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an <br /> OEOMATRIX <br /> am Construction of all wells will be in conformance with the following provisions. A <br /> TYPICAL MONITORING WELL CONSTRUCTION DIAGRAM is attached. <br /> 1. <br /> 2.1 WELL SCREEN AND CASING <br /> r. <br /> The well casing will generally consist of threaded stainless steel or polyvinyl chloride <br /> 1.. (PVC) schedule 40 (minimum) casing. The inside diameter of the casing will be large <br /> enough to permit easy passage of an appropriate water level probe and equipment for <br /> purging wells and water sample collection. <br /> The well screen will generally consist of machine-slotted or wire-wrapped PVC or stainless <br /> steel screen. The slot sizes will be compatible in size with the selected filter material. The <br /> screened sections will provide flow between the target zone and the well, allowing effi- <br /> ciency in well development and collection of representative samples. <br /> rs <br /> 2.2 FILTER MATERIAL <br /> +� Filter material will be well graded, clean sand with less than 2 percent by weight passing a <br /> No. 200 sieve and less than 5 percent by weight of calcareous material. The filter material <br /> ;r will be either a standard sand gradation designed for a range of anticipated soil types or a <br /> sand gradation specifically designed to fit the soils collected from anticipated well <br /> completion zones. <br /> 2.3 SETTING SCREENS AND RISER CASING <br /> Upon completion of drilling and/or geophysical logging, the boring will be sounded to <br /> verify the total depth, and the well casing will be assembled and lowered into the boring. <br /> Well casing materials will be measured to the nearest 0.01 foot and steam cleaned before <br /> '~ being lowered into the borehole. The casing and screen will be suspended a few inches <br /> above the bottom of the boring. The well assembly will be designed so that the well screen <br /> too is opposite the target zone. The bottom of the screen will typically be flush with the <br /> bottom of the well and will be fitted with a secure bottom cap. The PVC casing and well <br /> sm screen joints will be flush coupled. No PVC cement or other solvents will be used to <br /> INSTALLATION AND DESTRUCTION OF WELLS p <br /> %1SCIGEOMATM.PRO REVISION DATE:NOVEMBER 1992 Page 2 of 8 <br /> L <br />