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EPAS APPROACH TO VAdOSE ZONE MONITORING AT RCRA FACILITIES

GROUNd WATER MONITORING ANd REMEdIATION 1993年第1期13卷 151-158页

作者： dURANT, Nd MYERS, VB ECCLES, LA Washington D.C. 20460) has worked as an environmental scientist in the RCRA corrective action program at EPA since 1989. After graduating from Colgate University in 1987 Durant worked for GeoTrans Inc. conducting hydrogeologic investigations at numerous waste disposal sites throughout the northeastern United States. At present Durant is pursuing an M.S. degree in environmental science from The Johns Hopkins University. His research is focused on enhancing in situ biodegradation of aromatic organic compounds in the subsurface. Washington D. C. 20460) graduated from The Johns Hopkins University in 1972 with a B.A. degree in natural sciences. Myers received a Ph.D. in oceanography from Florida State University in 1977. During 1978 he held a post doctoral fellowship at University of Florida in the Department of Environmental Engineering and Science. From 1979 to 1983 Myers was employed by the Florida Department of Environmental Regulation where he worked on environmental restoration projects. Since 1984 Myers has worked at EPA managing RCRA ground water monitoring and corrective action programs. Lawrence A. Eccles (U.S. Environmental Protection Agency Environmental Monitoring Systems Laboratory P.O. Box 93478 Las Vegas NV 89193–3478) is a hydrologist with the EPA Environmental Monitoring Systems Research Laboratory in Las Vegas Nevada. Eccles is responsible for the development of vadose zone and in situ monitoring techniques and guidelines. After graduating from Monmouth College with a B.S. degree in chemistry Eccles performed graduate work in chemical engineering at New Mexico State University. He received formal training in hydrology in 1969 from the U.S. Geological Survey in Denver and worked with that agency before joining EPA at Las Vegas in 1984. One of his co-authored articles was chosen for the Best Paper Award by the journal Ground Water in 1975 and another was the subject of a cover story for Water Well Journal in 1977.

The U.S. Environmental Protection Agency (EPA) recently proposed to amend federal regulations to require vadose zone monitoring at certain hazardous waste facilities. To support this proposal, EPA evaluated previous policy on vadose zone monitoring and examined advances in vadose zone monitoring technology. Changes in EPA vadose zone monitoring policy were driven by demonstrated advances in the available monitoring technology and improvements in understanding of vadose zone processes. When used under the appropriate conditions, currently available direct and indirect monitoring methods can effectively detect contamination that may leak from hazardous waste facilities into the vadose zone. direct techniques examined include soil-core monitoring and soil-pore liquid monitoring. Indirect techniques examined include soil-gas monitoring, neutron moderation, complex resistivity, ground-penetrating radar, and electrical resistivity. Properly designed vadose zone monitoring networks can act as a complement to saturated zone monitoring networks at numerous hazardous waste facilities. At certain facilities, particularly those in arid climates where the saturated zone is relatively deep, effective vadose zone monitoring may allow a reduction in the scope of saturated zone monitoring programs.

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APPLICATION OF ELECTROMAGNETIC LOGGING TO CONTAMINATION INVESTIGATIONS IN GLACIAL SANd-ANd-GRAVEL AQUIFERS

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GROUNd WATER MONITORING ANd REMEdIATION 1993年第3期13卷 129-138页

作者： WILLIAMS, JH LAphAM, WW BARRINGER, TH John H. Williams received an M.S. in geology from Penn State University in 1980 and has worked for the U.S. Geological Survey since that time. He currently is the ground water specialist for the New York District (P.O. Box 1669 Albany NY 12201) and the borehole geophysics specialist for the Northeastern Region. He is also an instructor for the National Ground Water Association course on aquifer test methods. His primary interest is the application of borehole geophysics to ground water studies. Wayne W. Lapham has been employed as a hydrologist with the U.S. Geological Survey since 1976. He currently works for USGS as a ground water specialist for the National Water-Quality Assessment Program (MS 413 Reston VA 22092). He received a B.S. degree in mechanical engineering from Northeastern University in 1969 an M.S. in geology from the University of Massachusetts in 1975 and a Ph.D. in hydrology from the University of Arizona in 1988. He has been involved with various aspects of ground water hydrology including resource appraisal and ground water modeling. Thomas H. Barringer is the statistical methods specialist for the New Jersey District of the U.S. Geological Survey (810 Bear Tavern Rd West Trenton NJ 08628). His interests include spatial statistics and the application of statistical methods to hydrological problems. He has a joint M.S. in regional planning and regional science and a PhD. in regional science from the University of Pennsylvania.

