United States Environmental Monitoring Environmental Protection and 5upport Laboratory Agency PO Sox 15027 Las Vegas NV S9114 October-December 1376 oEPA Fourth Quarter Report Environmental Monitoring and Support Laboratory Las Vegas .A i ------- FOURTH QUARTER REPORT OF THE ENVIRONMENTAL MONITORING AND SUPPORT LABORATORY LAS VEGAS OCTOBER THROUGH DECEMBER 1978 U.S. ENVIRONMENTAL PROTECTION AGENCY OFFICE OF RESEARCH AND DEVELOPMENT ENVIRONMENTAL MONITORING AND SUPPORT LABORATORY LAS VEGAS, NEVADA 89114 ------- CONTENTS Page BIOLOGICAL MONITORING 1 MONITORING SYSTEMS DEVELOPMENT 3 EQUIPMENT AND TECHNIQUES DEVELOPMENT 5 MONITORING 6 QUALITY ASSURANCE 8 TECHNICAL SUPPORT 9 TECHNICAL REPORTS AND PRESENTATIONS 13 ------- BIOLOGICAL MONITORING Phenol levels in human urine have been used in the past to quantitatively measure exposure to benzene because benzene is converted to phenol by the liver. The Laboratory has completed a series of studies to determine the effect of lead on the ability of rat liver enzyme preparations to convert benzene to phenol because humans may be simultaneously exposed to these agents, both of which are present in gasoline. Results from an in vitro study showed that the conversion of benzene to phenol by rat liver homogenate is enhanced when very low concentrations of lead nitrate are added to such preparations. However, increased concentrations of lead nitrate inhibit this conversion. In a second study, rats were exposed for 15 weeks to lead chloride in their drinking water. After 6, 9, 12 and 15 weeks, a group of control and lead-treated rats were sacrificed. Liver, bone, and blood samples from each rat were obtained and are being prepared for lead analysis. Liver enzyme homogenates were prepared from each rat and the ability of the homogenates to convert benzene to phenol was examined. At the end of this study, a statistically significant increase in the ability of liver enzyme preparations to convert benzene to phenol was observed in lead-treated rats. The results of these studies show it is possible that exposure to lead at low levels could increase phenol excretion, whereas exposure at higher concentrations could inhibit the conversion of benzene to phenol. Therefore, monitoring urinary phenol as an index of benzene exposure in humans should be used with caution because exposure to benzene in gasolines usually involves simultaneous exposure to lead. (Data source: Dr. J. A. Santolucito, Ext, 276) In order to compare the biological availability of lead from auto exhaust with that shown in results of lead-salt studies completed earlier, 36 rats were fed dust collected from four different public schools in the Los Angeles area. Ten rats were used as controls. The animals were housed in metabolism cages and fed 1/2 gram of dust daily for 59 days. Urine and feces samples were collected daily and composited by groups. Individual samples were collected weekly. Tissue samples from the sacrificed animals are being analyzed for lead and other pollutants. (Data source: A. A. Mullen, Ext. 281) 1 ------- In efforts to identify critical routes of exposure to ubiquitous organic and inorganic pollutants, the Laboratory is developing methods for assessing the transformation of toxic chemicals mediated by biological and nonbiological soil factors. Current studies are concerned with binding constants and partitioning coefficients. (Data source: Dr. G. B. Wiersma, Ext. 294) The rates of uptake of inorganic and organic chemicals by plants are being researched through the use of experimental microcosms. This project is aimed at developing sampling methodology. Plans are to study carbon dioxide management techniques and the phenomena and effects of oxygen and ethylene as they are produced and utilized in the microcosms. {Data source: Dr. J. C. McFarlane, Ext. 394) In studies to develop an exposure monitoring methodology for precursors of carcinogens, five commonly used carbamate pesticides were tested for their ability to serve as precursors of nitrosamine biosynthesis. Of the five, the dithi©carbamate, Ziram, was found to be most effective. Sodium thiocyanate was found to tatalyze the biosynthesis of M-nitrosomorpholi ne and both alphatocopherol and ascorbic acid were found to inhibit its biosynthesis. (Data source: Dr. J. A. Santolucito, Ext. 276) DOE REIMBURSABLE BIOLOGICAL MOfllTORIUG ACTIVITIES The Laboratory continued operation of the Nevada Test Site experimental farm in support of the Department of Energy. Activities included the roundup of the Area 18 beef herd and the semiannual sacrifice and sampling of six animals. Forty animals were deemed surplus and transferred to the University of Nevada-Reno. All 1978 calves were transported to Area 15 for weaning and branding. Samples were collected from 20 desert bighorn sheep through the cooperation of licensed hunters. Other animals sampled during this period