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p.1 <br />9 k F INFELDIR <br />IIx annular space betwccn the screen mid the wall or the boring is backfilled with <br />the appropriatc clean sand to approximately 2 feet above the top Of the Perforated <br />sections. Based on soil logs or a sieve test, modifications may be made regarding <br />the size of sand to be usW. Installation of the sand may require that the sand be <br />tremmied. using clean water. <br />A 3- to 5 -foot bcntonite plug is placed above the sand, pack to provide a seal <br />against surface water infiltratic-ri and to reduce the potential for cement gout to <br />infiltrate into the water. <br />SIMMMMM.,= III <br />The wells are secured in an abovagrourA or undergrourid locking stovepipe. The <br />well heads may be enclosed in a water tight cement utility box set Hush to the <br />ground surfacc when located in a traffic area. <br />The wells we developed to reduce the effects of drilling on the formation and to increase the <br />effective hydraulic radius of the wells. <br />41 <br />results. The drums am labeled with the date, well number, and a contact person and phone <br />number. <br />B-3.3 Equipment Decontamination <br />To reduce the Potential for cross -contamination between wells, developing equipment is washed <br />in a trisodium phosphate or nort-phosphate detergent solution and rirwd in distilled water or <br />steam cleaned pxior to use -in the next monitoring well. <br />20-YN-611;2MIP163 Pne 8-5 <br />CapyiigM 2001, KWnftlder, Jor- line 14, 2001 <br />