Electromagnetic (EM) logging provides an efficient method for high-resolution, vertical delineation of electrically conductive contamination in glacial sand-and-gravel aquifers. EM, gamma, and lithologic logs and specific conductance data from sand-and-gravel aquifers at five sites in the northeastern United States were analyzed to define the relation of EM conductivity to aquifer lithology and water quality. Municipal waste disposal, septic waste discharge, or highway deicing salt application at these sites has caused contaminant plumes in which the dissolved solids concentration and specific conductance of ground water exceed background levels by as much as 10 to 20 times. The major hydrogeologic factors that affected EM log response at the five sites were the dissolved solids concentration of the ground water and the silt and clay content in the aquifer. EM conductivity of sand and gravel with uncontaminated water ranged from less than 5 to about 10 millisiemens per meter (mS/m);that of silt and clay zones ranged from about 15 to 45 mS/m;and that of the more highly contaminated zones in sand and gravel ranged from about 10 to more than 80 mS/m. Specific conductance of water samples from screened intervals in sand and gravel at selected monitoring well installations was significantly correlated with EM conductivity. EM logging can be used in glacial sand-and-gravel aquifer investigations to (1) determine optimum depths for the placement of monitoring well screens;(2) provide a nearly continuous vertical profile of specific conductance to complement depth-specific water quality samples;and (3) identify temporal changes in water quality through sequential logging. detailed lithologic or gamma logs, preferably both, need to be collected along with the EM logs to define zones in which elevated EM conductivity is caused by the presence of silt and clay beds rather than contamination.

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FAST FET ANd HEMT SOLVERS FOR MICROWAVE CAd

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INTERNATIONAL JOURNAL OF MICROWAVE ANd MILLIMETER-WAVE COMPUTER-AIdEd engineering 1993年第1期3卷 37-60页

作者： LAdBROOKE, ph HILL, AJ BRIdGE, JP GaAs Code Ltd. St. John's Innovation Centre Cowley Road Cambridge CB4 4WS England Peter Ladbrooke obtained his doctorate for work on non-uniformities in Gunn and Schottky GaAs diodes from Cambridge Unviersity in 1970. From 1970--1973 he was a Senior Research Fellow in the British Civil Service. In 1974 he moved to the University of New South Wales Australia Department of Solid-state Electronics. During 1982 and 1983 he was Visiting Scientist at Cornell University Ithaca New York USA. In 1984 he became Technical Manager and Chief Physicist at the Compound Semiconductor Laboratory GEC Hirst Research Centre. where he worked until 1988 when GaAs Code Ltd. was formed. Adrian Hill graduated from the University of Natal Durban South Africa in 1980 and then obtained an M.Sc. He was seconded to GEC Hirst Research Centre from 1983-1986 to work for his Ph.D. “An Analytical Model for High Electron Mobility Transistors.” During 1987 he was an Assistant Research Fellow at the University of Natal. From 1987-1988 he was employed as Senior Research Scientist Device Physics Group. GEC Hirst Research Centre. In 1988 he moved to GaAs Code Ltd. (Photo not available at this time.) James Bridge graduated from Oxford University in 1982 with first class honours in Engineering Science having been awarded the Stansby Prize for best Maths. or Science degree at Lincoln College and the IEE Prize for best Electrical or Electronics degree in the University. He started with GEC Hirst Research centre in 1982 as a Research Scientist and Project Leader and worked there until 1986 when he joined Analytic Associates Ltd. as a physicist. In 1987 he left to begin work which led to the founding of GaAs Code Ltd.

Methods are discussed for forecasting, in a few seconds on a personal computer with a 486 processor, equivalent circuits and S-parameters of a GaAs FET from a physical specification. By inverting the algorithms, similarly fast simulators can be devised to fit equivalent circuits to measured S-parameters, in the process yielding information on the FET's material and structural dimensions. The practical value of such simulators is illustrated by FETs designed and implemented to have a noise figure and associated gain at 12 GHz comparable with commercial pseudomorphic HEMTs.