include a feral horse, two chukkar, two golden eagles and a mule deer, whose deaths were the result of accidents. The deer migration study was also continued. (Data source: Dr. D. D. Smith, Ext. 281) 2 ------- MONITORING SYSTEMS DEVELOPMENT EXPOSURE MONITORING METHODOLOGY To improve various aspects of monitoring systems design, the Laboratory is developing statistical methods to analyze existing data bases and nonitoring operational records. During this quarter, work was initiated on the development of an algorithm for selecting the optimum number of sampling sites in a network for monitoring air quality. Meteorological data are being analyzed to verify, for carbon monoxide in St. Loui s, the alternative network design methodology based on wind gradients (airflow). (Data source: Dr. J. L. McElroy, Ext. 241) Work was initiated on developing an updated emissions inventory of hydrocarbons and oxides of nitrogen in the Las Vegas Valley for input to the photochemical source-grid diffusion model . Concurrently, application tests of the deterministic wind model are being conducted in the Valley. Additional hydrocarbon data are required: supplemental measurements must be taken during the oxidant season {spring and summer). (Data source: Dr. J. J. Behar, Ext. 241) GEOTHERMAL IMPACT ASSESSMENT The Laboratory is conducting studies to assess the actual and potential environmental impacts of existing and potential geothermal energy resource development. As part of this program, plant and animal studies are being conducted in the known geothermal resource area (KGRA) around Roosevelt Hot Springs, Utah. To date, plant and soil samples have been collected from 287 sites and prepared for analysis, with tissues and soi 1 extracts in the process of analysis. Plant community/aerial photograph mapping has been completed and soil and plant communities were identified. The animal field investigations to select animal indicators as biological monitors for geothermal resource development have been completed. Tissue samples collected from the fauna in the KGRA have been assayed for elemental concentrations, with assays for lead in bone, and arsenic in hair in process. 3 ------- These element concentration data are being entered on a Laboratory computer program for data reduction along with small marxial population data previously entered. (Data source : K. W. Brown, Ext. 394) Plant uptake studies using different concentrations of geothermal brines were completed in laboratory greenhouse and environmental simulator facilities. These studies included root exposures of various plant species via hydroponic and soil applications. The movement of geothermal brines in various soils was also documented. (Data source: Dr. G. B. Uiersma, Ext. 394) ENERGY-RELATED MONITORING The Laboratory is participating in a comprehensive program to provide and evaluate air and water quality data in the western areas of the U.S. that are or will be most seriously impacted by present or projected energy-related development activities. In one of the energy-related projects, data are being analyzed from the first 6 months of field measurements in the 14-station visibility monitoring network, covering portions of the five states in the Four Corners area. A Visibility Research Station has been set up at Canyonlands National Park to test various visibility measurement methods. A comprehensive report on the state-of-the-art of visibility monitoring technology is being prepared in conjunction with this project. Monitoring guidelines for fluidized bed combustion of coal are being developed through a contractor. Environmental pollutants associated with the various processes of fluidized bed combustion were identified and characterized. (Data source: Dr. D. N. McNeli s , Ext. 261) Monitoring research is also being conducted on groundwater quality impacts from oil shale developments and strip mining of western coal. Efforts concerning strip mining have dealt with the design on monitoring programs for three related areas: pollution problems concerned with population relocation, active mines and mi nemouth electric power plants, and reclaimed mine sources. Activities concerning oil shale emphasize the impacts of modified in situ processes, including the identification and priority ranking of associated pollutants and potential pollution sources. (Data source: L . G . McMi11 ion, Ext. 241) 4 ------- EQUIPMENT AND TECHNIQUES DEVELOPMENT The Laboratory is evaluating use of an airborne laser fluorosensor to remotely monitor surface waters for the concentration of chlorophyll in algae. The system, presently installed in a Laboratory helicopter, uses a downward- looking pulsed laser to excite fluorescence in the chlorophyl1-beari ng algae present in varying concentrations in all natural surface waters. Extensive laboratory tests were performed during this quarter to find a suitable