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... ........ Filtration tea should be dictated nY 1) General Considerations De sic to filter sample a fix for poor samp 9 uirerr1ents for ground-water nstituents should not tin objectlVes rather then certain co There are no unusualloifiow rri'snimal dra,Mdawn samp 9 given as to what the when using Practices,and field-filtering rn 1ish. For sampling devices the default. Gansideration shtiuldoba p operationally techniques. The malar concern is that the device give p as opposed to Clearly, application of field-fsitdr�#so}diis ssolved g m f+ttgej) ncen_ flow rates(i.e-,4 0.5 Limin}. m filters are consistent results and minimal disturbance of townan one well assesamente f samples filtered with fl 45 P across a range of to dissolved Ii etals,0.1 F used for pumping malt rates that cause minimal to no drawd the trations of malar ions and trace m In this sense. h 0.45 µm filters must lea be could easily cause significant drawdown+n another well recommended all samples temperature mast regulatory Programs.plycalinIcinate is sus- 'd in a lass transmissive fo fes ul or temp le over a articulate calcium carbonate titration pump should not cause undue p on the water samp filtered if$19" material Q to imp sitlon disturbance in operation is alter the GOZ CAmP� changes or physical fln range. Consistency Petted,since tfi flm aiili likely reasonable Sampling and prec'isian goals. ,,suits(althoughaffect the results). of the sample and,therefore, filtration of a rrittcat to meet accuracy es of Sampling Devices be aperapriate, plihougfi filtration may changes to occur 2) Advantages and Disadvantag number of unintended chanfititatiges Sample may cause a ossibly leading Of sarnpling devices are available for incow-lude lis and uncertainty in the resuits. to A varlety i lne or sampling and include (e 13 axidation, sampan)F le analY es may be unavoidable.but flaw{rriinimai drawdown}p electrical submersible artifacts during changes nized. Deleteous per pumps,bladder p some of these unintended t m must be rscog Pumps- Devices which lend them- �n$is#ent aQFli�tian of certain pumps,and gas-driven p P ' :stent operation at defin- the factors leading uidelines. Guidelines should address selection of referred. itis desirable that the pump effects can b3+"r"i4n+rtized by selves#o both dedication and corms at these lower flow filtration g re size,etc.in order to identify and able tow-flow rates ase preferred. rel'" licotians filter type,media,Po when filtering be easily adjustable and op eristaltic pump is limited meet o o¢P� minimize potential sources of uncertain rates.The P assing resulting um s should samples. vides and can cause d me valatites loss- Gas to be i pumps F alkalinity,and so In-line filtration is recornmended because it Qm as to be in direct contact a handling.and be of a type that does not allow the 9 through less sampl here. In-tine filters with the sampled fluid. better consistency sure to the atmosphere and non, iers are ill- le expo barrel filters) rob type samplers minimizes to In osable vtili cause repeated are available in both dir fiat membrane o+lsabl formats Cleariy,bailers and other 9 �b1e Din-1'sne filter holder, Disp tin since they disposable 0 1 5 4 PM). suited for low-flow sampling gtagnant water in the casingri�use and various fitter pore S1z ( of g{eater sediment handl+n9 disturbance and mixing mouse too mUc cartridges have the advantage the dynamic samplers may Capacity when compared to'traditionalamufacbtu eesl a°m` narnic water in the screened interval.Simi ar , Dint of sampling• Use of the bledevjCeS Filters must be p,,-rinsed Following of inertial lift foot-valve type disturbance at the p mendations. if there are no recommendation has begun,a pass through a minimum of Oncerfi trat+d ater fallowing else tends to introduce uncontrolled and unacceF tin re size operator variability of in and prior to S' g larger than the pa es and disadvantagesPurging develop as particles [is that the st ai. (1991), filter cake may Summaries of advantages i994) devices are listed in Herzog ad{ accumulate on the t�f afthabmembrane is reThe resuil d�zc�dd�from various sampling parker{1994)and Thum effective pare die ore size a re EPA(1992), acuses Inc prefiltering U.S. articles smaller than the state P article loads to P the filtrate. Possible corrective P E. PumP Installation able (with larger pore size fitters), reducing sample volume, devices{left in the yell}cap Dedicated samplingae peters over�r [other type of begin with, and of pumping and Sampling a f Water Level and Water Quality actable sarr+pling device should be slowly and G. Monitoring device- Anij lowered betaw ti7e top of a 3 m Indlsator parameters carefully to the middle of the screened'interval tenant to monitor drawdown tl above the middle 03.13•,1-1'13 m of the stag sligh Y sive mixing sate adjustment. The goal is screen with the screened Check water Level pDal Ma be screen). This is to rriin'srriize excel pension of solids guide to flow rate gpurging. This g above the sc in the well as a 9 44.1 m)during P r9 geologic water+n the casing and to minimize resusprequire interval Zang water, m'snimal drawdown{ affect the difficult to achieve under some circumstances due will have collected at the bottom of the well. These two which n to directly nce effects have been show ars,to be a direct sed on site-specific conditions and personal heteeOganeitlas within the screened lntesyal,an may disturbs There also apFe adjustment ba indicator parameters gUauid required for purging' able sampling devices Tel adj The water qualm time sen size of p experience. to fine water quality correlation betty purge a volumes and times•The be con finuously monitored during purging. to the weft bore and resulting p 9 ke is#v minimize disturbance of water and solids in the we Y casing• 7 1