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FROM URSG W-G SANTR BARBARA 60S "364 0259 1999. 11-23 16 17 #380 P 02/14 A Discrete Point-193teffal Sampling Device Thanim W. Kabis SiBAK industries Ur ited, Inc- Lu Vegas,Nevada 'Wr -2j, -T AbWMce gradient txa= tests (Moitz ez ail., 1986), plume deiintation (Molaos a ai.. 1994), and idestti£casion Relative to standard ground%«ter monitoring of elastin= zones of tntcrobial activity and vertical wells, dis==point-inter%•al samplers Prtn"Ide supenor chemical gradients tuition an aquifer (Snuth et aL. data for dW=-drmensional Yepresentauan of 1991). A summary of Findings in these and oilier contamtiiant plumes. This approach often enables publications includes; evaluation of in .ntu attenuation of contaminant plumes. A =v discrete point-tnterc'ai graundti��ater a Dtsc:gte paint-�ntett'al monitoring of ground- ssitepler has been developed for multi-level sampling nater i;ualrnr >$ costt'ectr.'e relative to nested or =der a +crude range of monitoring conditions and clustered waits. manrtonng strategies. The sampling dent= tCcerttlY o patented in the United States* is designed to e=ct Desi to point-interval grourtct�iater sampling ies with tatntmal disturbance from discprovides greater preciston in evaluating the �4; =trationsling zones. The design and smallsize of the vertical disthbuuon and range of eontammantsampling �zrx enables rapid deplo}'ment and conrelative to verueil]v-integrated decantarminauon under the most rigorous of field samples obtained from wells %vhtch partially- or eondruons. The ease and rapidity of decontamination fullv-pW=ie a given aquifer (Patton and Strath. for this sampling device rzmoves the necessity for 1988. Robins and Martin-Hayden. 1991). single-well dedication. This paper describes design. performance capabilities. and Feld uminsg of the o GrounChAata quality data deMled from discrete discrete potnt-internal sampling device knit as the point-fin=al samplers (DAIS) provide a sound KABIS Sampler. basis to delineate REDOX boundanes and to evaluate chcrtucai and microbial processes to am Introducuon aquifer(Smith et al.. 199I). Tire importance of closely-spaced. discrete o Discrete point-interval monitoring of forxd- iatervW grourgh ester sampling has beers demonstrated gradient tracer tests enables development of a in the literature Cor nmnitonng of aqueous-phase onal pumre of hydraulic conduc- contatmrrants at hazardous wane sitar and during fold Rutty(Molt et al.. 1988) eq�znu=ts. Data obtained from dis=ctc-int %l sampling dcnces provide a more compiete_ o Drs=m point4ittenral mOTULDrrng provides an itprescaunon of the horcumial and vertu:al cdm of a a,=2-0. detcrunnauon of the anal conu=nM plume relative to single-screen wells with dz nbuuon of ptezometne head within an aquifer long sampling zones. The advantages and (Patton and Smith. 1988)- . pwforman= charactc=cs of discrae point-interval gonndnater sampling are explored from a mneept=l The fiat the= findings are paru:rnlariy (Patina and Smith. 19SS), theoretical (Robbins and important in view of the sheer number of hazardous jjftpn-Hayden. I99I). and crpertmental basis Baste sites under regulatory supervisron in the United 'Wimples of�-Perimental application include natural- States. partrcularl) underground storage tank (UST) gradient tracer tests (MacKm et at.. 1986). forted- sites. A management stsatca current!} garsung