Expansive soils cause more damage to structures annually than a combination of other major natural disasters. Because of the cost to our society, all means and methods need to be fully explored to mitigate the problems associated with expansive soils. This study will present a foundation design approach that is under utilized in this application, driven piles. The main objective of the study is to present pile test results and analysis from four driven pile project sites in three types of expansive soils found in central Texas: Del Rio formation, Taylor/Navarro formation, and expansive alluvium. Observations of the pile driving operations will be reported to highlight pile design considerations like predrilling and open versus close-ended pipe piles and the type of equipment involved. High strain dynamic pile tests were conducted on each of the four studies with rigorous signal matching analysis from the CAse Pile Wave Analysis Program (CAPWAP). Ultimate pile capacities ranged from 73 to 311 kips with an average of 61% of the total capacity coming from the pile shaft and were two to six times the structural capacity needed. Static design methods under-predicted, dynamic formulas over-predicted, and wave equation analysis conducted with GRLWEAP closely modeled test results. Average unit skin frictions ranged from 0.55 to 4.7 ksf. Restrike pile tests of 1 to 17 days after initial driving reported 30 to 100% shaft capacity gain. All open-ended pipe piles driven produced soil plugs ranging from 4 to 14 feet thick, and it was observed that harder driving conditions produced thinner soil plug thicknesses. Small diameter, thick-walled, open-ended pipe piles reached penetration of twice the depth of designated zone of seasonal moisture change without problem. The observed production rate of the driven piles was on average 8 minutes which implied daily production of 15 to 40 piles. Predrills or augered holes should be specified for underground obstructions found in soil investigation. Future studies on pile-supported foundations should measure localized movement correlated with seasonal moisture changes in expansive soil, or active zone, to confirm long-term performance. Also uplift forces need to be observed from tests on fully-instrumented and loaded driven piles to determine required pile embedment length below the active zone to withstand movement. / text

The population of central Texas is increasing rapidly, and urbanization and suburban development continue amid projections of unprecedented growth to come. How is this affecting the expanses of rich agricultural land and remaining scraps of Blackland Prairie upon which the agricultural industry of east central Texas was built? State Highway 130 is partially complete – providing an urban-area bypass intended to alleviate traffic on I35 between San Marcos and Georgetown. In view of the building of this new transit and development corridor to the east of I35, on the eastern edge of Austin, what can be done to preserve agriculture and native prairie on Austin’s urban fringe? In this PR, I examine this question in terms of two essential components: growth management and land conservation. There are numerous studies on the structures and efficacies of growth management tools and of land conservation strategies, but there is little discussion of the role of growth management in relation specifically to urban and urban-fringe agriculture. I begin with a literature review, surveying the current state of study and practice with regard to growth management and open space & agricultural land conservation. This is followed by a case study of state-level open space conservation policy in Georgia, from which I draw lessons relevant to my case. The next step is to frame the potential management and conservation policies presented win the literature review and case study within the context of local practices, thus narrowing the focus of analysis to the confines of my study area: an approximately 20-mile wide, 58-mile long corridor along a portion of SH130. To gauge the possibilities for management and conservation within the study area, I have produced a matrix of jurisdictions and policy options, and an inventory of vacant land. Using the matrix I analyze, on the one hand, the relevant legal codes available to each jurisdiction, and on the other hand, local attitudes toward growth and agriculture. The land inventory is a graphic presentation – through GIS mapping – of factors critical to the potential preservation of open space. The final operation is to sketch a larger proposal within which this study would fit as a preliminary step. Here I suggest an implementation plan, based on the Envision Central Texas model, and recommend directions for future research. / text

The foreign-born population in the United States increased by 57% from 1990 to 2000 (U.S. Census, 2003). A substantial growth for minority and immigrant population groups is projected to continue over the next 20 years, and these newcomer students tend to have lower measures of achievement (National Center of Education Statistics, 2007). Most of the research available is for early grade students. A paucity of research exists for high school student newcomers. This study reviewed a single public high school as a case study in a Central Texas school district, focusing on newcomer immigrant students in Grades 9 and 10. This study adds to the understanding of educational needs for new immigrants, existing educational services for them, strategies in place to narrow the achievement gaps between immigrant and nonimmigrant students, and policies that should be developed or expanded in order to ameliorate their educational conditions. Research questions were (a) what are the achievement gaps between 9th-grade, newcomer immigrant students in Central Texas and their nonimmigrant peers; (b) what are the academic needs of 9th-grade, newcomer immigrant students in Central Texas; and (c) what strategies exist to narrow the achievement gaps between immigrant and nonimmigrant students? Evidence was found that indeed a subpopulation of immigrant teenagers arrives with significant gaps in schooling. This study revealed value in innovative, visual instructional techniques; encouraged development of interpersonal advocacy; and the most potent contribution, thoughtful and empathetic administration and teachers. Determining effective strategies, support systems, and appropriate school climate while finding other elements that work in other locations make for a successful school for newcomer immigrant students. / text

