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Work Plan – Ellis Avenue Detention Basins <br /> Advance 8-inch Hollow-Stem Auger to approximately 30 feet below existing ground <br />surface, soil sample ever 5 feet <br /> Install a two-inch diameter PVC pipe (30 feet long) <br />o 15 feet solid pipe on top <br />o 15 feet slotted pipe (0.01 inch diameter) on bottom <br /> Place #212 sand filter pack on lower 17 feet of pipe <br /> Place approximately 2 feet of bentonite seal over sand filter pack <br /> Place cement grout from bentonite seal to existing ground surface <br /> Install monument box <br /> <br />Additional Details <br /> <br /> We are installing these to monitor groundwater for proposed construction of detention <br />basins. <br /> Collect the groundwater data from the dataloggers (three visits) for the period from <br />January 2022 through May 2022 (subject to change based on start date of work). <br /> Each monitoring well will be instrumented with a downhole datalogger set to read <br />groundwater measurements at one-hour increments. <br /> <br />