关键词： Field effect transistors

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Vulcanization influence on TSd currents and wettability of room temperature vulcanized silicone rubber hv insulator coatings

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European Transactions on Electrical Power 1993年第5期3卷 367-373页

作者： Gubanski, S.M. Wang, M.‐S.E. Dr. Stanislaw Gubanski (1950) received his M.Sc. (High-Voltage Engineering) and Ph.D. (Materials Science) degrees from the Technical University of Wroclaw/Poland in 1973 and 1976 respectively. He has worked as a research fellow at the University College of North Wales at Bangor/UK and then as a senior lecturer at the Technical University of Wroclaw/Poland. In the meantime he spent two years at the Federal University of Technology Bauchi/Nigeria and also worked as a guest researcher at the Chalmers University of Technology Göteborg/Sweden. At present he is Associate Professor at the Department of Electrical Plant Engineering of Royal Institute of Technology at Stockholm/Sweden. His major field of interest includes aging processes in electrical insulation and their diagnostics. (Royal Institute of Technology Department of Electrical Plant Engineering S-10044 Stockholm/Sweden T +468/790 7775 Fax +468/2052 68) Dr. Min-Sheng Edward Wang (1964) is agraduate of Xi'an Jiaotong University/China (B.Sc 1984. M.Eng. 1987 D.Eng. 1991) in Electricai Engineering. He worked as a research engineer in the National Key Laboratory of Electrical Insulation in China from 1987 to 1991 and also as a guest researcher at the Electrical Power Research Centre at the Royal Institute of Technology at Stockholm/Sweden 1991 to 1992. He is currently a post-doc research fellow involved in the field of conducting polymers at the Institute Physics and Chemistry of Silo Carlos University of São Paulo/Brazil. His research interests mainly focus on the influences of structure and morphology on the electrical properties of polymeric dielectrics. (University of São Paulo Instititue of Physics and Chemistry Dept. of Physics and Materials Science Av. Dr. Carlos Botelho 1465 BR-13560 São Paulo/Brazil T +551 62/71 53 65 Fax +551 62/71 36 16)

Thermally Stimulated depolarization (TSd) current spectra and surface wettabilities, represented by contact angles, i. e. the advancing angle and the receding angle, were measured on two types of high voltage room temperature vulcanized silicone rubber coatings during their vulcanization processes at room (25°C, 80 % RH) and elevated (70°C, 80 % RH) temperatures. Results show increases in the material hydrophobi‐cities with the vulcanization degree until their stabilized values are reached. Compared with the room temperature vulcanization, the elevated temperature speeds up stabilization processes of the contact angles and of the TSd spectra. Variations of the contact angle seem to be closely related with changes of the TSd peaks. In most of the cases, the contact‐angle increase is accompanied by either the TSd peak‐height decrease or the peak‐temperature increase. Copyright © 1993 John Wiley & Sons, Ltd.

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COMPARISON OF STAINLESS-STEEL VS PTFE MINIWELLS FOR MONITORING HALOGENATEd ORGANIC SOLUTE TRANSPORT

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GROUNd WATER MONITORING ANd REMEdIATION 1992年第4期12卷 126-131页

作者： BIANCHIMOSQUERA, GC MACKAY, dM Gino Bianchi-Mosquera (51 Claremont Ave. Long Beach CA 90803) is a project geochemist with Watkins-Johnson Environmental Inc. He received a B.A. degree in geochemistry from Occidental College Los Angeles California an M.S. degree in geochemistry from The Pennsylvania State University and a D.Env. degree from the University of California Los Angeles in 1982 1986 and 1992 respectively. His research interests include the transport and fate of organic compounds in the subsurface and in the evaluation of new aquifer cleanup techniques. Douglas Mackay is adjunct professor in the Centre for Groundwater Research at the University of Waterloo (Waterloo Ontario N2L3G1) Canada and a visiting scientist at the UCLA Department of Civil Engineering. From 1986 to mid-1990 he was a faculty member in the Environmental Science and Engineering Program of the UCLA School of Public Health. His research focuses on field studies of transport and fate of organic chemicals in ground water and ground water decontamination technologies. Dr. Mackay received a B.S. in engineering and M.S. and Ph.D. degrees in civil engineering from Stanford University in 1970 1973 and 1981 respectively.

Field tests of organic solute transport behavior have often been monitored using small-diameter wells (miniwells). To determine if experimental results could be significantly biased by sorption to, desorption from, or diffusion through sampling lines, dissolved concentrations of tetrachloroethene and carbon tetrachloride were measured in ground water samples collected simultaneously from the same spatial location during a forced-gradient test in the Borden aquifer using polytetrafluoroethene (PTFE) and stainless steel miniwells (1/8-inch O.d.). A semiautomated organic analytical system was used on-site to obtain real-time results, which avoided sample holding problems and permitted optimizing sampling times. The breakthrough curves (plots of concentration vs. time) for both organic compounds indicate that under the conditions of this experiment (low organic solute concentrations, short exposure time of sampling lines to the plume. adequate flushing of sampling lines) there is no significant difference between concentration histories (breakthrough curves) collected using a polytetrafluoroethene sampling line and those collected using a stainless steel sampling line. This suggests that organic solute tailing seen in this and also in a similar transport experiment previously conducted at the site is the result of transport processes in the aquifer rather than an artifact introduced by the PTFE miniwells.

