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1201:		Title:	Illinois Workers' Compensation Commission FY 2004 Annual Report
		Volume/Number:
		Issuing Agency:
		Description:	The annual report contains the statistics that are available on workers' compensation in Illinois, including a comparison of Illinois to neighboring states and large industrial states. The report also includes budget information, highlights of the year, the agency's mission statement, and lists of board members.
		Date Created:	06 03 2005
		Agency ID:
		ISL ID:	000000000886 Original UID: 859 FIRST WORD: Illinois

1202:		Title:	Manual del Seguro de Accidentes de Trabajo y Enfermedades Profesionales
		Volume/Number:
		Issuing Agency:
		Description:	The handbook serves as a general guide to the rights and obligations of workers and employers under workers' compensation in Illinois. This handbook refers only to those injuries or illnesses that occurred before February 1, 2006.
		Date Created:	1990
		Agency ID:
		ISL ID:	000000000887 Original UID: 867 FIRST WORD: Manual

1203:		Title:	Open Space Lands Acquisition and Development Grant Program Annual Report Fiscal Years 2005 and 2006
		Volume/Number:
		Issuing Agency:
		Description:	This annual report reflects the fiscal year 2005 and 2006 OSLAD grant program activities. The report includes a history of the program; project selection process of program mechanics and priorities; project awards for each fiscal year with summary information and funding; project awards by county and legislative districts; OSLAD administrative rule.
		Date Created:	10 03 2006
		Agency ID:
		ISL ID:	000000000888 Original UID: 869 FIRST WORD: Open

1204:		Title:	Mason County 2005 Taxing Districts
		Volume/Number:
		Issuing Agency:
		Description:	Illinois Taxing District Map for Tax Year 2005. Geospatial data representing taxing district boundary information collected from Illinois county clerks. Map identifies the boundaries of property tax districts to be used for general illustration and research.
		Date Created:	01 31 2006
		Agency ID:
		ISL ID:	000000000889 Original UID: 871 FIRST WORD: Mason

1205:		Title:	Massac County 2005 Taxing Districts
		Volume/Number:
		Issuing Agency:
		Description:	Illinois Taxing District Map for Tax Year 2005. Geospatial data representing taxing district boundary information collected from Illinois county clerks. Map identifies the boundaries of property tax districts to be used for general illustration and research.
		Date Created:	01 31 2006
		Agency ID:
		ISL ID:	000000000890 Original UID: 872 FIRST WORD: Massac

1206:		Title:	McDonough County 2005 Taxing Districts
		Volume/Number:
		Issuing Agency:
		Description:	Illinois Taxing District Map for Tax Year 2005. Geospatial data representing taxing district boundary information collected from Illinois county clerks. Map identifies the boundaries of property tax districts to be used for general illustration and research.
		Date Created:	01 31 2006
		Agency ID:
		ISL ID:	000000000891 Original UID: 873 FIRST WORD: McDonough

1207:		Title:	Post workshop summary, The Sino-U.S. joint workshop on sediment transport and sediment induced disasters, March 15-17, 1999, Beijing, China
		Volume/Number:	2000
		Issuing Agency:
		Description:	The First Sino - U.S. Joint Workshop on Sediment was organized with strong support from both the United States and China, with the intention to strengthen information exchange and cooperation on research on emerging hydro-environmental problems. The Natural Science Foundation of China has established a national key research project, Study on Mechanisms of River Sedimentation, Disasters, and Control Strategies in China, and is interested in establishing a bilateral cooperation program with the United States on sediment transport and sediment-induced disasters. A joint workshop was considered to be an effective approach for scientists and engineers from both countries to exchange knowledge and experience, to explore research and educational needs, and to initiate future collaborations. In a three-day meeting in Beijing, China, followed by a five-day field study in the Loess Plateau along the middle reach of the Yellow River, the participants exchanged information on sediment-related topics and identified opportunities for future research and cooperation. A major emphasis of the workshop was to promote direct discussions, and the workshop sessions were structured accordingly. The format worked very well and resulted in ample exchange of experiences and needs for future studies. This report presents information from the workshop and summaries of discussions from the meeting in Beijing.
		Date Created:	9 24 2004
		Agency ID:	IEM-2000-01
		ISL ID:	000000000892 Original UID: 999999994075 FIRST WORD: Post

