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Chemical and biological apprecjatian of g cat stlbsurfa
<br /> ce that sub the
<br /> he rate of het, Processes, With
<br /> the unsaturat pollution w r ubiquitous it became greater These
<br /> ed zone as ubjqujtaus and evident reactive
<br /> low. ted to the dee a variety of Particles have
<br /> l°°w'Yleldjn sediments, p subsurface and impassed conditions in ba been shown to be
<br /> Crises 9 or imBermeab�o�iured roct� and a l gid cafumn eXpenments both field stud. s and l araije under
<br /> and heterogeneities mations. Sm+all_s monitoring programs and as such need t°ry
<br /> cont r!g cantamrnant were shown Caje pia- Conts"nant bad- where identificationo be incl
<br /> arninant flow d�tribuxtlo . be
<br /> jmpo ni in particles (dissolved 4f the tided in
<br /> Paths. and in can An meth �feassite is an objective. cation
<br /> susp °bile
<br /> 9 water odolo must that end,
<br /> 1#Js f'eYand fJte sco rlaiuraf�, most be used which do ed
<br /> the advances in Pe of particle nota rt'-sampling o
<br /> ,Tons and the field of flus Paper to su concentrations. Y bias
<br /> rnedlation tsut ground-water mmarize all Currently on ground-water sa particular.quality jnvestiga_ and samplin y the most common
<br /> Colloidal trans mplrng today: Dues high sperm 9 met mon gmund-
<br /> Y a have he hodolagy is to water
<br /> 1bw Paths Hort. Aquifer hater aqui heterogenei a by sarrrple pumps to re is r9e a Well using bailers hYdrplo and lachrde o9eneities a ty and move
<br /> gY andriations In ffect cantamjnant on sample �°� Tlrls casing volumes followed
<br /> available for microbiology As qualityMethod can
<br /> subsu methal. ge�mistry, ,$vets of tu►bjdj through calteCtion of scaa tis$ad, 'Tse gmFaets
<br /> dace jnvegN Bods and the tools �mob+le ty' This results c the elusion
<br /> e �ePfrrstrcated gh
<br /> understaairans have become jn of artifactual Partietes rnA! with hi
<br /> mint has tion certain which �erwjse
<br /> most rases a advanced, there rng of the subsu Cress- rnIn a nal es of intermit h
<br /> Charact primary concern for awarenessrface °rganjc Cp p duce ar:overestiiria_
<br /> eriz8tjon of that in associated j of
<br /> g'' metals Or h
<br /> aqujfe coma site investigations is with frltrsti,on us documented YdroRhobjc
<br /> m• !n fact, to rRinant flow Paths rather than Chandler, 99 (Danielssr„i f
<br /> than I'll screen to many cases, able •Hora Problems
<br /> hazardous w n9ths(e. Plume entire rrtethad of witz et al. 7992 Laxen and
<br /> rite sites g•' 3-6 ihrckRess can be the re rectiryi the al" 1 i )make this an undes,
<br /> aver time S to date m)typically instailed a Less Trioval of potential �'proble
<br /> It-
<br /> s€�ewrr to be sites
<br /> differences monitor Particle's dunn �`mobile m. and jnciude
<br /> Pitt, move cQnrentratio g flltratjon, thus arttfic,lf�minant associated)
<br /> smatterrtarrt ar7d t have jricreasin rnent ns love. dam
<br /> djameter wells tier,is 91Y been often be mit, juin Y biasing conte
<br /> $rid shorter sial,rand taws techniques. gated by usin ng-induced turbidity mjnant
<br /> Greens. ro' ques. 9 jow.8ow Purging '�`Problems can
<br /> particles irthe subshyd,urface gnifi g ng and sarriplfng
<br /> just severai si ,;orient
<br /> Years ace systems has cancs of colloidal-size gone Conside subsurfape can
<br /> and za (Gschwend s men ds "Zed during and increased considerable refine Ceptual models
