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MAR-24-99 16 49 Frum WOODWARD CLYDE ¢ T-T35 P 2z/34 Job-462 4 v........... SIMON Wells wighM Basing Thomas Wayne., Kabir, Vice Presidont of Ftvsearah and Development S113AK Industries Limited, Inc 1520 J Industrial Avenue Escondido,California(92020) MEMORDS No Purge.True Data,Accurate Data MORA 7 Rocently, a protocol has bean developed that allows accurate discrete palm-interval sampling (DPIS) without the nood for well purging This protocol is adaptable to ground-water monitoring well sampling where contaminants are present, and to enbodies of well, such as sampling lakes, be rivers, streams and bays Where petroleum product is present on the aquifer surface Simple, safe and accurate vertical DPIS profiling of any ground-water monitoring well or other body of vaster is now possible even through free 4loating product This protocol, in combination with an innovative neva sampling devico, provides regulators and contractors with the assurance that they can finally,accurately delineate the full vertical and team Is a honzontea distnbution of a contaminant plume A eroli nnes detailspity to this of this new protocol and hnology the spedice ons of documented aims savings in sampling costs This pap a new=mpling device 1WRIMOU0700M Obtaining truly representative groundwater sampiGs,which have low turbidity,and minimal volatile organic compound (VOC) loss has been, until now, a sampling dilemma Current practice requires groundwater ancitoring g lwelis to be n fresh, purged,drawing out three (3) to five (5) well volumes of the"stagnant' (standing) g devices ese can only feather a"water mixed t olumn"sample fior to rom grounidwaterr wnlcn Is"e This is done static(resident),above se thelwell *mien en d®vices can a Y 9 interval (that part of the well casing which is slotted), and unavailable to refreshment by flow teither hrough the screened interval of the well (13) The purge0 groundwater, contaminated with toxic che ,tmust be facility disposed of in an appropriate landfill,or treated at a temporary storage and disposal (TSD)pemo ed Dri3crg?+a poiiit4 lrt2orviar Sarinpllrog The importance of closely-spaced, discrete interval ground-water sampling has been demonstrated sn the literature . Data (23) for monitoring of aqueous-phase contaminants at hazardous waste sites and sentatron of the uring field rtmen s and obtained from discrete point-interval sampling devices provide a more complete rep y®r4ical extent of a coritmrriinant plume relative to single-screen wells with long sampling"nes The advantages and ual red from pertam�ince charactanstics of discrete basis Examples olf experimentalgroundwater applicationtiuare de natural-gradient tratcer (tests theoretical (18), and experimental (7), forced-gradient tracer tests (8), plunge delineation (11), and identification of discrete zones of microbial activity and vortical chamical gradients within an aquifer(22). 64 Now leis Uea P11ag DaviW Anew discrete point-interval sampling ( } DPIS device was designed to solva as marry of those sampling problems as decontaminate The r can be possible It has no moving parts, and >s ,extremely simple to operate and is capable of sampling ng aIeany depth lowered past floating product without affecting the integrity of the sample, below or above the screened interval of any well, making purging of the well unnecessary Since the DPIS device samples; directly Into the mcpcontainer flow), loss of volatile fractions within a d 5 j minimized The hydradynashaP PS sampler creates a minimal amount of hydrodynamic dispersion of • 30AI"4 22 PM tof8