Tier I Site Assessment Form
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Tier I Site Assessment Main CSJ: 0015-09-186 and 0015-09-187 Form Prepared By: Nick Wallisch, Blanton & Associates Date of Evaluation: November 18, 2020 Proposed Letting Date: August 2022 Project not assigned to TxDOT under the NEPA Assignment MOU District(s): Austin County(ies): Williamson Roadway Name: I-35 Limits From: North of SE Inner Loop Limits To: South of RM 1431 Project Description: The Texas Department of Transportation (TxDOT) Austin District is proposing improvements along approximately 4.4 miles of existing Interstate Highway 35 (I-35) in the cities of Georgetown and Round Rock, Williamson County, Texas (Figures 1 and 2). The proposed project is on I-35 from north of Southeast (SE) Inner Loop to south of Ranch-to-Market (RM) 1431. Please refer to the TxDOT Project Description Report in ECOS for complete project details. The proposed Ready-to-Let date for this project is August 2022 and the Letter of Authority date is July 2022. The environmental review, consultation, and other actions required by applicable Federal environmental laws for this project are being, or have been, carried-out by TxDOT pursuant to 23 U.S.C. 327 and a Memorandum of Understanding dated December 9, 2019, and executed by FHWA and TxDOT. 1. No Is the project limited to a maintenance activity exempt from coordination? http://txdot.gov/inside-txdot/division/environmental/maintenance-program.html 2. No Has the project previously completed coordination with TPWD? 3. Yes Is the project within range of a state threatened or endangered species or SGCN and suitable habitat is present? *Explain: The proposed project contains potential habitat for two federally and state-listed threatened species, the Georgetown salamander (Eurycea naufragia), and Jollyville Plateau salamander (Eurycea tonkawae), and two federally endangered species classified by the state as Species of Greatest Conservation Need (SGCN), the Bone Cave harvestman (Texella reyesi), and Coffin Cave mold beetle (Batrisodes texanus). The project area also contains potential habitat for an additional 22 SGCN: Strecker's chorus frog (Pseudacris streckeri), southern crawfish frog (Lithobates areolatus areolatus), Woodhouse's toad (Anaxyrus woodhousii), western burrowing owl (Athene cunicularia hypugaea), American badger (Taxidea taxus), big brown bat (Eptesicus fuscus), eastern spotted skunk (Spilogale putorius), long-tailed weasel (Mustela frenata), Mexican free-tailed bat (Tadarida brasiliensis), southern short-tailed shrew (Blarina carolinensis), tricolored bat (Perimyotis subflavus), western hog-nosed skunk (Conepatus leuconotus), eastern box turtle (Terrapene carolina), slender glass lizard (Ophisaurus attenuatus), Texas garter snake (Thamnophis sirtalis annectans), timber (canebrake) rattlesnake (Crotalus horridus), western box turtle (Terrapene ornata), bigflower cornsalad (Valerianella stenocarpa), gravelbar brickelbush (Brickellia dentata), plateau milkvine (Matelea edwardsensis), Texas almond (Prunus minutiflora), and Wright’s milkvetch (Astragalus wrightii). Form 300.02.FRM TxDOT Environmental Affairs Division Version 4 Effective Date: December 2019 0015-09-186 and 0015-09-187 Page 1 of 6 Tier I SIte Assessment The South Fork San Gabriel River is less than one mile north of the project area and could provide suitable habitat for the Georgetown salamander and Jollyville Plateau salamander. The TxDOT-TPWD BMP Programmatic Agreement (PA) (revised in 2017) does not include BMPs for these two species. Formal consultation with USFWS is being conducted to assess effects on these species. Meadows, pasturelands, and floodplains within the project area could provide suitable habitat for the southern crawfish frog. Amphibian BMPs will be implemented to minimize impacts to the species. Wooded floodplain could provide suitable habitat for the Strecker's chorus frog, and less disturbed portions of the project area could provide habitat for Woodhouse's toad. Culverts and open areas could provide suitable habitat for western burrowing owl. Bird BMPs will be implemented to minimize impacts to the species. Caves and undiscovered voids could provide suitable habitat for the Bone Cave harvestman and Coffin Cave mold beetle. The TxDOT-TPWD BMP PA does not include BMPs for these two species. Formal consultation with USFWS is being conducted to assess effects on these species. Open fields and woodlands in the project area could provide suitable habitat for the eastern spotted skunk. Contractors will be advised of potential occurrence of the species in the project area, to avoid harming the species if encountered, and to avoid unnecessary impacts to dens. Grasslands and other open areas could provide suitable habitat for the American badger. Wooded