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Narrative Description of Site Specific Geology for The This page intentionally left blank GEOLOGIC ASSESSMENT OF THE 183 NORTH MOBILITY PROJECT, TRAVIS AND WILLIAMSON COUNTIES, TEXAS Prepared for CP&Y 13809 Research Blvd., No. 300 Austin, Texas 78750 Attn: Mr. Andy Atlas, Vice President (512) 241-2210 on behalf of CENTRAL TEXAS REGIONAL MOBILITY AUTHORITY 3300 N IH-35, Suite 300 Austin, Texas 78705 Attn: Mr. Sean Beal, P.E., Engineering Manager (512) 996-9778 Prepared by SWCA ENVIRONMENTAL CONSULTANTS 4407 Monterey Oaks Boulevard Building 1, Suite 110 Austin, Texas 78749 Texas Board of Professional Geoscientists Firm Registration No. 50159 www.swca.com SWCA Project Number 25572-AUS July 2, 2015 Revised September 2, 2015 This page intentionally left blank. TABLE OF CONTENTS INTRODUCTION .............................................................................................................. 2 METHODOLOGY ............................................................................................................. 2 RESULTS ........................................................................................................................... 2 Site Overview.................................................................................................................. 2 Geology ........................................................................................................................... 4 Soils................................................................................................................................. 4 Site Hydrogeologic Assessment ..................................................................................... 4 REFERENCES ................................................................................................................. 10 LIST OF FIGURES Figure 1. Project Area Location Map. ................................................................................ 3 Figure 2. Stratigraphic Column within Project Area. ......................................................... 5 Figure 3a. Soil Units Map of the Northern Section of the Project Area. ............................ 6 Figure 3b. Soil Units Map of the Central Section of the Project Area. .............................. 7 Figure 3c. Soil Units Map of the Southern Section of the Project Area. ............................ 8 APPENDICES Appendix A: TCEQ Forms Appendix B: Site Geologic Map SWCA Project Number 25572-AUS 1 INTRODUCTION This narrative Geologic Assessment accompanies the Texas Commission on Environmental Quality (TCEQ) Geologic Assessment form TCEQ-0585 (Appendix A) completed for the 183 North Mobility Project (Project). This study was prepared for CP&Y and the Central Texas Regional Mobility Authority (CTRMA). Proposed Project activities involve a total of approximately 724.6 acres; 714.2 acres of existing right-of-way (ROW), 8.0 acres of proposed ROW, and 2.4 acres of existing easements, as shown in Figure 1 (Project Area). METHODOLOGY Registered professional geologists with SWCA Environmental Consultants (SWCA) conducted a field survey of the Project Area for a Geologic Assessment from September 2013 to February 2014, and on 10 October 2014 and 19 March 2015. The pedestrian survey was completed by walking parallel transects spaced approximately 50 feet apart as directed by the TCEQ in the Instructions to Geologists for Geologic Assessments on the Edwards Aquifer Recharge/Transition Zones (Rev. 10-01-04). Closer spacing was used where vegetation inhibited clear observation. All potential karst features, including depressions, holes, and animal burrows, were carefully examined for evidence of subsurface extent. A number of techniques were used for this effort, including probing with a digging implement to determine the thickness and consistency of fill material and feeling for the presence of air flow, which may indicate the presence of a sub-surface void space. Other techniques included making observations of any notable characteristics of the feature site such as the presence of various types of vegetation or a semi-circular burrow mound produced by the activities of small mammals. RESULTS Site Overview Approximately 75 percent of the Project Area is located within the Edwards Aquifer Recharge Zone. A small portion of the Project Area is located within the Edwards Aquifer Transition Zone where U.S. Highway 183 (US 183) extends east of the intersection with MoPac. Topographically, the portion of the Project Area associated with US 183 occurs atop the Edwards Plateau within an area locally known as the Jollyville Plateau area at elevations ranging between 975 and 900 feet above mean sea level. The southern end of the Project Area associated with the MoPac segment exits the plateau and occurs at lower elevations between 800 