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: . -Glossary .. ..Desi n Considerations ..= . . <br /> affect whether or not natural attenua- asr :;to:-attach_by::physicat-or-chemical <br /> Many factors :.' ... - <br /> tion is a feasible treatment alternative. These :;fer :::::=an: under oundevio Teal <br /> ..aqui. :......__ gr -. <br /> include: .containn usable- amounts:'bf groundwatc <br /> . :.. <br /> ■ collected to make modeling as :supplY;.wells_and::springs <br /> Data must be _ g <br /> accurate as possible i- . :natural::prcess of e� <br /> iotegrncl atron: :the <br /> breakdown- m croor anisms in%the ens <br /> • Intermediate breakdown compounds may be :�'::::::. - . <br /> :often: orrriin non or.:ies:s:harm+.. =byprodt <br /> more mobile and more toxic than the original ... ::. ;:: <br /> contaminant. cbicaI:stabilization:-- reduction in cc <br /> • n3oilit caused b. chem Kcal:: roceses; <br /> • Natural attenuation should be used only in Y P- <br /> low risk situations. �ceanup actions: dor zemoving=contarr ri <br /> ane:environment--:-:: %-::%-%%;::::: ... : ::. <br /> ■ <br /> Contaminants may m i grate before they are : <br /> eon thdegraded. s ers processof mixAn :that�c <br /> • :fluid flo...thou a:porous medium <br /> n use of groundwater down- -.:.p:..:. .- <br /> Restrictions o gr <br /> gradient may have to be enforced until e tractio +ell :A well,where��water i­ <br /> to <br /> g . <br /> contaminant levels are reduced. n or .to..treat the <br /> 'water, and to .;refi re <br /> - .. ...pp�.�/-.-dry ... . . . . . <br /> vVlllelltr <br /> dater me_;.: .. <br /> Use at other Locations <br /> grouriater:-::plum ; :- A: :-body of .1 <br /> Natural attenuation has been used at hazardous :containing contaminants excee ding maxi <br /> wastes sites across the country. Although it is a famitiat ion. levels :(MCLs) as.-defined b <br /> component of remediation activities at many sites, :samples-frrri::anultiple wells Vin- the <br /> only in the last few years has it been analyzed MCIS.. :risk-based_:level w�Il:be establish <br /> specifically as a treatment strategy to be considered :.'.'.. <br /> naturalattenuation:: the process by wh <br /> along with other engineered solutions. . <br /> pound.'is.,reduced -in concentration ova <br /> natural''processes. <br /> recireu ating well::- :a process for captu <br /> ing,_ and .reieaserig W.. <br /> within <br /> = vve-ll..:::=- The. process_ s, not expected k <br /> .. . ............ <br /> . -- - ----- <br /> for Morenf�rma �n. <br /> a ect.t .e w terbe.. <br /> 'Addinformation about:.cleanup-:-:act vitles is. �:...-- :.:.. <br /> available on our. website: http://www,_mmr.org: <br /> re�n�e�ct�on:..R, ll:.....:a.. .we11, where_ clea. <br /> lease contact the Cornn�u <br /> pumped, n . e- aqui er,. to replace ec <br /> . ........ ......... <br /> .. <br /> :For more information, P <br /> water.that has:been:.remo ed.. .. <br /> n� =Involvement tiff ce:.._::for. the:::: Installation <br /> �Y <br /> :. . . ....... :..... it st:.'.: demonstrations of-:technolo <br /> Restorat�cn Program...by- culling:::.(5053=: 5g:.475 P <br /> of #e <br /> or b ..sendin an electro.'. mail:=:�i�iessage.:;::t :: <br /> to eve_uate pe orrn:anGe un er �e con <br /> y . <br /> iaiafmh:an .afmil :...:. results are .used toevelop.:plume resp <br /> Aka <br /> g <br /> natives and design full=scale treatment sy <br /> p1umQ:resporise..alternat s a.-speci. <br /> t cn ..... . <br /> "o f"treatment., :syt Orn(sbe corn <br /> evaluated. :- <br /> orpt on : the.:�abll ty of some substance, <br /> -or.:attract,contain irnants and.ho ld..o.nto the <br /> ........... <br /> volatiliation::..transfer.of.a chem mica frc <br /> vapar� evaporation: <br /> ozone,:of:recirculation:. aa:circular zone <br /> dater.movement,,-,create d by flow into .� <br /> recirculatingrellk` <br /> 4 <br />