floodplain or other wooded areas could provide suitable habitat for the big brown bat, long-tailed weasel, southern short-tailed shrew, tricolored bat, and western hog-nosed skunk. Caves near the project area could provide suitable habitat for the Mexican free-tailed bat and tricolored bat. Moist areas could provide suitable habitat for the Texas garter snake. Areas of wooded floodplain could provide suitable habitat for the timber (canebrake) rattlesnake. Terrestrial Reptile BMPs will be implemented to minimize potential impacts to these species. Areas of wooded floodplain could provide suitable habitat for the eastern box turtle. Dry grassy areas could provide suitable habitat for the slender glass lizard. Pastures and fields could provide suitable habitat for the western box turtle. Drainages in the project area could provide suitable habitat for bigflower cornsalad and gravelbar brickelbush. Oak-juniper woodlands could provide suitable habitat for the plateau milkvine. Grasslands could provide suitable habitat for the Texas almond and Wright's milkvetch. The BMP PA does not include BMPs for plant species. The BMP PA does not include approved BMPs for invertebrate or plant species, or for species that were added to TPWD county lists in April 2019 (Strecker's chorus frog, Woodhouse's toad, American badger, big brown bat, long- tailed weasel, Mexican free-tailed bat, southern short-tailed shrew, tricolored bat, western hog-nosed skunk, western spotted skunk, eastern box turtle, slender glass lizard, and western box turtle). See the attached Species Analysis Spreadsheet for more information about impact determinations. The proposed project would have no impact on any SGCNs not mentioned above, as determined by a qualified biologist. See the attached NDD table for a list of reported observations within 1.5 and 10 mile buffer zones of the project area. Date TPWD County List Accessed: August 25, 2020 Date that the NDD was accessed: September 3, 2020 What agency performed the NDD search? TPWD No Does the BMP PA eliminate the requirement to coordinate for all species? Comments: The proposed project contains suitable habitat for two state-listed endangered species, two state- listed threatened species, and 22 SGCN. BMPs are available and would be implemented for the southern crawfish frog, western burrowing owl, eastern spotted skunk, Texas garter snake, and timber (canebrake) rattlesnake. However, the TxDOT–TPWD BMP PA (revised 2017 version) does Form 300.02.FRM TxDOT Environmental Affairs Division Version 4 Effective Date: December 2019 0015-09-186 and 0015-09-187 Page 2 of 6 Tier I SIte Assessment not have specific BMPs for Strecker's chorus frog, Woodhouse's toad, Georgetown salamander, Jollyville plateau salamander, Bone Cave harvestman, Coffin Cave mold beetle, American badger, big brown bat, long-tailed weasel, Mexican free-tailed bat, southern short-tailed shrew, tricolored bat, western hog-nosed skunk, western spotted skunk, eastern box turtle, slender glass lizard, western box turtle, bigflower cornsalad, gravelbar brickelbush, plateau milkvine, Texas almond, and Wright’s milkvetch; therefore, coordination with TPWD is required for potential impacts to these species. Surrogate BMPs will be utilized for those species not included in the PA (i.e. Amphibian BMPs for Strecker’s chorus frog and Woodhouse's toad, Terrestrial Reptile BMPs for eastern and western box turtles and slender glass lizard; and for the American badger, long-tailed weasel, southern short-tailed shrew, western hog-nosed skunk, and western spotted skunk, contractors will be advised of the potential occurrence of the species in the project area, and to avoid harming the species if encountered, and to avoid unnecessary impacts to dens). 4. No NDD and TCAP review indicates adverse impacts to remnant vegetation? 5. No Does the project require a NWP with PCN or IP by USACE? Comments: It is expected that any proposed work that would impact potential waters of the U.S. would be authorized by the U.S. Army Corps of Engineers under Nationwide Permit (NWP 14) Linear Transportation Projects, a PCN may be needed. 6. No Does the project include more than 200 linear feet of stream channel for each single and complete crossing of one or more of the following that is not already channelized or otherwise maintained: Comments: The proposed project does not include 200 linear feet of channel realignment or stream bed/bank excavation. 7. No Does the project contain known isolated wetlands outside the TxDOT ROW that will be directly impacted by the project? Comments: The proposed project would not impact known isolated wetlands outside of the TxDOT ROW. 8. No Would the project impact at least 0.10 acre of riparian vegetation? Comments: The proposed project would not impact riparian vegetation. 9. Yes Does