and 650 feet above mean sea level. Vegetation on the Project Area consists mostly of mowed and maintained assorted grasses within the ROW. SWCA Project Number 25572-AUS 2 Figure 1. Project Area Location Map. SWCA Project Number 25572-AUS 3 Geology The Edwards Formation is exposed at the surface within the US 183 segment of the Project Area. At the US 183 and MoPac interchange, the Project Area enters the Balcones Fault Zone (a series of geologic faults associated with the western edge of the Edwards Plateau) and eventually crosses off of the Edwards Plateau. The outcropping geologic formations for the MoPac segment of the Project Area is a mix of Edwards Formation, Walnut Formation, Austin Chalk, Buda Limestone, Eagle Ford Group, and Tributary Terrace deposits. A Stratigraphic Column is presented as Figure 2. A Site Geologic Map is presented in Appendix B. Recharge into the Edwards Aquifer primarily occurs in areas where the Edwards Group is exposed at the surface. Most recharge is from direct infiltration via precipitation and streamflow loss. Recharge occurs predominantly along secondary porosity features such as faults, fractures, and karst features (caves, solution cavities, sinkholes, etc.). Karst features are commonly formed along joints, fractures, and bedding plane surfaces in the Edwards Group. Soils Soils in the Project Area consist of nine different series of soils. Austin, Brackett, San Saba, Speck, Tarrant, Volente, and Whitewright series soils are within the hydrologic soil group “C” classification. Type “C” soils have a slow infiltration rate when thoroughly wetted. Crawford, Eckrant, Fairlie, and Georgetown series soils are within the hydrologic soil group “D” classification. Type “D” soils have a very slow infiltration rate when thoroughly wetted. Soil units are displayed on Figures 3a, 3b, and 3c. Site Hydrogeologic Assessment The likelihood of recharge from the Project Area contributing to the main body of the aquifer is thought to be low to moderate. No point source karst features were identified on site and impervious cover and fill material cover much of the site. Multiple faults cross the project site, primarily within the Transition Zone. SWCA Project Number 25572-AUS 4 Navarro and Taylor Groups, undivided; 600 feet thick Austin Group; 325-420 feet thick Upper Confining Units Eagle Ford Group; 25-65 feet thick Upper Cretaceous Buda Limestone; 40-50 feet thick Del Rio Clay; 40-70 feet thick Georgetown Formation; 30-80 feet thick Edwards Limestone; Up to 200 feet thick Edwards Aquifer Edwards Comanche Peak Formation; 80 feet thick Lower Confining Walnut Formation; Up to 120 feet thick Lower Cretaceous Lower Units Upper member of Glen Rose Limestone; 500 feet thick Note: The shaded areas represent the lithology that outcrops on the Project Area. Figure 2. Stratigraphic Column within Project Area. SWCA Project Number 25572-AUS 5 Figure 3a. Soil Units Map of the Northern Section of the Project Area. SWCA Project Number 25572-AUS 6 Figure 3b. Soil Units Map of the Central Section of the Project Area. SWCA Project Number 25572-AUS 7 Figure 3c. Soil Units Map of the Southern Section of the Project Area. SWCA Project Number 25572-AUS 8 Feature Descriptions Feature locations are displayed on the Site Geologic Map (Appendix B) and are described on the Geologic Assessment Table (Appendix A). F-1 Fault. The feature consists of an inferred fault trending approximately N25˚E as mapped by Garner and Young (1976). No evidence of this fault was observed in the field. The probability of rapid infiltration along this fault within the project is considered low due to the extent of existing impervious cover and graded developments. F-2 Cave. The feature consists of a cave, referred to as Jug Cave, which was sealed during the construction of US 183 and has been covered by construction-related soils and fill. It is considered destroyed by the USFWS (Berkhouse 2005). F-3 Fault. The feature consists of a fault trending approximately N15˚E as mapped by Garner and Young (1976). No evidence of this fault was observed in the field. The probability of rapid infiltration along this fault within the Project Area is considered low due to the extent of existing impervious cover and graded developments. F-4 This feature was omitted from this report because it lies outside the proposed ROW. F-5 Fault. The feature was omitted from this report because it lies outside the area regulated by TCEQ. The feature consists of a fault trending approximately N20˚E as mapped by Garner and Young (1976). No evidence of this fault was observed in the field. The probability of rapid infiltration along this fault within the Project Area is considered low due to the extent of existing impervious cover and graded developments. F-6 Fault. The feature was omitted from this
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