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DDJC*y OU 1 Pesticide Remediation <br /> Groundwater Extraction Well Installation Work Plan <br /> Sharpe/Tracy Comprehensive Field Work Plan Radian International, 1999,DDJC-Tracy Site <br /> (URS, 2001). All abandonment procedures will OU 1 Groundwater Treatment for <br /> be performed in accordance with federal, state, Pesticides, Pre-Design Technical <br /> and county regulations to assure that the quality Summary.Final. October. <br /> of the groundwater is protected and possible <br /> physical hazards to humans is eliminated. Radian International,2000. DDJC-Sharpe/Tracy <br /> Waste Management Plan. <br /> 6.4.2 As the casing,pre-pack filter pack, and <br /> bentonite sleeve are pulled out of the ground, URS,2001.DDJC-Sharpe/Tracy Comprehen- <br /> grout will be injected to fill the boring. In the sive Field Work Plan. February. <br /> event that the casing breaks or the soil has <br /> collapsed around the casing,preventing it from URS, 2002.DDJC-Tracy OU 1 Pesticide <br /> being pulled out,the boring will be drilled out Remedial Design 100%Submittal.May. <br /> using hollow-stem auger techniques and <br /> backfilled with grout. <br /> 6.4.3 Cement grout will consist of Type II <br /> Portland cement with 3 pounds of powdered <br /> non-beneficiated bentonite and 7 gallons of <br /> water per 94-pound sack of cement.The cement <br /> grout will be mechanically mixed with a paddle- <br /> type mixer and then tremied in place. No <br /> accelerator will be added to the grout. <br /> 6.4.4 To convert a temporary piezometer to a <br /> permanent piezometer,a cement grout will be <br /> used to fill the annular space above the bentonite <br /> seal already in place.Cement grout will consist <br /> of Type II Portland cement with 3 pounds of <br /> powdered non-beneficiated bentonite and 7 <br /> gallons of water per 94-pound sack of cement. <br /> The cement grout will be mechanically mixed <br /> with a paddle-type mixer and then tremied in <br /> place.No accelerator will be added to the grout. <br /> In addition,a water-tight,6-inch diameter <br /> subsurface utility box will be installed over the <br /> top of each piezometer.The top of each utility <br /> box will be completed slightly above the <br /> surrounding grade and concrete will be sloped to <br /> allow water to drain away from the protective <br /> well box. <br /> 7.0 REFERENCES <br /> Neuman,S.P., 1975.Analysis of Pumping Test <br /> Data from Anisotropic Unconfined <br /> Aquifers Considering Delayed Yield <br /> Gravity Response.Water Resources <br /> Research,V.11,pp. 329-342. <br /> KA02237\0U 1_Pest-Rem\final\GW-EW-WrkPln.dm 10 June 2002 <br />