This thesis is a participant observer case study that examined how three primary intervening variables (resources, trust, and risk communication) influenced the amplification and attenuation of perceived risk during a regulatory permitting process. The objective was to better understand the role of risk perception in a water policy decision, the issuance of a permit by the Texas Commission on Environmental Quality to the Waco Metropolitan Regional Sewerage System permitting them to discharge 1.5 million gallons of waste water effluent a day into Bull Hide Creek. The study took place between March 2008 and October 2009. The plant, designed to serve the sewer needs of distant cities, was planned without the participation of the residents of the creek community. After being notified of the permit application, they organized to protest the issuance of the permit which they felt presented a serious risk to their community. It is the conclusion of this researcher that risk perception played a key role delaying the issuance of the permit and construction of the plant. When perceived risk attenuated to a mutually acceptable level for all stakeholders, the permit was issued. It is postulated that if risk perception is recognized as a significant factor in potentially controversial urban and regional planning and policy decisions, implementation may be less difficult. The validity of this conclusion is constrained due to the fact this was a single case study and generalization is limited.

This dissertation looks at online and offline car culture in Central Texas. The online car culture observed is on Internet car forums and other Internet sources for car enthusiasts. Offline car culture deals with various types of car events around the central Texas area. These events include, but are not limited to, car shows, street races, and street meets. Cultural practices were observed in both types of environments and are analyzed by using hybridity theory, gender analysis and race analysis. / text

Heightened industry focus on the Upper Cretaceous (Cenomanian-Turonian) Eagle Ford has resulted from recent discoveries of producible unconventional petroleum resource in this emerging play. However, little has been published on the facies and facies variabilities within this mixed carbonate-clastic mudrock system. This rock-based study is fundamental to understanding the controls, types, and scales of inherent facies variabilities, which have implications for enhanced comprehension of the Eagle Ford and other mixed carbonate-clastic mudrock systems worldwide. This study utilizes 8 cores and 2 outcrops with a total interval equaling 480 feet and is enhanced by synthesis of thin section, XRD, XRF, isotope, rock eval/TOC, and wireline log data. Central Texas Eagle Ford facies include 1) massive argillaceous mudrock, 2) massive argillaceous foraminiferal mudrock, 3) laminated argillaceous foraminiferal mudrock, 4) laminated foraminiferal wackestone, 5) cross-laminated foraminiferal packstone/grainstone, 6) massive bentonitic claystone, and 7) nodular foraminiferal packstone/grainstone. High degrees of facies variability are observed even at small scales (50 ft) within the Eagle Ford system and are characterized by pinching and swelling of units, lateral facies changes, truncations, and locally restricted units. Facies variability is attributed to erosional scouring, productivity blooms, bottom current reworking, and bioturbation. At the 10-mile well spacing scale and greater, the data significantly overestimates intra-formational facies continuity but is successful in defining the following four-fold stratigraphy: The basal Pepper Shale is an argillaceous, moderate TOC, high CGR and GR mudrock. The Waller Member is a newly designated name used in this study for an argillaceous and foraminiferal, high TOC, massive mudrock with a generally moderate CGR and GR profile. The Bouldin Member is a high energy, carbonate-rich (foraminiferal), low TOC, low and variable CGR but high GR zone. Finally, the South Bosque Formation is an argillaceous and foraminiferal, moderate TOC, massive and laminated mudrock with a moderate CGR and GR signature. GR logs alone are inadequate for determination of facies, TOC content, depositional environment, and sequence stratigraphic implications. Using integrated lithologic, isotopic, and wireline log data, cored wells in the study area are correlated across the San Marcos Arch. Geochemical proxies (enrichment in Mo, Mn, U, and V/Cr) indicate that maximum basin restriction occurred during deposition of the Bouldin Member. Bottom current activity influenced depositional processes and carbonate sediment input was driven by water column productivity. These primary controls on Eagle Ford stratigraphy and character are independent from eustatic fluctuation, rendering classical sequence stratigraphy unreliable. / text

