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TGR Meeting Information

Regular Board Meeting and Public Hearing on District Rules

Date: 9:30 am on Thursday, December 14, 2023

Location: Helotes City Hall Council Chambers, 12951 Bandera Rd., Helotes, TX 78023

*See proposed District Rules here and on the Rules & Forms Page

*See an Overview of Highlights on the Rules here

*Posted November 6, 2023

*Newspaper Notice

Trinity Glen Rose District Precinct Map
Use the map to determine which precinct you live in

Dr. Stuart Birnbaum

Precinct 1

Joe duMenil

Precinct 2

Steven Peterson

Precinct 3

Joe Silman

Precinct 4

Katrina Waring Castillo

Precinct 5

Use the map to locate your District when using Google Chrome, Mozilla Firefox, and Microsoft Edge. 

For Safari users, click here to determine the District in which you reside.
Trinity Glen Rose District Board Members
Stuart Birnbaum.jpeg

Dr. Stuart Birnbaum

Precinct 1


Joe duMenil.jpeg

Joe duMenil

Precinct 2


Steve Peterson blue background 2.jpg

Steven Peterson

Precinct 3

Asst. Sec./Treasurer

Joe Silman.jpg

Joe Silman

Precinct 4



Katrina Waring Castillo

Precinct 5

Dr. Stuart Birnbaum - Precinct 1 (Vice-Chair) - Term expires 05/2024

Dr. Stuart Birnbaum is elected representative and was appointed to the TGR Board in December 2020 and took his oath of office in January. He will be finishing out the three-year term of office formerly held by Abigail Bush. Birnbaum is an emeritus associate professor in the department of geological sciences at the University of Texas at San Antonio where he conducted research in sedimentology and microbial geochemistry. He earned his B.S. degree in geology from the State University of New York at Stony Brook and his Ph.D. in geology from Cambridge University in the UK. 

Since retiring Birnbaum has been actively engaged with Citizens’ Climate Lobby serving as a co-leader of the San Antonio chapter of CCL. He is also a Board member of the Scenic Loop – Helotes Creek Alliance, a local environmental organization, and is an En-ROADS ambassador with Climate Interactive.

Precinct 1 boundaries cover the area near the City of Helotes. See the map above.

Joe duMenil - Precinct 2 (Board Chairman) - Term expires 05/2024

Joe duMenil is the elected representative and currently serves as the Board Chairman. He has served the District since April 2011. Mr. duMenil has over 45 years of experience in the development and management of public infrastructure. He gained his experience by serving 20 years in the U.S. Army Corps of Engineers and over 25 years in both public and private sectors. He currently is assisting Doucet, a Kleinfelder Company in their business development pursuits in Central Texas.


He brings to the District a vast knowledge of local issues and relationships with local governmental entities. Mr. duMenil has a unique quality that allows him to connect with both individuals and community groups. He is a respected and trusted resident of the City of Fair Oaks Ranch since 2005. His successful career and tenure on the Board is based on communication, cooperation and collaboration, each being essential elements in the efficient stewardship of public monies and the pursuit of the District mission.


Precinct 2 encompasses the largest geographic area in District with the western boundaries being Highway 16 in the Helotes area, Camp Bullis on the east, Loop 1604 in the south and the Bexar County line to the north. This Precinct also extends into Kendall and Comal Counties within the City Limits of Fair Oaks Ranch. Also included in the Precinct 2 boundaries are the City of Grey Forest, a portion of the City of Helotes, numerous residential and commercial communities and the environmentally protected Government Canyon Nature Park.


He holds a B.S. degree in Construction Science and a M.S. degree in Construction Management from Texas A&M University. Mr. duMenil has been a Certified Floodplain Manager since 2002 and is actively involved in several professional organizations such as Texas Floodplain Management Association, Society of American Military Engineers, Texas Public Works Association, Construction Management Association of America and American Council of Engineering Companies.

Steven Peterson - Precinct 3 (Asst. Sec./Treasurer) - Precinct 3 term expires 05/2026

Steven Peterson is a native San Antonian residing in Kinder Ranch. He is a graduate of Texas A&M and served in the San Antonio Police Department for 34 years. He is currently working as a City of San Antonio District 10 Director of Neighborhood Engagement and Military Affairs. Peterson is filling a vacant TGR precinct seat and will have to run for that office in May of 2024 according the TGR rules. The precinct 3 seat will then be up for election in May 2026 according to the current board election rotation.


The largest development in Precinct 3 is Timberwood Park, where the lot sizes are larger than the typical home-sites. Camp Bullis and Camp Stanley cover most of the western portion of the district. Timberwood can be found on the east. The southern boundary runs up against the Stone Oak area and the Cibolo Creek forms most of the northern boundary. 


Eisenhauer Park is a highly used urban park in Precinct 3, and Panther Springs Creek Nature Area is a family friendly park residing in the district.


A unique aspect of Precinct 3 is that three creeks, Leon, Salado, Panther Springs, run through the area. These tributaries are often included in water quality discussions due to their potential recharge to the aquifers which underlie them.

Joe Silman - Precinct 4 (Treasurer) - Term expires 05/2026

Joe Silman is a retired partner with Andersen Consulting (now Accenture) and he focused his business consulting with water, electric and gas utilities. In addition to serving on the TGRGCD board, Silman also is President of the Stone Oak POA Board of Directors.


Precinct 4 is the most densely populated in the TGRGCD.  It includes the growing Stone Oak area with its 27 subdivisions, plus robust business and medical developments. Additionally, the Club at Sonterra and Martin Marietta Hwy 281 quarry are located within Precinct 4. The southern boundary of Precinct 4 is Loop 1604, Wilderness Oak on the north, NW Military Highway to the west and Highway 281 on the east.


Silman knows that with many homes and large water using businesses in the area, water conservation must be a high priority for all who receive their water from either San Antonio Water System Edwards Aquifer or Trinity Glen Rose wells. In the coming months, the TGRGCD will be enhancing its conservation messaging to encourage the focused stewardship of the area's water resources.

Katrina Waring Castillo - Precinct 5 (Secretary) - Term expires 05/2024

The Trinity Glen Rose District Board recently appointed Katrina Waring Castillo for the Precinct 5 board position recently vacated by Jerry Forster. Castillo has more than 25 years of experience in Information Technology leadership, data management, program management and application development.  She currently leads the Central Texas Data & Analytics practice for Slalom which is a world-renowned consulting company with 13,000 consultants.

The TGR Board are elected positions. Castillo will have to run for re-election as Forster’s current term expires in less than two years.

Precinct 5 is located on the eastern reach of the Trinity Glen Rose District. It is the second largest precinct in geographic size and has a highly faulted underground structure. 

The recently developed PGA Village Golf Course and Marriott Resort are two of the more recognizable destinations in D5. Those developments occurred under high scrutiny from the public and have proven to be good environmental neighbors to the area.


The Vulcan Quarry mines limestone in northern Bexar County and is subject to various environmental regulations due to its proximity to recharge features and aquifer water.

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