set of filters to isolate the Raman reference signal from water. This signal is used to normalize the return fluorescence signal. Tests of the system in flight will be conducted during the first quarter of calendar year 1979. Aerial multispectral scanner data and photographic imagery have been collected with the Laboratory's remote sensing aircraft with partial support from the Naval Oceanographic Research and Development Activity (TIORDA) Gulf Loop Experiment near Panama City, Florida. This information was collected coincident with satellite overflights and ground data collection by other participati ng organizations. The data are to be used by the Laboratory to examine spectral reflectance properties of water bodies and the intervening atmosphere as input to remote sensing development such as measurement of turbidity levels. In addition to the use and refinement of aerial photograph interpretation "keys" developed by other agencies, the Laboratory is developing keys specific to environmental assessment. These keys are particular patterns, texture, color differences, structures, or other characteristics on aerial photographs that enable a trained photointerpreter to identify and characterize surface situations or conditions. A sanitary landfill leachate detection/impact interpretation key and harbor pollution source key have been completed and are currently being evaluated. Development of the failing septic system keys has opened a vigorous line of technical support activity. Programs using keys developed at this Laboratory are presently active in Regions 3, 5 and 8, with similar programs under the Resource Conservation and Recovery Act in the States of Massachusetts, Connecticut and Maine. (Data source: Dr. D. N, McNeli s, Ext. 261} 5 ------- MONITORING The Las Vegas Laboratory provided radiological safety support for all nuclear tests conducted at the Nevada Test Site by the U.S. Department of Energy during this quarter. This support included participation in the Containment Evaluation Panel and the Test Controller's Advisory Panel meetings, the use of aircraft for meteorological measurements and aerial noni tori ng, and the deployment of mobile radiological monitoring personnel to the off-site areas downwind of the projected wind trajectory path. No release of radioactivity occurred as a result of tests conducted during this quarter. Plans were formulated for compilating historical exposure assessments from nuclear testing activities. Stored files and records were recovered and data compilations will begin in March 1979. Technical support was given to the florthern Marshal 1 Island Survey. Thirteen atolls and islands were photographed and aerially surveyed for gamma radiation, and samples were collected of water, marine organisms, soil, edible crops, domestic animals, and native vegetation. The Air Surveillance Network (ASH), consisting of 49 continuously operating stations, was active during this period. Standby stations at 66 locations in states west of the Mississippi River were activated in December to monitor for airborne radioactivity resulting from the atmospheric nuclear test of December 14, 1978, by the People's Republic of China. All stations continued to operate throughout the quarter. Preliminary analytical results of selected air samples collected from the ASN indicated that the airborne radioactivity from the Chinese test of December was below the minimum detectable concentrations for individual radionuclides. However, after all samples from the ASN for this quarter were analyzed, the fresh fission products iodine-131 and barium-140 were detected at concentrations slightly above detection limits at locations other than those selected for preliminary reporting. The highest concentrations of these nuclides were 0.085 picocuries per cubic meter (pCi/m^) at Sozeman, Montana, and 0.25 pCi/m^ at Provo, Utah, respectively. Both these concentrations were <0.03 percent of the maximum permissible concentration recommended by the National Committee on Radiation Protection for continuous exposure of the general population. The Noble Gas and Tritium Surveillance Network was continued with four on-site and seven off-site stations in operation. Construction of a prototype sampling system utilizing a cryogenic refrigerator to collect liquid air samples is nearly complete. Preparations for field evaluation after its completion are in process. 