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MAR-24-g9 16 46 From ti000tiAR0 CLYDE ¢ T-735 P 20/34 Job-462 the various chambers analyzed for whatever constituents have been equdibmtcd into the chamber Studies conducted in Israel and several European countries using the DMLS system have shown that reliable DPIS samples are aehievablo without benefit of purging Widdovmn and Orn® demonstrated in their 1995 paper that motals and organic constituents could be successfully modeled in an aquifer in three dimensions There is a single obvious drawback to the DMLS sampler, however. expressed by the extraordinary amount of trine necessary for equilibration 0 of the sample cells and tho weals water across the semi-permeablo membrane In situations where oxpodioncy is required,this sampler may not be a correct choice canctuZiono Obtaining representative groundwater sampias, without benefit of well purging, from most groundwater monitoring wells using newly designad sampling equipment is now possible A rayless of current published and unpublished literature has rovealed a new, growing, and viable trend in the groundwater investigation industry Owing to the most recent move in both government and the pnvrate sector to spend less on environmental clo an-up activities, and since the act of purging is, in and of itself a vary costly onterprise, the no-purge scenario is gaining aide acceptance Recont studies conducted at sites in several states have all reached the same conclusion, that purging a groundwater monitoring well when using a sampling instrument capable of obtaining depth-discrete samples is unnecessary in order to obtain a representetwo sample 53a57c7: tact 9mfth Thomas Wayne„ Kabis is Virg President of Research & Devalopmera and Director of Operations for SIBAK Industries Limited, Inc, of Las Vegas, Nevada He has more than 22 years of experience in performing geologic and hydrogeologic mvostiga lions, R-1 atream-reach and hydrological surveys. geochemical and geophysical surveys, hazardous waste remedial investigations, feasibility studies, and has conducted remediation designs and installations Mr Kabis is a contributing author to books covering topics on standard operating procedures for LUST invostigations, and PHASE-1 Site Assessment procedures and protocols, His most recent work has invoked the Investigation of representative sampling ochomos for the delineation of environmental contaminant plumes. He is the author of a new WIN95 32-bit RBCA computor program (ReBeCcA) and holds patents to that KABIS SampierT 4, the SVPET'rm Vapor Testing System, the Model 8604 PBDS Groundviater Scrubbing Systom, and othor onvironmantal remediation and testing devices �® L[D-VCC �a�o� 0 • MAIM 4 22 PM 5 of 10