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STRUCTURAL RELIABILITY ASSESSMENT WITH AMBIGUITY ANd VAGUENESS IN FAILURE

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NAVAL ENGINEERS JOURNAL 1992年第3期104卷 21-35页

作者： AYYUB, BM LAI, KL Bilal M. Ayyub:is currently an associate professor of civil engineering at the University of Maryland (College Park). He completed his B.S. degree in civil engineering in 1980 and completed both his M.S. (1981) and Ph.D. (1983) in civil engineering at the Georgia Institute of Technology. Dr. Ayyub has an extensive background in risk-based analysis and design simulation and construction engineering. He is engaged in research work involving structural reliability bridges marine structures and mathematical modeling using the theories of probability statistics and fuzzy sets. He has completed several research projects that were funded by the National Science Foundation the U.S. Coast Guard the U.S. Navy the Department of Defense the Maryland State Highway Administration the American Society of Mechanical Engineers and several engineering companies and other governmental agencies. Dr. Ayyub is a member of ASNE the American Society of Civil Engineers (ASCE) the American Concrete Institute (ACI) the American Society of Mechanical Engineers (ASME) the Society of Naval Architects and Marine Engineers (SNAME) the North American Fuzzy Information Processing Society (NAFIPS) the Committee on Reliability of offshore structures of ASCE and the Committee on Structural Safety of ACI. He is the author of about 150 publications in national and international journals conference proceedings and reports. Dr. Ayyub received the ASNE “Jimmie” Hamilton Award for 1985 the ASCE “Outstanding Research Oriented Paper” in the Journal of Water Resources Planning and Management for 1987 and the Edmund Friedman Award from ASCE in 1989. Kwan-Ling Lai:is currently a Ph.D. candidate of reliability engineering at the University of Maryland (College Park). She received her B.S. degree in civil engineering from National Taiwan University in 1986 and M.S. degree in civil engineering from the University of Maryland in 1989. Ms. Lai is a student member of the American Concrete Institute (ACI). She is engaged in the research work in

engineering projects and designs are commonly developed in a systems framework that includes different types of uncertainty. In general, uncertainty can be of either the ambiguity or vagueness type. The theory of probability and statistics has been extensively used in engineering to deal with the ambiguity type of uncertainty. The theory of fuzzy sets and systems has been used to model the vagueness type of uncertainty in many engineering applications. In this paper, the role of fuzzy sets in engineering systems is described using a selected example area that deals with vagueness in failure definition as used in solving structural reliability problems. The reliability of a structure is commonly based on an explicit definition of failure, making structural reliability dependent on this definition. The vagueness in the perception of damage and failure introduces another class of uncertainty, in addition to the commonly realized and modeled class of uncertainty, i.e., ambiguity. In this study, a methodology for reliability assessment of structures based on a fuzzy definition of failure is developed. The significance of the contribution is in providing the reliability of the structure over a damage spectrum.

关键词： Failure Analysis

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THE NPS AUV-II AUTONOMOUS UNdERWATER VEHICLE TESTBEd - dESIGN ANd EXPERIMENTAL-VERIFICATION

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NAVAL ENGINEERS JOURNAL 1992年第3期104卷 191-202页

作者： HEALEY, AJ GOOd, MR Dr. Anthony J. Healey:was graduated from London and Sheffield Universities with the degrees B.Sc.(Eng.j and Ph.D. in mechanical engineering in 1961 and 1966 respectively. He emigrated to the U.S. in 1966 and has taught at The Pennsylvania State University MIT The University of Texas at Austin and the Naval Postgraduate School. He was promoted to full professor of mechanical engineering in 1974 at the University of Texas at Austin and in 1981 he joined Brown and Root Inc. as manager of the Pipeline and Sub-Sea Technology Research Group. In 1986 he assumed his present position as professor and chairman of mechanical engineering at the U.S. Naval Postgraduate School. His areas of specialty include mechanical system dynamics vibration and control systems and he is presently the leader of an Interdisciplinary Project in Mission Planning Navigation and Control for Autonomous Underwater Vehicles at NPS. Lt. Michael R. Good:is an engineering duty officer assigned to Puget Sound Naval Shipyard. He graduated from Marquette University in 1983 with a B.S. degree in mechanical engineering. He has served on the USS Jack Williams (FFG-24) as ordnance officer and damage control assistant. He obtained the master of science in mechanical engineering degree from the Naval Postgraduate School in 1989 during which time he was the chairman of the Monterey Peninsula Section of ASNE. He is currently assigned as senior ship superintendent and docking officer.