<br /> This reaa` 7989; 'uls $ 'eYnolds t g the use of a7ent due to have under-
<br /> iedf. resulted , 799,7 Ryan and ' 3B7' 14fcCa hydraulic aRroJs
<br /> that showed Push tecttnptoQld serearti me reran,develo
<br /> faster cont, .M both field iaschwend, 199,7}.Y pies(e n9 tools. j3mert#
<br /> distances and at h minant m . and laborafo scree QED Niro 'g., Cone Bene, _call
<br /> Port modet higher concentrat' Oder greater studjes design Visite haract,rjz���hjei�a�e raja,�star,
<br /> ,368; Ared,ctians would su ions than trove and astern all a monjto ti can then bey fast
<br /> Lnrlaid and s 9gest(Budde trans- atives used fa
<br /> Such models sngtsson, 19a8•l ento&e meter and Hunt, considered for rove ht+)rral rriprrgto Well network
<br /> S. lnd,e s
<br /> tsAlcaij et al, gg desi
<br /> mobile aqueous Y immobile for interaction 79 f design of an gaols is o beg
<br /> for a and immobile solid between the Y monitariri dro g sefiin ere
<br /> mobile reactive solid Phases an' r7+'a#e s+te c g sYs#ant should h9s. The ultimo,
<br /> Phaseng
<br /> Possible but do not at established 4wacterization and °''waver be based
<br /> as a phase. it is re tow
<br /> brought increasi means of CO'ntaminaC°gnlilon of this third manrtonng objactjves. Cr=risistent with
<br /> are collected and attent'r'n tO t nt transport that has
<br /> McCarth Processed for al Nalysi iter In e, hicjt 8 if thea sarn
<br /> Y and Degueldre, lysis(puts assessment assessment of the Rlipg program objective.,
<br /> EPA, 199'5). jgsucjt 9993 magnitude fective.,include
<br /> Backhus et al'' 1990; ft"ion and a accurate
<br /> Ct.r'rta
<br /> Possesses high so a mss,Js ra e't! e#al. 7993, U• subse Quer time extent of subsurface
<br /> i remains stable i rBtjvn reactivi n sufficient m,"'s S' regarding
<br /> pl remedial perf aria rate�nme
<br /> n sus ryla r 9 Plume
<br /> +tzecjtanism to f Pension, it can large surface area and deji�,tori in ce,then nt�►f
<br /> of subsurf acijittate area, ne�fi,janiar three $Oma information
<br /> ace systems contarragnant tra as an jrttportant installation. This,an OrOg V11 -dtm,nsionaj space
<br /> rlVal gn differ be accom turods designis
<br /> many typ sS ani t plished and
<br /> Dalcef are gsrs tocols and equipment with a variety of
<br /> that the surface free enaertlrlex fit r+gs• Detailed
<br /> tools ranging from hand-p
<br /> free ane rgY of the am sufficlentf etajjed information �enijoned Berated
<br /> with diame yrs beicaj Particle da y small so direcVon, ari,�It O ground_ eve and j
<br /> lY in ground ininat,s the bas data re horizontal and ved. water flow vele drllting
<br /> observed Mobile water, bulk are re quirernents. 'tel varial�ilit ty
<br /> 3 rvus i ,ween 1 and ()0()
<br /> 0 n Tien trdas particle quired priori Detailed Y are essentiaf
<br /> jt Particles Include, most cant Paints. T and during soil and
<br /> and parts to luminum,and secondary Ga r+tonjY firs iris 9 the insta 1,lan geologic data
<br /> m9artese Y minerals; gaob9ic jogs Which fristcrrcet as well as of sampling
<br /> organic ma#silos, and oxides,dissolved as d8tai
<br /> viruses The use of bo accumulate during the site inveSOO
<br /> st arm
<br /> bacteria. chars With this ainformat"
<br /> and mended. RhYsjc al techniques is investigation.
<br /> Merizatton data ion(together also recom.,
<br /> and a clear under t with site
<br /> 9 of sampling
<br /> 2
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