Res 2022-085R/Authorizing a change in Service to the agreement with Lockwood and Andrews & Newman Contract 218-307 related to Puegatory crrek improvements amount approx $65,906.25 for additional Archelogical field work.

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March 18, 2022 John Espinoza, PE, CFM City of San Marcos 630 E Hopkins San Marcos, Texas 78666 Lockwood, Andrews & Newnam, Inc. A LEO A DALY COMPANY Re: Environmental Permitting for Phase 2 of Purgatory Creek Improvements Project - Proposal for Supplemental Environmental Services (existing contract # 218-307) Dear Mr. Espinoza: LAN is pleased to present this proposal to provide supplemental environmental permitting support. This scope of services builds from the prior environmental supplemental for the City of San Marcos Purgatory Creek Channel Improvements Project, Phase 2, dated April 29, 2020; more specifically Task 3, Compliance with Section 106 of the National Historic Preservation Act and Task 4, Compliance with the Antiquities Code of Texas. In addition, the U.S. Army Corps of Engineers (USACE) has indicated that an Approved Jurisdictional Determination (AJD) should also be completed for this project. This was identified as a supplemental Task 8 in the prior Scope of Services. In response to the USACE request, it is now included in this supplemental Scope of Services. The need for supplemental archeological services was identified from written review comments of the proposed Cultural Resources Scope of Work from Mr. James Barrera of the USACE on July 22, 2021, and a subsequent follow-up web conference with Mr. Barrera on August 11, 2021. These additional services are described below. Per request by the City of San Marcos, additional investigation utilizing metal detection requested by Mr. Barrera is presently not included in these supplemental services. Such services can be conducted later at such time as the specific design features for Phase 2 are identified and funding is available. Supplemental archeological field work will be completed to satisfy USACE comments as follows: backhoe trench excavations, including archeological site delineations, within the Phase 2 area of potential effect (APE). During these investigations, backhoe trenches will be examined to describe the exposed soil profile/stratigraphy in detail to assess landform and archeological site development and integrity. In turn, this will allow for an evaluation of the potential of the APE and individual archeological sites to contain significant archeological deposits warranting inclusion in the National Register of Historic Places (NRNP) or State Antiquities Landmark (SAL) designation. In addition to these activities, the USACE requested that increased sampling intensity of shovel test excavations across the APE be performed given the presence of a segment of the EI Camino Real National Historic Trail that has been mapped as traversing portions of the APE. Also, increased trenching sampling was requested by the USACE near previously recorded NRHP-eligible site 41HY163 to determine if it extends into the APE, as well as within and adjacent to previously recorded site 41HY55 recorded during previous investigations for the Purgatory Creek Channel Improvements project. The task will include the archeological and geoarcheological field investigations, as well as preparation of a documentation report. 407 S, Stagecoach Drive, Suite 207 • San Marcos, Texas 78666 • 512.396.4040 - Fax: 512.396.4064 • www.lan-inc.com