The design, construction and testing of an autonomous underwater vehicle (AUV) for use as a research and development testbed at the Naval Postgraduate School (NPS) is presented. design objectives, analysis and trade-offs are discussed with respect to a generic AUV with specific details for the case of the NPS AUV II. System integration and flexibility are emphasized in the subject vehicle to support presently planned and future research employment. Hull, mobility, sensors, automatic control, and energy subsystems are described. design and fabrication techniques for the NPS AUV II vehicle hull and equipment are documented. Some results from an experimental program illustrating verification of vehicle design are described.

关键词： Submersibles

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The Right to die: State Courts Lead where Legislatures Fear to Tread

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Law & Policy 1992年第4期14卷 337-380页

作者： HOEFLER, JAMES M. KAMOIE, BRIAN E. **James M. Hoefler is Assistant Professor of Political Science and Coordinator for the Policy Studies Program at Dickinson College in Carlisle Pennsylvania. He holds a B.S. in mechanical engineering from Syracuse University and the M.A. and Ph.D. in political science from the State University of New York at Buffalo. His research and teaching interests focus on domestic public policy state politics and public administration especially in the areas of job training health care and the right to die. ***Brian E. Kamoie holds a B.A. degree in Policy and Management Studies from Dickinson College in Carlisle Pennsylvania. He maintains an ongoing interest in public policy regarding health care education and foreign affairs and has worked directly with these issues through positions with the Pennsylvania State Senate and the London Embassy of the U.S. Department of State. Mr. Kamoie is currently pursuing a law degree at George Washington University in preparation for a career in the public service.

The right to die may be among the most legally complex and culturally sensitive areas of civil rights to emerge in our time. The thorny issues associated with a terminally ill individual's right to self‐determination, and the disposition of individuals who are incompetent to make right to die decisions for themselves, promises to keep all parties involved ‐ health care professionals, medical ethicists, families, lawyers, judges, and state legislators ‐busy for some time to come. To this point, the state courts have taken the lead in the right to die debate, while the state legislatures have tended to drag their collective feet. This article lays the case law groundwork for right to die decision making, then goes on to assay the legislative responses to the issue that have been rendered in the fifty states. Copyright © 1992, Wiley Blackwell. All rights reserved

关键词： death and Euthanasia Legal Approach Medicaid

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REdUCTION OF NITRATE LOAdINGS TO GROUNd-WATER

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GROUNd WATER MONITORING ANd REMEdIATION 1991年第1期11卷 112-118页

作者： SHIRMOHAMMAdI, A MAGETTE, WL SHOEMAKER, LL 1 Adel Shirmohammadi is assistant professor of Agricultural Engineering at the University of Maryland College Park (Agricultural Engineering Department 1108 Shriver Lab The University of Maryland College Park MD 20742-5711). He received his B.S. in Iran and his M.S. and Ph.D. from the University of Nebraska and North Carolina State University respectively. His current research interests include transport and shallow water table management modeling to quantify the hydrologic and water quality responses of agricultural watersheds.2 William L. Magette is assistant professor of Agricultural Engineering at The University of Maryland College Park (Agricultural Engineering Department 1126 Shriver lab The University of Maryland College Park MD 20742-5711). He received his B.S. M.E. and Ph.D. from Virginia Polytechnic Institute and State University. Currently his research and extension programs address water quality impacts of agricultural best management practices.3 Leslie L. Shoemaker is a former USDA National Needs Fellow in the Department of Agricultural Engineering where she is pursuing a Ph.D. degree (Agricultural Engineering Department University of Maryland College Park MD 20742-5711). The focus of her research program is on augmentation of the GLEAMS model to describe the hydrologic behavior of the vadose zone. She previously has been extensively involved in model applications for non-point source pollution control both in a graduate degree program at Cornell University and as an engineer with the Interstate Commission on the Potomac River Basin. She is currently employed as a water resources engineer with Green-home and O'Mara Greenbelt Maryland.