1208:		Title:	El Nino 1997-1998 in the Midwest
		Volume/Number:	2000
		Issuing Agency:
		Description:	An anomalously warm El Nio event developed in the eastern tropical Pacific Ocean during May-August 1997. El Nio events have become recognized as capable of having major effects on atmospheric circulation patterns over North America and elsewhere, leading to predictable outcomes for future seasonal weather conditions. The source of the nation's official long-range predictions, the National Oceanic and Atmospheric Administration (NOAA) Climate Prediction Center (CPC), began issuing forecasts in May 1997 about the event's development and growth to near record proportions. The emerging El Nio was expected to match or exceed the El Nio of 1982-1983, the strongest of this century. Predictions of the future weather conditions expected over the nation, as a result of El Nio's influence on the atmosphere, also were issued by CPC beginning in June 1997. Basically, these and subsequent predictions called for a fall, winter, and early spring in the Midwest that would have above normal temperatures and below normal precipitation. The predictions also called for storms and precipitation to increase in other parts of the nation, particularly in the South and West Coast areas. Media and wide public interest in the evolving record event brought inquiries to the Midwestern Climate Center (MCC) during June 1997. At that time, MCC leadership launched special studies and efforts related to the El Nio event, which included: a climatological reanalysis of past El Nio events and the associated weather conditions in the Midwest, the issuance of outlooks based on these studies, and the collection and analysis of data on the impacts caused by the El Nio-generated weather conditions in the Midwest. This decision was in keeping with past MCC research policy that has focused on assessing extreme Midwestern weather conditions like the 1988 drought (Changnon, 1991a and b), the 1993 flood (Kunkel, 1996; Changnon, 1996), and the 1995 heat wave (Kunkel et al., 1996; Changnon et al., 1996). These studies also focused on identifying and quantifying the impacts of these extreme events. The findings of such activities help the MCC respond rapidly and accurately to numerous regional inquiries for data and information about such extreme events. They also help the MCC prepare for effectively addressing similar events in the future. During the El Nio event, beginning in June 1997 and ending in May 1998, the MCC scientists issued several climate outlooks about future Midwestern conditions. These were basically probabilistic-based statements and focused on the winter of 1997-1998, spring 1998, and summer 1998 outcomes. During the El Nio event, the MCC staff collected and recorded all the relevant weather data for the Midwest. Data defining the impacts of El Nio-generated weather events were collected from August 1997 through August 1998. This report presents information about MCC activities related to El Nio in 1997-1998. It includes three sections: the predictive outlooks issued, a climatic assessment of monthly and seasonal weather conditions during the event, and a description of societal and economic impacts caused in the Midwest. Recommendations are offered in the section "Conclusions and Recommendations" for addressing future El Nio events and the handling of long-range predictions.
		Date Created:	9 24 2004
		Agency ID:	DCS-2000-01
		ISL ID:	000000000893 Original UID: 999999994304 FIRST WORD: El

1209:		Title:	Midwestern Regional Climate Center
		Volume/Number:	2001
		Issuing Agency:
		Description:	Brochure describing the research and services available from the Midwestern Regional Climate Center (MRCC) help to better explain climate and its impacts on the Midwest, provide practical solutions to specific climate problems, and allow us to develop issues-based climate information for the Midwest. Our data and information focus primarily on applications to climate-sensitive sectors and scientific research. In addition to providing on-line access to the interactive, subscription-based Midwestern Climate Information System (MICIS), the MRCC web site provides climate statistics for the Midwest and links to climate resources around the country.
		Date Created:	9 24 2004
		Agency ID:	IEM-2001-01
		ISL ID:	000000000894 Original UID: 999999994318 FIRST WORD: Midwestern

