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� JUL 2 ' 91 16 : 50 FRENVIRONMENTAL SCI ENG <br /> ' PRGE . 009 <br /> c. P" C.__ <br /> M .. <br /> Telescoping or Hinged <br /> Cover <br /> Key Padlock <br /> T' Maximum <br /> Oversized Cap or Protective Casing <br /> `Sticku • Undersized Plug k" Oia. Drainage Port <br /> P _ / r—Coarse Gravel Blanket Z•5 <br /> Well Casing/Riser <br /> 4' <br /> ground o ° p ° 5 + Surface <br /> Internal Mortar Collar <br /> grout <br /> 25' <br /> Centralizer'- <br /> Coupling <br /> OVERSaRM <br /> 5' Minimum for Pellets <br /> Bentonite Seal or <br /> S' Maximum for Slurry <br /> 5;' Minimum <br /> O O <br /> Well Screen <br /> Filter Pack— 5' Maximum <br /> Cap or Plug o O T 31 maximum <br /> I <br /> SCHEMATIC CDNSTRUCTION OF <br /> OVERBURDEN WELL <br /> ng <br /> FIGURE 5 <br /> C-56 <br />