6 ------- The Milk Surveillance Network and the Dosimetry Network were operated as usual. Routine quarterly milk samples were collected from 16 locations and the quarterly exchange of thermoluminescent dosimeters used for monitoring integrated ambient radiation exposure at 78 locations was completed. Quarterly water samples were collected for the fourth time from the 12 new wells at the Project Dribble site in Mississippi. These sampling wells are used for monitoring subsurface tritium contamination caused previously by post-shot drill-back and cleanup operations. Also, 31 monthly water samples were collected at 11 sampling locations for the Long-Term Hydrological Monitoring Program at the Nevada Test Site. (Data source: E. W. Bretthauer, Ext. 342) 7 ------- QUALITY ASSURANCE The Laboratory conducts a nationwide interlaboratory comparison quality assurance program to help assure that environmental data produced by federal, state, local, and private laboratories are compatible, accurate, and legally defensible. Approximately 1,000 samples of various environmental media {milk, water, air, food, soil, and gases) containing known activity levels of various radionuclides were distributed to the 180 participating laboratories for analyses. The precision and accuracy of their radioactivity measurements were assessed and reports were sent to the participants at monthly or quarterly intervals. Also, a second "laboratory performance evaluation study (blind sample) was prepared and distributed in support of the National Interim Primary Drinking Water Regulations. At the request of Regions I and 2, onsite laboratory evaluations were conducted and reports of findings prepared for five state laboratories. Also, at the request of Region 4, assistance was provided in the evaluation of a radiation laboratory in Kentucky, {Data source: A. N. Jarvis, Ext. 381) 8 ------- TECHNICAL SUPPORT On request of the Office of Toxic Substances, the Laboratory completed a search and procurement of government agency archival aerial photography for 51 industrial facilities. The photographic data will be reproduced and used as base maps for Agency planning in monitoring industrial facilities producing toxic substances. The enlargement of photographs at various scales will continue into the first quarter of calendar year 1979. A project was initiated to acquire light aircraft sensor pod (ENVIRO-POD) and contractor support aerial photography of hazardous waste disposal sites. The information, as requested by the Office of Solid Waste, will be furnished in the form of photography, map overlays, briefing visual aids, and narrative interpretations, supplemented with other government reports and data. On request of the Bureau of Reclamation through Region 8, aerial multispectral scanner and photography flights are being conducted to locate small seeps and saltwater springs in the temperature range of 13° C to 18° C at a site in Colorado. The Laboratory performed a demonstration project using remote sensing applications techniques to support development and implementation of marine discharge regulations on request of the Water Program Operations Office. Two test sites in Boston Harbor were used to demonstrate aerial photography and multispectral scanning in mapping differences in turbidity, temperature, and marine discharges from municipal outfalls. At the request of the Oil and Special Materials Control Division (OSMCD) of the Office of Water and Waste Management, in cooperation with Region 4, the Laboratory provided emergency response support in collecting and analyzing aerial photography of a train wreck near Princeton, Kentucky. The train, carrying vinyl chloride, chlorine, sodium chlorate, amyl chloride, and hydrogen peroxide, had derailed. Also on request of the OSMCD, flights were conducted in support of the Spill Prevention Control and Counter-measures Program. These services entailed imagery-collection flights and delivery of annotated photographs and maps and a detailed written report. These projects were to: • inventory and inspect selected oil fields in the Allegheny National Forest near Warren, Pennsylvania. 9 ------- • inventory and inspect Aneth Oil Fields near Bluff, Utah, and the San Juan River. • locate and document oil spilling into the Farmington Bay Bird Refuge near Famington, Utah. (It was estimated that 3,000 barrels of oil had escaped from a rupture in a pipeline before the flow could be restrained or diverted.) • locate and document oil spilling into the Red River and Big Rock Coulee from production areas near Cut Bank, Montana. • collect and analyze color infrared photography of oil-affected mangroves and marsh areas in East Tampa Bay in support of an environmental assessment of the area following an oil spill that occurred in October 1378. Remote sensing projects conducted for EPA Regional Offices are listed below by Region. Those indicated by an asterisk(*) were initiated during this quarter or are continuing, all others having been completed. All projects entailed the acquisition, processing, interpretation, and delivery of data collected from aerial platforms. The resultant data were presented in the form of color and infrared photography, map sheets, annotated overlays or other imagery displays, and detailed narrative reports, as requested by the Region. REGION 3 Aerial imagery was acquired with