reports\2020Q2\20200624-6847 historical.xlsx <br />