1. Lower Rio Grande Valley Low Impact Development (LID) Implementation and Education by Brianna Saenz,MS, EIT AUGUSTO SÁNCHEZ-GONZÁLEZ, M.S, CFM. Institute for Sustainable Energy and the Environment Texas A&M University-Kingsville May 18, 2016

2. Background The Arroyo Colorado has low dissolved oxygen and high bacteria levels in the tidal segment (2201) Does not currently meet the aquatic life use designated by the State of Texas and described in the TCEQ’s Surface Water Quality Standards. The Arroyo was first listed on the state’s list of impaired waters (the 303(d) List) in 1996. In response to the impairment local efforts developed a watershed protection plan (WPP) 2

3. Background The Non Point Source Program (NPS) at TCEQ and the USEPA through a federal program authorized under Section 319 of the Clean Water Act, has allocated funding for the implementation of LID demonstration projects. ISEE at Texas A&M University- Kingsville in coordination with eleven local partners was awarded with $3.7M in grants in three different grant cycles (FY 2010, FY1011, FY1012 and FY13). 3

4. Objectives Design, construct and/or amend facilities with LID features. Provide outreach and education to visitors, the community and public and private land development professionals about LID Assess the costs, functionality, and administrative elements of LID practices. Increase the use of LID practices in land development projects. Conduct water quality monitoring to assess the potential environmental impact that these LID features will have on water quality. 4

5. LID Phase I: Monte Bella Park, Brownsville 5

6. 6

7. LID Phase I: Amigos del Valle Center, San Juan TAMU-Kingsville has developed a green roof system that will meet the constrains of the project. A workgroup of experts was formed to address each element of the project: USDA TCI roofing TO plastics

8. 8 Other elements of the project Rain Harvesting System Bioswale Rain Garden

9. LID Phase I: Valley Nature Center, Weslaco 9 Stromwater treatment wetland is completed including: -Educational signage -Biofiltration device -Solar pump

10. LID Phase I: Indoor Recreation Center, La Feria 10 With initial paver pattern, erosion in the aggregate between the pavers was observed. Aggregate was changed and paver patter was also changed.

11. 11 Indoor Recreation Center, City of La Feria

12. LID Phase II: Cameron County Drainage District #1 12 The Cameron County Drainage District #1 is transforming the 45- acre tract into an educational public park. Wetland excavation is at 100% Parking lot is completed and RWHS design is finished and ready for bidding process BMPs included in this project: bioretention areas, wetlands for biofiltration, pervious pavement, rainwater harvesting.

13. LID Phase II: Cameron County Drainage District #1 13

14. LID Phase II: Public Library, Weslaco 14 The City of Weslaco’s proposal seeks to install water allocation cisterns at the public library then recycle this water for use within the landscaping needs of the library. Design is completed and the project is currently open for bids. The system was installed by June 2013.

15. LID Phase II: New Fire Station, Alton 15 The new fire station will have a permeable paver driveway designed for heavy load applications Construction started in March 2013 The proposals received for this project were 30% lower than what was initially estimated. A total of $56,000 are available to implement other projects.

16. LID Phase II Amendment: South Texas College 16 Approved by TCEQ and EPA as an amendment to the LID II contract. Focus on water quality monitoring and BMP performance evaluation

17. LID Phase II Amendment: South Texas College

18. 18 LID Phase III: City of Alamo

19. 19 LID Phase III: City of Alamo

20. Load Reductions Site Nitrogen (lbs/yr) Phosphorus (lbs/yr) BOD (lbs/yr) Sediment (lb/yr) E. coli (MPN/yr) Cascade Park0.61.1278461 1.01x10 11 South Texas College ND 5735581.80x10 9 City of Alton*2.140.77N.D89.0ND Weslaco LibraryND 238ND Site Nitrogen (lbs/yr) Phosphorus (lbs/yr) BOD (lbs/yr) Sediment (lb/yr) E. coli (MPN/yr) Valley Nature Center 1.871.472186,723.61 ND City of La FeriaND 4.3448.052.89x10 9 City of Brownsville ND 3.78667.008.01x10 9 City of San Juan*7.322.21ND67.103.7x10 9

21. Monitoring Data (BOD)

22. Monitoring Data (TSS)

23. Hydraulic Load Reductions

24. BMP Cost BMP LocationsType of BMPCharacteristics* Cost COB Monte Bella Park Pervious parking lot Drainage Area 1280 sq ft 2442 sqft (impervious; control) $ 123,479 Pervious walking trails Drainage Area 200 sq ft $ 13,092 Bioswale60 linear ft $ 17,140 Rain Harvesting System5,000 gal $ 11,765 COSJ Amigos del Valle Center Rainwater collection systemTwo 5,000 gal cistern $ 17,300 Green Roof 2,000 sq ft with irrigation system $ 60,235 Rain Garden254 sq ft $ 6,654 Linear bioswale85 linear feet $ 14,639 Valley Nature Center Rainwater collection systemTwo 5,000 gal cisterns $ 15,850 Green Roof200 sq ft with irrigation system $ 61,275 Pervious walking trails4,000 sq ft $ 27,233 Pervious service road2,800 sq ft $ 68,083 Wetland0.5 Ac $ 47,658 COLF Recreation Center Pervious parking lot Drainage area 2,250 sqft (pervious) 2,250 sq ft (impervious; control) $ 209,482

25. BMP Cost BMP LocationsType of BMPCharacteristics Cost CCDD#1 Cascade Park Rainwater collection system One 10,000 gal cistern $ 14,441 Wetland10 ac $ 173,908 Pervious Parking Lot17,000 sq ft $ 78,838 Bioswale20 ft $ 23,188 COA Fire StationPervious Pavement12,000 sq ft $ 95,369 COW Public Library Rainwater collection system One 10,000 gal $ 25,750 STCBioswale250 ft $ 31,733*