1210:		Title:	Science for Society : Illinois State Water Survey
		Volume/Number:	2001
		Issuing Agency:
		Description:	Brochure describes the Illinois State Water Survey (ISWS), which has been a leader in the study of water resources for more than a century. Founded in 1895, its original mission was to survey the waters of Illinois to trace the spread of waterborne disease, ensure health and safety of public water supplies, improve wastewater treatment, and help develop sanitary standards for drinking water. The mission and scope have expanded to include varied scientific research and service programs relating to water and atmospheric resources of interest to Illinois.
		Date Created:	9 24 2004
		Agency ID:	IEM-2001-02
		ISL ID:	000000000895 Original UID: 999999994319 FIRST WORD: Science

1211:		Title:	Benchmark sediment monitoring program for Illinois streams : data report for water years 1994 and 1995.
		Volume/Number:	2001
		Issuing Agency:
		Description:	The Benchmark Sediment Monitoring Program for Illinois Streams was initiated by the Illinois State Water Survey in 1981 to generate a long-term database of suspended sediment transport. The program is now part of the Water Survey's Water and Atmospheric Resources Monitoring (WARM) Network, which monitors the climate, soil moisture, surface water, ground water, and sediment throughout Illinois. This report summarizes the suspended sediment data collected for the program during Water Years 1994 and 1995. All the techniques used in the data collection process and laboratory analyses are based on U.S. Geological Survey procedures and techniques. The report appendices present tables of instantaneous suspended sediment measurements, particle size analysis, sediment transport curves, and plots of instantaneous sediment concentrations for the period of record for the current monitoring stations.
		Date Created:	9 24 2004
		Agency ID:	DCS-2001-01
		ISL ID:	000000000896 Original UID: 999999994325 FIRST WORD: Benchmark

1212:		Title:	Benchmark sediment monitoring program for Illinois streams : data report for Water Years 1996 and 1997.
		Volume/Number:	2001
		Issuing Agency:
		Description:	The Benchmark Sediment Monitoring Program for Illinois Streams was initiated by the Illinois State Water Survey in 1981 to generate a long-term database of suspended sediment transport. The program is now part of the Water Survey's Water and Atmospheric Resources Monitoring (WARM) Network, which monitors the climate, soil moisture, surface water, groundwater, and sediment throughout Illinois. This report summarizes the suspended sediment data collected for the program during Water Years 1996 and 1997. All the techniques used in the data collection process and laboratory analyses are based on U.S. Geological Survey procedures and techniques. The report appendices present tables of instantaneous suspended sediment measurements, particle size analysis, sediment transport curves, and plots of instantaneous sediment concentrations for the period of record for the current monitoring stations.
		Date Created:	9 24 2004
		Agency ID:	DCS-2001-02
		ISL ID:	000000000897 Original UID: 999999994326 FIRST WORD: Benchmark

1213:		Title:	Plan for Scientific Assessment of Water Supplies in Illinois
		Volume/Number:	2001
		Issuing Agency:
		Description:	Demand for water in Illinois is increasing, and water shortages in the Chicago metropolitan area have been projected. There are, however, limits to the availability of clean water at a reasonable cost. Limitsto water availability are imposed by a number of factors including droughts, legal requirements to maintain minimum flows in rivers and streams, water recharge rates, and a decree of the United States Supreme Court limiting withdrawal of water from Lake Michigan. In addition, the specter of regional climate change could pose the greatest threat to Illinois water supplies over the long term: some projections show the possibility of persistent floods, whereas other projections show persistent droughts. Additional sources of water do exist and can be tapped, but the cost of providing clean water increases with the necessity of water treatment, storage, and distribution, and the mitigation of impacts of new withdrawals on existing water supplies. Long lead times also are needed to construct major water projects. Unless the water supplies of Illinois are planned and managed in a comprehensive, regional, and visionary manner--based on the concept of renewable water supply capacity--water shortages could soon occur in some parts of the state. Water supply planning and management should be based on improved understanding and prediction of water supply and demand, and risk assessment. The goal of this plan is to provide a framework for Illinois State Water Survey (ISWS) water supply programs and to document those studies that ISWS, working with others, needs to conduct to provide Illinois with comprehensive technical data and information, models, and training for water supply planning and management. The following are the main tasks described in the plan: Collaborate with other organizations to coordinate and integrate relevant programs, set priorities, plan activities, conduct studies, and seek additional resources. Assemble, archive, digitize, analyze, and synthesize existing data. Determine areas of possible water shortages as a basis for setting priorities. Evaluate the quantity and quality of water resources throughout the state as they relate to water supply. Provide yield estimates for major aquifers and surface waters under variable and changing climatic conditions. Identify critical data gaps and conduct field studies to gather additional data and monitor the state's water resources. Evaluate opportunities for water conservation and reuse. Interpret and apply technical and economic data to assist and train water resource planners and managers. Develop and improve methods and models to evaluate water resources. Develop new quality-assured databases and an Internet-based decision support system to make data and models easily available for application by other agencies, professionals, and the general public. The rate and order of implementation of these studies will depend upon the level and sources of funds and priorities and upon collaborative efforts with other organizations. Existing resources are addressing many of these topics, but resources are limited so progress will be slow. A major infusion of new resources is needed for timely implementation of the studies described.
		Date Created:	9 24 2004
		Agency ID:	IEM-2001-03
		ISL ID:	000000000898 Original UID: 999999994331 FIRST WORD: Plan