use of the ENVIRO-POD, processed and interpreted, and provided along with technical briefings to the U.S. Attorney's Office, Eastern District of Pennsylvania, in support of litigation involving four mushroom-growing farms in Chester County. The material furnished was instrumental in proving effluent violations. Thermal scanning was used to determine if various power plants in Pennsylvania, Mew Jersey, and the Washington, D.C., area are in compliance with the thermal limitations imposed in their National Pollutant Discharge Elimination System (NPDES) permits. These limitations are state thermal water quality standards applied outside designated mixing zones. The report furnished included photographs of thermal plumes and isothermal data depicted on scaled illustrations of the receiving stream. REGION 4 * Photographic and multispectral scanner data of selected sites were collected for the Region Enforcement Division. These sites are presently controversial and enforcement action is anticipated. Baseline data will also be collected along the coastline where permit and enforcement action is expected. 10 ------- Aerial photographs collected over Everglades City, Florida, were comprehensi vely analyzed in support of Enforcement Division litigation. Photo mosaics were compiled with annotated overlays and an analysis report of drainage patterns was furnished, including identifiction of vegetation types. Photoanalysts participated in pre-trial conferences. REGION 5 Remote sensing techniques were used to characterize the environment of the Nettle Lake area of Williams County, Ohio. The work was in support of environmental impact statement preparation involving construction of a wastewater collection and treatment system. Color aerial photographs of the lake were collected and used as a common base map for displaying existing environmental components. Overlays displayed the following categories of information: water drainage, vegetation type and extent of cover, existing land use, political boundaries, soil types and location, significant geologic formations, groundwater location, potential flood-prone zones, types and habitat location of rare and endangered wildlife species, and the area topography. Components that have common or mutual relationships were combined on a single overlay for convenience in future analysis. A narrative text was also furnished, identifying significant features or characteristics. REGION 6 * Aerial photographic data are being collected to document surface water drainage through a uranium mill near Marquez, and to update photographic coverage of a uranium mill and adjacent open-pit mines near Moquino, New Mexico. Remote sensing techniques were applied to delineate the "bottomland" and measure acreages in the Cache River Basin in central Arkansas for an inventory being prepared by the Region. REGION 7 Separate technical reports for the spring and summer seasons, including duplicate copies of aerial imagery, were prepared to detect seeps and springs which allow groundwater to surface and drain into the Cedar River in Iowa. Two industrial sites were also surveyed in this project to determine if waste pond seepage was reaching the river. Photographic data were collected to complete a Regional land-use study of Soldier Creek Basin near Kansas City, Kansas. The Space Technology Center, University of Kansas, wil1 interpret the film to identify 1 and uses, land cover, erosion sites and land treatment practices. 11 ------- REGION 8 Color infrared photography of federal oil shale lease tracts and other oil shale properties was acquired to complement available photographic coverage of the areas in the Western Energy Program. REGION 10 Remote sensing methods were used to evaluate water quality and hydraulic characteristics of marinas in the Pacific Northwest. Data on temperature, chlorophyll a^ oil and grease, and Rhodamine WT dye were used to establish guidelines for review of construction permits. The data delivered include maps of each parameter. (Data source : Dr. D. N. HcNel i s, Ext. 261) CONSULTATION On request of Regional and other EPA offices, consultation services are routinely provided by Laboratory technical and scientific personnel . During this quarter Laboratory representatives provided the following services: Reviewed "Alternative for Management of Atchafalaya Basin," a report to be presented at public meetings; and assisted in preparation of an Atchafalaya Basin public information brochure and a notice, "Announcement of Public Meetings to Discuss Management Alternatives of the Atchafalaya Basin.'' These services were provided in conjunction with sampling and evaluation services being provided by the Laboratory as part of an interagency study of environmental management problems in the Atchafalaya, Louisiana, Basin. Remote Sensing Division representatives attended the EPA Environmental Impact Statement Preparers Conference held in San Antonio, Texas, November 14 through 17, 1978. Aerial photo interpretation and digital image analysis methods used as alternatives to ground survey work were presented. Included were surveying areas for failing septic tanks and analysis through computerized digital integration of environmentally significant parameters such as land use, topography, soils, rainfall, and population density. 