Ecosystem services are the aspects of the environment utilized to produce human well-being and are key elements of landscape sustainability. Increasingly, measures of ecosystem services are being incorporated into conservation decision making. However, a framework for evaluating systematic conservation planning ranked selection scenarios with indicators of ecosystem services has not been developed. Using the Central Texas counties of Blanco, Burnet, Hays, Llano, San Saba, and Travis as a study, a suite of spatially explicit modeling tools, Integrated Valuation of Ecosystem Services and Tradeoffs (InVEST), are used to quantify carbon storage, soil conservation, and water provision. A fourth service metric, ecosystem richness, is derived using Texas Parks and Wildlife ecological systems classification data. The values of these four services are then used to evaluate four conservation scenarios, developed in conjunction with a local conservation non-profit, Hill Country Conservancy (HCC), and derived using Marxan decision-support software. The evaluation process consists of both geographic information system (GIS) and statistical analysis. GIS based overlay analysis is used to identify areas of multiple ecosystem service overlap. Spearman correlation tables are used to test the spatial relationship among ecosystem services, as well as the relationship among each of the four conservation scenarios. Wilcox-Mann-Whitney U tests (WMW) are used to assess the statistical significance of each scenario’s ecosystem service values as compared to the values of a random control scenario. The results of this work reinforce the findings that there is often significant variability in the spatial congruence of multiple ecosystem services and their provision across a landscape. This work also supports the conclusion that the targeting of ecological phenomena for conservation concurrently targets areas supporting multiple ecosystem services. More distinctively, the results verify the capacity of ecosystem service indicators to effectively inform an iterative systematic conservation planning process. At the local landscape-scale, this work provides HCC with defensible support of their conservation decisions based not only on organizational priorities, but also on ecosystem service values. More broadly, this work provides a framework for evaluating conservation scenarios with spatially explicit values of ecosystem services which can be replicated across a wide range of project scales and objectives. / text

The Eagle Ford Shale and equivalent Boquillas Formation (Late Cretaceous) contain abundant volcanic ash beds of varying thickness. These ash beds represent a unique facies that displays a range of sedimentary structures, bed continuity, and diagenetic alteration. They are prominent not only in West Texas outcrops, but also in the subsurface of South Texas where hydrocarbon production is actively occurring. The ash beds have the potential to be used for stratigraphic correlation for understanding early diagenesis and — most importantly — for obtaining high-resolution geochronology, which can then be used for defining depositional rates and chronostratigraphy. Study of the ash beds was conducted at outcrops along U.S. 90, west of Comstock, Texas, the subsurface in Atascosa and Karnes County, and at a construction site in South Austin. Bed thicknesses range from 0.1–33 cm and were collected throughout the entirety of the Eagle Ford succession. Mineral separation yielded abundant non-detrital zircons for U-Pb dating. Dating was conducted using LA-ICP-MS at The University of Texas at Austin, to attain a base level understanding of the age range for the Eagle Ford. High-resolution ages for the base and top of the Eagle Ford were obtained, in addition to radioisotopically defining the Cenomanian-Turonian boundary within the section. U-Pb ages for the Eagle Ford Shale range from Early Cenomanian to Late-Coniacian near Comstock, Mid-Cenomanian to the Turonian-Coniacian boundary in the subsurface, and Early Cenomanian to Late Turonian in Austin area. These findings contrast with many of the regional biostratigraphic studies across the Eagle Ford and indicate a more prolonged period of Eagle Ford deposition than previously observed. / text

Assessment of aquatic plant selection by waterfowl has been conducted during the winters of 1997-2000 on 49 0.2-0.79 ha research ponds in north central Texas. Ponds were categorized by dominant plant species into eight habitat types. Census with waterfowl species identification were performed to investigate impacts of aquatic vegetation and water depth on waterfowl. Eighteen waterfowl species were observed. Peak migration occurred in late December/early January. Mixed native ponds and mixed native/hydrilla ponds were the most frequently selected habitat types. The study included correlation analysis between pond water levels and waterfowl use. Full ponds received greatest use followed by half full ponds, while almost empty ponds received minimal use. Time activity budgets were conducted on waterfowl utilizing mixed native and hydrilla ponds to compare waterfowl time partitioning on native aquatic vegetation versus hydrilla. Although only minor differences were found in time budgets, social status appears to be strongly related to habitat selection. Ducks on native ponds were paired (86%), conversely no ducks on hydrilla ponds were paired. Hydrilla pond although frequently utilized, were populated by lower status birds mostly single hens.

The life history of Isonychia sicca (Walsh) was elucidated from samples collected at Clear Creek from Oct. 1976-Jun. 1978, and Elm Fork of the Trinity River from Sept. 1977-Jun. 1978, Denton County, Texas. Adaptations for existence in an intermittent stream were of primary concern. Eggs are capable of diapausing through hot, dry summers and cold, wet or dry winters. Diapause is broken in the fall after rehydration and/or in the spring. I. sicca is usually bivoltine during a Sept.-Jul. wet period. Observations from Elm Fork indicate that emergence continues to Oct. if the stream remains permanent. Considerable overlap occurs between overwintering, spring, and summer populations.