1214:		Title:	Illinois climate
		Volume/Number:	2002
		Issuing Agency:
		Description:	Brochure describing the Illinois State Climatologist, which is located in Champaign, Illinois, at the Illinois State Water Survey (ISWS). The ISWS, a division of the Illinois Department of Natural Resources Office of Scientific Research and Analysis and an affiliated agency of the University of Illinois at Urbana-Champaign, is the primary agency in Illinois for research and information on surface water, groundwater, and the atmosphere.
		Date Created:	9 24 2004
		Agency ID:	IEM-2002-01
		ISL ID:	000000000899 Original UID: 999999994338 FIRST WORD: Illinois

1215:		Title:	Benchmark sediment monitoring program for Illinois streams : data report for Water Years 1998 and 1999
		Volume/Number:	2002
		Issuing Agency:
		Description:	The Benchmark Sediment Monitoring Program for Illinois Streams was initiated by the Illinois State Water Survey in 1981 to generate a long-term database of suspended sediment concentrations and instantaneous sediment loads. The program is now part of the Water Survey's Water and Atmospheric Resources Monitoring (WARM) Network, which monitors climate, soil moisture, surface water, groundwater, and sediment throughout Illinois. This report summarizes the suspended sediment data collected for the program during Water Years 1998 and 1999. All the techniques used in the data collection process and laboratory analyses are based on U.S. Geological Survey procedures and techniques. The report appendices present tables of instantaneous suspended sediment measurements, particle size analysis, sediment transport curves, and plots of instantaneous sediment concentrations for the period of record for the current monitoring stations.
		Date Created:	9 24 2004
		Agency ID:	DCS-2002-01
		ISL ID:	000000000900 Original UID: 999999994339 FIRST WORD: Benchmark

1216:		Title:	A comparison of potentiometric surfaces for the Cambrian-Ordovician aquifers of northeastern Illinois, 1995 and 2000.
		Volume/Number:	2002
		Issuing Agency:
		Description:	In response to expanding urban development, the use of Lake Michigan and other sources for public water supplies, and a growing interest in regional water resources development, this report provides a detailed discussion of groundwater withdrawals and water levels in northeastern Illinois. The water-level portion of this report covers a 15-county area from Lake Michigan to north-central Illinois and from the Wisconsin border south to Kankakee County. Particular emphasis, however, has been given to deep well pumpage in the eight counties of the Chicago region because of the significant shift in the late twentieth century from groundwater supplies of the deep bedrock aquifers to Lake Michigan and other sources. This report details the fall 2000 water-level measurement of wells reaching to the St.Peter and Ironton-Galesville sandstones (deep bedrock aquifers), provides a map illustrating the slope of groundwater levels, and compares the fall 2000 levels to the fall 1995 observations. The rapid decrease in groundwater pumpage from the deep bedrock aquifers during the 1980s initially resulted in a rapid recovery of groundwater levels. However, the rate of water-level change has slowed since the mid-1990s. The greatest recovery during the past five years occurred in Cook County. Groundwater levels in several wells were observed to have risen more than 50 feet since 1995. Where the deep bedrock aquifers of Cambrian-Ordovician age continue to be used, declines in groundwater levels were observed. Most notable declines were in southeastern Kane and northern Kendall Counties, southwestern Lake County, and southeastern McHenry County. Outside the Chicago region, water-level declines were observed in deep wells at Loves Park in Winnebago County and in the vicinity of DeKalb and Sycamore in DeKalb County.
		Date Created:	9 24 2004
		Agency ID:	DCS-2002-02
		ISL ID:	000000000901 Original UID: 999999994346 FIRST WORD: A