12 ------- TECHNICAL REPORTS AND PRESENTATIONS PROJECT REPORTS DISTRIBUTION OF PHYTOPLANKTON IN INDIANA LAKES, by F. A. Morris, et al ., V. W. Lambou, project officer. EPA-600/3-78-078, August 1978. TRACE ELEMENTS IN SOIL AROUND THE FOUR CORNERS POWER PLANT, by G. B. Wiersma and A. B. Crockett. EPA-600/3-78-079, August 1978. TESTS OF THE DUAL DIFFERENTIAL RADIOMETER UNDER FIELD CONDITIONS, by R. W. Thomas. EPA-600/4-78-045, August 1978. MERCURY, LEAD} ARSENIC, AND CADMIUM IN BIOLOGICAL TISSUE: THE NEED FOR ADEQUATE STANDARD REFERENCE MATERIALS, by Werner F. Beckert. EPA-600/4-78-051, August 1978. DEVELOPMENT OF A POLLUTANT MONITORING SYSTEM FOR BIOSPHERE RESERVES, by G. B. Wiersma, et al . EPA-600/4-78-052, September 1978. CARBON MONOXIDE NETWORK DESIGN METHODOLOGY—APPLICATION IN THE LAS VEGAS VALLEY, by J. L. McElroy, et al . EPA-600/4-78-053, September 1978. AIRBORNE MEASUREMENTS OF A COPPER SMELTER PLUME IN MONTANA: The Anaconda Company, Anaconda, Montana, October 1 - December 9, 1976; by F. G. Johnson, et al. EPA-600/4-78-054, September 1978. GROUND-BASED SULFUR DIOXIDE MEASUREMENTS WITHIN A COPPER SMELTER PLUME— ANACONDAj MONTANA, by J. J. van Ee. EPA-600/4-78-055 , September 1978. EVALUATING THE SAMPLING FREQUENCIES OF WATER QUALITY MONITORING NETWORKS by D. S. Gilmore, project officer. EPA-600/7-78-169, August 1978. AUTOMATED IN SITU WATER QUALITY SENSOR WORKSHOP, FEBRUARY 14-15, 1978. EPA-600/9-78-034, October 1978. 13 ------- PAPERS PRESENTED METEOROLOGY FOR ENVIRONMENTAL ASSESSMENT, by G. B. Morgan, T. R. Hauser, 0. G. Ballinger. Presented by Erich Bretthauer at the 1978 Symposium of the National Conference of Standards Laboratories, Washington, D .C., October 4, 1978. A LIGHT AIRCRAFT CAMERA POD, THE ENVIRO-POD, by Gordon E. Howard, Jr. Presented at the American Society of Photogrammetry, Albuquerque, New Mexico, October 15-21, 1978. MULTISPECTRAL SCANNING FOR ENVIRONMENTAL MONITORING, by David N. McNelis and Robert W. Landers. Presented at the Water and Wastewater Symposium, Miami, Florida. November 12-16, 1978. REPORTS OF DEPARTMENT OF ENERGY REIMBURSABLE WORK ANIMAL INVESTIGATION PROGRAM 1976 ANNUAL REPORT; NEVADA TEST SITE AND VICINITY, by D. D. Smith, et al. EMSL-LV-0539-20. AGRONOMIC PRACTICES OF THE NEVADA TEST SITE EXPERIMENTAL DAIRY FARM FROM 1974 THROUGH 1977, by E. M. Daley. EMSL-LV-0539-21. METABOLISM OF AMERICIUM-241 IN DAIRY ANIMALS, by W. W. Sutton, et al . EMSL-LV-0539-22. 14 ------- Director G.B. Morgan Deputy Director Di. R.E. Stanley Information Services Staff G.S. Douglas Environmental Monitoring and Support Laboratory P.O. Box 15027 • 944 East Harmon • Las Vegas, Nevada 89114 Telephone (702)736-2969 • FTS 695-2969 Tenant Organizations Office of Program Management and Support W.E. Pelrie Branches: General Services M. Carpenter Computer Services G. Allison Facilities and Engineering Services R. Coulter Health and Safety Staff Dr. M.E. Kaye Monitoring Systems Design and Analysis Staff D.B. Gilmore. Actg. Monitoring Systems Research and Development Division Or. J. A. Santolucito Branches: Methods Development and Analytical Support Or. E. Meier Quality Assurance A Jarvis Pollutant Pathways Or. G Wiersma Exposure/Dose Assessment Dr. G. Poller Farm and Animal Investigation Or. 0. Smith Monitoring Operations Division E W. firetihauer Branches: Water and land Quality V. Larabou Air Quality R. Snelliity Environmental Radiation W. Bliss, Actg Aircraft Operations C. Dropp Remote Sensing Division Or. O N. McNelis Branches: Remote Sensing Operations H. Landers Remote Monitoring Methods J. Echert Environmental Photographic Interpretation Complex V. Webb Office of Radiation Programs, Las Vegas Facility D.W. Hendricks Regional Services Staff R.E. Jaquish Las Vegas Accounting Office i.A. Demers Personnel Office Las Vegas A. Sandoval, Jr. Region IX Las Vegas Unit R. Cummins Office for Civil Rights M. Woods ------- United States Environmental Protection Agency Environmental Monitoring and Support Laboratory P O. 8on 15027 Las Vegas NV 89114 Officat Business Penalty for Private Usa $300 EPA REGION V, LIBRARY 230 SOUTH DEARBORN* ROOM 1417 516 Postage and Fees Paid Environmental Protection Agency EPA 335 First Class Mail CHICAGO, II *0604 If your rttfrm* )« incorrect pi«aa« cfts-ngt on th# <6o«* latwi; l««r olf; *nd r#tum ta EM *t>ov* *ddr**c, if GO not d«*lr* ig conllnu* rtcrtvmg |hl»t»cniC*J report «fl«. CHECK HERS Q t**r oft libd, mms return it lo tP» a.bovt idtirvft*. ------- |