Non-point source pollution of ground water systems has become a national concern in recent years. Researchers and regulatory agencies are investigating the source and processes of the contamination. Agricultural best management practices (BMPs) traditionally developed to reduce non-point source pollution of surface water resources are being investigated for their impact on ground water quality. This study used the CREAMS model to simulate the long-term effects of seven different BMPs on nitrate nitrogen (NO3-N) loadings to a shallow, unconfined ground water system. Two representative watersheds, 5.8 and 8.9 hectares (14.3 and 22 acres) in area, in the Coastal Plain physiographic region of Maryland were selected for study. Soils in these watersheds belong to the Matapeake silt loam series and have moderate infiltration capacity. Results from this study indicated that BMP's used in conjunction with winter cover (barley) reduced NO3-N leaching to the ground water system. It was also found that turfgrass reduced surface losses of water and nitrogen, but increased leaching losses of water and NO3-N significantly. All of the BMPs simulated in this study resulted in leachate NO3-N concentrations exceeding 10 ppm, the U.S. EPA health standard for public drinking water, indicating a need for alternate practices for reducing nitrate leaching.

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FIELd SAMPLING OF RESIdUAL AVIATION GASOLINE IN SANdY SOIL

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GROUNd WATER MONITORING ANd REMEdIATION 1991年第2期11卷 107-120页

作者： OSTENdORF, dW LEACH, LE HINLEIN, ES XIE, YF 1 David W. Ostendorf is an associate professor in the Environmental Engineering Program of the Civil Engineering Department at the University of Massachusetts (Civil Engineering Department University of Massachusetts Amherst MA 01003). His research interests include unconfined aquifer contamination hazardous waste site remediation and analytical modeling of problems in environmental fluid mechanics. Dr. Ostendorf is a registered professional engineer in Massachusetts and a member of the American Geophysical Union American Society of Civil Engineers Soil Science Society of America Water Pollution Control Federation and Association of Environmental Engineering Professors as well as the National Water Well Association.2 Lowell E. Leach is an environmental engineer with the Robert S. Kerr Environmental Research Laboratory of the U.S. Environmental Protection Agency (RS Kerr Environmental Research Laboratory U.S. EPA P.O. Box 1198 Ada OK74820). Leach received his B.S. ingeological engineering at the University of Oklahoma in 1959 and has been a registered professional engineer in Oklahoma since 1966. With 29 years of experience in field applications of geological engineering he is responsible for developing methodology for sampling ground water and subsurface materials for the Robert S. Kerr Environmental Research Laboratory.3 Erich S. Hinlein is a research assistant in the Environmental Engineering Program of the Civil Engineering Department at the University of Massachusetts (Civil Engineering Department University of Massachusetts Amherst MA 01003). His research interests include ground water pollution hazardous waste site investigation and transport processes in unconfined aquifers. Hinlein graduated with a B.S. in electrical and computer engineering from the University of Massachusetts at Amherst in May 1985 and entered the Environmental Engineering Master's Degree Program in January 1989.4 Yuefeng Xie is a postdoctoral research associate in the Environmental Engineering Program of the Civil E

Two complementary field sampling methods for the determination of residual aviation gasoline content in the contaminated capillary fringe of a fine, uniform, sandy soil were investigated. The first method featured field extrusion of core barrels into pint-size Mason jars, while the second consisted of laboratory partitioning of intact stainless steel core sleeves. The barrel extrusion procedure involved jar headspace sampling in a nitrogen-filled glove box, which delineated the 0.7m thick residually contaminated interval for subsequent core sleeve withdrawal from adjacent boreholes. Soil samples removed from the Mason jars (in the field) and sleeve segments (in the laboratory) were subjected to methylene chloride extraction and gas chromatographic analysis to compare their aviation gasoline content. The barrel extrusion sampling method yielded a vertical profile with 0.10m resolution over an essentially continuous 5.0m interval from the ground surface to the water table. The sleeve segment alternative yielded a more resolved 0.03m vertical profile over a shorter 0.8m interval through the capillary fringe. The two methods delivered precise estimates of the vertically integrated mass of aviation gasoline at a given horizontal location, and a consistent view of the vertical profile as well. In the latter regard, a 0.2m thick lens of maximum contamination was found in the center of the capillary fringe, where moisture filled all voids smaller than the mean pore size. The maximum peak was resolved by the core sleeve data, but was partially obscured by the barrel extrusion observations, so that replicate barrels or a half-pint Mason jar size should be considered for data supporting vertical transport analyses in the absence of sleeve partitions.

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