1217:		Title:	Identification of factors that aid carbon sequestration in Illinois agricultural systems
		Volume/Number:	2003
		Issuing Agency:
		Description:	Soil organic carbon (SOC) sequestration is important to climate change and cropland agriculture. Crops naturally use the greenhouse gas, carbon dioxide (CO2), from the atmosphere; the greater the crop productivity, the greater the amount of CO2 used. Agronomic practices that enhance sequestration of crop biomass in soil as SOC also enhance removal of CO2 from the atmosphere, and improve and sustain soil fertility. To effectively reduce the concentration of CO2 in the atmosphere and mitigate climate change, sequestration of SOC must be long term, defined as decades or longer. This report presents a review and synthesis of scientific understanding of SOC sequestration, based on the history and genesis of soils and vegetation in Illinois, and the response of SOC and crops to agronomic practices. Recommendations for future cropland SOC research are made. The scientific literature is reviewed in light of the Illinois conditions affecting the five interactive soil-forming factors that are widely recognized (biology, parent material, climate, topography, and time). The literature also shows that human activity can be considered a sixth soil-forming factor. Native American land-use practices of whole ecosystem manipulation were important in governing soil formation and SOC contents in Illinois, as were the land-use practices of the settlers who displaced them. An important finding of this work is that to reduce the atmospheric CO2 content and sustain cropland agriculture, SOC must be sequestered throughout the soil profile. The modern literature reports SOC increases when tillage is changed from conventional to conservation tillage practices. However, SOC measurements are surficial, usually no more than the top 30 cm, with most of the C being sequestered in the top 15 cm. The unstated assumption in the modern literature is that surficial SOC changes represent all the SOC changes in the soil profile. This work shows that the SOC losses in the deeper soil layers may overwhelm surficial SOC increases. In order to assert that C is being sequestered in the soil, the whole-soil profile must be considered. It is recommended that future research into SOC sequestration be conducted from a whole-plant/whole-soil perspective in a soil genesis context using the following strategies. Mine the Literature. Most of the literature needed to provide the requisite whole-plant/whole-soil perspective and soil genesis context is scattered and not organized, summarized, or synthesized in the current SOC sequestration literature. The evolution of SOC sequestration research has been a narrowing of perspective away from the more holistic whole-plant/whole-soil perspective of the foundational agronomic literature to the perspective of the near-surface soil layer. This vast foundational literature needs to be located, restored, and incorporated with the current literature on crop rhizosphere and C and nutrient cycles throughout the whole-soil profile, soil genesis, soil fertility, subsoil amelioration, and other literatures to be organized, summarized, and synthesized into the SOC sequestration literature. Long-term Whole Plant/Whole Soil Monitoring and Assessment. Assessment of the effects of agronomic practices on SOC must be expanded to include the whole-soil profile. Improved estimates of presettlement soil SOC contents are needed to better assess SOC loss and SOC sequestration potential of Illinois' prairie and forest soils. The magnitude and swiftness with which natural factors govern SOC contents need to be better identified and quantified while incorporating a more comprehensive definition of soil aging along with consideration of presettlement and postsettlement anthropogenic landscape management practices as soil-forming factors. SOC Sequestration Research. Finally, research on how agronomic practices can increase SOC throughout the soil profile needs to be conducted from a whole-plant/whole-soil perspective in a soil genesis context. This report indicates that the optimal way to sequester SOC is to convert land back to native prairie, burn frequently, add fertilizers, and remove anthropogenic surface and subsurface drainage. Such an approach is not practical. Constraints on optimizing cropland SOC sequestration include: 1) the need to maintain good soil drainage in Illinois soils for timely spring planting that allows for growth of long-season corn hybrids and soybean varieties; and 2) maintaining soil-nutrient levels that do not result in water-quality issues. Within these constraints, the authors hypothesize that SOC sequestration can best be done by 1) developing balanced soil-fertility programs and other agronomic practices that restore soil nutrients to levels optimum for plant growth, promote movement of plant nutrients throughout the root zone using organic and/or inorganic carriers, and promote deep rooting of plants with minimal mechanical disturbance of the soil by tillage; and 2) developing chemical pest control programs that minimize the effects of pesticides on soil bacteria, and microfauna and macrofauna, thus promoting conversion of biomass to SOC, pedoturbation and net movement of SOC through the soil profile, and creation of soil structure and aggregation that optimize biomass production and conversion to stabilized SOC. Research on the development of these practices must include evaluation of nutrient movement into ground and surface waters. Losses of SOC have occurred on the order of the century time scale. SOC sequestration and the measure of its success (permanence of SOC sequestration) are also necessarily measured on the order of the century time scale. Therefore, long-term (20- to 30-year) agronomic SOC sequestration research at both the farm and individual plot level needs to be designed and conducted for hypothesis and model testing, as well as evaluation of the permanence of SOC in the surface and whole-soil profile. Even longer term research needs to be designed and conducted for hypothesis refinement and for monitoring.
		Date Created:	9 24 2004
		Agency ID:	CR-2003-02
		ISL ID:	000000000902 Original UID: 999999994351 FIRST WORD: Identification

1218:		Title:	Temporal distribution of midwestern precipitation during the 20th century
		Volume/Number:	2003
		Issuing Agency:
		Description:	Temporal fluctuations in the annual and summer precipitation across the Midwest during the 1898-2002 period are defined and described. Precipitation amounts were assessed for 15-year periods to show how patterns of precipitation have shifted spatially over the 20th Century. The early part of the century featured near average precipitation conditions, followed by predomi-nately dry conditions from 1928 through 1957. For example, during 1928-1942, 96 percent of the Midwest had below average precipitation. After 15 years with near average conditions from 1958 to 1972, extremely wet conditions developed during 1973-2002, with 91 percent of the Midwest experiencing above average precipitation. Extreme precipitation values sampled during each 15-year period revealed temporal differences with much more extreme amounts during wet and dry periods than during near average periods. Annual totals reflected the long-term variations in summer rainfall, revealing the importance of summer rainfall in determining annual amounts. Regionally, amounts were below average more frequently in the southern Midwest than in the central and northern Midwest. Values were above average more frequently in the northern Mid-west than in the central and southern Midwest. The results provide information that should be useful for hydrologic and agricultural planning and assessments.
		Date Created:	9 24 2004
		Agency ID:	DCS-2003-01
		ISL ID:	000000000903 Original UID: 999999994402 FIRST WORD: Temporal

1219:		Title:	Two record rainstorms during August 2002 in the Midwest.
		Volume/Number:	2003
		Issuing Agency:
		Description:	Two August 2002 rainstorms, one centered in Illinois and Indiana on August 18-19, and one in Iowa, Illinois, and Wisconsin on August 21-22, created record-setting point rainfalls of >10 inches and >12 inches, respectively. Return intervals of both storms' heavy rain amounts for 3-, 6-, and 12- hour durations exceeded once in 100-year values. Storm characteristics were similar to those of 36 past rainstorms during 1951-2001 that also were investigated in comparable detail. The similarities included the fact that most of the rain fell over 8 hours at night, storm areas were oriented west-east, and the region with >2 inches covered more than 9,000 square miles. Synoptically, conditions were similar to those of most past rainstorms: the storms developed south of an west-east-oriented front, precipitable water values were exceptionally high, >1.7 inches, and the frontal position and low-level jet stream proximity led to training of thunderstorms along the same path. However, the August 2002 rainstorms were different than past rainstorms in that the two storm events occurred just 2.5 days apart and in relatively adjacent areas. No other major past storms had occurred in such close time proximity. Both storms occurred where the prior 2.5-month rainfall was much below normal, creating much below normal soil moisture and droughtlike conditions for crops. All 36 previous major assessed rainstorms occurred after prolonged periods of average to much above average rainfall. This pre-storm difference in moisture conditions greatly affected the storms' impacts, and both August storms produced small economic losses compared to those of comparable prior storms. A much greater percentage of total storm rainfall infiltrated the soil, resulting in less runoff. High early peak flows in rivers where the heaviest rain fell quickly returned to normal levels within 10-22 days. Flooding, mostly near river courses, quickly dissipated, and flood losses were minimal. The major economic impact of the two August storms related to the added soil moisture and, in turn, the positive effects on soybean crops. Soybeans were in the pod-filling stage and shy of soil moisture when the storms occurred, and the rain-filled soils led to increased yields valued at $51 million in Illinois and Iowa.
		Date Created:	9 24 2004
		Agency ID:	DCS-2003-02
		ISL ID:	000000000904 Original UID: 999999994405 FIRST WORD: Two

1220:		Title:	Groundwater conditions of the principal aquifers of Lee, Whiteside, Bureau, and Henry counties, Illinois.
		Volume/Number:	2004
		Issuing Agency:
		Description:	Groundwater Conditions of the Principal Aquifers of Lee, Whiteside, Bureau, and Henry Counties, Illinois by Stephen L. Burch A large supply of groundwater occurs in a buried aquifer lying in the bedrock valley of the ancestral Mississippi River. This deposit, known as the Sankoty sand, supplies many irrigation wells and underlies more than 750 square miles (sq mi). A shallower and less extensive aquifer, the Tampico, occurs near the surface and underlies more than 480 sq mi. This study defines the regional groundwater flow patterns for these two aquifers in northwestern Illinois and reports the results of measuring groundwater levels in observation wells. The Tampico aquifer is separated from the underlying Sankoty aquifer by an intervening layer of clay or clays. Groundwater within the upper unit exists under unconfined conditions (that is, at atmospheric pressure). The saturated sands comprising the Tampico aquifer are typically 30 to 40 feet thick and are tapped by shallow wells or sandpoints. The Sankoty sand is 100 to 150 feet thick and is commonly used in irrigation wells in Illinois. Groundwater within this unit is pressurized and occurs under confined conditions. The pressure head in the aquifer declines from an elevation of about 670 feet near the town of Ohio to less than 570 feet near Albany along the Mississippi River. A steeper gradient occurs as groundwater flows toward a second outlet near Hennepin. As a result, groundwater elevations decline to levels below 450 feet where the aquifer discharges to the Illinois River. Pumpage during the summer months, largely from irrigation wells, causes groundwater levels in the Sankoty aquifer to decline 11 to 13 feet. The area of greatest drawdown extends from Tampico to Walnut, Illinois. Groundwater levels in the Tampico aquifer do not decline as much. A decline of 3 to 3.5 feet is common in the aquifer's water table. Irrigation wells annually withdraw an estimated 21,000 acre-feet of groundwater. Although the Sankoty aquifer is favored for irrigation, the actual distribution percentage for each aquifer is unknown. No significant, regional water-quality problems were detected in samples collected from either aquifer. The groundwater in both aquifers is of a calcium-bicarbonate type. The water is very hard, with an average value of 306 milligrams per liter (mg/L) in the Sankoty aquifer and 329 mg/L in the overlying Tampico aquifer. The quality of samples from the Sankoty aquifer was excellent, although they contained more iron and are more alkaline than samples from the Tampico aquifer. No discernible patterns were observed in the distribution of total dissolved solids (TDS) values for either aquifer. The average TDS value for water samples was 435 mg/L (Tampico aquifer) and 363 mg/L (Sankoty aquifer). Groundwater in the Tampico aquifer was usually of excellent quality, but it sometimes contained nitrates.
		Date Created:	12 8 2004
		Agency ID:	DCS-2004-01
		ISL ID:	000000000905 Original UID: 999999994435 FIRST WORD: Groundwater

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